40f227ddbb
Add a WithChainUnaryServerInterceptor server option to allow using more that one server side interceptor which will then get chained and invoked in the order given. This should allow us to implement opentelemetry instrumentation as interceptors while allowing users to keep intercepting their server side calls for other reasons at the same time. Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>
87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ttrpc
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import (
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"context"
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"errors"
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)
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type serverConfig struct {
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handshaker Handshaker
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interceptor UnaryServerInterceptor
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}
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// ServerOpt for configuring a ttrpc server
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type ServerOpt func(*serverConfig) error
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// WithServerHandshaker can be passed to NewServer to ensure that the
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// handshaker is called before every connection attempt.
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//
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// Only one handshaker is allowed per server.
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func WithServerHandshaker(handshaker Handshaker) ServerOpt {
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return func(c *serverConfig) error {
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if c.handshaker != nil {
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return errors.New("only one handshaker allowed per server")
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}
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c.handshaker = handshaker
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return nil
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}
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}
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// WithUnaryServerInterceptor sets the provided interceptor on the server
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func WithUnaryServerInterceptor(i UnaryServerInterceptor) ServerOpt {
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return func(c *serverConfig) error {
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if c.interceptor != nil {
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return errors.New("only one unchained interceptor allowed per server")
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}
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c.interceptor = i
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return nil
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}
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}
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// WithChainUnaryServerInterceptor sets the provided chain of server interceptors
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func WithChainUnaryServerInterceptor(interceptors ...UnaryServerInterceptor) ServerOpt {
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return func(c *serverConfig) error {
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if len(interceptors) == 0 {
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return nil
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}
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if c.interceptor != nil {
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interceptors = append([]UnaryServerInterceptor{c.interceptor}, interceptors...)
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}
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c.interceptor = func(
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ctx context.Context,
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unmarshal Unmarshaler,
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info *UnaryServerInfo,
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method Method) (interface{}, error) {
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return interceptors[0](ctx, unmarshal, info,
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chainUnaryServerInterceptors(info, method, interceptors[1:]))
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}
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return nil
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}
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}
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func chainUnaryServerInterceptors(info *UnaryServerInfo, method Method, interceptors []UnaryServerInterceptor) Method {
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if len(interceptors) == 0 {
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return method
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}
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return func(ctx context.Context, unmarshal func(interface{}) error) (interface{}, error) {
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return interceptors[0](ctx, unmarshal, info,
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chainUnaryServerInterceptors(info, method, interceptors[1:]))
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}
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}
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