telegraf/plugins/inputs/postgresql/connect.go

100 lines
2.1 KiB
Go

package postgresql
import (
"database/sql"
"fmt"
"net"
"net/url"
"sort"
"strings"
"github.com/jackc/pgx"
"github.com/jackc/pgx/stdlib"
)
// pulled from lib/pq
// ParseURL no longer needs to be used by clients of this library since supplying a URL as a
// connection string to sql.Open() is now supported:
//
// sql.Open("postgres", "postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full")
//
// It remains exported here for backwards-compatibility.
//
// ParseURL converts a url to a connection string for driver.Open.
// Example:
//
// "postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full"
//
// converts to:
//
// "user=bob password=secret host=1.2.3.4 port=5432 dbname=mydb sslmode=verify-full"
//
// A minimal example:
//
// "postgres://"
//
// This will be blank, causing driver.Open to use all of the defaults
func ParseURL(uri string) (string, error) {
u, err := url.Parse(uri)
if err != nil {
return "", err
}
if u.Scheme != "postgres" && u.Scheme != "postgresql" {
return "", fmt.Errorf("invalid connection protocol: %s", u.Scheme)
}
var kvs []string
escaper := strings.NewReplacer(` `, `\ `, `'`, `\'`, `\`, `\\`)
accrue := func(k, v string) {
if v != "" {
kvs = append(kvs, k+"="+escaper.Replace(v))
}
}
if u.User != nil {
v := u.User.Username()
accrue("user", v)
v, _ = u.User.Password()
accrue("password", v)
}
if host, port, err := net.SplitHostPort(u.Host); err != nil {
accrue("host", u.Host)
} else {
accrue("host", host)
accrue("port", port)
}
if u.Path != "" {
accrue("dbname", u.Path[1:])
}
q := u.Query()
for k := range q {
accrue(k, q.Get(k))
}
sort.Strings(kvs) // Makes testing easier (not a performance concern)
return strings.Join(kvs, " "), nil
}
func Connect(address string) (*sql.DB, error) {
if strings.HasPrefix(address, "postgres://") || strings.HasPrefix(address, "postgresql://") {
return sql.Open("pgx", address)
}
config, err := pgx.ParseDSN(address)
if err != nil {
return nil, err
}
pool, err := pgx.NewConnPool(pgx.ConnPoolConfig{ConnConfig: config})
if err != nil {
return nil, err
}
return stdlib.OpenFromConnPool(pool)
}