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proxy_conn.go
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/
proxy_conn.go
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package psqlfront
import (
"context"
"crypto/tls"
"errors"
"fmt"
"io"
"log"
"net"
"strings"
"github.com/jackc/pgproto3/v2"
"golang.org/x/sync/errgroup"
)
type Notifier interface {
Notify(ctx context.Context, resp *pgproto3.NoticeResponse) error
}
type notifier struct {
backend *pgproto3.Backend
}
func (n *notifier) Notify(ctx context.Context, resp *pgproto3.NoticeResponse) error {
return n.backend.Send(resp)
}
type ProxyConnOptions struct {
tlsConfig *tls.Config
onQueryReceivedHandler func(ctx context.Context, query string, isPreparedStmt bool, notifier Notifier) error
}
type ProxyConn struct {
backend *pgproto3.Backend
frontend *pgproto3.Frontend
opts *ProxyConnOptions
client net.Conn
upstream net.Conn
}
func WithProxyConnTLS(tlsConfig *tls.Config) func(opts *ProxyConnOptions) {
return func(opts *ProxyConnOptions) {
opts.tlsConfig = tlsConfig
}
}
func WithProxyConnOnQueryReceived(handler func(ctx context.Context, query string, isPreparedStmt bool, notifier Notifier) error) func(opts *ProxyConnOptions) {
return func(opts *ProxyConnOptions) {
opts.onQueryReceivedHandler = handler
}
}
func NewProxyConn(client net.Conn, upstream net.Conn, optFns ...func(opts *ProxyConnOptions)) (*ProxyConn, error) {
conn := &ProxyConn{
backend: pgproto3.NewBackend(pgproto3.NewChunkReader(client), client),
frontend: pgproto3.NewFrontend(pgproto3.NewChunkReader(upstream), upstream),
opts: &ProxyConnOptions{},
client: client,
upstream: upstream,
}
for _, optFn := range optFns {
optFn(conn.opts)
}
return conn, nil
}
func (conn *ProxyConn) Run(ctx context.Context) error {
defer conn.client.Close()
defer conn.upstream.Close()
remoteAddr := conn.client.RemoteAddr()
log.Printf("[debug][%s] start proxy connection", remoteAddr)
defer log.Printf("[debug][%s] end proxy connection", remoteAddr)
startupMessage, err := conn.backend.ReceiveStartupMessage()
if err != nil {
return fmt.Errorf("ReceiveStartupMessage:%w", err)
}
log.Printf("[debug][%s] ReceiveStartupMessage", remoteAddr)
switch startupMessage.(type) {
case *pgproto3.SSLRequest:
log.Printf("[debug][%s] SSLRequest", remoteAddr)
if conn.opts.tlsConfig != nil {
_, err := conn.client.Write([]byte("S"))
if err != nil {
return fmt.Errorf("send tls support:%w", err)
}
log.Printf("[debug][%s] suport ssl", remoteAddr)
tlsConn := tls.Server(conn.client, conn.opts.tlsConfig)
conn.backend = pgproto3.NewBackend(pgproto3.NewChunkReader(tlsConn), tlsConn)
conn.client = tlsConn
startupMessage, err = conn.backend.ReceiveStartupMessage()
if err != nil {
return fmt.Errorf("tls ReceiveStartupMessage:%w", err)
}
} else {
log.Printf("[debug][%s] can not use ssl", remoteAddr)
_, err := conn.client.Write([]byte("N"))
if err != nil {
return fmt.Errorf("send tls not support:%w", err)
}
}
case *pgproto3.GSSEncRequest:
log.Printf("[debug][%s] can not use gss enc", remoteAddr)
_, err := conn.client.Write([]byte("N"))
if err != nil {
return fmt.Errorf("send gss enc not support:%w", err)
}
}
if startupMessage, ok := startupMessage.(*pgproto3.StartupMessage); ok {
var builder strings.Builder
fmt.Fprintf(&builder, "protocol_version:%d", startupMessage.ProtocolVersion)
for key, value := range startupMessage.Parameters {
fmt.Fprintf(&builder, " %s:%s", key, value)
}
log.Printf("[info][%s] %s", remoteAddr, builder.String())
}
log.Printf("[debug][%s] send startup message to upstream", remoteAddr)
if err := conn.frontend.Send(startupMessage); err != nil {
return fmt.Errorf("frontend send startup message:%w", err)
}
cctx, cancel := context.WithCancel(ctx)
eg, cctx := errgroup.WithContext(cctx)
eg.Go(func() error {
defer cancel()
for {
select {
case <-cctx.Done():
return nil
default:
}
fm, err := conn.backend.Receive()
if err != nil {
select {
case <-cctx.Done():
return nil
default:
return fmt.Errorf("receive message from client:%w", err)
}
}
switch fm := fm.(type) {
case *pgproto3.Query:
log.Printf("[info][%s] receive message from client: incoming SQL: %s", remoteAddr, fm.String)
if conn.opts.onQueryReceivedHandler != nil {
if err := conn.opts.onQueryReceivedHandler(cctx, fm.String, false, ¬ifier{backend: conn.backend}); err != nil {
log.Printf("[error] on query received: %v", err)
if err := conn.backend.Send(&pgproto3.NoticeResponse{
Severity: "WARNING",
Message: "Failed on query received handler",
Detail: err.Error(),
}); err != nil {
return fmt.Errorf("on query recived:%w", err)
}
}
}
case *pgproto3.Parse:
log.Printf("[info][%s] receive message from client: parse SQL: %s name=%s", remoteAddr, fm.Query, fm.Name)
if conn.opts.onQueryReceivedHandler != nil {
if err := conn.opts.onQueryReceivedHandler(cctx, fm.Query, true, ¬ifier{backend: conn.backend}); err != nil {
log.Printf("[error] on query received: %v", err)
if err := conn.backend.Send(&pgproto3.NoticeResponse{
Severity: "WARNING",
Message: "Failed on query received handler",
Detail: err.Error(),
}); err != nil {
return fmt.Errorf("on query recived:%w", err)
}
}
}
case *pgproto3.Describe:
log.Printf("[debug][%s] receive message from client: describe: %s type='%c'", remoteAddr, fm.Name, fm.ObjectType)
case *pgproto3.Bind:
log.Printf("[debug][%s] receive message from client: bind: %s", remoteAddr, fm.PreparedStatement)
case *pgproto3.Execute:
log.Printf("[debug][%s] receive message from client: execute: %s max_rows=%d", remoteAddr, fm.Portal, fm.MaxRows)
case *pgproto3.Terminate:
log.Printf("[debug][%s] receive message from client: connection terminate", remoteAddr)
return conn.frontend.Send(fm)
default:
log.Printf("[debug][%s] receive message from client: %T", remoteAddr, fm)
}
err = conn.frontend.Send(fm)
if err != nil {
return fmt.Errorf("send message to upstream:%w", err)
}
}
})
eg.Go(func() error {
defer cancel()
for {
select {
case <-cctx.Done():
return nil
default:
}
bm, err := conn.frontend.Receive()
if err != nil {
select {
case <-cctx.Done():
return nil
default:
return fmt.Errorf("receive message from upstream:%w", err)
}
}
conn.backend.SetAuthType(conn.frontend.GetAuthType())
switch bm := bm.(type) {
default:
log.Printf("[debug][%s] receive message from upstream: %T", remoteAddr, bm)
}
err = conn.backend.Send(bm)
if err != nil {
return fmt.Errorf("send message to client:%w", err)
}
}
})
go func() error {
<-ctx.Done()
cancel()
conn.client.Close()
conn.upstream.Close()
return nil
}()
err = eg.Wait()
cancel()
if err != nil {
if errors.Is(err, io.ErrUnexpectedEOF) {
return nil
}
return err
}
return nil
}