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// Copyright 2024 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 langu
package main
import (
"testing"
"log/slog"
"github.com/DATA-DOG/go-sqlmock"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
"github.com/smartystreets/goconvey/convey"
)
type labelMap map[string]string
type MetricResult struct {
labels labelMap
value float64
metricType dto.MetricType
}
func readMetric(m prometheus.Metric) MetricResult {
pb := &dto.Metric{}
m.Write(pb)
labels := make(labelMap, len(pb.Label))
for _, v := range pb.Label {
labels[v.GetName()] = v.GetValue()
}
if pb.Gauge != nil {
return MetricResult{labels: labels, value: pb.GetGauge().GetValue(), metricType: dto.MetricType_GAUGE}
}
if pb.Counter != nil {
return MetricResult{labels: labels, value: pb.GetCounter().GetValue(), metricType: dto.MetricType_COUNTER}
}
if pb.Untyped != nil {
return MetricResult{labels: labels, value: pb.GetUntyped().GetValue(), metricType: dto.MetricType_UNTYPED}
}
panic("Unsupported metric type")
}
func TestQueryShowList(t *testing.T) {
db, mock, err := sqlmock.New()
if err != nil {
t.Fatalf("Error opening a stub db connection: %s", err)
}
defer db.Close()
rows := sqlmock.NewRows([]string{"key", "value"}).
AddRow("dns_queries", -1).
AddRow("databases", 1).
AddRow("pools", 0).
AddRow("users", 2)
mock.ExpectQuery("SHOW LISTS;").WillReturnRows(rows)
logger := &slog.Logger{}
ch := make(chan prometheus.Metric)
go func() {
defer close(ch)
if err := queryShowLists(ch, db, logger); err != nil {
t.Errorf("Error running queryShowList: %s", err)
}
}()
expected := []MetricResult{
{labels: labelMap{}, metricType: dto.MetricType_GAUGE, value: -1},
{labels: labelMap{}, metricType: dto.MetricType_GAUGE, value: 1},
{labels: labelMap{}, metricType: dto.MetricType_GAUGE, value: 0},
{labels: labelMap{}, metricType: dto.MetricType_GAUGE, value: 2},
}
convey.Convey("Metrics comparison", t, func() {
for _, expect := range expected {
m := readMetric(<-ch)
convey.So(expect, convey.ShouldResemble, m)
}
})
if err := mock.ExpectationsWereMet(); err != nil {
t.Errorf("there were unfulfilled exceptions: %s", err)
}
}
func TestQueryShowConfig(t *testing.T) {
db, mock, err := sqlmock.New()
if err != nil {
t.Fatalf("Error opening a stub db connection: %s", err)
}
defer db.Close()
rows := sqlmock.NewRows([]string{"key", "value", "default", "changeable"}).
AddRow("max_client_conn", 1900, 100, true).
AddRow("max_user_connections", 100, 100, true).
AddRow("auth_type", "md5", "md5", true).
AddRow("client_tls_ciphers", "default", "default", "yes")
mock.ExpectQuery("SHOW CONFIG;").WillReturnRows(rows)
logger := &slog.Logger{}
ch := make(chan prometheus.Metric)
go func() {
defer close(ch)
if err := queryShowConfig(ch, db, logger); err != nil {
t.Errorf("Error running queryShowConfig: %s", err)
}
}()
expected := []MetricResult{
{labels: labelMap{}, metricType: dto.MetricType_GAUGE, value: 1900},
{labels: labelMap{}, metricType: dto.MetricType_GAUGE, value: 100},
}
convey.Convey("Metrics comparison", t, func() {
for _, expect := range expected {
m := readMetric(<-ch)
convey.So(expect, convey.ShouldResemble, m)
}
})
if err := mock.ExpectationsWereMet(); err != nil {
t.Errorf("there were unfulfilled exceptions: %s", err)
}
}
func TestQueryShowDatabases(t *testing.T) {
rows := sqlmock.NewRows([]string{"name", "host", "port", "database", "pool_size"}).
AddRow("pg0_db", "10.10.10.1", "5432", "pg0", 20)
expected := []MetricResult{
{labels: labelMap{"name": "pg0_db", "host": "10.10.10.1", "port": "5432", "database": "pg0", "force_user": "", "pool_mode": ""}, metricType: dto.MetricType_GAUGE, value: 20},
}
testQueryNamespaceMapping(t, "databases", rows, expected)
}
func TestQueryShowStats(t *testing.T) {
// columns are listed in the order PgBouncers exposes them, a value of -1 means pgbouncer_exporter does not expose this value as a metric
rows := sqlmock.NewRows([]string{"database",
"server_assignment_count",
"xact_count", "query_count", "bytes_received", "bytes_sent",
"xact_time", "query_time", "wait_time", "client_parse_count", "server_parse_count", "bind_count"}).
AddRow("pg0", -1, 10, 40, 220, 460, 6, 8, 9, 5, 55, 555)
// expected metrics are returned in the same order as the colums
expected := []MetricResult{
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 10}, // xact_count
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 40}, // query_count
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 220}, // bytes_received
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 460}, // bytes_sent
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 6e-6}, // xact_time
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 8e-6}, // query_time
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 9e-6}, // wait_time
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 5}, // client_parse_count
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 55}, // server_parse_count
{labels: labelMap{"database": "pg0"}, metricType: dto.MetricType_COUNTER, value: 555}, // bind_count
}
testQueryNamespaceMapping(t, "stats_totals", rows, expected)
}
func TestQueryShowPools(t *testing.T) {
rows := sqlmock.NewRows([]string{"database", "user", "cl_active"}).
AddRow("pg0", "postgres", 2)
expected := []MetricResult{
{labels: labelMap{"database": "pg0", "user": "postgres"}, metricType: dto.MetricType_GAUGE, value: 2},
}
testQueryNamespaceMapping(t, "pools", rows, expected)
}
func testQueryNamespaceMapping(t *testing.T, namespaceMapping string, rows *sqlmock.Rows, expected []MetricResult) {
db, mock, err := sqlmock.New()
if err != nil {
t.Fatalf("Error opening a stub db connection: %s", err)
}
defer db.Close()
mock.ExpectQuery("SHOW " + namespaceMapping + ";").WillReturnRows(rows)
logger := slog.Default()
metricMap := makeDescMap(metricMaps, namespace, logger)
ch := make(chan prometheus.Metric)
go func() {
defer close(ch)
if _, err := queryNamespaceMapping(ch, db, namespaceMapping, metricMap[namespaceMapping], logger); err != nil {
t.Errorf("Error running queryNamespaceMapping: %s", err)
}
}()
convey.Convey("Metrics comparison", t, func() {
for _, expect := range expected {
m := readMetric(<-ch)
convey.So(m, convey.ShouldResemble, expect)
}
})
if err := mock.ExpectationsWereMet(); err != nil {
t.Errorf("there were unfulfilled exceptions: %s", err)
}
}
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