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106 lines
2.7 KiB
106 lines
2.7 KiB
// Copyright 2019 The Prometheus Authors |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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package remote |
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import ( |
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"bytes" |
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"io" |
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"testing" |
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"github.com/stretchr/testify/require" |
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) |
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type mockedFlusher struct { |
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flushed int |
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} |
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func (f *mockedFlusher) Flush() { |
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f.flushed++ |
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} |
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func TestChunkedReaderCanReadFromChunkedWriter(t *testing.T) { |
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b := &bytes.Buffer{} |
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f := &mockedFlusher{} |
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w := NewChunkedWriter(b, f) |
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r := NewChunkedReader(b, 20, nil) |
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msgs := [][]byte{ |
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[]byte("test1"), |
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[]byte("test2"), |
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[]byte("test3"), |
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[]byte("test4"), |
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{}, // This is ignored by writer. |
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[]byte("test5-after-empty"), |
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} |
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for _, msg := range msgs { |
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n, err := w.Write(msg) |
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require.NoError(t, err) |
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require.Len(t, msg, n) |
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} |
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i := 0 |
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for ; i < 4; i++ { |
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msg, err := r.Next() |
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require.NoError(t, err) |
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require.Less(t, i, len(msgs), "more messages then expected") |
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require.Equal(t, msgs[i], msg) |
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} |
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// Empty byte slice is skipped. |
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i++ |
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msg, err := r.Next() |
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require.NoError(t, err) |
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require.Less(t, i, len(msgs), "more messages then expected") |
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require.Equal(t, msgs[i], msg) |
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_, err = r.Next() |
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require.Error(t, err, "expected io.EOF") |
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require.Equal(t, io.EOF, err) |
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require.Equal(t, 5, f.flushed) |
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} |
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func TestChunkedReader_Overflow(t *testing.T) { |
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b := &bytes.Buffer{} |
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_, err := NewChunkedWriter(b, &mockedFlusher{}).Write([]byte("twelve bytes")) |
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require.NoError(t, err) |
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b2 := make([]byte, 12) |
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copy(b2, b.Bytes()) |
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ret, err := NewChunkedReader(b, 12, nil).Next() |
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require.NoError(t, err) |
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require.Equal(t, "twelve bytes", string(ret)) |
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_, err = NewChunkedReader(bytes.NewReader(b2), 11, nil).Next() |
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require.Error(t, err, "expect exceed limit error") |
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require.EqualError(t, err, "chunkedReader: message size exceeded the limit 11 bytes; got: 12 bytes") |
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} |
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func TestChunkedReader_CorruptedFrame(t *testing.T) { |
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b := &bytes.Buffer{} |
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w := NewChunkedWriter(b, &mockedFlusher{}) |
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n, err := w.Write([]byte("test1")) |
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require.NoError(t, err) |
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require.Equal(t, 5, n) |
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bs := b.Bytes() |
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bs[9] = 1 // Malform the frame by changing one byte. |
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_, err = NewChunkedReader(bytes.NewReader(bs), 20, nil).Next() |
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require.Error(t, err, "expected malformed frame") |
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require.EqualError(t, err, "chunkedReader: corrupted frame; checksum mismatch") |
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}
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