Bump grpc-go to 1.30.0 (#168 )

* Bump grpc-go to 1.30.0 * Import new xds package instead of experimental Co-authored-by: Erik Johansson <ejohansson@spotify.com>
update travis badge and link
2026-05-25 21:21:46 +03:00 · 2020-07-13 13:16:48 -04:00 · 2020-07-09 20:53:23 -04:00 · 2020-06-01 18:56:18 -04:00 · 2020-05-15 11:40:32 -04:00 · 2020-05-15 08:21:08 -04:00
21 changed files with 1622 additions and 125 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 dist/
+VERSION
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -11,14 +11,14 @@ builds:
    ldflags:
      - -s -w -X main.version=v{{.Version}}

-archive:
-  format: tar.gz
-  format_overrides:
-    - goos: windows
-      format: zip
-  replacements:
-    amd64: x86_64
-    386: x86_32
-    darwin: osx
-  files:
-    - LICENSE
+archives:
+  - format: tar.gz
+    format_overrides:
+      - goos: windows
+        format: zip
+    replacements:
+      amd64: x86_64
+      386: x86_32
+      darwin: osx
+    files:
+      - LICENSE
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,15 +3,22 @@ sudo: false

 matrix:
  include:
-    - go: "1.9"
-    - go: "1.10"
-      env: VET=1
-    - go: "1.11"
+    - go: 1.11.x
      env: GO111MODULE=off
-    - go: "1.11"
+    - go: 1.11.x
+      env: GO111MODULE=on
+    - go: 1.12.x
+      env: GO111MODULE=off
+    - go: 1.12.x
+      env: GO111MODULE=on
+    - go: 1.13.x
+      env:
+      - GO111MODULE=on
+      - VET=1
+    - go: 1.14.x
      env: GO111MODULE=on
-    - go: "1.12"
    - go: tip
+      env: GO111MODULE=on

 script:
-  - if [[ "$VET" = 1 ]]; then make; else make deps test; fi
+  - if [[ "$VET" = 1 ]]; then make ci; else make deps test; fi
--- a/29
+++ b/29
@@ -0,0 +1,29 @@
+FROM golang:1.13-alpine as builder
+MAINTAINER FullStory Engineering
+
+# create non-privileged group and user
+RUN addgroup -S grpcurl && adduser -S grpcurl -G grpcurl
+
+WORKDIR /tmp/fullstorydev/grpcurl
+# copy just the files/sources we need to build grpcurl
+COPY VERSION *.go go.* /tmp/fullstorydev/grpcurl/
+COPY cmd /tmp/fullstorydev/grpcurl/cmd
+# and build a completely static binary (so we can use
+# scratch as basis for the final image)
+ENV CGO_ENABLED=0
+ENV GOOS=linux
+ENV GOARCH=amd64
+ENV GO111MODULE=on
+RUN go build -o /grpcurl \
+    -ldflags "-w -extldflags \"-static\" -X \"main.version=$(cat VERSION)\"" \
+    ./cmd/grpcurl
+
+# New FROM so we have a nice'n'tiny image
+FROM scratch
+WORKDIR /
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=builder /etc/passwd /etc/passwd
+COPY --from=builder /grpcurl /bin/grpcurl
+USER grpcurl
+
+ENTRYPOINT ["/bin/grpcurl"]
--- a/23
+++ b/23
@@ -6,7 +6,7 @@ dev_build_version=$(shell git describe --tags --always --dirty)
 # they are just too noisy to be a requirement for a CI -- we don't even *want*
 # to fix some of the things they consider to be violations.
 .PHONY: ci
-ci: deps checkgofmt vet staticcheck unused ineffassign predeclared test
+ci: deps checkgofmt vet staticcheck ineffassign predeclared test

 .PHONY: deps
 deps:
@@ -22,9 +22,15 @@ install:

 .PHONY: release
 release:
-	@GO111MODULE=off go get github.com/goreleaser/goreleaser
+	@go get github.com/goreleaser/goreleaser
 	goreleaser --rm-dist

+.PHONY: docker
+docker:
+	@echo $(dev_build_version) > VERSION
+	docker build -t fullstorydev/grpcurl:$(dev_build_version) .
+	@rm VERSION
+
 .PHONY: checkgofmt
 checkgofmt:
 	gofmt -s -l .
@@ -36,23 +42,12 @@ checkgofmt:
 vet:
 	go vet ./...

-# TODO: remove the ignored check; need it for now because it
-# is complaining about a deprecated comment added to grpc,
-# but it's not yet released. Once the new (non-deprecated)
-# API is included in a release, we can move to that new
-# version and fix the call site to no longer use deprecated
-# method.
 # This all works fine with Go modules, but without modules,
 # CI is just getting latest master for dependencies like grpc.
 .PHONY: staticcheck
 staticcheck:
 	@go get honnef.co/go/tools/cmd/staticcheck
-	staticcheck -ignore github.com/fullstorydev/grpcurl/tls_settings_test.go:SA1019 ./...
-
-.PHONY: unused
-unused:
-	@go get honnef.co/go/tools/cmd/unused
-	unused ./...
+	staticcheck ./...

 .PHONY: ineffassign
 ineffassign:
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # gRPCurl
-[![Build Status](https://travis-ci.org/fullstorydev/grpcurl.svg?branch=master)](https://travis-ci.org/fullstorydev/grpcurl/branches)
+[![Build Status](https://travis-ci.com/fullstorydev/grpcurl.svg?branch=master)](https://travis-ci.com/github/fullstorydev/grpcurl/branches)
 [![Go Report Card](https://goreportcard.com/badge/github.com/fullstorydev/grpcurl)](https://goreportcard.com/report/github.com/fullstorydev/grpcurl)

 `grpcurl` is a command-line tool that lets you interact with gRPC servers. It's
--- a/cmd/grpcurl/grpcurl.go
+++ b/cmd/grpcurl/grpcurl.go
@@ -8,6 +8,8 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"path/filepath"
+	"strconv"
 	"strings"
 	"time"

@@ -22,8 +24,17 @@ import (
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/metadata"
 	reflectpb "google.golang.org/grpc/reflection/grpc_reflection_v1alpha"
+	"google.golang.org/grpc/status"
+
+	// Register gzip compressor so compressed responses will work:
+	_ "google.golang.org/grpc/encoding/gzip"
 )

+// To avoid confusion between program error codes and the gRPC resonse
+// status codes 'Cancelled' and 'Unknown', 1 and 2 respectively,
+// the response status codes emitted use an offest of 64
+const statusCodeOffset = 64
+
 var version = "dev build <no version set>"

 var (
@@ -51,15 +62,27 @@ var (
 	key = flags.String("key", "", prettify(`
 		File containing client private key, to present to the server. Not valid
 		with -plaintext option. Must also provide -cert option.`))
-	protoset    multiString
-	protoFiles  multiString
-	importPaths multiString
-	addlHeaders multiString
-	rpcHeaders  multiString
-	reflHeaders multiString
-	authority   = flags.String("authority", "", prettify(`
-		Value of :authority pseudo-header to be use with underlying HTTP/2
-		requests. It defaults to the given address.`))
+	protoset      multiString
+	protoFiles    multiString
+	importPaths   multiString
+	addlHeaders   multiString
+	rpcHeaders    multiString
+	reflHeaders   multiString
+	expandHeaders = flags.Bool("expand-headers", false, prettify(`
+		If set, headers may use '${NAME}' syntax to reference environment
+		variables. These will be expanded to the actual environment variable
+		value before sending to the server. For example, if there is an
+		environment variable defined like FOO=bar, then a header of
+		'key: ${FOO}' would expand to 'key: bar'. This applies to -H,
+		-rpc-header, and -reflect-header options. No other expansion/escaping is
+		performed. This can be used to supply credentials/secrets without having
+		to put them in command-line arguments.`))
+	authority = flags.String("authority", "", prettify(`
+		The authoritative name of the remote server. This value is passed as the
+		value of the ":authority" pseudo-header in the HTTP/2 protocol. When TLS
+		is used, this will also be used as the server name when verifying the
+		server's certificate. It defaults to the address that is provided in the
+		positional arguments.`))
 	data = flags.String("d", "", prettify(`
 		Data for request contents. If the value is '@' then the request contents
 		are read from stdin. For calls that accept a stream of requests, the
@@ -78,6 +101,9 @@ var (
 	connectTimeout = flags.Float64("connect-timeout", 0, prettify(`
 		The maximum time, in seconds, to wait for connection to be established.
 		Defaults to 10 seconds.`))
+	formatError = flags.Bool("format-error", false, prettify(`
+		When a non-zero status is returned, format the response using the
+		value set by the -format flag .`))
 	keepaliveTime = flags.Float64("keepalive-time", 0, prettify(`
 		If present, the maximum idle time in seconds, after which a keepalive
 		probe is sent. If the connection remains idle and no keepalive response
@@ -92,12 +118,25 @@ var (
 		will accept. If not specified, defaults to 4,194,304 (4 megabytes).`))
 	emitDefaults = flags.Bool("emit-defaults", false, prettify(`
 		Emit default values for JSON-encoded responses.`))
+	protosetOut = flags.String("protoset-out", "", prettify(`
+		The name of a file to be written that will contain a FileDescriptorSet
+		proto. With the list and describe verbs, the listed or described
+		elements and their transitive dependencies will be written to the named
+		file if this option is given. When invoking an RPC and this option is
+		given, the method being invoked and its transitive dependencies will be
+		included in the output file.`))
 	msgTemplate = flags.Bool("msg-template", false, prettify(`
 		When describing messages, show a template of input data.`))
 	verbose = flags.Bool("v", false, prettify(`
 		Enable verbose output.`))
 	serverName = flags.String("servername", "", prettify(`
-		Override server name when validating TLS certificate.`))
+		Override server name when validating TLS certificate. This flag is
+		ignored if -plaintext or -insecure is used.
+		NOTE: Prefer -authority. This flag may be removed in the future. It is
+		an error to use both -authority and -servername (though this will be
+		permitted if they are both set to the same value, to increase backwards
+		compatibility with earlier releases that allowed both to be set).`))
+	reflection = optionalBoolFlag{val: true}
 )

 func init() {
@@ -140,6 +179,12 @@ func init() {
 		order given. If no import paths are given, all files (including all
 		imports) must be provided as -proto flags, and grpcurl will attempt to
 		resolve all import statements from the set of file names given.`))
+	flags.Var(&reflection, "use-reflection", prettify(`
+		When true, server reflection will be used to determine the RPC schema.
+		Defaults to true unless a -proto or -protoset option is provided. If
+		-use-reflection is used in combination with a -proto or -protoset flag,
+		the provided descriptor sources will be used in addition to server
+		reflection to resolve messages and extensions.`))
 }

 type multiString []string
@@ -153,6 +198,49 @@ func (s *multiString) Set(value string) error {
 	return nil
 }

+// Uses a file source as a fallback for resolving symbols and extensions, but
+// only uses the reflection source for listing services
+type compositeSource struct {
+	reflection grpcurl.DescriptorSource
+	file       grpcurl.DescriptorSource
+}
+
+func (cs compositeSource) ListServices() ([]string, error) {
+	return cs.reflection.ListServices()
+}
+
+func (cs compositeSource) FindSymbol(fullyQualifiedName string) (desc.Descriptor, error) {
+	d, err := cs.reflection.FindSymbol(fullyQualifiedName)
+	if err == nil {
+		return d, nil
+	}
+	return cs.file.FindSymbol(fullyQualifiedName)
+}
+
+func (cs compositeSource) AllExtensionsForType(typeName string) ([]*desc.FieldDescriptor, error) {
+	exts, err := cs.reflection.AllExtensionsForType(typeName)
+	if err != nil {
+		// On error fall back to file source
+		return cs.file.AllExtensionsForType(typeName)
+	}
+	// Track the tag numbers from the reflection source
+	tags := make(map[int32]bool)
+	for _, ext := range exts {
+		tags[ext.GetNumber()] = true
+	}
+	fileExts, err := cs.file.AllExtensionsForType(typeName)
+	if err != nil {
+		return exts, nil
+	}
+	for _, ext := range fileExts {
+		// Prioritize extensions found via reflection
+		if !tags[ext.GetNumber()] {
+			exts = append(exts, ext)
+		}
+	}
+	return exts, nil
+}
+
 func main() {
 	flags.Usage = usage
 	flags.Parse(os.Args[1:])
@@ -161,7 +249,7 @@ func main() {
 		os.Exit(0)
 	}
 	if *printVersion {
-		fmt.Fprintf(os.Stderr, "%s %s\n", os.Args[0], version)
+		fmt.Fprintf(os.Stderr, "%s %s\n", filepath.Base(os.Args[0]), version)
 		os.Exit(0)
 	}

@@ -191,7 +279,7 @@ func main() {
 		fail(nil, "The -cert and -key arguments must be used together and both be present.")
 	}
 	if *format != "json" && *format != "text" {
-		fail(nil, "The -format option must be 'json' or 'text.")
+		fail(nil, "The -format option must be 'json' or 'text'.")
 	}
 	if *emitDefaults && *format != "json" {
 		warn("The -emit-defaults is only used when using json format.")
@@ -260,6 +348,14 @@ func main() {
 	if len(importPaths) > 0 && len(protoFiles) == 0 {
 		warn("The -import-path argument is not used unless -proto files are used.")
 	}
+	if !reflection.val && len(protoset) == 0 && len(protoFiles) == 0 {
+		fail(nil, "No protoset files or proto files specified and -use-reflection set to false.")
+	}
+
+	// Protoset or protofiles provided and -use-reflection unset
+	if !reflection.set && (len(protoset) > 0 || len(protoFiles) > 0) {
+		reflection.val = false
+	}

 	ctx := context.Background()
 	if *maxTime > 0 {
@@ -285,9 +381,6 @@ func main() {
 		if *maxMsgSz > 0 {
 			opts = append(opts, grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(*maxMsgSz)))
 		}
-		if *authority != "" {
-			opts = append(opts, grpc.WithAuthority(*authority))
-		}
 		var creds credentials.TransportCredentials
 		if !*plaintext {
 			var err error
@@ -295,11 +388,27 @@ func main() {
 			if err != nil {
 				fail(err, "Failed to configure transport credentials")
 			}
-			if *serverName != "" {
-				if err := creds.OverrideServerName(*serverName); err != nil {
-					fail(err, "Failed to override server name as %q", *serverName)
+
+			// can use either -servername or -authority; but not both
+			if *serverName != "" && *authority != "" {
+				if *serverName == *authority {
+					warn("Both -servername and -authority are present; prefer only -authority.")
+				} else {
+					fail(nil, "Cannot specify different values for -servername and -authority.")
 				}
 			}
+			overrideName := *serverName
+			if overrideName == "" {
+				overrideName = *authority
+			}
+
+			if overrideName != "" {
+				if err := creds.OverrideServerName(overrideName); err != nil {
+					fail(err, "Failed to override server name as %q", overrideName)
+				}
+			}
+		} else if *authority != "" {
+			opts = append(opts, grpc.WithAuthority(*authority))
 		}
 		network := "tcp"
 		if isUnixSocket != nil && isUnixSocket() {
@@ -311,28 +420,60 @@ func main() {
 		}
 		return cc
 	}
+	printFormattedStatus := func(w io.Writer, stat *status.Status, formatter grpcurl.Formatter) {
+		formattedStatus, err := formatter(stat.Proto())
+		if err != nil {
+			fmt.Fprintf(w, "ERROR: %v", err.Error())
+		}
+		fmt.Fprint(w, formattedStatus)
+	}
+
+	if *expandHeaders {
+		var err error
+		addlHeaders, err = grpcurl.ExpandHeaders(addlHeaders)
+		if err != nil {
+			fail(err, "Failed to expand additional headers")
+		}
+		rpcHeaders, err = grpcurl.ExpandHeaders(rpcHeaders)
+		if err != nil {
+			fail(err, "Failed to expand rpc headers")
+		}
+		reflHeaders, err = grpcurl.ExpandHeaders(reflHeaders)
+		if err != nil {
+			fail(err, "Failed to expand reflection headers")
+		}
+	}

 	var cc *grpc.ClientConn
 	var descSource grpcurl.DescriptorSource
 	var refClient *grpcreflect.Client
+	var fileSource grpcurl.DescriptorSource
 	if len(protoset) > 0 {
 		var err error
-		descSource, err = grpcurl.DescriptorSourceFromProtoSets(protoset...)
+		fileSource, err = grpcurl.DescriptorSourceFromProtoSets(protoset...)
 		if err != nil {
 			fail(err, "Failed to process proto descriptor sets.")
 		}
 	} else if len(protoFiles) > 0 {
 		var err error
-		descSource, err = grpcurl.DescriptorSourceFromProtoFiles(importPaths, protoFiles...)
+		fileSource, err = grpcurl.DescriptorSourceFromProtoFiles(importPaths, protoFiles...)
 		if err != nil {
 			fail(err, "Failed to process proto source files.")
 		}
-	} else {
+	}
+	if reflection.val {
 		md := grpcurl.MetadataFromHeaders(append(addlHeaders, reflHeaders...))
 		refCtx := metadata.NewOutgoingContext(ctx, md)
 		cc = dial()
 		refClient = grpcreflect.NewClient(refCtx, reflectpb.NewServerReflectionClient(cc))
-		descSource = grpcurl.DescriptorSourceFromServer(ctx, refClient)
+		reflSource := grpcurl.DescriptorSourceFromServer(ctx, refClient)
+		if fileSource != nil {
+			descSource = compositeSource{reflSource, fileSource}
+		} else {
+			descSource = reflSource
+		}
+	} else {
+		descSource = fileSource
 	}

 	// arrange for the RPCs to be cleanly shutdown
@@ -366,6 +507,9 @@ func main() {
 					fmt.Printf("%s\n", svc)
 				}
 			}
+			if err := writeProtoset(descSource, svcs...); err != nil {
+				fail(err, "Failed to write protoset to %s", *protosetOut)
+			}
 		} else {
 			methods, err := grpcurl.ListMethods(descSource, symbol)
 			if err != nil {
@@ -378,6 +522,9 @@ func main() {
 					fmt.Printf("%s\n", m)
 				}
 			}
+			if err := writeProtoset(descSource, symbol); err != nil {
+				fail(err, "Failed to write protoset to %s", *protosetOut)
+			}
 		}

 	} else if describe {
@@ -478,6 +625,9 @@ func main() {
 				fmt.Println(str)
 			}
 		}
+		if err := writeProtoset(descSource, symbols...); err != nil {
+			fail(err, "Failed to write protoset to %s", *protosetOut)
+		}

 	} else {
 		// Invoke an RPC
@@ -518,8 +668,12 @@ func main() {
 			fmt.Printf("Sent %d request%s and received %d response%s\n", reqCount, reqSuffix, h.NumResponses, respSuffix)
 		}
 		if h.Status.Code() != codes.OK {
-			fmt.Fprintf(os.Stderr, "ERROR:\n  Code: %s\n  Message: %s\n", h.Status.Code().String(), h.Status.Message())
-			exit(1)
+			if *formatError {
+				printFormattedStatus(os.Stderr, h.Status, formatter)
+			} else {
+				grpcurl.PrintStatus(os.Stderr, h.Status, formatter)
+			}
+			exit(statusCodeOffset + int(h.Status.Code()))
 		}
 	}
 }
@@ -594,3 +748,40 @@ func fail(err error, msg string, args ...interface{}) {
 		exit(2)
 	}
 }
+
+func writeProtoset(descSource grpcurl.DescriptorSource, symbols ...string) error {
+	if *protosetOut == "" {
+		return nil
+	}
+	f, err := os.Create(*protosetOut)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return grpcurl.WriteProtoset(f, descSource, symbols...)
+}
+
+type optionalBoolFlag struct {
+	set, val bool
+}
+
+func (f *optionalBoolFlag) String() string {
+	if !f.set {
+		return "unset"
+	}
+	return strconv.FormatBool(f.val)
+}
+
+func (f *optionalBoolFlag) Set(s string) error {
+	v, err := strconv.ParseBool(s)
+	if err != nil {
+		return err
+	}
+	f.set = true
+	f.val = v
+	return nil
+}
+
+func (f *optionalBoolFlag) IsBoolFlag() bool {
+	return true
+}
--- a/desc_source.go
+++ b/desc_source.go
@@ -3,6 +3,7 @@ package grpcurl
 import (
 	"errors"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"sync"

@@ -58,9 +59,14 @@ func DescriptorSourceFromProtoSets(fileNames ...string) (DescriptorSource, error
 // whose contents are Protocol Buffer source files. The given importPaths are used to locate
 // any imported files.
 func DescriptorSourceFromProtoFiles(importPaths []string, fileNames ...string) (DescriptorSource, error) {
+	fileNames, err := protoparse.ResolveFilenames(importPaths, fileNames...)
+	if err != nil {
+		return nil, err
+	}
 	p := protoparse.Parser{
-		ImportPaths:      importPaths,
-		InferImportPaths: len(importPaths) == 0,
+		ImportPaths:           importPaths,
+		InferImportPaths:      len(importPaths) == 0,
+		IncludeSourceCodeInfo: true,
 	}
 	fds, err := p.ParseFiles(fileNames...)
 	if err != nil {
@@ -109,7 +115,7 @@ func resolveFileDescriptor(unresolved map[string]*descpb.FileDescriptorProto, re
 	return result, nil
 }

-// DescriptorSourceFromFileDescriptorSet creates a DescriptorSource that is backed by the given
+// DescriptorSourceFromFileDescriptors creates a DescriptorSource that is backed by the given
 // file descriptors
 func DescriptorSourceFromFileDescriptors(files ...*desc.FileDescriptor) (DescriptorSource, error) {
 	fds := map[string]*desc.FileDescriptor{}
@@ -246,3 +252,53 @@ func reflectionSupport(err error) error {
 	}
 	return err
 }
+
+// WriteProtoset will use the given descriptor source to resolve all of the given
+// symbols and write a proto file descriptor set with their definitions to the
+// given output. The output will include descriptors for all files in which the
+// symbols are defined as well as their transitive dependencies.
+func WriteProtoset(out io.Writer, descSource DescriptorSource, symbols ...string) error {
+	// compute set of file descriptors
+	filenames := make([]string, 0, len(symbols))
+	fds := make(map[string]*desc.FileDescriptor, len(symbols))
+	for _, sym := range symbols {
+		d, err := descSource.FindSymbol(sym)
+		if err != nil {
+			return fmt.Errorf("failed to find descriptor for %q: %v", sym, err)
+		}
+		fd := d.GetFile()
+		if _, ok := fds[fd.GetName()]; !ok {
+			fds[fd.GetName()] = fd
+			filenames = append(filenames, fd.GetName())
+		}
+	}
+	// now expand that to include transitive dependencies in topologically sorted
+	// order (such that file always appears after its dependencies)
+	expandedFiles := make(map[string]struct{}, len(fds))
+	allFilesSlice := make([]*descpb.FileDescriptorProto, 0, len(fds))
+	for _, filename := range filenames {
+		allFilesSlice = addFilesToSet(allFilesSlice, expandedFiles, fds[filename])
+	}
+	// now we can serialize to file
+	b, err := proto.Marshal(&descpb.FileDescriptorSet{File: allFilesSlice})
+	if err != nil {
+		return fmt.Errorf("failed to serialize file descriptor set: %v", err)
+	}
+	if _, err := out.Write(b); err != nil {
+		return fmt.Errorf("failed to write file descriptor set: %v", err)
+	}
+	return nil
+}
+
+func addFilesToSet(allFiles []*descpb.FileDescriptorProto, expanded map[string]struct{}, fd *desc.FileDescriptor) []*descpb.FileDescriptorProto {
+	if _, ok := expanded[fd.GetName()]; ok {
+		// already seen this one
+		return allFiles
+	}
+	expanded[fd.GetName()] = struct{}{}
+	// add all dependencies first
+	for _, dep := range fd.GetDependencies() {
+		allFiles = addFilesToSet(allFiles, expanded, dep)
+	}
+	return append(allFiles, fd.AsFileDescriptorProto())
+}
--- a/desc_source_test.go
+++ b/desc_source_test.go
@@ -0,0 +1,62 @@
+package grpcurl
+
+import (
+	"bytes"
+	"io/ioutil"
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/protoc-gen-go/descriptor"
+)
+
+func TestWriteProtoset(t *testing.T) {
+	exampleProtoset, err := loadProtoset("./testing/example.protoset")
+	if err != nil {
+		t.Fatalf("failed to load example.protoset: %v", err)
+	}
+	testProtoset, err := loadProtoset("./testing/test.protoset")
+	if err != nil {
+		t.Fatalf("failed to load test.protoset: %v", err)
+	}
+
+	mergedProtoset := &descriptor.FileDescriptorSet{
+		File: append(exampleProtoset.File, testProtoset.File...),
+	}
+
+	descSrc, err := DescriptorSourceFromFileDescriptorSet(mergedProtoset)
+	if err != nil {
+		t.Fatalf("failed to create descriptor source: %v", err)
+	}
+
+	checkWriteProtoset(t, descSrc, exampleProtoset, "TestService")
+	checkWriteProtoset(t, descSrc, testProtoset, "grpc.testing.TestService")
+	checkWriteProtoset(t, descSrc, mergedProtoset, "TestService", "grpc.testing.TestService")
+}
+
+func loadProtoset(path string) (*descriptor.FileDescriptorSet, error) {
+	b, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	var protoset descriptor.FileDescriptorSet
+	if err := proto.Unmarshal(b, &protoset); err != nil {
+		return nil, err
+	}
+	return &protoset, nil
+}
+
+func checkWriteProtoset(t *testing.T, descSrc DescriptorSource, protoset *descriptor.FileDescriptorSet, symbols ...string) {
+	var buf bytes.Buffer
+	if err := WriteProtoset(&buf, descSrc, symbols...); err != nil {
+		t.Fatalf("failed to write protoset: %v", err)
+	}
+
+	var result descriptor.FileDescriptorSet
+	if err := proto.Unmarshal(buf.Bytes(), &result); err != nil {
+		t.Fatalf("failed to unmarshal written protoset: %v", err)
+	}
+
+	if !proto.Equal(protoset, &result) {
+		t.Fatalf("written protoset not equal to input:\nExpecting: %s\nActual: %s", protoset, &result)
+	}
+}
--- a/format.go
+++ b/format.go
@@ -3,14 +3,19 @@ package grpcurl
 import (
 	"bufio"
 	"bytes"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"io"
+	"reflect"
+	"strings"
+	"sync"

 	"github.com/golang/protobuf/jsonpb"
 	"github.com/golang/protobuf/proto"
 	"github.com/jhump/protoreflect/desc"
 	"github.com/jhump/protoreflect/dynamic"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 )
@@ -64,7 +69,7 @@ func (f *jsonRequestParser) NumRequests() int {
 }

 const (
-	textSeparatorChar = 0x1e
+	textSeparatorChar = '\x1e'
 )

 type textRequestParser struct {
@@ -142,6 +147,8 @@ type textFormatter struct {
 	numFormatted int
 }

+var protoTextMarshaler = proto.TextMarshaler{ExpandAny: true}
+
 func (tf *textFormatter) format(m proto.Message) (string, error) {
 	var buf bytes.Buffer
 	if tf.useSeparator && tf.numFormatted > 0 {
@@ -166,13 +173,13 @@ func (tf *textFormatter) format(m proto.Message) (string, error) {
 		if _, err := buf.Write(b); err != nil {
 			return "", err
 		}
-	} else if err := proto.MarshalText(&buf, m); err != nil {
+	} else if err := protoTextMarshaler.Marshal(&buf, m); err != nil {
 		return "", err
 	}

 	// no trailing newline needed
 	str := buf.String()
-	if str[len(str)-1] == '\n' {
+	if len(str) > 0 && str[len(str)-1] == '\n' {
 		str = str[:len(str)-1]
 	}

@@ -188,24 +195,153 @@ const (
 	FormatText = Format("text")
 )

-func anyResolver(source DescriptorSource) (jsonpb.AnyResolver, error) {
-	// TODO: instead of pro-actively downloading file descriptors to
-	// build a dynamic resolver, it would be better if the resolver
-	// impl was lazy, and simply downloaded the descriptors as needed
-	// when asked to resolve a particular type URL
-
-	// best effort: build resolver with whatever files we can
-	// load, ignoring any errors
-	files, _ := GetAllFiles(source)
-
-	var er dynamic.ExtensionRegistry
-	for _, fd := range files {
-		er.AddExtensionsFromFile(fd)
-	}
-	mf := dynamic.NewMessageFactoryWithExtensionRegistry(&er)
-	return dynamic.AnyResolver(mf, files...), nil
+// AnyResolverFromDescriptorSource returns an AnyResolver that will search for
+// types using the given descriptor source.
+func AnyResolverFromDescriptorSource(source DescriptorSource) jsonpb.AnyResolver {
+	return &anyResolver{source: source}
 }

+// AnyResolverFromDescriptorSourceWithFallback returns an AnyResolver that will
+// search for types using the given descriptor source and then fallback to a
+// special message if the type is not found. The fallback type will render to
+// JSON with a "@type" property, just like an Any message, but also with a
+// custom "@value" property that includes the binary encoded payload.
+func AnyResolverFromDescriptorSourceWithFallback(source DescriptorSource) jsonpb.AnyResolver {
+	res := anyResolver{source: source}
+	return &anyResolverWithFallback{AnyResolver: &res}
+}
+
+type anyResolver struct {
+	source DescriptorSource
+
+	er dynamic.ExtensionRegistry
+
+	mu       sync.RWMutex
+	mf       *dynamic.MessageFactory
+	resolved map[string]func() proto.Message
+}
+
+func (r *anyResolver) Resolve(typeUrl string) (proto.Message, error) {
+	mname := typeUrl
+	if slash := strings.LastIndex(mname, "/"); slash >= 0 {
+		mname = mname[slash+1:]
+	}
+
+	r.mu.RLock()
+	factory := r.resolved[mname]
+	r.mu.RUnlock()
+
+	// already resolved?
+	if factory != nil {
+		return factory(), nil
+	}
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	// double-check, in case we were racing with another goroutine
+	// that resolved this one
+	factory = r.resolved[mname]
+	if factory != nil {
+		return factory(), nil
+	}
+
+	// use descriptor source to resolve message type
+	d, err := r.source.FindSymbol(mname)
+	if err != nil {
+		return nil, err
+	}
+	md, ok := d.(*desc.MessageDescriptor)
+	if !ok {
+		return nil, fmt.Errorf("unknown message: %s", typeUrl)
+	}
+	// populate any extensions for this message, too
+	if exts, err := r.source.AllExtensionsForType(mname); err != nil {
+		return nil, err
+	} else if err := r.er.AddExtension(exts...); err != nil {
+		return nil, err
+	}
+
+	if r.mf == nil {
+		r.mf = dynamic.NewMessageFactoryWithExtensionRegistry(&r.er)
+	}
+
+	factory = func() proto.Message {
+		return r.mf.NewMessage(md)
+	}
+	if r.resolved == nil {
+		r.resolved = map[string]func() proto.Message{}
+	}
+	r.resolved[mname] = factory
+	return factory(), nil
+}
+
+// anyResolverWithFallback can provide a fallback value for unknown
+// messages that will format itself to JSON using an "@value" field
+// that has the base64-encoded data for the unknown message value.
+type anyResolverWithFallback struct {
+	jsonpb.AnyResolver
+}
+
+func (r anyResolverWithFallback) Resolve(typeUrl string) (proto.Message, error) {
+	msg, err := r.AnyResolver.Resolve(typeUrl)
+	if err == nil {
+		return msg, err
+	}
+
+	// Try "default" resolution logic. This mirrors the default behavior
+	// of jsonpb, which checks to see if the given message name is registered
+	// in the proto package.
+	mname := typeUrl
+	if slash := strings.LastIndex(mname, "/"); slash >= 0 {
+		mname = mname[slash+1:]
+	}
+	mt := proto.MessageType(mname)
+	if mt != nil {
+		return reflect.New(mt.Elem()).Interface().(proto.Message), nil
+	}
+
+	// finally, fallback to a special placeholder that can marshal itself
+	// to JSON using a special "@value" property to show base64-encoded
+	// data for the embedded message
+	return &unknownAny{TypeUrl: typeUrl, Error: fmt.Sprintf("%s is not recognized; see @value for raw binary message data", mname)}, nil
+}
+
+type unknownAny struct {
+	TypeUrl string `json:"@type"`
+	Error   string `json:"@error"`
+	Value   string `json:"@value"`
+}
+
+func (a *unknownAny) MarshalJSONPB(jsm *jsonpb.Marshaler) ([]byte, error) {
+	if jsm.Indent != "" {
+		return json.MarshalIndent(a, "", jsm.Indent)
+	}
+	return json.Marshal(a)
+}
+
+func (a *unknownAny) Unmarshal(b []byte) error {
+	a.Value = base64.StdEncoding.EncodeToString(b)
+	return nil
+}
+
+func (a *unknownAny) Reset() {
+	a.Value = ""
+}
+
+func (a *unknownAny) String() string {
+	b, err := a.MarshalJSONPB(&jsonpb.Marshaler{})
+	if err != nil {
+		return fmt.Sprintf("ERROR: %v", err.Error())
+	}
+	return string(b)
+}
+
+func (a *unknownAny) ProtoMessage() {
+}
+
+var _ proto.Message = (*unknownAny)(nil)
+
 // RequestParserAndFormatterFor returns a request parser and formatter for the
 // given format. The given descriptor source may be used for parsing message
 // data (if needed by the format). The flags emitJSONDefaultFields and
@@ -214,11 +350,8 @@ func anyResolver(source DescriptorSource) (jsonpb.AnyResolver, error) {
 func RequestParserAndFormatterFor(format Format, descSource DescriptorSource, emitJSONDefaultFields, includeTextSeparator bool, in io.Reader) (RequestParser, Formatter, error) {
 	switch format {
 	case FormatJSON:
-		resolver, err := anyResolver(descSource)
-		if err != nil {
-			return nil, nil, fmt.Errorf("error creating message resolver: %v", err)
-		}
-		return NewJSONRequestParser(in, resolver), NewJSONFormatter(emitJSONDefaultFields, resolver), nil
+		resolver := AnyResolverFromDescriptorSource(descSource)
+		return NewJSONRequestParser(in, resolver), NewJSONFormatter(emitJSONDefaultFields, anyResolverWithFallback{AnyResolver: resolver}), nil
 	case FormatText:
 		return NewTextRequestParser(in), NewTextFormatter(includeTextSeparator), nil
 	default:
@@ -295,3 +428,42 @@ func (h *DefaultEventHandler) OnReceiveTrailers(stat *status.Status, md metadata
 		fmt.Fprintf(h.out, "\nResponse trailers received:\n%s\n", MetadataToString(md))
 	}
 }
+
+// PrintStatus prints details about the given status to the given writer. The given
+// formatter is used to print any detail messages that may be included in the status.
+// If the given status has a code of OK, "OK" is printed and that is all. Otherwise,
+// "ERROR:" is printed along with a line showing the code, one showing the message
+// string, and each detail message if any are present. The detail messages will be
+// printed as proto text format or JSON, depending on the given formatter.
+func PrintStatus(w io.Writer, stat *status.Status, formatter Formatter) {
+	if stat.Code() == codes.OK {
+		fmt.Fprintln(w, "OK")
+		return
+	}
+	fmt.Fprintf(w, "ERROR:\n  Code: %s\n  Message: %s\n", stat.Code().String(), stat.Message())
+
+	statpb := stat.Proto()
+	if len(statpb.Details) > 0 {
+		fmt.Fprintf(w, "  Details:\n")
+		for i, det := range statpb.Details {
+			prefix := fmt.Sprintf("  %d)", i+1)
+			fmt.Fprintf(w, "%s\t", prefix)
+			prefix = strings.Repeat(" ", len(prefix)) + "\t"
+
+			output, err := formatter(det)
+			if err != nil {
+				fmt.Fprintf(w, "Error parsing detail message: %v\n", err)
+			} else {
+				lines := strings.Split(output, "\n")
+				for i, line := range lines {
+					if i == 0 {
+						// first line is already indented
+						fmt.Fprintf(w, "%s\n", line)
+					} else {
+						fmt.Fprintf(w, "%s%s\n", prefix, line)
+					}
+				}
+			}
+		}
+	}
+}
--- a/go.mod
+++ b/go.mod
@@ -1,8 +1,12 @@
 module github.com/fullstorydev/grpcurl

 require (
-	github.com/golang/protobuf v1.2.0
-	github.com/jhump/protoreflect v1.2.0
-	golang.org/x/net v0.0.0-20180826012351-8a410e7b638d
-	google.golang.org/grpc v1.19.0
+	github.com/golang/protobuf v1.3.5
+	github.com/gordonklaus/ineffassign v0.0.0-20200309095847-7953dde2c7bf // indirect
+	github.com/goreleaser/goreleaser v0.134.0 // indirect
+	github.com/jhump/protoreflect v1.6.1
+	github.com/nishanths/predeclared v0.0.0-20190419143655-18a43bb90ffc // indirect
+	golang.org/x/net v0.0.0-20200226121028-0de0cce0169b
+	google.golang.org/grpc v1.30.0
+	honnef.co/go/tools v0.0.1-2020.1.3 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,28 +1,456 @@
+bazil.org/fuse v0.0.0-20180421153158-65cc252bf669/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
+cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.39.0/go.mod h1:rVLT6fkc8chs9sfPtFc1SBH6em7n+ZoXaG+87tDISts=
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+google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/grpc v1.8.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
-google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.29.0 h1:2pJjwYOdkZ9HlN4sWRYBg9ttH5bCOlsueaM+b/oYjwo=
+google.golang.org/grpc v1.29.0/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
+google.golang.org/grpc v1.30.0 h1:M5a8xTlYTxwMn5ZFkwhRabsygDY5G8TYLyQDBxJNAxE=
+google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2020.1.3 h1:sXmLre5bzIR6ypkjXCDI3jHPssRhc8KD/Ome589sc3U=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+pack.ag/amqp v0.11.2/go.mod h1:4/cbmt4EJXSKlG6LCfWHoqmN0uFdy5i/+YFz+fTfhV4=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
--- a/grpcurl.go
+++ b/grpcurl.go
@@ -15,6 +15,8 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net"
+	"os"
+	"regexp"
 	"sort"
 	"strings"

@@ -30,6 +32,7 @@ import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/metadata"
+	_ "google.golang.org/grpc/xds"
 )

 // ListServices uses the given descriptor source to return a sorted list of fully-qualified
@@ -161,6 +164,36 @@ func MetadataFromHeaders(headers []string) metadata.MD {
 	return md
 }

+var envVarRegex = regexp.MustCompile(`\${\w+}`)
+
+// ExpandHeaders expands environment variables contained in the header string.
+// If no corresponding environment variable is found an error is returned.
+// TODO: Add escaping for `${`
+func ExpandHeaders(headers []string) ([]string, error) {
+	expandedHeaders := make([]string, len(headers))
+	for idx, header := range headers {
+		if header == "" {
+			continue
+		}
+		results := envVarRegex.FindAllString(header, -1)
+		if len(results) == 0 {
+			expandedHeaders[idx] = headers[idx]
+			continue
+		}
+		expandedHeader := header
+		for _, result := range results {
+			envVarName := result[2 : len(result)-1] // strip leading `${` and trailing `}`
+			envVarValue, ok := os.LookupEnv(envVarName)
+			if !ok {
+				return nil, fmt.Errorf("header %q refers to missing environment variable %q", header, envVarName)
+			}
+			expandedHeader = strings.Replace(expandedHeader, result, envVarValue, -1)
+		}
+		expandedHeaders[idx] = expandedHeader
+	}
+	return expandedHeaders, nil
+}
+
 var base64Codecs = []*base64.Encoding{base64.StdEncoding, base64.URLEncoding, base64.RawStdEncoding, base64.RawURLEncoding}

 func decode(val string) (string, error) {
@@ -573,33 +606,44 @@ func BlockingDial(ctx context.Context, network, address string, creds credential
 		}
 	}

+	// custom credentials and dialer will notify on error via the
+	// writeResult function
+	if creds != nil {
+		creds = &errSignalingCreds{
+			TransportCredentials: creds,
+			writeResult:          writeResult,
+		}
+	}
 	dialer := func(ctx context.Context, address string) (net.Conn, error) {
+		// NB: We *could* handle the TLS handshake ourselves, in the custom
+		// dialer (instead of customizing both the dialer and the credentials).
+		// But that requires using WithInsecure dial option (so that the gRPC
+		// library doesn't *also* try to do a handshake). And that would mean
+		// that the library would send the wrong ":scheme" metaheader to
+		// servers: it would send "http" instead of "https" because it is
+		// unaware that TLS is actually in use.
 		conn, err := (&net.Dialer{}).DialContext(ctx, network, address)
 		if err != nil {
 			writeResult(err)
-			return nil, err
 		}
-		if creds != nil {
-			conn, _, err = creds.ClientHandshake(ctx, address, conn)
-			if err != nil {
-				writeResult(err)
-				return nil, err
-			}
-		}
-		return conn, nil
+		return conn, err
 	}

 	// Even with grpc.FailOnNonTempDialError, this call will usually timeout in
 	// the face of TLS handshake errors. So we can't rely on grpc.WithBlock() to
 	// know when we're done. So we run it in a goroutine and then use result
-	// channel to either get the channel or fail-fast.
+	// channel to either get the connection or fail-fast.
 	go func() {
 		opts = append(opts,
 			grpc.WithBlock(),
 			grpc.FailOnNonTempDialError(true),
 			grpc.WithContextDialer(dialer),
-			grpc.WithInsecure(), // we are handling TLS, so tell grpc not to
 		)
+		if creds == nil {
+			opts = append(opts, grpc.WithInsecure())
+		} else {
+			opts = append(opts, grpc.WithTransportCredentials(creds))
+		}
 		conn, err := grpc.DialContext(ctx, address, opts...)
 		var res interface{}
 		if err != nil {
@@ -620,3 +664,18 @@ func BlockingDial(ctx context.Context, network, address string, creds credential
 		return nil, ctx.Err()
 	}
 }
+
+// errSignalingCreds is a wrapper around a TransportCredentials value, but
+// it will use the writeResult function to notify on error.
+type errSignalingCreds struct {
+	credentials.TransportCredentials
+	writeResult func(res interface{})
+}
+
+func (c *errSignalingCreds) ClientHandshake(ctx context.Context, addr string, rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
+	conn, auth, err := c.TransportCredentials.ClientHandshake(ctx, addr, rawConn)
+	if err != nil {
+		c.writeResult(err)
+	}
+	return conn, auth, err
+}
--- a/grpcurl_test.go
+++ b/grpcurl_test.go
@@ -12,7 +12,6 @@ import (
 	"time"

 	"github.com/golang/protobuf/jsonpb"
-	jsonpbtest "github.com/golang/protobuf/jsonpb/jsonpb_test_proto"
 	"github.com/golang/protobuf/proto"
 	"github.com/jhump/protoreflect/desc"
 	"github.com/jhump/protoreflect/grpcreflect"
@@ -27,6 +26,7 @@ import (

 	. "github.com/fullstorydev/grpcurl"
 	grpcurl_testing "github.com/fullstorydev/grpcurl/testing"
+	jsonpbtest "github.com/fullstorydev/grpcurl/testing/jsonpb_test_proto"
 )

 var (
@@ -245,7 +245,11 @@ func TestGetAllFiles(t *testing.T) {
 	expectedFiles := []string{"testing/test.proto"}
 	// server reflection picks up filename from linked in Go package,
 	// which indicates "grpc_testing/test.proto", not our local copy.
-	expectedFilesWithReflection := []string{"grpc_reflection_v1alpha/reflection.proto", "grpc_testing/test.proto"}
+	expectedFilesWithReflection := [][]string{
+		{"grpc_reflection_v1alpha/reflection.proto", "grpc_testing/test.proto"},
+		// depending on the version of grpc, the filenames could be prefixed with "interop/" and "reflection/"
+		{"interop/grpc_testing/test.proto", "reflection/grpc_reflection_v1alpha/reflection.proto"},
+	}

 	for _, ds := range descSources {
 		t.Run(ds.name, func(t *testing.T) {
@@ -254,11 +258,21 @@ func TestGetAllFiles(t *testing.T) {
 				t.Fatalf("failed to get all files: %v", err)
 			}
 			names := fileNames(files)
-			expected := expectedFiles
+			match := false
+			var expected []string
 			if ds.includeRefl {
-				expected = expectedFilesWithReflection
+				for _, expectedNames := range expectedFilesWithReflection {
+					expected = expectedNames
+					if reflect.DeepEqual(expected, names) {
+						match = true
+						break
+					}
+				}
+			} else {
+				expected = expectedFiles
+				match = reflect.DeepEqual(expected, names)
 			}
-			if !reflect.DeepEqual(expected, names) {
+			if !match {
 				t.Errorf("GetAllFiles returned wrong results: wanted %v, got %v", expected, names)
 			}
 		})
@@ -300,6 +314,33 @@ func TestGetAllFiles(t *testing.T) {
 	}
 }

+func TestExpandHeaders(t *testing.T) {
+	inHeaders := []string{"key1: ${value}", "key2: bar", "key3: ${woo", "key4: woo}", "key5: ${TEST}",
+		"key6: ${TEST_VAR}", "${TEST}: ${TEST_VAR}", "key8: ${EMPTY}"}
+	os.Setenv("value", "value")
+	os.Setenv("TEST", "value5")
+	os.Setenv("TEST_VAR", "value6")
+	os.Setenv("EMPTY", "")
+	expectedHeaders := map[string]bool{"key1: value": true, "key2: bar": true, "key3: ${woo": true, "key4: woo}": true,
+		"key5: value5": true, "key6: value6": true, "value5: value6": true, "key8: ": true}
+
+	outHeaders, err := ExpandHeaders(inHeaders)
+	if err != nil {
+		t.Errorf("The ExpandHeaders function generated an unexpected error %s", err)
+	}
+	for _, expandedHeader := range outHeaders {
+		if _, ok := expectedHeaders[expandedHeader]; !ok {
+			t.Errorf("The ExpandHeaders function has returned an unexpected header. Received unexpected header %s", expandedHeader)
+		}
+	}
+
+	badHeaders := []string{"key: ${DNE}"}
+	_, err = ExpandHeaders(badHeaders)
+	if err == nil {
+		t.Errorf("The ExpandHeaders function should return an error for missing environment variables %q", badHeaders)
+	}
+}
+
 func fileNames(files []*desc.FileDescriptor) []string {
 	names := make([]string, len(files))
 	for i, f := range files {
--- a/mk-test-files.sh
+++ b/mk-test-files.sh
@@ -15,6 +15,9 @@ protoc testing/example.proto \
 	--include_imports \
 	--descriptor_set_out=testing/example.protoset

+protoc testing/jsonpb_test_proto/test_objects.proto \
+	--go_out=paths=source_relative:.
+
 echo "Creating certs for TLS testing..."
 if ! hash certstrap 2>/dev/null; then
  # certstrap not found: try to install it
--- a/releasing/README.md
+++ b/releasing/README.md
@@ -0,0 +1,90 @@
+# Releases of gRPCurl
+
+This document provides instructions for building a release of `grpcurl`.
+
+The release process consists of a handful of tasks:
+1. Drop a release tag in git.
+2. Build binaries for various platforms. This is done using the local `go` tool and uses `GOOS` and `GOARCH` environment variables to cross-compile for supported platforms.
+3. Creates a release in GitHub, uploads the binaries, and creates provisional release notes (in the form of a change log).
+4. Build a docker image for the new release.
+5. Push the docker image to Docker Hub, with both a version tag and the "latest" tag.
+6. Submits a PR to update the [Homebrew](https://brew.sh/) recipe with the latest version.
+
+Most of this is automated via a script in this same directory. The main thing you will need is a GitHub personal access token, which will be used for creating the release in GitHub (so you need write access to the fullstorydev/grpcurl repo) and to open a Homebrew pull request.
+
+## Creating a new release
+
+So, to actually create a new release, just run the script in this directory.
+
+First, you need a version number for the new release, following sem-ver format: `v<Major>.<Minor>.<Patch>`. Second, you need a personal access token for GitHub.
+
+We'll use `v2.3.4` as an example version and `abcdef0123456789abcdef` as an example GitHub token:
+
+```sh
+# from the root of the repo
+GITHUB_TOKEN=abcdef0123456789abcd \
+    ./releasing/do-release.sh v2.3.4
+```
+
+Wasn't that easy! There is one last step: update the release notes in GitHub. By default, the script just records a change log of commit descriptions. Use that log (and, if necessary, drill into individual PRs included in the release) to flesh out notes in the format of the `RELEASE_NOTES.md` file _in this directory_. Then login to GitHub, go to the new release, edit the notes, and paste in the markdown you just wrote.
+
+That should be all there is to it! If things go wrong and you have to re-do part of the process, see the sections below.
+
+----
+
+### GitHub Releases
+The GitHub release is the first step performed by the `do-release.sh` script. So generally, if there is an issue with that step, you can re-try the whole script.
+
+Note, if running the script did something wrong, you may have to first login to GitHub and remove uploaded artifacts for a botched release attempt. In general, this is _very undesirable_. Releases should usually be considered immutable. Instead of removing uploaded assets and providing new ones, it is often better to remove uploaded assets (to make bad binaries no longer available) and then _release a new patch version_. (You can edit the release notes for the botched version explaining why there are no artifacts for it.)
+
+The steps to do a GitHub-only release (vs. running the entire script) are the following:
+
+```sh
+# from the root of the repo
+git tag v2.3.4
+GITHUB_TOKEN=abcdef0123456789abcdef \
+    GO111MODULE=on \
+    make release
+```
+
+The `git tag ...` step is necessary because the release target requires that the current SHA have a sem-ver tag. That's the version it will use when creating the release.
+
+This will create the release in GitHub with provisional release notes that just include a change log of commit messages. You still need to login to GitHub and revise those notes to adhere to the recommended format. (See `RELEASE_NOTES.md` in this directory.)
+
+### Docker Hub Releases
+
+To re-run only the Docker Hub release steps, we need to build an image with the right tag and then push to Docker Hub.
+
+```sh
+# from the root of the repo
+echo v2.3.4 > VERSION
+docker build -t fullstorydev/grpcurl:v2.3.4 .
+# now that we have it built, push to Docker Hub
+docker push fullstorydev/grpcurl:v2.3.4
+# push "latest" tag, too
+docker tag fullstorydev/grpcurl:v2.3.4 fullstorydev/grpcurl:latest
+docker push fullstorydev/grpcurl:latest
+```
+
+If the `docker push ...` steps fail, you may need to run `docker login`, enter your Docker Hub login credentials, and then try to push again.
+
+### Homebrew Releases
+
+The last step is to update the Homebrew recipe to use the latest version. First, we need to compute the SHA256 checksum for the source archive:
+
+```sh
+# download the source archive from GitHub
+URL=https://github.com/fullstorydev/grpcurl/archive/v2.3.4.tar.gz
+curl -L -o tmp.tgz $URL
+# and compute the SHA
+SHA="$(sha256sum < tmp.tgz | awk '{ print $1 }')"
+```
+
+To actually create the brew PR, you need your GitHub personal access token again, as well as the URL and SHA from the previous step:
+
+```sh
+HOMEBREW_GITHUB_API_TOKEN=abcdef0123456789abcdef \
+    brew bump-formula-pr --url $URL --sha256 $SHA grpcurl
+```
+
+This creates a PR to bump the formula to the new version. When this PR is merged by brew maintainers, the new version becomes available!
--- a/releasing/RELEASE_NOTES.md
+++ b/releasing/RELEASE_NOTES.md
@@ -0,0 +1,11 @@
+## Changes
+
+### Command-line tool
+
+* _In this list, describe the changes to the command-line tool._
+* _Use one bullet per change. Include both bug-fixes and improvements. Omit this section if there are no changes that impact the command-line tool._
+
+### Go package "github.com/fullstorydev/grpcurl"
+
+* _In this list, describe the changes to exported API in the main package in this repo: "github.com/fullstorydev/grpcurl". These will often be closely related to changes to the command-line tool, though not always: changes that only impact the cmd/grpcurl directory of this repo do not impact exported API._
+* _Use one bullet per change. Include both bug-fixes and improvements. Omit this section if there are no changes that impact the exported API._
--- a/releasing/do-release.sh
+++ b/releasing/do-release.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# strict mode
+set -euo pipefail
+IFS=$'\n\t'
+
+if [[ -z ${DRY_RUN:-} ]]; then
+    PREFIX=""
+else
+    PREFIX="echo"
+fi
+
+# input validation
+if [[ -z ${GITHUB_TOKEN:-} ]]; then
+    echo "GITHUB_TOKEN environment variable must be set before running." >&2
+    exit 1
+fi
+if [[ $# -ne 1 || $1 == "" ]]; then
+    echo "This program requires one argument: the version number, in 'vM.N.P' format." >&2
+    exit 1
+fi
+VERSION=$1
+
+# Change to root of the repo
+cd "$(dirname "$0")/.."
+
+# GitHub release
+
+$PREFIX git tag "$VERSION"
+# make sure GITHUB_TOKEN is exported, for the benefit of this next command
+export GITHUB_TOKEN
+GO111MODULE=on $PREFIX make release
+# if that was successful, it could have touched go.mod and go.sum, so revert those
+$PREFIX git checkout go.mod go.sum
+
+# Docker release
+
+# make sure credentials are valid for later push steps; this might
+# be interactive since this will prompt for username and password
+# if there are no valid current credentials.
+$PREFIX docker login
+echo "$VERSION" > VERSION
+$PREFIX docker build -t "fullstorydev/grpcurl:${VERSION}" .
+rm VERSION
+# push to docker hub, both the given version as a tag and for "latest" tag
+$PREFIX docker push "fullstorydev/grpcurl:${VERSION}"
+$PREFIX docker tag "fullstorydev/grpcurl:${VERSION}" fullstorydev/grpcurl:latest
+$PREFIX docker push fullstorydev/grpcurl:latest
+
+# Homebrew release
+
+URL="https://github.com/fullstorydev/grpcurl/archive/${VERSION}.tar.gz"
+curl -L -o tmp.tgz "$URL"
+SHA="$(sha256sum < tmp.tgz | awk '{ print $1 }')"
+rm tmp.tgz
+HOMEBREW_GITHUB_API_TOKEN="$GITHUB_TOKEN" $PREFIX brew bump-formula-pr --url "$URL" --sha256 "$SHA" grpcurl
--- a/testing/jsonpb_test_proto/test_objects.pb.go
+++ b/testing/jsonpb_test_proto/test_objects.pb.go
@@ -0,0 +1,215 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: testing/jsonpb_test_proto/test_objects.proto
+
+package jsonpb
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	any "github.com/golang/protobuf/ptypes/any"
+	duration "github.com/golang/protobuf/ptypes/duration"
+	_struct "github.com/golang/protobuf/ptypes/struct"
+	timestamp "github.com/golang/protobuf/ptypes/timestamp"
+	wrappers "github.com/golang/protobuf/ptypes/wrappers"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+type KnownTypes struct {
+	An                   *any.Any              `protobuf:"bytes,14,opt,name=an" json:"an,omitempty"`
+	Dur                  *duration.Duration    `protobuf:"bytes,1,opt,name=dur" json:"dur,omitempty"`
+	St                   *_struct.Struct       `protobuf:"bytes,12,opt,name=st" json:"st,omitempty"`
+	Ts                   *timestamp.Timestamp  `protobuf:"bytes,2,opt,name=ts" json:"ts,omitempty"`
+	Lv                   *_struct.ListValue    `protobuf:"bytes,15,opt,name=lv" json:"lv,omitempty"`
+	Val                  *_struct.Value        `protobuf:"bytes,16,opt,name=val" json:"val,omitempty"`
+	Dbl                  *wrappers.DoubleValue `protobuf:"bytes,3,opt,name=dbl" json:"dbl,omitempty"`
+	Flt                  *wrappers.FloatValue  `protobuf:"bytes,4,opt,name=flt" json:"flt,omitempty"`
+	I64                  *wrappers.Int64Value  `protobuf:"bytes,5,opt,name=i64" json:"i64,omitempty"`
+	U64                  *wrappers.UInt64Value `protobuf:"bytes,6,opt,name=u64" json:"u64,omitempty"`
+	I32                  *wrappers.Int32Value  `protobuf:"bytes,7,opt,name=i32" json:"i32,omitempty"`
+	U32                  *wrappers.UInt32Value `protobuf:"bytes,8,opt,name=u32" json:"u32,omitempty"`
+	Bool                 *wrappers.BoolValue   `protobuf:"bytes,9,opt,name=bool" json:"bool,omitempty"`
+	Str                  *wrappers.StringValue `protobuf:"bytes,10,opt,name=str" json:"str,omitempty"`
+	Bytes                *wrappers.BytesValue  `protobuf:"bytes,11,opt,name=bytes" json:"bytes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}              `json:"-"`
+	XXX_unrecognized     []byte                `json:"-"`
+	XXX_sizecache        int32                 `json:"-"`
+}
+
+func (m *KnownTypes) Reset()         { *m = KnownTypes{} }
+func (m *KnownTypes) String() string { return proto.CompactTextString(m) }
+func (*KnownTypes) ProtoMessage()    {}
+func (*KnownTypes) Descriptor() ([]byte, []int) {
+	return fileDescriptor_ab4422ec10550c41, []int{0}
+}
+
+func (m *KnownTypes) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_KnownTypes.Unmarshal(m, b)
+}
+func (m *KnownTypes) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_KnownTypes.Marshal(b, m, deterministic)
+}
+func (m *KnownTypes) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_KnownTypes.Merge(m, src)
+}
+func (m *KnownTypes) XXX_Size() int {
+	return xxx_messageInfo_KnownTypes.Size(m)
+}
+func (m *KnownTypes) XXX_DiscardUnknown() {
+	xxx_messageInfo_KnownTypes.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_KnownTypes proto.InternalMessageInfo
+
+func (m *KnownTypes) GetAn() *any.Any {
+	if m != nil {
+		return m.An
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetDur() *duration.Duration {
+	if m != nil {
+		return m.Dur
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetSt() *_struct.Struct {
+	if m != nil {
+		return m.St
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetTs() *timestamp.Timestamp {
+	if m != nil {
+		return m.Ts
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetLv() *_struct.ListValue {
+	if m != nil {
+		return m.Lv
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetVal() *_struct.Value {
+	if m != nil {
+		return m.Val
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetDbl() *wrappers.DoubleValue {
+	if m != nil {
+		return m.Dbl
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetFlt() *wrappers.FloatValue {
+	if m != nil {
+		return m.Flt
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetI64() *wrappers.Int64Value {
+	if m != nil {
+		return m.I64
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetU64() *wrappers.UInt64Value {
+	if m != nil {
+		return m.U64
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetI32() *wrappers.Int32Value {
+	if m != nil {
+		return m.I32
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetU32() *wrappers.UInt32Value {
+	if m != nil {
+		return m.U32
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetBool() *wrappers.BoolValue {
+	if m != nil {
+		return m.Bool
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetStr() *wrappers.StringValue {
+	if m != nil {
+		return m.Str
+	}
+	return nil
+}
+
+func (m *KnownTypes) GetBytes() *wrappers.BytesValue {
+	if m != nil {
+		return m.Bytes
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*KnownTypes)(nil), "jsonpb.KnownTypes")
+}
+
+func init() {
+	proto.RegisterFile("testing/jsonpb_test_proto/test_objects.proto", fileDescriptor_ab4422ec10550c41)
+}
+
+var fileDescriptor_ab4422ec10550c41 = []byte{
+	// 402 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0xd0, 0xdf, 0x6b, 0xd5, 0x30,
+	0x14, 0x07, 0x70, 0x96, 0xee, 0x4e, 0xcd, 0x44, 0x25, 0x88, 0x66, 0xd7, 0xa1, 0x22, 0x82, 0xc3,
+	0x1f, 0x2d, 0xb6, 0xa5, 0xef, 0x0e, 0x11, 0x44, 0x9f, 0xba, 0xe9, 0xeb, 0x48, 0xd6, 0xac, 0x74,
+	0x64, 0x49, 0x49, 0x4e, 0xee, 0xe8, 0xbf, 0xe6, 0x5f, 0x27, 0x49, 0x73, 0x45, 0x6e, 0xc9, 0xde,
+	0xee, 0xcd, 0xf7, 0x73, 0xbe, 0x9c, 0x53, 0xfc, 0x11, 0x84, 0x85, 0x41, 0xf5, 0xc5, 0xb5, 0xd5,
+	0x6a, 0xe4, 0x17, 0xfe, 0xef, 0xc5, 0x68, 0x34, 0xe8, 0x22, 0xfc, 0xd4, 0xfc, 0x5a, 0x5c, 0x82,
+	0xcd, 0xc3, 0x13, 0x39, 0x98, 0xd5, 0xfa, 0xa8, 0xd7, 0xba, 0x97, 0xa2, 0x08, 0xaf, 0xdc, 0x5d,
+	0x15, 0x4c, 0x4d, 0x33, 0x59, 0xbf, 0xdc, 0x8d, 0x3a, 0x67, 0x18, 0x0c, 0x5a, 0xc5, 0xfc, 0x78,
+	0x37, 0xb7, 0x60, 0xdc, 0x25, 0xc4, 0xf4, 0xd5, 0x6e, 0x0a, 0xc3, 0x8d, 0xb0, 0xc0, 0x6e, 0xc6,
+	0x54, 0xfd, 0xad, 0x61, 0xe3, 0x28, 0x4c, 0xdc, 0xf0, 0xcd, 0x9f, 0x15, 0xc6, 0x3f, 0x94, 0xbe,
+	0x55, 0xe7, 0xd3, 0x28, 0x2c, 0x79, 0x8b, 0x11, 0x53, 0xf4, 0xd1, 0xeb, 0xbd, 0x93, 0xc3, 0xf2,
+	0x69, 0x3e, 0xcf, 0xe6, 0xdb, 0xd9, 0xfc, 0x8b, 0x9a, 0x5a, 0xc4, 0x14, 0xf9, 0x80, 0xb3, 0xce,
+	0x19, 0xba, 0x17, 0xd8, 0xd1, 0x82, 0x7d, 0x8d, 0x17, 0xb4, 0x5e, 0x91, 0x77, 0x18, 0x59, 0xa0,
+	0x0f, 0x83, 0x7d, 0xbe, 0xb0, 0x67, 0xe1, 0x9a, 0x16, 0x59, 0x20, 0xef, 0x31, 0x02, 0x4b, 0x51,
+	0x80, 0xeb, 0x05, 0x3c, 0xdf, 0x1e, 0xd6, 0x22, 0xb0, 0xde, 0xca, 0x0d, 0x7d, 0x9c, 0xb0, 0x3f,
+	0x07, 0x0b, 0xbf, 0x99, 0x74, 0xa2, 0x45, 0x72, 0x43, 0x4e, 0x70, 0xb6, 0x61, 0x92, 0x3e, 0x09,
+	0xf8, 0xd9, 0x02, 0xcf, 0xd0, 0x13, 0x92, 0xe3, 0xac, 0xe3, 0x92, 0x66, 0x41, 0x1e, 0x2f, 0xef,
+	0xd2, 0x8e, 0x4b, 0x11, 0x7d, 0xc7, 0x25, 0xf9, 0x84, 0xb3, 0x2b, 0x09, 0x74, 0x3f, 0xf8, 0x17,
+	0x0b, 0xff, 0x4d, 0x6a, 0x16, 0xf7, 0xf0, 0xce, 0xf3, 0xa1, 0xa9, 0xe9, 0x2a, 0xc1, 0xbf, 0x2b,
+	0x68, 0xea, 0xc8, 0x87, 0xa6, 0xf6, 0xdb, 0xb8, 0xa6, 0xa6, 0x07, 0x89, 0x6d, 0x7e, 0xfd, 0xef,
+	0x5d, 0x53, 0x87, 0xfa, 0xaa, 0xa4, 0xf7, 0xd2, 0xf5, 0x55, 0xb9, 0xad, 0xaf, 0xca, 0x50, 0x5f,
+	0x95, 0xf4, 0xfe, 0x1d, 0xf5, 0xff, 0xbc, 0x0b, 0x7e, 0x9f, 0x6b, 0x2d, 0xe9, 0x83, 0xc4, 0x47,
+	0x3f, 0xd5, 0x5a, 0xce, 0x3c, 0x38, 0xdf, 0x6f, 0xc1, 0x50, 0x9c, 0xe8, 0x3f, 0x03, 0x33, 0xa8,
+	0x3e, 0xf6, 0x5b, 0x30, 0xe4, 0x33, 0x5e, 0xf1, 0x09, 0x84, 0xa5, 0x87, 0x89, 0x03, 0x4e, 0x7d,
+	0x3a, 0x0f, 0xcc, 0xf2, 0x6f, 0x00, 0x00, 0x00, 0xff, 0xff, 0xab, 0x65, 0x99, 0x5a, 0x8d, 0x03,
+	0x00, 0x00,
+}
--- a/testing/jsonpb_test_proto/test_objects.proto
+++ b/testing/jsonpb_test_proto/test_objects.proto
@@ -0,0 +1,59 @@
+// Go support for Protocol Buffers - Google's data interchange format
+//
+// Copyright 2015 The Go Authors.  All rights reserved.
+// https://github.com/golang/protobuf
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+import "google/protobuf/any.proto";
+import "google/protobuf/duration.proto";
+import "google/protobuf/struct.proto";
+import "google/protobuf/timestamp.proto";
+import "google/protobuf/wrappers.proto";
+
+package jsonpb;
+
+message KnownTypes {
+  optional google.protobuf.Any an = 14;
+  optional google.protobuf.Duration dur = 1;
+  optional google.protobuf.Struct st = 12;
+  optional google.protobuf.Timestamp ts = 2;
+  optional google.protobuf.ListValue lv = 15;
+  optional google.protobuf.Value val = 16;
+
+  optional google.protobuf.DoubleValue dbl = 3;
+  optional google.protobuf.FloatValue flt = 4;
+  optional google.protobuf.Int64Value i64 = 5;
+  optional google.protobuf.UInt64Value u64 = 6;
+  optional google.protobuf.Int32Value i32 = 7;
+  optional google.protobuf.UInt32Value u32 = 8;
+  optional google.protobuf.BoolValue bool = 9;
+  optional google.protobuf.StringValue str = 10;
+  optional google.protobuf.BytesValue bytes = 11;
+}
--- a/tls_settings_test.go
+++ b/tls_settings_test.go
@@ -109,24 +109,42 @@ func TestBrokenTLS_ClientPlainText(t *testing.T) {
 	}

 	// client connection (usually) succeeds since client is not waiting for TLS handshake
-	e, err := createTestServerAndClient(serverCreds, nil)
-	if err != nil {
-		if strings.Contains(err.Error(), "deadline exceeded") {
-			// It is possible that connection never becomes healthy:
+	// (we try several times, but if we never get a connection and the error message is
+	// a known/expected possibility, we'll just bail)
+	var e testEnv
+	failCount := 0
+	for {
+		e, err = createTestServerAndClient(serverCreds, nil)
+		if err == nil {
+			// success!
+			defer e.Close()
+			break
+		}
+
+		if strings.Contains(err.Error(), "deadline exceeded") ||
+			strings.Contains(err.Error(), "use of closed network connection") {
+			// It is possible that the connection never becomes healthy:
 			//   1) grpc connects successfully
 			//   2) grpc client tries to send HTTP/2 preface and settings frame
 			//   3) server, expecting handshake, closes the connection
 			//   4) in the client, the write fails, so the connection never
 			//      becomes ready
-			// More often than not, the connection becomes ready (presumably
-			// the write to the socket succeeds before the server closes the
-			// connection). But when it does not, it is possible to observe
-			// timeouts when setting up the connection.
-			return
+			// The client will attempt to reconnect on transient errors, so
+			// may eventually bump into the connect time limit. This used to
+			// result in a "deadline exceeded" error, but more recent versions
+			// of the grpc library report any underlying I/O error instead, so
+			// we also check for "use of closed network connection".
+			failCount++
+			if failCount > 5 {
+				return // bail...
+			}
+			// we'll try again
+
+		} else {
+			// some other error occurred, so we'll consider that a test failure
+			t.Fatalf("failed to setup server and client: %v", err)
 		}
-		t.Fatalf("failed to setup server and client: %v", err)
 	}
-	defer e.Close()

 	// but request fails because server closes connection upon seeing request
 	// bytes that are not a TLS handshake
@@ -285,7 +303,7 @@ func simpleTest(t *testing.T, cc *grpc.ClientConn) {
 	cl := grpc_testing.NewTestServiceClient(cc)
 	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
 	defer cancel()
-	_, err := cl.UnaryCall(ctx, &grpc_testing.SimpleRequest{}, grpc.FailFast(false))
+	_, err := cl.UnaryCall(ctx, &grpc_testing.SimpleRequest{}, grpc.WaitForReady(true))
 	if err != nil {
 		t.Errorf("simple RPC failed: %v", err)
 	}
Author	SHA1	Message	Date
Erik Johansson	b8c67b7a4e	Bump grpc-go to 1.30.0 (#168 ) * Bump grpc-go to 1.30.0 * Import new xds package instead of experimental Co-authored-by: Erik Johansson <ejohansson@spotify.com>	2020-07-13 13:16:48 -04:00
Joshua Humphries	ff114930fd	update travis badge and link	2020-07-09 20:53:23 -04:00
Joshua Humphries	5ad5edb29c	pin goreleaser in go.mod; fix config file so latest version accepts it; allow using go modules in 'make release' (#161 )	2020-06-01 18:56:18 -04:00
Joshua Humphries	44547153b3	unpin Go point release and alpine version in Dockerfile (#162 )	2020-05-15 11:40:32 -04:00
Joshua Humphries	2108c8f0b3	use go 1.13 to build docker image (#160 )	2020-05-15 08:21:08 -04:00
Mikhail Katychev	36008aa111	Add -format-error option (#155 )	2020-05-14 20:40:13 -04:00
Joshua Humphries	50833f1b21	upgrade deps; remove go 1.14 from go.mod (#158 )	2020-05-14 20:00:04 -04:00
Joshua Humphries	939766fb42	Go tip does not like using string(i) where i untyped int (#159 )	2020-05-14 19:38:08 -04:00
Joshua Humphries	b58182a88d	get travis CI green again (#157 ) * fix test to work w/ newer grpc repo; run 'make ci' to have it update go.mod and go.sum, trying to repro ci failure locally * vet w/ go 1.13; use normal go proxy instead of direct in CI	2020-05-12 13:06:14 -04:00
Serge Bazanski	8e2cf9b3c2	fix crash when emitting empty messages in text format (#153 )	2020-04-23 16:20:45 -04:00
Alexander Chiu	36f9e53dfd	Allow extra descriptor sources in reflection mode (#146 ) Allows descriptors or proto files to be supplied that are used as an additional descriptor source when server reflection is used. This is needed to resolve message types embedded in an Any message, that the server has no knowledge of, as well as extensions that the server has no knowledge of.	2020-04-20 15:42:11 -04:00
Joshua Humphries	bfbbed1d42	vet with modules (#150 ) fixes CI failures caused by newer version of dependency introducing new deprecations that cause staticcheck violations	2020-04-16 15:27:01 -04:00
Johan Brandhorst	153d36db8c	Remove golang/protobuf/jsonpbtest dep (#145 ) With 1.4.0 the golang/protobuf json testing protofiles are being moved to [an internal package][1]. While this is technically a breaking change, I doubt the maintainers are going to reintroduce it, so I've copied the necessary parts to our own testing protofile. This allows users of this package and, more importantly, grpcui to try 1.4.0 without this package having to migrate yet. When it comes to migrating to 1.4.0, this should also make the transition easier. [1]: https://github.com/golang/protobuf/tree/v1.4.0-rc.4/internal/testprotos	2020-04-03 12:45:05 -04:00
Joshua Humphries	2af40876fc	drop Go 1.9 and 1.10 from CI; add 1.13 and 1.14 (#144 )	2020-04-01 09:02:40 -04:00
Joshua Humphries	0218a7db67	add script and readme for creating new releases (#140 )	2020-03-18 08:51:18 -04:00
Richard Belleville	96cfd48e32	Activate xDS support in grpcurl (#137 )	2020-03-13 16:29:41 -04:00
Richard Belleville	d30f3a01b7	Bump grpc to 1.28 (#136 )	2020-03-12 18:55:09 -04:00
Joshua Humphries	0d669e78d0	use wrapped TransportCredentials instead of handling handshake in Dialer (#130 ) * use wrapped TransportCredentials instead of handling handshake in Dialer, so that grpc library will use correct :scheme * support -authority for TLS conns; now effectively supercedes -servername flag	2020-01-27 12:15:47 -05:00
Blake Williams	9572bd4525	Register gzip decoder (#124 )	2019-11-26 08:55:50 -05:00
Joshua Humphries	ccc9007156	add -protoset-out option (#120 )	2019-09-30 09:50:17 -04:00
J M	9248ea0963	Add Expand Headers Feature (#117 )	2019-09-26 17:26:38 -04:00
Joshua Humphries	4054d1d115	fix go.mod for Go 1.13 (#110 )	2019-08-09 14:17:53 -04:00
Joshua Humphries	5631bba117	add official Dockerfile (#104 )	2019-07-03 15:57:24 -04:00
Joshua Humphries	80425d1b17	use protoreflect 1.4.4 (#109 )	2019-07-03 15:56:51 -04:00
Joshua Humphries	7e4045565f	update all deps; use new ResolveFilenames method (#103 )	2019-05-24 10:26:38 -04:00
Joshua Humphries	e5b4fc6cc0	add API to expose AnyResolver implementations backed by a DescriptorSource (#102 )	2019-05-22 21:38:46 -04:00
Joshua Humphries	09c3d1d69e	use just-released v1.3.0 protoreflect (#101 )	2019-05-22 16:20:41 -04:00
Joshua Humphries	5d6316f470	Adds support for showing error details (#98 ) To better support printing of google.protobuf.Any messages (error details), this also makes a few other changes: 1. Allows printing of unresolvable Any messages using an "@value" field in JSON output that has the base64-encoded embedded message data. 2. Improves support for "-format text" to show expanded Any messages if possible. (Due to limitations in underlying proto package, this will usually not be that helpful. But this should greatly improve with v2 of the go protobuf API.) 3. Addresses a TODO in existing AnyResolver code to lazily fetch descriptors as needed instead of having to download all files eagerly.	2019-04-09 09:34:39 -04:00
Joshua Humphries	f0723c6273	fix flaky test (#93 )	2019-03-25 10:34:32 -04:00
Joshua Humphries	fe97274a1b	staticcheck no longer runs on Go 1.10 (#92 ) * staticcheck no longer runs on Go 1.10, so run it on Go 1.11 in CI * be explicit about default make target in .travis.yml	2019-03-22 14:35:01 -04:00
CodeLingo Team	1bbf8dae71	Fix function comments based on best practices from Effective Go (#87 ) Signed-off-by: CodeLingo Bot <bot@codelingo.io>	2019-03-13 10:58:13 -04:00