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minio: Server upon start displays a message if update is available.

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This code also handles to turn itself off when network is not
available and if request fails. Also prints only when the update
is available.
This commit is contained in:
Harshavardhana
2016-03-24 17:20:49 -07:00
parent 24ae5467c8
commit 3538c9f598
7 changed files with 189 additions and 94 deletions
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notifier.go
+16 -22
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@@ -18,7 +18,6 @@ package main
import (
"fmt"
"math"
"runtime"
"strings"
@@ -29,25 +28,22 @@ import (
// colorizeUpdateMessage - inspired from Yeoman project npm package https://github.com/yeoman/update-notifier
func colorizeUpdateMessage(updateString string) (string, *probe.Error) {
// initialize coloring
// Initialize coloring.
cyan := color.New(color.FgCyan, color.Bold).SprintFunc()
yellow := color.New(color.FgYellow, color.Bold).SprintfFunc()
// calculate length without color coding, due to ANSI color characters padded to actual
// string the final length is wrong than the original string length
line1Str := fmt.Sprintf(" Update available: ")
line2Str := fmt.Sprintf(" Run \"%s\" to update. ", updateString)
// Calculate length without color coding, due to ANSI color
// characters padded to actual string the final length is wrong
// than the original string length.
line1Str := fmt.Sprintf(" New update: %s ", updateString)
line1Length := len(line1Str)
line2Length := len(line2Str)
// populate lines with color coding
line1InColor := line1Str
line2InColor := fmt.Sprintf(" Run \"%s\" to update. ", cyan(updateString))
// Populate lines with color coding.
line1InColor := fmt.Sprintf(" New update: %s ", cyan(updateString))
// calculate the rectangular box size
maxContentWidth := int(math.Max(float64(line1Length), float64(line2Length)))
// Calculate the rectangular box size.
maxContentWidth := line1Length
line1Rest := maxContentWidth - line1Length
line2Rest := maxContentWidth - line2Length
terminal, err := ts.GetSize()
if err != nil {
@@ -56,31 +52,29 @@ func colorizeUpdateMessage(updateString string) (string, *probe.Error) {
var message string
switch {
case len(line2Str) > terminal.Col():
message = "\n" + line1InColor + "\n" + line2InColor + "\n"
case len(line1Str) > terminal.Col():
message = "\n" + line1InColor + "\n"
default:
// on windows terminal turn off unicode characters
// On windows terminal turn off unicode characters.
var top, bottom, sideBar string
if runtime.GOOS == "windows" {
top = yellow("*" + strings.Repeat("*", maxContentWidth) + "*")
bottom = yellow("*" + strings.Repeat("*", maxContentWidth) + "*")
sideBar = yellow("|")
} else {
// color the rectangular box, use unicode characters here
// Color the rectangular box, use unicode characters here.
top = yellow("┏" + strings.Repeat("━", maxContentWidth) + "┓")
bottom = yellow("┗" + strings.Repeat("━", maxContentWidth) + "┛")
sideBar = yellow("┃")
}
// fill spaces to the rest of the area
// Fill spaces to the rest of the area.
spacePaddingLine1 := strings.Repeat(" ", line1Rest)
spacePaddingLine2 := strings.Repeat(" ", line2Rest)
// construct the final message
// Construct the final message.
message = "\n" + top + "\n" +
sideBar + line1InColor + spacePaddingLine1 + sideBar + "\n" +
sideBar + line2InColor + spacePaddingLine2 + sideBar + "\n" +
bottom + "\n"
}
// return the final message
// Return the final message.
return message, nil
}