| // Copyright 2020 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 bzltestutil |
| |
| import ( |
| "bufio" |
| "bytes" |
| "fmt" |
| "io" |
| "io/ioutil" |
| "log" |
| "os" |
| "os/exec" |
| "os/signal" |
| "path/filepath" |
| "strconv" |
| "strings" |
| "sync" |
| "syscall" |
| |
| "github.com/bazelbuild/rules_go/go/tools/bzltestutil/chdir" |
| ) |
| |
| // TestWrapperAbnormalExit is used by Wrap to indicate the child |
| // process exitted without an exit code (for example being killed by a signal). |
| // We use 6, in line with Bazel's RUN_FAILURE. |
| const TestWrapperAbnormalExit = 6 |
| |
| func ShouldWrap() bool { |
| if wrapEnv, ok := os.LookupEnv("GO_TEST_WRAP"); ok { |
| wrap, err := strconv.ParseBool(wrapEnv) |
| if err != nil { |
| log.Fatalf("invalid value for GO_TEST_WRAP: %q", wrapEnv) |
| } |
| return wrap |
| } |
| _, ok := os.LookupEnv("XML_OUTPUT_FILE") |
| return ok |
| } |
| |
| // shouldAddTestV indicates if the test wrapper should prepend a -test.v flag to |
| // the test args. This is required to get information about passing tests from |
| // test2json for complete XML reports. |
| func shouldAddTestV() bool { |
| if wrapEnv, ok := os.LookupEnv("GO_TEST_WRAP_TESTV"); ok { |
| wrap, err := strconv.ParseBool(wrapEnv) |
| if err != nil { |
| log.Fatalf("invalid value for GO_TEST_WRAP_TESTV: %q", wrapEnv) |
| } |
| return wrap |
| } |
| return false |
| } |
| |
| // streamMerger intelligently merges an input stdout and stderr stream and dumps |
| // the output to the writer `inner`. Additional synchronization is applied to |
| // ensure that one line at a time is written to the inner writer. |
| type streamMerger struct { |
| OutW, ErrW *io.PipeWriter |
| mutex sync.Mutex |
| inner io.Writer |
| wg sync.WaitGroup |
| outR, errR *bufio.Reader |
| } |
| |
| func NewStreamMerger(w io.Writer) *streamMerger { |
| outR, outW := io.Pipe() |
| errR, errW := io.Pipe() |
| return &streamMerger{ |
| inner: w, |
| OutW: outW, |
| ErrW: errW, |
| outR: bufio.NewReader(outR), |
| errR: bufio.NewReader(errR), |
| } |
| } |
| |
| func (m *streamMerger) Start() { |
| m.wg.Add(2) |
| process := func(r *bufio.Reader) { |
| for { |
| s, err := r.ReadString('\n') |
| if len(s) > 0 { |
| m.mutex.Lock() |
| io.WriteString(m.inner, s) |
| m.mutex.Unlock() |
| } |
| if err == io.EOF { |
| break |
| } |
| } |
| m.wg.Done() |
| } |
| go process(m.outR) |
| go process(m.errR) |
| } |
| |
| func (m *streamMerger) Wait() { |
| m.wg.Wait() |
| } |
| |
| func Wrap(pkg string) error { |
| var jsonBuffer bytes.Buffer |
| jsonConverter := NewConverter(&jsonBuffer, pkg, Timestamp) |
| streamMerger := NewStreamMerger(jsonConverter) |
| |
| args := os.Args[1:] |
| if shouldAddTestV() { |
| args = append([]string{"-test.v"}, args...) |
| } |
| exePath := os.Args[0] |
| if !filepath.IsAbs(exePath) && strings.ContainsRune(exePath, filepath.Separator) && chdir.TestExecDir != "" { |
| exePath = filepath.Join(chdir.TestExecDir, exePath) |
| } |
| |
| // If Bazel sends a SIGTERM because the test timed out, it sends it to all child processes. However, |
| // we want the wrapper to be around to capute and forward the test output when this happens. Thus, |
| // we need to ignore the signal. This wrapper will natually ends after the Go test ends, either by |
| // SIGTERM or the time set by -test.timeout expires. If that doesn't happen, the test and this warpper |
| // will be killed by Bazel after the grace period (15s) expires. |
| signal.Ignore(syscall.SIGTERM) |
| |
| cmd := exec.Command(exePath, args...) |
| cmd.Env = append(os.Environ(), "GO_TEST_WRAP=0") |
| cmd.Stderr = io.MultiWriter(os.Stderr, streamMerger.ErrW) |
| cmd.Stdout = io.MultiWriter(os.Stdout, streamMerger.OutW) |
| streamMerger.Start() |
| err := cmd.Run() |
| streamMerger.ErrW.Close() |
| streamMerger.OutW.Close() |
| streamMerger.Wait() |
| jsonConverter.Close() |
| if out, ok := os.LookupEnv("XML_OUTPUT_FILE"); ok { |
| werr := writeReport(jsonBuffer, pkg, out) |
| if werr != nil { |
| if err != nil { |
| return fmt.Errorf("error while generating testreport: %s, (error wrapping test execution: %s)", werr, err) |
| } |
| return fmt.Errorf("error while generating testreport: %s", werr) |
| } |
| } |
| return err |
| } |
| |
| func writeReport(jsonBuffer bytes.Buffer, pkg string, path string) error { |
| xml, cerr := json2xml(&jsonBuffer, pkg) |
| if cerr != nil { |
| return fmt.Errorf("error converting test output to xml: %s", cerr) |
| } |
| if err := ioutil.WriteFile(path, xml, 0664); err != nil { |
| return fmt.Errorf("error writing test xml: %s", err) |
| } |
| return nil |
| } |