control: Implement service command 'stop,restart,status'. (#2883)

- stop - stops all the servers.
- restart - restart all the servers.
- status - prints status of storage info about the cluster.

cmd/control-service-main.go

@@ -0,0 +1,96 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"net/url"
+	"path"
+
+	"github.com/minio/cli"
+	"github.com/minio/mc/pkg/console"
+)
+
+var serviceCmd = cli.Command{
+	Name:   "service",
+	Usage:  "Service command line to manage Minio server.",
+	Action: serviceControl,
+	Flags:  globalFlags,
+	CustomHelpTemplate: `NAME:
+  minio control {{.Name}} - {{.Usage}}
+
+USAGE:
+  minio control {{.Name}} [status|restart|stop] URL
+
+FLAGS:
+  {{range .Flags}}{{.}}
+  {{end}}
+EXAMPLES:
+  1. Prints current status information of the cluster.
+    $ minio control service status http://10.1.10.92:9000/
+
+  2. Restarts the url and all the servers in the cluster.
+    $ minio control service restart http://localhost:9000/
+
+  3. Shuts down the url and all the servers in the cluster.
+    $ minio control service stop http://localhost:9000/
+`,
+}
+
+// "minio control service" entry point.
+func serviceControl(c *cli.Context) {
+	if !c.Args().Present() && len(c.Args()) != 2 {
+		cli.ShowCommandHelpAndExit(c, "service", 1)
+	}
+
+	var signal serviceSignal
+	switch c.Args().Get(0) {
+	case "status":
+		signal = serviceStatus
+	case "restart":
+		signal = serviceRestart
+	case "stop":
+		signal = serviceStop
+	default:
+		fatalIf(errInvalidArgument, "Unsupported signalling requested %s", c.Args().Get(0))
+	}
+
+	parsedURL, err := url.Parse(c.Args().Get(1))
+	fatalIf(err, "Unable to parse URL %s", c.Args().Get(1))
+
+	authCfg := &authConfig{
+		accessKey:   serverConfig.GetCredential().AccessKeyID,
+		secretKey:   serverConfig.GetCredential().SecretAccessKey,
+		secureConn:  parsedURL.Scheme == "https",
+		address:     parsedURL.Host,
+		path:        path.Join(reservedBucket, controlPath),
+		loginMethod: "Controller.LoginHandler",
+	}
+	client := newAuthClient(authCfg)
+
+	args := &ServiceArgs{
+		Signal: signal,
+		// This is necessary so that the remotes,
+		// don't end up sending requests back and forth.
+		Remote: true,
+	}
+	reply := &ServiceReply{}
+	err = client.Call("Controller.ServiceHandler", args, reply)
+	fatalIf(err, "Service command %s failed for %s", c.Args().Get(0), parsedURL.Host)
+	if signal == serviceStatus {
+		console.Println(getStorageInfoMsg(reply.StorageInfo))
+	}
+}