forked from iron-io/functions
/
common.go
224 lines (197 loc) · 4.91 KB
/
common.go
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package main
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"text/template"
"github.com/iron-io/functions/fn/langs"
)
func verbwriter(verbose bool) io.Writer {
verbwriter := ioutil.Discard
if verbose {
verbwriter = os.Stderr
}
return verbwriter
}
func buildfunc(verbwriter io.Writer, fn string) (*funcfile, error) {
funcfile, err := parsefuncfile(fn)
if err != nil {
return nil, err
}
if funcfile.Version == "" {
funcfile, err = bumpversion(*funcfile)
if err != nil {
return nil, err
}
if err := storefuncfile(fn, funcfile); err != nil {
return nil, err
}
funcfile, err = parsefuncfile(fn)
if err != nil {
return nil, err
}
}
if err := localbuild(verbwriter, fn, funcfile.Build); err != nil {
return nil, err
}
if err := dockerbuild(verbwriter, fn, funcfile); err != nil {
return nil, err
}
return funcfile, nil
}
func localbuild(verbwriter io.Writer, path string, steps []string) error {
for _, cmd := range steps {
exe := exec.Command("/bin/sh", "-c", cmd)
exe.Dir = filepath.Dir(path)
exe.Stderr = verbwriter
exe.Stdout = verbwriter
if err := exe.Run(); err != nil {
return fmt.Errorf("error running command %v (%v)", cmd, err)
}
}
return nil
}
func dockerbuild(verbwriter io.Writer, path string, ff *funcfile) error {
dir := filepath.Dir(path)
var helper langs.LangHelper
dockerfile := filepath.Join(dir, "Dockerfile")
if !exists(dockerfile) {
err := writeTmpDockerfile(dir, ff)
defer os.Remove(filepath.Join(dir, "Dockerfile"))
if err != nil {
return err
}
helper = langs.GetLangHelper(*ff.Runtime)
if helper == nil {
return fmt.Errorf("Cannot build, no language helper found for %v", *ff.Runtime)
}
if helper.HasPreBuild() {
err := helper.PreBuild()
if err != nil {
return err
}
}
}
fmt.Printf("Building image %v\n", ff.FullName())
cmd := exec.Command("docker", "build", "-t", ff.FullName(), ".")
cmd.Dir = dir
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
if err := cmd.Run(); err != nil {
return fmt.Errorf("error running docker build: %v", err)
}
if helper != nil {
err := helper.AfterBuild()
if err != nil {
return err
}
}
return nil
}
func exists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
var acceptableFnRuntimes = map[string]string{
"elixir": "iron/elixir",
"erlang": "iron/erlang",
"gcc": "iron/gcc",
"go": "iron/go",
"java": "iron/java",
"leiningen": "iron/leiningen",
"mono": "iron/mono",
"node": "iron/node",
"perl": "iron/perl",
"php": "iron/php",
"python": "iron/python:2",
"ruby": "iron/ruby",
"scala": "iron/scala",
"rust": "corey/rust-alpine",
"dotnet": "microsoft/dotnet:runtime",
"lambda-nodejs4.3": "iron/functions-lambda:nodejs4.3",
}
const tplDockerfile = `FROM {{ .BaseImage }}
WORKDIR /function
ADD . /function/
{{ if ne .Entrypoint "" }} ENTRYPOINT [{{ .Entrypoint }}] {{ end }}
{{ if ne .Cmd "" }} CMD [{{ .Cmd }}] {{ end }}
`
func writeTmpDockerfile(dir string, ff *funcfile) error {
if ff.Entrypoint == "" && ff.Cmd == "" {
return errors.New("entrypoint and cmd are missing, you must provide one or the other")
}
runtime, tag := ff.RuntimeTag()
rt, ok := acceptableFnRuntimes[runtime]
if !ok {
return fmt.Errorf("cannot use runtime %s", runtime)
}
if tag != "" {
rt = fmt.Sprintf("%s:%s", rt, tag)
}
fd, err := os.Create(filepath.Join(dir, "Dockerfile"))
if err != nil {
return err
}
defer fd.Close()
// convert entrypoint string to slice
bufferEp := stringToSlice(ff.Entrypoint)
bufferCmd := stringToSlice(ff.Cmd)
t := template.Must(template.New("Dockerfile").Parse(tplDockerfile))
err = t.Execute(fd, struct {
BaseImage, Entrypoint, Cmd string
}{rt, bufferEp.String(), bufferCmd.String()})
return err
}
func stringToSlice(in string) bytes.Buffer {
epvals := strings.Fields(in)
var buffer bytes.Buffer
for i, s := range epvals {
if i > 0 {
buffer.WriteString(", ")
}
buffer.WriteString("\"")
buffer.WriteString(s)
buffer.WriteString("\"")
}
return buffer
}
func extractEnvConfig(configs []string) map[string]string {
c := make(map[string]string)
for _, v := range configs {
kv := strings.SplitN(v, "=", 2)
if len(kv) == 2 {
c[kv[0]] = os.ExpandEnv(kv[1])
}
}
return c
}
func dockerpush(ff *funcfile) error {
cmd := exec.Command("docker", "push", ff.FullName())
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
if err := cmd.Run(); err != nil {
return fmt.Errorf("error running docker push: %v", err)
}
return nil
}
func appNamePath(img string) (string, string) {
sep := strings.Index(img, "/")
if sep < 0 {
return "", ""
}
tag := strings.Index(img[sep:], ":")
if tag < 0 {
tag = len(img[sep:])
}
return img[:sep], img[sep : sep+tag]
}