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/
config.go
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/
config.go
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package main
import (
"context"
"database/sql"
"fmt"
"io/ioutil"
"time"
goora "github.com/sijms/go-ora/v2"
"gopkg.in/yaml.v3"
)
// Configuration struct.
type Configuration []*Database
// Databases struct.
type Databases struct {
ID string `yaml:"id"`
Queries []Query
}
// Database struct.
type Database struct {
Dsn string
ID string `yaml:"id"`
Host string `yaml:"host"`
User string `yaml:"user"`
Password string `yaml:"password"`
Database string `yaml:"database"`
Port int `yaml:"port"`
Driver string `yaml:"driver"`
MaxIdleCons int `yaml:"maxIdleCons"`
MaxOpenCons int `yaml:"maxOpenCons"`
ConnectString string `yaml:"connectString"`
connection string
pool *sql.DB
}
// Query struct.
type Query struct {
SQL string `yaml:"sql"`
Name string `yaml:"name"`
Interval int `yaml:"interval"`
Timeout int `yaml:"timeout"`
}
func (d *Database) UnmarshalYAML(unmarshal func(interface{}) error) error {
type RawDatabase Database
var defaults = RawDatabase{
Host: "127.0.0.1",
Port: 5432,
Driver: "postgres",
MaxIdleCons: 5,
MaxOpenCons: 5,
ConnectString: "",
}
if err := unmarshal(&defaults); err != nil {
return err
}
*d = Database(defaults)
return nil
}
func (raw *Query) UnmarshalYAML(unmarshal func(interface{}) error) error {
type RawQuery Query
var defaults = RawQuery{
Interval: 1,
Timeout: timeout,
}
if err := unmarshal(&defaults); err != nil {
return err
}
*raw = Query(defaults)
return nil
}
func updateConfig() {
// update configuration from vault
sugar.Info("Read database configuration from Vault")
dbConfig := readVaultValue(vaultConfigName)
sugar.Info("Read database configuration from configMap")
tmpConfiguration := Configuration{}
if err := yaml.Unmarshal([]byte(dbConfig), &tmpConfiguration); err != nil {
sugar.Errorf("Cannot unmarshal key: %v", err)
return
}
// Unmarshal yaml from config
data, err := ioutil.ReadFile(configFile)
if err != nil {
sugar.Errorf("Cannot read config from file: %v", err)
return
}
var databases []Databases
if err := yaml.Unmarshal(data, &databases); err != nil {
sugar.Errorf("Cannot unmarshal config file: %v", err)
return
}
// Clear jobs
scheduler.Stop()
scheduler.Clear()
// Close connections
for _, database := range configuration {
if database.pool != nil {
if err := database.pool.Close(); err != nil {
sugar.Errorf("Cannot close connection to %s : %v", database.Database, err)
}
database.pool = nil
}
}
// Delete all metrics
errorGaugeVec.Reset()
queryGaugeVec.Reset()
durationGaugeVec.Reset()
upGaugeVec.Reset()
configuration = tmpConfiguration
// update connections for pool
for _, database := range configuration {
database.connection = fmt.Sprintf("%s:%d/%s", database.Host, database.Port, database.Database)
// setup connection to database
if database.Driver == "postgres" {
database.Dsn = fmt.Sprintf("user=%s password=%s host=%s port=%d dbname=%s sslmode=disable",
database.User, database.Password, database.Host, database.Port, database.Database)
} else if database.Driver == "oracle" {
database.Dsn = goora.BuildUrl(database.Host,
database.Port, database.Database, database.User, database.Password, nil)
} else {
database.Dsn = fmt.Sprintf("%s:%s@tcp(%s:%d)/%s",
database.User, database.Password, database.Host, database.Port, database.Database)
}
}
for _, database := range databases {
for _, db := range configuration {
if db.ID == database.ID {
// Setup connection
sugar.Infof("Setup connection for DB: %s", db.connection)
db.pool, err = sql.Open(db.Driver, db.Dsn)
if err != nil {
sugar.Errorf("Error on setting connection to database (%s): %v", db.connection, err)
continue
}
db.pool.SetMaxIdleConns(db.MaxIdleCons)
db.pool.SetMaxOpenConns(db.MaxOpenCons)
// Setup ping database
if _, err := scheduler.Every(60).Seconds().Do(pingDB, db); err != nil {
sugar.Errorf("Error on creating job pingDB (%v):, %v", db.Database, err)
}
// Setup queries
for _, query := range database.Queries {
tick := query.Interval * 60
if query.Timeout > tick {
tick = query.Timeout + 10
}
if _, err := scheduler.Every(tick).Seconds().Do(execQuery, db, query); err != nil {
sugar.Errorf("Error creating job %v@%v: %v", db.Database, query.Name, err)
continue
}
}
break
}
}
}
scheduler.StartAsync()
}
func pingDB(database *Database) {
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(pingTimeout)*time.Second)
defer cancel()
if err := database.pool.PingContext(ctx); err != nil {
upGaugeVec.WithLabelValues(database.ID, database.Database).Set(0)
return
}
upGaugeVec.WithLabelValues(database.ID, database.Database).Set(1)
}