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connector.go
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connector.go
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/*
* Copyright © 2015-2018 Aeneas Rekkas <aeneas+oss@aeneas.io>
*
* 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.
*
* @author Aeneas Rekkas <aeneas+oss@aeneas.io>
* @copyright 2015-2018 Aeneas Rekkas <aeneas+oss@aeneas.io>
* @license Apache-2.0
*/
// Package sqlcon provides helpers for dealing with SQL connectivity.
package sqlcon
import (
"database/sql"
"fmt"
"net/url"
"runtime"
"strconv"
"strings"
"time"
"github.com/ory/x/resilience"
"github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
"github.com/lib/pq"
"github.com/luna-duclos/instrumentedsql"
"github.com/luna-duclos/instrumentedsql/opentracing"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// SQLConnection represents a connection to a SQL database.
type SQLConnection struct {
db *sqlx.DB
URL *url.URL
L logrus.FieldLogger
options
}
// NewSQLConnection returns a new SQLConnection.
func NewSQLConnection(db string, l logrus.FieldLogger, opts ...Opt) (*SQLConnection, error) {
u, err := url.Parse(db)
if err != nil {
return nil, errors.WithStack(err)
}
if l == nil {
logger := logrus.New()
// Basically avoids any logging because no one uses panics
logger.Level = logrus.PanicLevel
l = logger
}
connection := &SQLConnection{
URL: u,
L: l,
}
for _, opt := range opts {
opt(&connection.options)
}
return connection, nil
}
func cleanURLQuery(c *url.URL) *url.URL {
cleanurl := new(url.URL)
*cleanurl = *c
q := cleanurl.Query()
q.Del("max_conns")
q.Del("max_idle_conns")
q.Del("max_conn_lifetime")
q.Del("parseTime")
cleanurl.RawQuery = q.Encode()
return cleanurl
}
// GetDatabaseRetry tries to connect to a database and fails after failAfter.
func (c *SQLConnection) GetDatabaseRetry(maxWait time.Duration, failAfter time.Duration) (*sqlx.DB, error) {
if err := resilience.Retry(c.L, maxWait, failAfter, func() error {
if err := c.GetDatabase().Ping(); err != nil {
return errors.WithStack(err)
}
return nil
}); err != nil {
return nil, errors.WithStack(err)
}
return c.db, nil
}
// GetDatabase retrusn a database instance.
func (c *SQLConnection) GetDatabase() *sqlx.DB {
if c.db != nil {
return c.db
}
var err error
var registeredDriver string
clean := cleanURLQuery(c.URL)
if registeredDriver, err = c.registerDriver(); err != nil {
c.L.Fatalf("Could not register driver: %s", err)
}
if err = resilience.Retry(c.L, time.Second*15, time.Minute*2, func() error {
c.L.Infof("Connecting with %s", c.URL.Scheme+"://*:*@"+c.URL.Host+c.URL.Path+"?"+clean.RawQuery)
u := connectionString(clean)
db, err := sql.Open(registeredDriver, u)
if err != nil {
return errors.Errorf("Could not Connect to SQL: %s", err)
}
c.db = sqlx.NewDb(db, clean.Scheme)
if err := c.db.Ping(); err != nil {
return errors.Errorf("Could not Connect to SQL: %s", err)
}
c.L.Infof("Connected to SQL!")
return nil
}); err != nil {
c.L.Fatalf("Could not Connect to SQL: %s", err)
}
maxConns := maxParallelism() * 2
if v := c.URL.Query().Get("max_conns"); v != "" {
s, err := strconv.ParseInt(v, 10, 64)
if err != nil {
c.L.Warnf("max_conns value %s could not be parsed to int: %s", v, err)
} else {
maxConns = int(s)
}
}
maxIdleConns := maxParallelism()
if v := c.URL.Query().Get("max_idle_conns"); v != "" {
s, err := strconv.ParseInt(v, 10, 64)
if err != nil {
c.L.Warnf("max_idle_conns value %s could not be parsed to int: %s", v, err)
} else {
maxIdleConns = int(s)
}
}
maxConnLifetime := time.Duration(0)
if v := c.URL.Query().Get("max_conn_lifetime"); v != "" {
s, err := time.ParseDuration(v)
if err != nil {
c.L.Warnf("max_conn_lifetime value %s could not be parsed to int: %s", v, err)
} else {
maxConnLifetime = s
}
}
c.db.SetMaxOpenConns(maxConns)
c.db.SetMaxIdleConns(maxIdleConns)
c.db.SetConnMaxLifetime(maxConnLifetime)
return c.db
}
func maxParallelism() int {
maxProcs := runtime.GOMAXPROCS(0)
numCPU := runtime.NumCPU()
if maxProcs < numCPU {
return maxProcs
}
return numCPU
}
func connectionString(clean *url.URL) string {
if clean.Scheme == "mysql" {
q := clean.Query()
q.Set("parseTime", "true")
clean.RawQuery = q.Encode()
}
username := clean.User.Username()
userinfo := username
password, hasPassword := clean.User.Password()
if hasPassword {
userinfo = userinfo + ":" + password
}
clean.User = nil
u := clean.String()
clean.User = url.UserPassword(username, password)
if strings.HasPrefix(u, clean.Scheme+"://") {
u = strings.Replace(u, clean.Scheme+"://", clean.Scheme+"://"+userinfo+"@", 1)
}
if clean.Scheme == "mysql" {
u = strings.Replace(u, "mysql://", "", -1)
}
return u
}
func (c *SQLConnection) registerDriver() (string, error) {
driverName := c.URL.Scheme
if c.UseTracedDriver {
driverName = "instrumented-sql-driver"
if len(c.options.forcedDriverName) > 0 {
driverName = c.options.forcedDriverName
}
tracingOpts := []instrumentedsql.Opt{instrumentedsql.WithTracer(opentracing.NewTracer(c.AllowRoot))}
if c.OmitArgs {
tracingOpts = append(tracingOpts, instrumentedsql.WithOmitArgs())
}
switch c.URL.Scheme {
case "mysql":
sql.Register(driverName,
instrumentedsql.WrapDriver(mysql.MySQLDriver{}, tracingOpts...))
case "postgres":
// Why does this have to be a pointer? Because the Open method for postgres has a pointer receiver
// and does not satisfy the driver.Driver interface.
sql.Register(driverName,
instrumentedsql.WrapDriver(&pq.Driver{}, tracingOpts...))
default:
return "", fmt.Errorf("unsupported scheme (%s) in DSN", c.URL.Scheme)
}
}
return driverName, nil
}