prometheus/storage/local/delta_test.go
2016-08-30 07:57:39 -04:00

104 lines
2.9 KiB
Go

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