prometheus/promql/query_logger_test.go
johncming 1c1b394e5e
promql: Swap order of parseBrokenJSON. (#7718)
Signed-off-by: johncming <johncming@yahoo.com>
2020-08-02 09:48:57 +01:00

176 lines
5.4 KiB
Go

// Copyright 2019 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.
package promql
import (
"context"
"io/ioutil"
"os"
"regexp"
"testing"
"github.com/prometheus/prometheus/util/testutil"
)
func TestQueryLogging(t *testing.T) {
fileAsBytes := make([]byte, 4096)
queryLogger := ActiveQueryTracker{
mmapedFile: fileAsBytes,
logger: nil,
getNextIndex: make(chan int, 4),
}
queryLogger.generateIndices(4)
veryLongString := "MassiveQueryThatNeverEndsAndExceedsTwoHundredBytesWhichIsTheSizeOfEntrySizeAndShouldThusBeTruncatedAndIamJustGoingToRepeatTheSameCharactersAgainProbablyBecauseWeAreStillOnlyHalfWayDoneOrMaybeNotOrMaybeMassiveQueryThatNeverEndsAndExceedsTwoHundredBytesWhichIsTheSizeOfEntrySizeAndShouldThusBeTruncatedAndIamJustGoingToRepeatTheSameCharactersAgainProbablyBecauseWeAreStillOnlyHalfWayDoneOrMaybeNotOrMaybeMassiveQueryThatNeverEndsAndExceedsTwoHundredBytesWhichIsTheSizeOfEntrySizeAndShouldThusBeTruncatedAndIamJustGoingToRepeatTheSameCharactersAgainProbablyBecauseWeAreStillOnlyHalfWayDoneOrMaybeNotOrMaybeMassiveQueryThatNeverEndsAndExceedsTwoHundredBytesWhichIsTheSizeOfEntrySizeAndShouldThusBeTruncatedAndIamJustGoingToRepeatTheSameCharactersAgainProbablyBecauseWeAreStillOnlyHalfWayDoneOrMaybeNotOrMaybeMassiveQueryThatNeverEndsAndExceedsTwoHundredBytesWhichIsTheSizeOfEntrySizeAndShouldThusBeTruncatedAndIamJustGoingToRepeatTheSameCharactersAgainProbablyBecauseWeAreStillOnlyHalfWayDoneOrMaybeNotOrMaybe"
queries := []string{
"TestQuery",
veryLongString,
"",
"SpecialCharQuery{host=\"2132132\", id=123123}",
}
want := []string{
`^{"query":"TestQuery","timestamp_sec":\d+}\x00*,$`,
`^{"query":"` + trimStringByBytes(veryLongString, entrySize-40) + `","timestamp_sec":\d+}\x00*,$`,
`^{"query":"","timestamp_sec":\d+}\x00*,$`,
`^{"query":"SpecialCharQuery{host=\\"2132132\\", id=123123}","timestamp_sec":\d+}\x00*,$`,
}
// Check for inserts of queries.
for i := 0; i < 4; i++ {
start := 1 + i*entrySize
end := start + entrySize
queryLogger.Insert(context.Background(), queries[i])
have := string(fileAsBytes[start:end])
if !regexp.MustCompile(want[i]).MatchString(have) {
t.Fatalf("Query not written correctly: %s.\nHave %s\nWant %s", queries[i], have, want[i])
}
}
// Check if all queries have been deleted.
for i := 0; i < 4; i++ {
queryLogger.Delete(1 + i*entrySize)
}
if !regexp.MustCompile(`^\x00+$`).Match(fileAsBytes[1 : 1+entrySize*4]) {
t.Fatalf("All queries not deleted properly. Have %s\nWant only null bytes \\x00", string(fileAsBytes[1:1+entrySize*4]))
}
}
func TestIndexReuse(t *testing.T) {
queryBytes := make([]byte, 1+3*entrySize)
queryLogger := ActiveQueryTracker{
mmapedFile: queryBytes,
logger: nil,
getNextIndex: make(chan int, 3),
}
queryLogger.generateIndices(3)
queryLogger.Insert(context.Background(), "TestQuery1")
queryLogger.Insert(context.Background(), "TestQuery2")
queryLogger.Insert(context.Background(), "TestQuery3")
queryLogger.Delete(1 + entrySize)
queryLogger.Delete(1)
newQuery2 := "ThisShouldBeInsertedAtIndex2"
newQuery1 := "ThisShouldBeInsertedAtIndex1"
queryLogger.Insert(context.Background(), newQuery2)
queryLogger.Insert(context.Background(), newQuery1)
want := []string{
`^{"query":"ThisShouldBeInsertedAtIndex1","timestamp_sec":\d+}\x00*,$`,
`^{"query":"ThisShouldBeInsertedAtIndex2","timestamp_sec":\d+}\x00*,$`,
`^{"query":"TestQuery3","timestamp_sec":\d+}\x00*,$`,
}
// Check all bytes and verify new query was inserted at index 2
for i := 0; i < 3; i++ {
start := 1 + i*entrySize
end := start + entrySize
have := queryBytes[start:end]
if !regexp.MustCompile(want[i]).Match(have) {
t.Fatalf("Index not reused properly:\nHave %s\nWant %s", string(queryBytes[start:end]), want[i])
}
}
}
func TestMMapFile(t *testing.T) {
file, err := ioutil.TempFile("", "mmapedFile")
testutil.Ok(t, err)
filename := file.Name()
defer os.Remove(filename)
fileAsBytes, err := getMMapedFile(filename, 2, nil)
testutil.Ok(t, err)
copy(fileAsBytes, "ab")
f, err := os.Open(filename)
testutil.Ok(t, err)
bytes := make([]byte, 4)
n, err := f.Read(bytes)
if n != 2 || err != nil {
t.Fatalf("Error reading file")
}
if string(bytes[:2]) != string(fileAsBytes) {
t.Fatalf("Mmap failed")
}
}
func TestParseBrokenJSON(t *testing.T) {
for _, tc := range []struct {
b []byte
ok bool
out string
}{
{
b: []byte(""),
},
{
b: []byte("\x00\x00"),
},
{
b: []byte("\x00[\x00"),
},
{
b: []byte("\x00[]\x00"),
ok: true,
out: "[]",
},
{
b: []byte("[\"up == 0\",\"rate(http_requests[2w]\"]\x00\x00\x00"),
ok: true,
out: "[\"up == 0\",\"rate(http_requests[2w]\"]",
},
} {
t.Run("", func(t *testing.T) {
out, ok := parseBrokenJSON(tc.b)
if tc.ok != ok {
t.Fatalf("expected %t, got %t", tc.ok, ok)
return
}
if ok && tc.out != out {
t.Fatalf("expected %s, got %s", tc.out, out)
}
})
}
}