增加websocket支持

vendor/github.com/jackc/pgx/v5/pgproto3/pgproto3.go

@@ -4,14 +4,8 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
-
-	"github.com/jackc/pgx/v5/internal/pgio"
 )
 
-// maxMessageBodyLen is the maximum length of a message body in bytes. See PG_LARGE_MESSAGE_LIMIT in the PostgreSQL
-// source. It is defined as (MaxAllocSize - 1). MaxAllocSize is defined as 0x3fffffff.
-const maxMessageBodyLen = (0x3fffffff - 1)
-
 // Message is the interface implemented by an object that can decode and encode
 // a particular PostgreSQL message.
 type Message interface {
@@ -20,7 +14,7 @@ type Message interface {
 	Decode(data []byte) error
 
 	// Encode appends itself to dst and returns the new buffer.
-	Encode(dst []byte) ([]byte, error)
+	Encode(dst []byte) []byte
 }
 
 // FrontendMessage is a message sent by the frontend (i.e. the client).
@@ -76,15 +70,6 @@ func (e *writeError) Unwrap() error {
 	return e.err
 }
 
-type ExceededMaxBodyLenErr struct {
-	MaxExpectedBodyLen int
-	ActualBodyLen      int
-}
-
-func (e *ExceededMaxBodyLenErr) Error() string {
-	return fmt.Sprintf("invalid body length: expected at most %d, but got %d", e.MaxExpectedBodyLen, e.ActualBodyLen)
-}
-
 // getValueFromJSON gets the value from a protocol message representation in JSON.
 func getValueFromJSON(v map[string]string) ([]byte, error) {
 	if v == nil {
@@ -98,23 +83,3 @@ func getValueFromJSON(v map[string]string) ([]byte, error) {
 	}
 	return nil, errors.New("unknown protocol representation")
 }
-
-// beginMessage begins a new message of type t. It appends the message type and a placeholder for the message length to
-// dst. It returns the new buffer and the position of the message length placeholder.
-func beginMessage(dst []byte, t byte) ([]byte, int) {
-	dst = append(dst, t)
-	sp := len(dst)
-	dst = pgio.AppendInt32(dst, -1)
-	return dst, sp
-}
-
-// finishMessage finishes a message that was started with beginMessage. It computes the message length and writes it to
-// dst[sp]. If the message length is too large it returns an error. Otherwise it returns the final message buffer.
-func finishMessage(dst []byte, sp int) ([]byte, error) {
-	messageBodyLen := len(dst[sp:])
-	if messageBodyLen > maxMessageBodyLen {
-		return nil, errors.New("message body too large")
-	}
-	pgio.SetInt32(dst[sp:], int32(messageBodyLen))
-	return dst, nil
-}