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docker.go
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docker.go
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/*
* Copyright (c) 2019 WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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 docker
import (
"bufio"
"bytes"
"fmt"
"log"
"os/exec"
"strings"
)
const docker = "docker"
const push = "push"
type Docker interface {
ServerVersion() (string, error)
ClientVersion() (string, error)
PushImages(dockerImages []string) error
}
type CelleryDockerCli struct {
}
// NewCelleryDockerCli returns a CelleryDockerCli instance.
func NewCelleryDockerCli() *CelleryDockerCli {
cli := &CelleryDockerCli{}
return cli
}
// ServerVersion returns the docker server version.
func (cli *CelleryDockerCli) ServerVersion() (string, error) {
cmd := exec.Command(docker,
"version",
"--format",
"{{.Server.Version}}",
)
dockerServerResult, err := cmd.CombinedOutput()
if err != nil {
return string(dockerServerResult), fmt.Errorf("error while getting Docker Server version, %v", strings.TrimSpace(string(dockerServerResult)))
}
return string(dockerServerResult), nil
}
// ClientVersion returns the docker client version.
func (cli *CelleryDockerCli) ClientVersion() (string, error) {
cmd := exec.Command(docker,
"version",
"--format",
"{{.Client.Version}}",
)
dockerClientResult, err := cmd.CombinedOutput()
if err != nil {
return string(dockerClientResult), fmt.Errorf("error while getting Docker Client version, %v", strings.TrimSpace(string(dockerClientResult)))
}
return string(dockerClientResult), nil
}
// PushImages pushes docker images.
func (cli *CelleryDockerCli) PushImages(dockerImages []string) error {
// Todo: Update method signature as PushImage(dockerImage string)
log.Printf("Pushing docker images [%s]", strings.Join(dockerImages, ", "))
for _, elem := range dockerImages {
cmd := exec.Command(docker,
push,
elem,
)
execError := ""
stderrReader, _ := cmd.StderrPipe()
stderrScanner := bufio.NewScanner(stderrReader)
go func() {
for stderrScanner.Scan() {
execError += stderrScanner.Text()
}
}()
var stdout, stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err := cmd.Start()
if err != nil {
errStr := string(stderr.Bytes())
fmt.Printf("%s\n", errStr)
return fmt.Errorf("error occurred while pushing Docker image, %v", err)
}
err = cmd.Wait()
if err != nil {
fmt.Println()
fmt.Printf("\x1b[31;1m\nPush Failed.\x1b[0m %v \n", execError)
fmt.Println("\x1b[31;1m======================\x1b[0m")
errStr := string(stderr.Bytes())
fmt.Printf("\x1b[31;1m%s\x1b[0m", errStr)
return fmt.Errorf("error occurred while pushing cell image, %v", err)
}
}
return nil
}