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Merge pull request docker#2656 from tonistiigi/repl-stdin
build: allow builds from stdin for multi-node builders
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| package build | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "bytes" | ||
| "io" | ||
| "sync" | ||
| ) | ||
|
|
||
| type SyncMultiReader struct { | ||
| source *bufio.Reader | ||
| buffer []byte | ||
| static []byte | ||
| mu sync.Mutex | ||
| cond *sync.Cond | ||
| readers []*syncReader | ||
| err error | ||
| offset int | ||
| } | ||
|
|
||
| type syncReader struct { | ||
| mr *SyncMultiReader | ||
| offset int | ||
| closed bool | ||
| } | ||
|
|
||
| func NewSyncMultiReader(source io.Reader) *SyncMultiReader { | ||
| mr := &SyncMultiReader{ | ||
| source: bufio.NewReader(source), | ||
| buffer: make([]byte, 0, 32*1024), | ||
| } | ||
| mr.cond = sync.NewCond(&mr.mu) | ||
| return mr | ||
| } | ||
|
|
||
| func (mr *SyncMultiReader) Peek(n int) ([]byte, error) { | ||
| mr.mu.Lock() | ||
| defer mr.mu.Unlock() | ||
|
|
||
| if mr.static != nil { | ||
| return mr.static[min(n, len(mr.static)):], nil | ||
| } | ||
|
|
||
| return mr.source.Peek(n) | ||
| } | ||
|
|
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| func (mr *SyncMultiReader) Reset(dt []byte) { | ||
| mr.mu.Lock() | ||
| defer mr.mu.Unlock() | ||
|
|
||
| mr.static = dt | ||
| } | ||
|
|
||
| func (mr *SyncMultiReader) NewReadCloser() io.ReadCloser { | ||
| mr.mu.Lock() | ||
| defer mr.mu.Unlock() | ||
|
|
||
| if mr.static != nil { | ||
| return io.NopCloser(bytes.NewReader(mr.static)) | ||
| } | ||
|
|
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| reader := &syncReader{ | ||
| mr: mr, | ||
| } | ||
| mr.readers = append(mr.readers, reader) | ||
| return reader | ||
| } | ||
|
|
||
| func (sr *syncReader) Read(p []byte) (int, error) { | ||
| sr.mr.mu.Lock() | ||
| defer sr.mr.mu.Unlock() | ||
|
|
||
| return sr.read(p) | ||
| } | ||
|
|
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| func (sr *syncReader) read(p []byte) (int, error) { | ||
| end := sr.mr.offset + len(sr.mr.buffer) | ||
|
|
||
| loop0: | ||
| for { | ||
| if sr.closed { | ||
| return 0, io.EOF | ||
| } | ||
|
|
||
| end := sr.mr.offset + len(sr.mr.buffer) | ||
|
|
||
| if sr.mr.err != nil && sr.offset == end { | ||
| return 0, sr.mr.err | ||
| } | ||
|
|
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| start := sr.offset - sr.mr.offset | ||
|
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| dt := sr.mr.buffer[start:] | ||
|
|
||
| if len(dt) > 0 { | ||
| n := copy(p, dt) | ||
| sr.offset += n | ||
| sr.mr.cond.Broadcast() | ||
| return n, nil | ||
| } | ||
|
|
||
| // check for readers that have not caught up | ||
| hasOpen := false | ||
| for _, r := range sr.mr.readers { | ||
| if !r.closed { | ||
| hasOpen = true | ||
| } else { | ||
| continue | ||
| } | ||
| if r.offset < end { | ||
| sr.mr.cond.Wait() | ||
| continue loop0 | ||
| } | ||
| } | ||
|
|
||
| if !hasOpen { | ||
| return 0, io.EOF | ||
| } | ||
| break | ||
| } | ||
|
|
||
| last := sr.mr.offset + len(sr.mr.buffer) | ||
| // another reader has already updated the buffer | ||
| if last > end || sr.mr.err != nil { | ||
| return sr.read(p) | ||
| } | ||
|
|
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| sr.mr.offset += len(sr.mr.buffer) | ||
|
|
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| sr.mr.buffer = sr.mr.buffer[:cap(sr.mr.buffer)] | ||
| n, err := sr.mr.source.Read(sr.mr.buffer) | ||
| if n >= 0 { | ||
| sr.mr.buffer = sr.mr.buffer[:n] | ||
| } else { | ||
| sr.mr.buffer = sr.mr.buffer[:0] | ||
| } | ||
|
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| sr.mr.cond.Broadcast() | ||
|
|
||
| if err != nil { | ||
| sr.mr.err = err | ||
| return 0, err | ||
| } | ||
|
|
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| nn := copy(p, sr.mr.buffer) | ||
| sr.offset += nn | ||
|
|
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| return nn, nil | ||
| } | ||
|
|
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| func (sr *syncReader) Close() error { | ||
| sr.mr.mu.Lock() | ||
| defer sr.mr.mu.Unlock() | ||
|
|
||
| if sr.closed { | ||
| return nil | ||
| } | ||
|
|
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| sr.closed = true | ||
|
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| sr.mr.cond.Broadcast() | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package build | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "io" | ||
| mathrand "math/rand" | ||
| "sync" | ||
| "testing" | ||
| "time" | ||
|
|
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| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func generateRandomData(size int) []byte { | ||
| data := make([]byte, size) | ||
| rand.Read(data) | ||
| return data | ||
| } | ||
| func TestSyncMultiReaderParallel(t *testing.T) { | ||
| data := generateRandomData(1024 * 1024) | ||
| source := bytes.NewReader(data) | ||
| mr := NewSyncMultiReader(source) | ||
|
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| var wg sync.WaitGroup | ||
| numReaders := 10 | ||
| bufferSize := 4096 * 4 | ||
|
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| readers := make([]io.ReadCloser, numReaders) | ||
|
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| for i := 0; i < numReaders; i++ { | ||
| readers[i] = mr.NewReadCloser() | ||
| } | ||
|
|
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| for i := 0; i < numReaders; i++ { | ||
| wg.Add(1) | ||
| go func(readerId int) { | ||
| defer wg.Done() | ||
| reader := readers[readerId] | ||
| defer reader.Close() | ||
|
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| totalRead := 0 | ||
| buf := make([]byte, bufferSize) | ||
| for totalRead < len(data) { | ||
| // Simulate random read sizes | ||
| readSize := mathrand.Intn(bufferSize) //nolint:gosec | ||
| n, err := reader.Read(buf[:readSize]) | ||
|
|
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| if n > 0 { | ||
| assert.Equal(t, data[totalRead:totalRead+n], buf[:n], "Reader %d mismatch", readerId) | ||
| totalRead += n | ||
| } | ||
|
|
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| if err == io.EOF { | ||
| assert.Equal(t, len(data), totalRead, "Reader %d EOF mismatch", readerId) | ||
| return | ||
| } | ||
|
|
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| require.NoError(t, err, "Reader %d error", readerId) | ||
|
|
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| if mathrand.Intn(1000) == 0 { //nolint:gosec | ||
| t.Logf("Reader %d closing", readerId) | ||
| // Simulate random close | ||
| return | ||
| } | ||
|
|
||
| // Simulate random timing between reads | ||
| time.Sleep(time.Millisecond * time.Duration(mathrand.Intn(5))) //nolint:gosec | ||
| } | ||
|
|
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| assert.Equal(t, len(data), totalRead, "Reader %d total read mismatch", readerId) | ||
| }(i) | ||
| } | ||
|
|
||
| wg.Wait() | ||
| } |
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