// genSource renders the given template to produce source code, which it writes
// to the given directory and file.
func genSource(dir, filename, templateSource string, args map[string]interface{}) {
sourceCode := revel.ExecuteTemplate(
template.Must(template.New("").Parse(templateSource)),
args)
// Create a fresh dir.
tmpPath := path.Join(revel.AppPath, dir)
err := os.RemoveAll(tmpPath)
if err != nil {
revel.ERROR.Println("Failed to remove dir:", err)
}
err = os.Mkdir(tmpPath, 0777)
if err != nil {
revel.ERROR.Fatalf("Failed to make tmp directory: %v", err)
}
// Create the file
file, err := os.Create(path.Join(tmpPath, filename))
defer file.Close()
if err != nil {
revel.ERROR.Fatalf("Failed to create file: %v", err)
}
_, err = file.WriteString(sourceCode)
if err != nil {
revel.ERROR.Fatalf("Failed to write to file: %v", err)
}
}
// Build the app:
// 1. Generate the the main.go file.
// 2. Run the appropriate "go build" command.
// Requires that revel.Init has been called previously.
// Returns the path to the built binary, and an error if there was a problem building it.
func Build() (app *App, compileError *revel.Error) {
sourceInfo, compileError := ProcessSource(revel.CodePaths)
if compileError != nil {
return nil, compileError
}
// Add the db.import to the import paths.
if dbImportPath, found := revel.Config.String("db.import"); found {
sourceInfo.InitImportPaths = append(sourceInfo.InitImportPaths, dbImportPath)
}
tmpl := template.Must(template.New("").Parse(REGISTER_CONTROLLERS))
registerControllerSource := revel.ExecuteTemplate(tmpl, map[string]interface{}{
"Controllers": sourceInfo.ControllerSpecs,
"ValidationKeys": sourceInfo.ValidationKeys,
"ImportPaths": calcImportAliases(sourceInfo),
"TestSuites": sourceInfo.TestSuites,
})
// Create a fresh temp dir.
tmpPath := path.Join(revel.AppPath, "tmp")
err := os.RemoveAll(tmpPath)
if err != nil {
revel.ERROR.Println("Failed to remove tmp dir:", err)
}
err = os.Mkdir(tmpPath, 0777)
if err != nil {
revel.ERROR.Fatalf("Failed to make tmp directory: %v", err)
}
// Create the main.go file
controllersFile, err := os.Create(path.Join(tmpPath, "main.go"))
defer controllersFile.Close()
if err != nil {
revel.ERROR.Fatalf("Failed to create main.go: %v", err)
}
_, err = controllersFile.WriteString(registerControllerSource)
if err != nil {
revel.ERROR.Fatalf("Failed to write to main.go: %v", err)
}
// Read build config.
buildTags := revel.Config.StringDefault("build.tags", "")
// Build the user program (all code under app).
// It relies on the user having "go" installed.
goPath, err := exec.LookPath("go")
if err != nil {
revel.ERROR.Fatalf("Go executable not found in PATH.")
}
ctx := build.Default
pkg, err := ctx.Import(revel.ImportPath, "", build.FindOnly)
if err != nil {
revel.ERROR.Fatalln("Failure importing", revel.ImportPath)
}
binName := path.Join(pkg.BinDir, path.Base(revel.BasePath))
if runtime.GOOS == "windows" {
binName += ".exe"
}
gotten := make(map[string]struct{})
for {
buildCmd := exec.Command(goPath, "build",
"-tags", buildTags,
"-o", binName, path.Join(revel.ImportPath, "app", "tmp"))
revel.TRACE.Println("Exec:", buildCmd.Args)
output, err := buildCmd.CombinedOutput()
// If the build succeeded, we're done.
if err == nil {
return NewApp(binName), nil
}
revel.ERROR.Println(string(output))
// See if it was an import error that we can go get.
matches := importErrorPattern.FindStringSubmatch(string(output))
if matches == nil {
return nil, newCompileError(output)
}
// Ensure we haven't already tried to go get it.
pkgName := matches[1]
if _, alreadyTried := gotten[pkgName]; alreadyTried {
return nil, newCompileError(output)
}
gotten[pkgName] = struct{}{}
// Execute "go get <pkg>"
getCmd := exec.Command(goPath, "get", pkgName)
revel.TRACE.Println("Exec:", getCmd.Args)
getOutput, err := getCmd.CombinedOutput()
if err != nil {
revel.ERROR.Println(string(getOutput))
return nil, newCompileError(output)
}
// Success getting the import, attempt to build again.
}
revel.ERROR.Fatalf("Not reachable")
return nil, nil
}