forked from vulcand/vulcand
/
main.go
152 lines (132 loc) · 3.29 KB
/
main.go
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package main
import (
"fmt"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/mailgun/vulcand/Godeps/_workspace/src/github.com/codegangsta/cli"
"github.com/mailgun/vulcand/Godeps/_workspace/src/github.com/mailgun/log"
)
var vulcanUrl string
func main() {
log.Init([]*log.LogConfig{&log.LogConfig{Name: "console"}})
app := cli.NewApp()
app.Name = "vulcanbundle"
app.Usage = "Command line interface to compile plugins into vulcan binary"
app.Commands = []cli.Command{
{
Name: "init",
Usage: "Init bundle",
Action: initBundle,
Flags: []cli.Flag{
cli.StringSliceFlag{
Name: "middleware, m",
Value: &cli.StringSlice{},
Usage: "Path to repo and revision, e.g. github.com/mailgun/vulcand-plugins/auth",
},
},
},
}
err := app.Run(os.Args)
if err != nil {
log.Errorf("Error: %s\n", err)
}
}
func initBundle(c *cli.Context) {
b, err := NewBundler(c.StringSlice("middleware"))
if err != nil {
log.Errorf("Failed to bundle middlewares: %s", err)
return
}
if err := b.bundle(); err != nil {
log.Errorf("Failed to bundle middlewares: %s", err)
} else {
log.Infof("SUCCESS: bundle vulcand and vulcanctl completed")
}
}
type Bundler struct {
bundleDir string
middlewares []string
}
func NewBundler(middlewares []string) (*Bundler, error) {
return &Bundler{middlewares: middlewares}, nil
}
func (b *Bundler) bundle() error {
if err := b.writeTemplates(); err != nil {
return err
}
return nil
}
func (b *Bundler) writeTemplates() error {
vulcandPath := "."
packagePath, err := getPackagePath(vulcandPath)
if err != nil {
return err
}
context := struct {
Packages []Package
PackagePath string
}{
Packages: appendPackages(builtinPackages(), b.middlewares),
PackagePath: packagePath,
}
if err := writeTemplate(
filepath.Join(vulcandPath, "main.go"), mainTemplate, context); err != nil {
return err
}
if err := writeTemplate(
filepath.Join(vulcandPath, "registry", "registry.go"), registryTemplate, context); err != nil {
return err
}
if err := writeTemplate(
filepath.Join(vulcandPath, "vulcanctl", "main.go"), vulcanctlTemplate, context); err != nil {
return err
}
return nil
}
type Package string
func (p Package) Name() string {
values := strings.Split(string(p), "/")
return values[len(values)-1]
}
func builtinPackages() []Package {
return []Package{
"github.com/mailgun/vulcand/plugin/connlimit",
"github.com/mailgun/vulcand/plugin/ratelimit",
"github.com/mailgun/vulcand/plugin/rewrite",
"github.com/mailgun/vulcand/plugin/cbreaker",
}
}
func getPackagePath(dir string) (string, error) {
path, err := filepath.Abs(dir)
if err != nil {
return "", err
}
out := strings.Split(path, "src/")
if len(out) != 2 {
return "", fmt.Errorf("failed to locate package path (missing top level src folder)")
}
return out[1], nil
}
func appendPackages(in []Package, a []string) []Package {
for _, p := range a {
in = append(in, Package(p))
}
return in
}
func writeTemplate(filename, contents string, data interface{}) error {
if err := os.MkdirAll(filepath.Dir(filename), 0755); err != nil {
return err
}
t, err := template.New(filename).Parse(contents)
if err != nil {
return err
}
file, err := os.Create(filename)
if err != nil {
return err
}
defer file.Close()
return t.Execute(file, data)
}