diff options
Diffstat (limited to 'vendor/github.com/jackc/pgx/v5/pgproto3/backend.go')
| -rw-r--r-- | vendor/github.com/jackc/pgx/v5/pgproto3/backend.go | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/vendor/github.com/jackc/pgx/v5/pgproto3/backend.go b/vendor/github.com/jackc/pgx/v5/pgproto3/backend.go index efa909c3a..d146c3384 100644 --- a/vendor/github.com/jackc/pgx/v5/pgproto3/backend.go +++ b/vendor/github.com/jackc/pgx/v5/pgproto3/backend.go @@ -16,7 +16,8 @@ type Backend struct { // before it is actually transmitted (i.e. before Flush). tracer *tracer - wbuf []byte + wbuf []byte + encodeError error // Frontend message flyweights bind Bind @@ -55,11 +56,21 @@ func NewBackend(r io.Reader, w io.Writer) *Backend { return &Backend{cr: cr, w: w} } -// Send sends a message to the frontend (i.e. the client). The message is not guaranteed to be written until Flush is -// called. +// Send sends a message to the frontend (i.e. the client). The message is buffered until Flush is called. Any error +// encountered will be returned from Flush. func (b *Backend) Send(msg BackendMessage) { + if b.encodeError != nil { + return + } + prevLen := len(b.wbuf) - b.wbuf = msg.Encode(b.wbuf) + newBuf, err := msg.Encode(b.wbuf) + if err != nil { + b.encodeError = err + return + } + b.wbuf = newBuf + if b.tracer != nil { b.tracer.traceMessage('B', int32(len(b.wbuf)-prevLen), msg) } @@ -67,6 +78,12 @@ func (b *Backend) Send(msg BackendMessage) { // Flush writes any pending messages to the frontend (i.e. the client). func (b *Backend) Flush() error { + if err := b.encodeError; err != nil { + b.encodeError = nil + b.wbuf = b.wbuf[:0] + return &writeError{err: err, safeToRetry: true} + } + n, err := b.w.Write(b.wbuf) const maxLen = 1024 |