74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
// Package wspb provides helpers for reading and writing protobuf messages.
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package wspb // import "nhooyr.io/websocket/wspb"
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import (
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"bytes"
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"context"
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"fmt"
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"github.com/golang/protobuf/proto"
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"nhooyr.io/websocket"
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"nhooyr.io/websocket/internal/bpool"
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"nhooyr.io/websocket/internal/errd"
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)
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// Read reads a protobuf message from c into v.
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// It will reuse buffers in between calls to avoid allocations.
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func Read(ctx context.Context, c *websocket.Conn, v proto.Message) error {
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return read(ctx, c, v)
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}
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func read(ctx context.Context, c *websocket.Conn, v proto.Message) (err error) {
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defer errd.Wrap(&err, "failed to read protobuf message")
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typ, r, err := c.Reader(ctx)
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if err != nil {
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return err
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}
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if typ != websocket.MessageBinary {
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c.Close(websocket.StatusUnsupportedData, "expected binary message")
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return fmt.Errorf("expected binary message for protobuf but got: %v", typ)
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}
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b := bpool.Get()
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defer bpool.Put(b)
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_, err = b.ReadFrom(r)
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if err != nil {
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return err
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}
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err = proto.Unmarshal(b.Bytes(), v)
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if err != nil {
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c.Close(websocket.StatusInvalidFramePayloadData, "failed to unmarshal protobuf")
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return fmt.Errorf("failed to unmarshal protobuf: %w", err)
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}
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return nil
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}
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// Write writes the protobuf message v to c.
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// It will reuse buffers in between calls to avoid allocations.
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func Write(ctx context.Context, c *websocket.Conn, v proto.Message) error {
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return write(ctx, c, v)
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}
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func write(ctx context.Context, c *websocket.Conn, v proto.Message) (err error) {
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defer errd.Wrap(&err, "failed to write protobuf message")
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b := bpool.Get()
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pb := proto.NewBuffer(b.Bytes())
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defer func() {
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bpool.Put(bytes.NewBuffer(pb.Bytes()))
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}()
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err = pb.Marshal(v)
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if err != nil {
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return fmt.Errorf("failed to marshal protobuf: %w", err)
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}
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return c.Write(ctx, websocket.MessageBinary, pb.Bytes())
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}
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