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// Copyright 2021 The Bazel Authors. All rights reserved.
//
// 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 main
import (
"bufio"
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/url"
"os"
"os/exec"
"path/filepath"
"strings"
)
const (
toolTag = "gopackagesdriver"
)
type Bazel struct {
bazelBin string
workspaceRoot string
bazelStartupFlags []string
info map[string]string
}
// Minimal BEP structs to access the build outputs
type BEPNamedSet struct {
NamedSetOfFiles *struct {
Files []struct {
Name string `json:"name"`
URI string `json:"uri"`
} `json:"files"`
} `json:"namedSetOfFiles"`
}
func NewBazel(ctx context.Context, bazelBin, workspaceRoot string, bazelStartupFlags []string) (*Bazel, error) {
b := &Bazel{
bazelBin: bazelBin,
workspaceRoot: workspaceRoot,
bazelStartupFlags: bazelStartupFlags,
}
if err := b.fillInfo(ctx); err != nil {
return nil, fmt.Errorf("unable to query bazel info: %w", err)
}
return b, nil
}
func (b *Bazel) fillInfo(ctx context.Context) error {
b.info = map[string]string{}
output, err := b.run(ctx, "info")
if err != nil {
return err
}
scanner := bufio.NewScanner(bytes.NewBufferString(output))
for scanner.Scan() {
parts := strings.SplitN(strings.TrimSpace(scanner.Text()), ":", 2)
b.info[strings.TrimSpace(parts[0])] = strings.TrimSpace(parts[1])
}
return nil
}
func (b *Bazel) run(ctx context.Context, command string, args ...string) (string, error) {
defaultArgs := []string{
command,
"--tool_tag=" + toolTag,
"--ui_actions_shown=0",
}
cmd := exec.CommandContext(ctx, b.bazelBin, concatStringsArrays(b.bazelStartupFlags, defaultArgs, args)...)
fmt.Fprintln(os.Stderr, "Running:", cmd.Args)
cmd.Dir = b.WorkspaceRoot()
cmd.Stderr = os.Stderr
output, err := cmd.Output()
return string(output), err
}
func (b *Bazel) Build(ctx context.Context, args ...string) ([]string, error) {
jsonFile, err := ioutil.TempFile("", "gopackagesdriver_bep_")
if err != nil {
return nil, fmt.Errorf("unable to create BEP JSON file: %w", err)
}
defer func() {
jsonFile.Close()
os.Remove(jsonFile.Name())
}()
args = append([]string{
"--show_result=0",
"--build_event_json_file=" + jsonFile.Name(),
"--build_event_json_file_path_conversion=no",
}, args...)
if _, err := b.run(ctx, "build", args...); err != nil {
// Ignore a regular build failure to get partial data.
// See https://docs.bazel.build/versions/main/guide.html#what-exit-code-will-i-get on
// exit codes.
var exerr *exec.ExitError
if !errors.As(err, &exerr) || exerr.ExitCode() != 1 {
return nil, fmt.Errorf("bazel build failed: %w", err)
}
}
files := make([]string, 0)
decoder := json.NewDecoder(jsonFile)
for decoder.More() {
var namedSet BEPNamedSet
if err := decoder.Decode(&namedSet); err != nil {
return nil, fmt.Errorf("unable to decode %s: %w", jsonFile.Name(), err)
}
if namedSet.NamedSetOfFiles != nil {
for _, f := range namedSet.NamedSetOfFiles.Files {
fileUrl, err := url.Parse(f.URI)
if err != nil {
return nil, fmt.Errorf("unable to parse file URI: %w", err)
}
files = append(files, filepath.FromSlash(fileUrl.Path))
}
}
}
return files, nil
}
func (b *Bazel) Query(ctx context.Context, args ...string) ([]string, error) {
output, err := b.run(ctx, "query", args...)
if err != nil {
return nil, fmt.Errorf("bazel query failed: %w", err)
}
trimmedOutput := strings.TrimSpace(output)
if len(trimmedOutput) == 0 {
return nil, nil
}
return strings.Split(trimmedOutput, "\n"), nil
}
func (b *Bazel) WorkspaceRoot() string {
return b.workspaceRoot
}
func (b *Bazel) ExecutionRoot() string {
return b.info["execution_root"]
}
func (b *Bazel) OutputBase() string {
return b.info["output_base"]
}
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