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// Copyright 2022 The OpenZipkin Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package grpc
import (
"context"
"strings"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/status"
"github.com/openzipkin/zipkin-go"
"github.com/openzipkin/zipkin-go/model"
)
// A RPCHandler can be registered using WithClientRPCHandler or WithServerRPCHandler to intercept calls to HandleRPC of
// a handler for additional span customization.
type RPCHandler func(span zipkin.Span, rpcStats stats.RPCStats)
func spanName(rti *stats.RPCTagInfo) string {
name := strings.TrimPrefix(rti.FullMethodName, "/")
name = strings.Replace(name, "/", ".", -1)
return name
}
func handleRPC(ctx context.Context, rs stats.RPCStats) {
span := zipkin.SpanFromContext(ctx)
if zipkin.IsNoop(span) {
return
}
switch rs := rs.(type) {
case *stats.End:
s, ok := status.FromError(rs.Error)
// rs.Error should always be convertable to a status, this is just a defensive check.
if ok {
if s.Code() != codes.OK {
// Uppercase for consistency with Brave
c := strings.ToUpper(s.Code().String())
span.Tag("grpc.status_code", c)
zipkin.TagError.Set(span, c)
}
} else {
zipkin.TagError.Set(span, rs.Error.Error())
}
span.Finish()
}
}
func remoteEndpointFromContext(ctx context.Context, name string) *model.Endpoint {
remoteAddr := ""
p, ok := peer.FromContext(ctx)
if ok {
remoteAddr = p.Addr.String()
}
ep, _ := zipkin.NewEndpoint(name, remoteAddr)
return ep
}
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