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https://github.com/go-micro/go-micro.git
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d4b149046f
When developing go-micro services, it is frequently possible to set invalid results in the response pointer. When this happens (as I and @trushton personally experienced), `sendResponse()` returns an error correctly explaining what happened (e.g. protobuf refused to encode a bad struct) but the `call()` function one above it in the stack ignores the returned error object.
Thus, invalid structs go un-encoded and the _client side times out_. @trushton and I first caught this in our CI builds when we left a protobuf.Empty field uninitialized (nil) instead of setting it to `&ptypes.Empty{}`. This resulted in an `proto: oneof field has nil value` error, but it was dropped and became a terribly confusing client timeout instead.
This patch is two independent changes:
* In rpc_codec, when a serialization failure occurs serialize an error message, which will correctly become a 500 for HTTP services, about the encoding failure. This means rpc_codec only returns an `error` when a socket failure occurs, which I believe is the behavior that rpc_service is expecting anyway.
* In rpc_service, log any errors returned by sendResponse instead of dropping the error object. This will make debugging client timeouts less of a hassle.
119 lines
2.5 KiB
Go
119 lines
2.5 KiB
Go
package server
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import (
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"bytes"
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"github.com/micro/go-micro/codec"
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"github.com/micro/go-micro/codec/jsonrpc"
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"github.com/micro/go-micro/codec/protorpc"
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"github.com/micro/go-micro/transport"
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"github.com/pkg/errors"
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)
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type rpcPlusCodec struct {
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socket transport.Socket
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codec codec.Codec
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req *transport.Message
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buf *readWriteCloser
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}
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type readWriteCloser struct {
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wbuf *bytes.Buffer
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rbuf *bytes.Buffer
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}
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var (
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defaultCodecs = map[string]codec.NewCodec{
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"application/json": jsonrpc.NewCodec,
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"application/json-rpc": jsonrpc.NewCodec,
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"application/protobuf": protorpc.NewCodec,
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"application/proto-rpc": protorpc.NewCodec,
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"application/octet-stream": protorpc.NewCodec,
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}
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)
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func (rwc *readWriteCloser) Read(p []byte) (n int, err error) {
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return rwc.rbuf.Read(p)
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}
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func (rwc *readWriteCloser) Write(p []byte) (n int, err error) {
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return rwc.wbuf.Write(p)
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}
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func (rwc *readWriteCloser) Close() error {
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rwc.rbuf.Reset()
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rwc.wbuf.Reset()
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return nil
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}
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func newRpcPlusCodec(req *transport.Message, socket transport.Socket, c codec.NewCodec) serverCodec {
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rwc := &readWriteCloser{
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rbuf: bytes.NewBuffer(req.Body),
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wbuf: bytes.NewBuffer(nil),
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}
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r := &rpcPlusCodec{
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buf: rwc,
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codec: c(rwc),
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req: req,
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socket: socket,
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}
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return r
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}
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func (c *rpcPlusCodec) ReadRequestHeader(r *request, first bool) error {
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m := codec.Message{Header: c.req.Header}
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if !first {
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var tm transport.Message
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if err := c.socket.Recv(&tm); err != nil {
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return err
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}
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c.buf.rbuf.Reset()
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if _, err := c.buf.rbuf.Write(tm.Body); err != nil {
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return err
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}
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m.Header = tm.Header
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}
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err := c.codec.ReadHeader(&m, codec.Request)
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r.ServiceMethod = m.Method
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r.Seq = m.Id
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return err
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}
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func (c *rpcPlusCodec) ReadRequestBody(b interface{}) error {
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return c.codec.ReadBody(b)
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}
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func (c *rpcPlusCodec) WriteResponse(r *response, body interface{}, last bool) error {
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c.buf.wbuf.Reset()
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m := &codec.Message{
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Method: r.ServiceMethod,
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Id: r.Seq,
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Error: r.Error,
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Type: codec.Response,
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Header: map[string]string{},
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}
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if err := c.codec.Write(m, body); err != nil {
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c.buf.wbuf.Reset()
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m.Error = errors.Wrapf(err, "Unable to encode body").Error()
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if err := c.codec.Write(m, nil); err != nil {
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return err
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}
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}
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m.Header["Content-Type"] = c.req.Header["Content-Type"]
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return c.socket.Send(&transport.Message{
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Header: m.Header,
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Body: c.buf.wbuf.Bytes(),
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})
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}
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func (c *rpcPlusCodec) Close() error {
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c.buf.Close()
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c.codec.Close()
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return c.socket.Close()
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}
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