/
main.go
222 lines (186 loc) · 4.78 KB
/
main.go
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package main
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto/tls"
"encoding/json"
"flag"
"fmt"
"github.com/dotcloud/docker"
dockerClient "github.com/rsampaio/go-dockerclient"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"strconv"
)
var fUser = flag.String("username", "", "heroku username")
var fToken = flag.String("token", "", "heroku account token")
var fApp = flag.String("app", "", "heroku app name")
var fRelease = flag.Int("release", 1, "application release")
var fProcess = flag.String("process", "web", "process type")
var baseUrl = "https://api.heroku.com"
var appName string
type Releases struct {
Id string
Slug map[string]interface{}
}
type Volume struct {
string
}
type Slug struct {
Blob map[string]interface{}
Process_Types map[string]interface{}
}
func HttpClient() *http.Client {
tr := &http.Transport{
TLSClientConfig: &tls.Config{},
DisableCompression: true,
}
client := &http.Client{Transport: tr}
return client
}
func MakeRequest(appName string, what string, id string) *http.Request {
requestUrl := fmt.Sprintf("%s/apps/%s/%s/%s", baseUrl, appName, what, id)
request, err := http.NewRequest("GET", requestUrl, nil)
if err != nil {
panic("request create")
}
request.Header.Add("Accept", "application/vnd.heroku+json; version=3")
request.SetBasicAuth(*fUser, *fToken)
return request
}
func GetSlugIdForRelease(appName string, release_name string) string {
client := HttpClient()
request := MakeRequest(appName, "releases", release_name)
resp, err := client.Do(request)
if err != nil {
panic(err)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err)
}
defer resp.Body.Close()
var release Releases
err = json.Unmarshal(body, &release)
if err != nil {
panic(err)
}
return release.Slug["id"].(string)
}
func GetSlugBlobUrl(appName string, slugId string) Slug {
client := HttpClient()
request := MakeRequest(appName, "slugs", slugId)
resp, err := client.Do(request)
if err != nil {
panic(err)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err)
}
defer resp.Body.Close()
var slug Slug
err = json.Unmarshal(body, &slug)
if err != nil {
panic(err)
}
return slug
}
func FetchSlugArchive(appName string, slug_url string) *bytes.Buffer {
buf := new(bytes.Buffer)
client := HttpClient()
request, err := http.NewRequest("GET", slug_url, nil)
resp, err := client.Do(request)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
buf.Write(body)
return buf
}
func UntarFiles(buffer *bytes.Buffer) {
os.RemoveAll("app")
r, _ := gzip.NewReader(buffer)
tr := tar.NewReader(r)
for {
hdr, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
log.Fatalln(err)
}
os.MkdirAll(path.Dir(hdr.Name), os.FileMode(0775))
if hdr.Linkname != "" {
err = os.Symlink(hdr.Linkname, hdr.Name)
if err != nil {
panic(err)
}
} else {
fileContent, _ := ioutil.ReadAll(tr)
ioutil.WriteFile(hdr.Name, fileContent, os.FileMode(0775))
}
}
}
func RunDockerContainer(cmd string) {
herokuClient := HttpClient()
request := MakeRequest(appName, "config-vars", "")
resp, err := herokuClient.Do(request)
if err != nil {
panic("do request")
}
herokuEnv, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic("read response")
}
fmt.Println("Heroku Env:", string(herokuEnv))
cwd, _ := os.Getwd()
dClient, err := dockerClient.NewClient("unix:///var/run/docker.sock")
if err != nil {
panic("new client")
}
var config docker.Config
exposedPorts := make(map[docker.Port]struct{})
exposedPorts["80"] = struct{}{}
volumes := make(map[string]struct{})
volumes["/app"] = struct{}{}
config.Volumes = volumes
config.ExposedPorts = exposedPorts
config.Cmd = []string{"/bin/bash", "-c", cmd}
config.Env = []string{"PORT=80"}
config.Image = "heroku-runtime"
config.WorkingDir = "/app"
container, err := dClient.CreateContainer(dockerClient.CreateContainerOptions{}, &config)
if err != nil {
panic("create container")
}
err = dClient.StartContainer(container.ID, &docker.HostConfig{Binds: []string{cwd + "/app:/app"}})
if err != nil {
panic("start container")
}
fmt.Fprintf(os.Stdout, "%s\n", container.ID)
}
func main() {
flag.Parse()
if flag.NFlag() < 5 {
flag.PrintDefaults()
os.Exit(-1)
}
appName := *fApp
release_name := strconv.Itoa(*fRelease)
slugId := GetSlugIdForRelease(appName, release_name)
fmt.Fprintf(os.Stderr, "Slug ID: %s\n", slugId)
slug := GetSlugBlobUrl(appName, slugId)
fmt.Fprintf(os.Stderr, "Slug URL: %s\n", slug.Blob["get"].(string))
tarBuffer := FetchSlugArchive(appName, slug.Blob["get"].(string))
fmt.Fprintf(os.Stderr, "Download complete, unpacking.\n")
UntarFiles(tarBuffer)
fmt.Fprintf(os.Stderr, "Unpack complete\n")
RunDockerContainer(slug.Process_Types[*fProcess].(string))
}