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107 lines
2.7 KiB
107 lines
2.7 KiB
5 years ago
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// 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/prometheus/prometheus/util/testutil"
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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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[]byte{}, // 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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testutil.Ok(t, err)
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testutil.Equals(t, len(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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testutil.Ok(t, err)
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testutil.Assert(t, i < len(msgs), "more messages then expected")
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testutil.Equals(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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testutil.Ok(t, err)
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testutil.Assert(t, i < len(msgs), "more messages then expected")
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testutil.Equals(t, msgs[i], msg)
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_, err = r.Next()
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testutil.NotOk(t, err, "expected io.EOF")
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testutil.Equals(t, io.EOF, err)
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testutil.Equals(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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testutil.Ok(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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testutil.Ok(t, err)
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testutil.Equals(t, "twelve bytes", string(ret))
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_, err = NewChunkedReader(bytes.NewReader(b2), 11, nil).Next()
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testutil.NotOk(t, err, "expect exceed limit error")
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testutil.Equals(t, "chunkedReader: message size exceeded the limit 11 bytes; got: 12 bytes", err.Error())
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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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testutil.Ok(t, err)
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testutil.Equals(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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testutil.NotOk(t, err, "expected malformed frame")
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testutil.Equals(t, "chunkedReader: corrupted frame; checksum mismatch", err.Error())
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}
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