forked from palantir/godel
/
run.go
122 lines (109 loc) · 3.69 KB
/
run.go
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// Copyright 2016 Palantir Technologies, Inc.
//
// Licensed 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 run
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"strings"
"github.com/pkg/errors"
"github.com/palantir/godel/apps/distgo/params"
)
func DoRun(buildSpec params.ProductBuildSpec, runArgs []string, stdout, stderr io.Writer) error {
mainPkgDir := path.Join(buildSpec.ProjectDir, buildSpec.Build.MainPkg)
mainPkgFileNames, err := mainPkgFileNames(mainPkgDir)
if err != nil {
return errors.Wrapf(err, "failed to find main file")
}
cmd := exec.Command("go")
args := []string{cmd.Path, "run"}
for _, name := range mainPkgFileNames {
args = append(args, path.Join(buildSpec.ProjectDir, buildSpec.Build.MainPkg, name))
}
args = append(args, buildSpec.Run.Args...)
args = append(args, transformRunFlagArgs(runArgs)...)
cmd.Args = args
cmd.Stdout = stdout
cmd.Stderr = stderr
cmd.Stdin = os.Stdin
fmt.Fprintln(stdout, strings.Join(args, " "))
if err := cmd.Run(); err != nil {
return errors.Wrapf(err, "go run failed")
}
return nil
}
func transformRunFlagArgs(args []string) []string {
const flagPrefix = "flag:"
var newArgs []string
for _, currArg := range args {
// if current argument has flag prefix and has content after the prefix, trim the prefix
if strings.HasPrefix(currArg, flagPrefix) && len(currArg) > len(flagPrefix) {
currArg = strings.TrimPrefix(currArg, flagPrefix)
}
newArgs = append(newArgs, currArg)
}
return newArgs
}
// getMainPkgFiles returns the names of all of the files in the "main" pkg of the specified directory. Returns an error
// if there are no files in the "main" package that declares a "main" function (or if there are multiple such files).
func mainPkgFileNames(mainPkgDir string) ([]string, error) {
fileInfos, err := ioutil.ReadDir(mainPkgDir)
if err != nil {
return nil, errors.Wrapf(err, "failed to list files in directory %v", mainPkgDir)
}
var mainPkgFileNames []string
var mainFuncFileNames []string
for _, currFile := range fileInfos {
currFilePath := path.Join(mainPkgDir, currFile.Name())
if !currFile.IsDir() && strings.HasSuffix(currFile.Name(), ".go") && !strings.HasSuffix(currFile.Name(), "_test.go") {
fset := token.NewFileSet()
fnode, err := parser.ParseFile(fset, currFilePath, nil, parser.ParseComments)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse file %v", currFilePath)
}
// find main package
if fnode.Name.Name == "main" {
mainPkgFileNames = append(mainPkgFileNames, currFile.Name())
if hasMainFunc(fnode) {
mainFuncFileNames = append(mainFuncFileNames, currFile.Name())
}
}
}
}
switch len(mainFuncFileNames) {
case 0:
return nil, errors.Errorf("no go file with main package and main function exists in directory %v", mainPkgDir)
case 1:
return mainPkgFileNames, nil
default:
return nil, errors.Errorf("directory %v contain multiple files that have main package and main function: %v", mainPkgDir, mainFuncFileNames)
}
}
func hasMainFunc(node *ast.File) bool {
for _, currDecl := range node.Decls {
switch t := currDecl.(type) {
case *ast.FuncDecl:
if t.Name.Name == "main" {
return true
}
}
}
return false
}