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run.go
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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/palantir/distgo/distgo"
"github.com/pkg/errors"
)
func Product(projectInfo distgo.ProjectInfo, productParam distgo.ProductParam, runArgs []string, stdout, stderr io.Writer) error {
if productParam.Build == nil {
return errors.Errorf("product %s has no build configuration defined", productParam.ID)
}
mainPkgDir := path.Join(projectInfo.ProjectDir, productParam.Build.MainPkg)
mainPkgGoFiles, err := mainPkgGoFiles(mainPkgDir)
if err != nil {
return errors.Wrapf(err, "failed to find Go files for main package")
}
cmd := exec.Command("go")
args := []string{cmd.Path, "run"}
// add build arguments for product
productTaskOutputInfo, err := distgo.ToProductTaskOutputInfo(projectInfo, productParam)
if err != nil {
return errors.Wrapf(err, "failed to compute output info")
}
buildArgs, err := productParam.Build.BuildArgs(productTaskOutputInfo)
if err != nil {
return err
}
args = append(args, buildArgs...)
for _, goFiles := range mainPkgGoFiles {
args = append(args, path.Join(mainPkgDir, goFiles))
}
if productParam.Run != nil {
args = append(args, productParam.Run.Args...)
}
args = append(args, 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
}
// mainPkgGoFiles returns the names of all of the non-test Go 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 mainPkgGoFiles(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
}