prometheus/model/metric_test.go

// Copyright 2013 Prometheus Team
// 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 model

import (
	"github.com/prometheus/prometheus/utility/test"
	"testing"
	"time"
)

func testMetric(t test.Tester) {
	var scenarios = []struct {
		input  map[string]string
		hash   uint64
		rowkey string
	}{
		{
			input:  map[string]string{},
			rowkey: "02676020557754725067--0-",
			hash:   2676020557754725067,
		},
		{
			input: map[string]string{
				"first_name":   "electro",
				"occupation":   "robot",
				"manufacturer": "westinghouse",
			},
			rowkey: "04776841610193542734-f-6-t",
			hash:   4776841610193542734,
		},
		{
			input: map[string]string{
				"x": "y",
			},
			rowkey: "01306929544689993150-x-2-y",
			hash:   1306929544689993150,
		},
	}

	for i, scenario := range scenarios {
		metric := Metric{}
		for key, value := range scenario.input {
			metric[LabelName(key)] = LabelValue(value)
		}

		expectedRowKey := scenario.rowkey
		expectedHash := scenario.hash
		fingerprint := NewFingerprintFromMetric(metric)
		actualRowKey := fingerprint.ToRowKey()
		actualHash := fingerprint.Hash()

		if expectedRowKey != actualRowKey {
			t.Errorf("%d. expected %s, got %s", i, expectedRowKey, actualRowKey)
		}
		if actualHash != expectedHash {
			t.Errorf("%d. expected %d, got %d", i, expectedHash, actualHash)
		}
	}
}

func TestMetric(t *testing.T) {
	testMetric(t)
}

func BenchmarkMetric(b *testing.B) {
	for i := 0; i < b.N; i++ {
		testMetric(b)
	}
}

func testValues(t test.Tester) {
	type in struct {
		values Values
		time   time.Time
	}
	instant := time.Now()
	var scenarios = []struct {
		in  in
		out Values
	}{
		{
			in: in{
				time: instant,
				values: Values{
					{
						Value:     0,
						Timestamp: instant,
					},
					{
						Value:     1,
						Timestamp: instant.Add(time.Second),
					},
					{
						Value:     2,
						Timestamp: instant.Add(2 * time.Second),
					},
					{
						Value:     3,
						Timestamp: instant.Add(3 * time.Second),
					},
					{
						Value:     4,
						Timestamp: instant.Add(4 * time.Second),
					},
				},
			},
			out: Values{
				{
					Value:     0,
					Timestamp: instant,
				},
				{
					Value:     1,
					Timestamp: instant.Add(time.Second),
				},
				{
					Value:     2,
					Timestamp: instant.Add(2 * time.Second),
				},
				{
					Value:     3,
					Timestamp: instant.Add(3 * time.Second),
				},
				{
					Value:     4,
					Timestamp: instant.Add(4 * time.Second),
				},
			},
		},
		{
			in: in{
				time: instant.Add(2 * time.Second),
				values: Values{
					{
						Value:     0,
						Timestamp: instant,
					},
					{
						Value:     1,
						Timestamp: instant.Add(time.Second),
					},
					{
						Value:     2,
						Timestamp: instant.Add(2 * time.Second),
					},
					{
						Value:     3,
						Timestamp: instant.Add(3 * time.Second),
					},
					{
						Value:     4,
						Timestamp: instant.Add(4 * time.Second),
					},
				},
			},
			out: Values{
				{
					Value:     1,
					Timestamp: instant.Add(time.Second),
				},
				{
					Value:     2,
					Timestamp: instant.Add(2 * time.Second),
				},
				{
					Value:     3,
					Timestamp: instant.Add(3 * time.Second),
				},
				{
					Value:     4,
					Timestamp: instant.Add(4 * time.Second),
				},
			},
		},
		{
			in: in{
				time: instant.Add(5 * time.Second),
				values: Values{
					{
						Value:     0,
						Timestamp: instant,
					},
					{
						Value:     1,
						Timestamp: instant.Add(time.Second),
					},
					{
						Value:     2,
						Timestamp: instant.Add(2 * time.Second),
					},
					{
						Value:     3,
						Timestamp: instant.Add(3 * time.Second),
					},
					{
						Value:     4,
						Timestamp: instant.Add(4 * time.Second),
					},
				},
			},
			out: Values{
				// Preserve the last value in case it needs to be used for the next set.
				{
					Value:     4,
					Timestamp: instant.Add(4 * time.Second),
				},
			},
		},
	}

	for i, scenario := range scenarios {
		actual := scenario.in.values.TruncateBefore(scenario.in.time)

		if len(actual) != len(scenario.out) {
			t.Fatalf("%d. expected length of %d, got %d", i, len(scenario.out), len(actual))
		}

		for j, actualValue := range actual {
			if !actualValue.Equal(scenario.out[j]) {
				t.Fatalf("%d.%d. expected %s, got %s", i, j, scenario.out[j], actualValue)
			}
		}
	}
}

func TestValues(t *testing.T) {
	testValues(t)
}