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kubectl.go
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kubectl.go
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package main
import (
"bufio"
"bytes"
"errors"
"fmt"
"github.com/fatih/color"
"io"
"os"
"os/exec"
"strings"
)
func (client *KubeClient) GetDeployedBranchHashes(namespace string) ([]string, error) {
usingContext := false
if client.Context != "" {
client.UseContext()
usingContext = true
}
cmdName := "kubectl"
cmdArgs := []string{
"get",
"deployments,rc,rs,pvc,svc,cronjobs",
"-o",
"jsonpath={.items[*].metadata.labels.branch_hash}",
fmt.Sprintf("--namespace=%s", namespace),
}
if !usingContext {
cmdArgs = append(cmdArgs, fmt.Sprintf("--server=%s", client.Server))
cmdArgs = append(cmdArgs, fmt.Sprintf("--token=%s", client.Token))
}
cmd := exec.Command(cmdName, cmdArgs...)
var out bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &out
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
return nil, errors.New(string(stderr.String()))
}
output := out.String()
branches := strings.Split(string(output), " ")
branches = Unique(branches)
branches = Filter(branches, func(v string) bool {
return v != ""
})
return branches, nil
}
func (client *KubeClient) DeleteObjectsByBranch(branchHash string, namespace string, labelList map[string]string, dryRun bool) (string, error) {
usingContext := false
if client.Context != "" {
client.UseContext()
usingContext = true
}
cmdName := "kubectl"
cmdArgs := []string{
"delete",
"deployments,rc,rs,pvc,svc,cronjobs",
"-l",
fmt.Sprintf("branch_hash=%s", branchHash),
fmt.Sprintf("--namespace=%s", namespace),
}
if !usingContext {
cmdArgs = append(cmdArgs, fmt.Sprintf("--server=%s", client.Server))
cmdArgs = append(cmdArgs, fmt.Sprintf("--token=%s", client.Token))
}
for labelName, labelValue := range labelList {
cmdArgs = append(cmdArgs, fmt.Sprintf("-l %s=%s", labelName, labelValue))
}
if dryRun {
cmdArgs = append(cmdArgs, "--dry-run")
}
cmd := exec.Command(cmdName, cmdArgs...)
var out bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &out
cmd.Stderr = &stderr
err := cmd.Run()
if err != nil {
return "", errors.New(string(stderr.String()))
}
output := out.String()
return output, err
}
func (client *KubeClient) Version() {
usingContext := false
if client.Context != "" {
client.UseContext()
usingContext = true
}
cmdArgs := []string{
"version",
}
if !usingContext {
cmdArgs = append(cmdArgs, fmt.Sprintf("--server=%s", client.Server))
cmdArgs = append(cmdArgs, fmt.Sprintf("--token=%s", client.Token))
}
client.runCommand("kubectl", cmdArgs, "")
fmt.Println()
}
func (client *KubeClient) UseContext() {
cmdArgs := []string{
"config",
"use-context",
client.Context,
}
client.runCommand("kubectl", cmdArgs, "")
}
func (client *KubeClient) Apply(definition string, namespace string, dryRun bool) {
usingContext := false
if client.Context != "" {
client.UseContext()
usingContext = true
}
cmdArgs := []string{
"apply",
"-f",
"-",
fmt.Sprintf("--namespace=%s", namespace),
}
if !usingContext {
cmdArgs = append(cmdArgs, fmt.Sprintf("--server=%s", client.Server))
cmdArgs = append(cmdArgs, fmt.Sprintf("--token=%s", client.Token))
}
if dryRun {
cmdArgs = append(cmdArgs, "--dry-run")
}
client.runCommand("kubectl", cmdArgs, definition)
}
func (client *KubeClient) runCommand(cmdName string, cmdArgs []string, input string) {
cmd := exec.Command(cmdName, cmdArgs...)
cmd.Stderr = cmd.Stdout
if client.Verbose {
color.Yellow(input)
}
stdin, _ := cmd.StdinPipe()
defer stdin.Close() // the doc says subProcess.Wait will close it, but I'm not sure, so I kept this line
stdoutPipe, _ := cmd.StdoutPipe()
stderrPipe, _ := cmd.StderrPipe()
stdOutScanner := bufio.NewScanner(stdoutPipe)
go func() {
for stdOutScanner.Scan() {
color.Green("%s\n", stdOutScanner.Text())
}
}()
stdErrScanner := bufio.NewScanner(stderrPipe)
go func() {
for stdErrScanner.Scan() {
color.Red("%s\n", stdErrScanner.Text())
}
}()
cmd.Start()
io.WriteString(stdin, input+"\n")
stdin.Close()
err := cmd.Wait()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
type KubeClient struct {
Server string
Token string
Context string
Verbose bool
}