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stream.go
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stream.go
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package http
import (
"bufio"
"context"
"fmt"
"io"
"net"
"net/http"
"sync"
"go.unistack.org/micro/v3/client"
"go.unistack.org/micro/v3/codec"
"go.unistack.org/micro/v3/errors"
)
// Implements the streamer interface
type httpStream struct {
err error
conn net.Conn
cf codec.Codec
context context.Context
request client.Request
closed chan bool
reader *bufio.Reader
address string
ct string
opts client.CallOptions
sync.RWMutex
}
var errShutdown = fmt.Errorf("connection is shut down")
func (h *httpStream) isClosed() bool {
select {
case <-h.closed:
return true
default:
return false
}
}
func (h *httpStream) Context() context.Context {
return h.context
}
func (h *httpStream) Request() client.Request {
return h.request
}
func (h *httpStream) Response() client.Response {
return nil
}
func (h *httpStream) SendMsg(msg interface{}) error {
return h.Send(msg)
}
func (h *httpStream) Send(msg interface{}) error {
h.Lock()
defer h.Unlock()
if h.isClosed() {
h.err = errShutdown
return errShutdown
}
hreq, err := newRequest(h.context, h.address, h.request, h.ct, h.cf, msg, h.opts)
if err != nil {
return err
}
return hreq.Write(h.conn)
}
func (h *httpStream) RecvMsg(msg interface{}) error {
return h.Recv(msg)
}
func (h *httpStream) Recv(msg interface{}) error {
h.Lock()
defer h.Unlock()
if h.isClosed() {
h.err = errShutdown
return errShutdown
}
hrsp, err := http.ReadResponse(h.reader, new(http.Request))
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
defer hrsp.Body.Close()
return h.parseRsp(h.context, hrsp, h.cf, msg, h.opts)
}
func (h *httpStream) Error() error {
h.RLock()
defer h.RUnlock()
return h.err
}
func (h *httpStream) CloseSend() error {
return h.Close()
}
func (h *httpStream) Close() error {
select {
case <-h.closed:
return nil
default:
close(h.closed)
return h.conn.Close()
}
}
func (h *httpStream) parseRsp(ctx context.Context, hrsp *http.Response, cf codec.Codec, rsp interface{}, opts client.CallOptions) error {
var err error
select {
case <-ctx.Done():
err = ctx.Err()
default:
// fast path return
if hrsp.StatusCode == http.StatusNoContent {
return nil
}
if hrsp.StatusCode < 400 {
if err = cf.ReadBody(hrsp.Body, rsp); err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
return nil
}
errmap, ok := opts.Context.Value(errorMapKey{}).(map[string]interface{})
if ok && errmap != nil {
if err, ok = errmap[fmt.Sprintf("%d", hrsp.StatusCode)].(error); !ok {
err, ok = errmap["default"].(error)
}
}
if !ok || err == nil {
buf, cerr := io.ReadAll(hrsp.Body)
if cerr != nil {
return errors.InternalServerError("go.micro.client", cerr.Error())
}
return errors.New("go.micro.client", string(buf), int32(hrsp.StatusCode))
}
if cerr := cf.ReadBody(hrsp.Body, err); cerr != nil {
err = errors.InternalServerError("go.micro.client", cerr.Error())
}
}
return err
}