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Apply wrappers to gRPC streams (#1675)

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* Add wrappers to grpc streams

* Fix typo
This commit is contained in:
ben-toogood 2020-06-02 17:56:26 +01:00 committed by GitHub
parent e4e56b0f3f
commit 8f6ec21b91
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1 changed files with 33 additions and 17 deletions
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42
client/grpc/grpc.go
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@ -6,6 +6,7 @@ import (
"crypto/tls"
"fmt"
"net"
"reflect"
"strings"
"sync/atomic"
"time"
@ -173,7 +174,7 @@ func (g *grpcClient) call(ctx context.Context, node *registry.Node, req client.R
return grr
}
func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client.Request, opts client.CallOptions) (client.Stream, error) {
func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client.Request, rsp interface{}, opts client.CallOptions) error {
var header map[string]string
address := node.Address
@ -199,7 +200,7 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
cf, err := g.newGRPCCodec(req.ContentType())
if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
return errors.InternalServerError("go.micro.client", err.Error())
}
var dialCtx context.Context
@ -224,7 +225,7 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
cc, err := grpc.DialContext(dialCtx, address, grpcDialOptions...)
if err != nil {
return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
}
desc := &grpc.StreamDesc{
@ -252,7 +253,7 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
// close the connection
cc.Close()
// now return the error
return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
}
codec := &grpcCodec{
@ -265,21 +266,25 @@ func (g *grpcClient) stream(ctx context.Context, node *registry.Node, req client
r.codec = codec
}
rsp := &response{
// setup the stream response
stream := &grpcStream{
context: ctx,
request: req,
response: &response{
conn: cc,
stream: st,
codec: cf,
gcodec: codec,
}
return &grpcStream{
context: ctx,
request: req,
response: rsp,
},
stream: st,
conn: cc,
cancel: cancel,
}, nil
}
// set the stream as the response
val := reflect.ValueOf(rsp).Elem()
val.Set(reflect.ValueOf(stream).Elem())
return nil
}
func (g *grpcClient) poolMaxStreams() int {
@ -506,6 +511,14 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
default:
}
// make a copy of stream
gstream := g.stream
// wrap the call in reverse
for i := len(callOpts.CallWrappers); i > 0; i-- {
gstream = callOpts.CallWrappers[i-1](gstream)
}
call := func(i int) (client.Stream, error) {
// call backoff first. Someone may want an initial start delay
t, err := callOpts.Backoff(ctx, req, i)
@ -527,7 +540,10 @@ func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...cli
return nil, errors.InternalServerError("go.micro.client", "error selecting %s node: %s", service, err.Error())
}
stream, err := g.stream(ctx, node, req, callOpts)
// make the call
stream := &grpcStream{}
err = g.stream(ctx, node, req, stream, callOpts)
g.opts.Selector.Mark(service, node, err)
return stream, err
}