117 lines
3.4 KiB
Go
117 lines
3.4 KiB
Go
// Copyright 2016 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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// Note: this file has tests for code in both delta.go and doubledelta.go --
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// it may make sense to split those out later, but given that the tests are
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// near-identical and share a helper, this feels simpler for now.
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package chunk
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import (
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"bytes"
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"encoding/binary"
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"strings"
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"testing"
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"github.com/prometheus/common/model"
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)
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func TestUnmarshalingCorruptedDeltaReturnsAnError(t *testing.T) {
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var verifyUnmarshallingError = func(
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err error,
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chunkTypeName string,
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unmarshalMethod string,
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expectedStr string,
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) {
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if err == nil {
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t.Errorf("Failed to obtain an error when unmarshalling corrupt %s (from %s)", chunkTypeName, unmarshalMethod)
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return
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}
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if !strings.Contains(err.Error(), expectedStr) {
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t.Errorf(
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"'%s' not present in error when unmarshalling corrupt %s (from %s): '%s'",
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expectedStr,
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chunkTypeName,
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unmarshalMethod,
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err.Error())
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}
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}
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cases := []struct {
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chunkTypeName string
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chunkConstructor func(deltaBytes, deltaBytes, bool, int) Chunk
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minHeaderLen int
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chunkLenPos int
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timeBytesPos int
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}{
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{
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chunkTypeName: "deltaEncodedChunk",
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chunkConstructor: func(a, b deltaBytes, c bool, d int) Chunk {
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return newDeltaEncodedChunk(a, b, c, d)
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},
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minHeaderLen: deltaHeaderBytes,
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chunkLenPos: deltaHeaderBufLenOffset,
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timeBytesPos: deltaHeaderTimeBytesOffset,
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},
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{
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chunkTypeName: "doubleDeltaEncodedChunk",
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chunkConstructor: func(a, b deltaBytes, c bool, d int) Chunk {
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return newDoubleDeltaEncodedChunk(a, b, c, d)
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},
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minHeaderLen: doubleDeltaHeaderMinBytes,
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chunkLenPos: doubleDeltaHeaderBufLenOffset,
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timeBytesPos: doubleDeltaHeaderTimeBytesOffset,
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},
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}
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for _, c := range cases {
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chunk := c.chunkConstructor(d1, d4, false, ChunkLen)
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cs, err := chunk.Add(model.SamplePair{
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Timestamp: model.Now(),
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Value: model.SampleValue(100),
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})
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if err != nil {
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t.Fatalf("Couldn't add sample to empty %s: %s", c.chunkTypeName, err)
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}
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buf := make([]byte, ChunkLen)
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cs[0].MarshalToBuf(buf)
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// Corrupt time byte to 0, which is illegal.
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buf[c.timeBytesPos] = 0
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err = cs[0].UnmarshalFromBuf(buf)
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verifyUnmarshallingError(err, c.chunkTypeName, "buf", "invalid number of time bytes")
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err = cs[0].Unmarshal(bytes.NewBuffer(buf))
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verifyUnmarshallingError(err, c.chunkTypeName, "Reader", "invalid number of time bytes")
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// Fix the corruption to go on.
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buf[c.timeBytesPos] = byte(d1)
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// Corrupt the length to be every possible too-small value
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for i := 0; i < c.minHeaderLen; i++ {
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binary.LittleEndian.PutUint16(buf[c.chunkLenPos:], uint16(i))
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err = cs[0].UnmarshalFromBuf(buf)
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verifyUnmarshallingError(err, c.chunkTypeName, "buf", "header size")
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err = cs[0].Unmarshal(bytes.NewBuffer(buf))
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verifyUnmarshallingError(err, c.chunkTypeName, "Reader", "header size")
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}
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}
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}
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