mirror of
https://github.com/gravitational/teleport.git
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rosstimothy
25ec2c8a39
* Add client side circuit breaker to auth clients In order to apply back pressure we can utilize a circuit breaker that monitors error responses from auth server. When tripped it will prevent all outbound requests to auth for a period of time. This can also help prevent a potential thundering heard when auth is in an unhealthy state. By default the circuit breaker will only be tripped if 90% of the requests made in the monitoring interval fail.
54 lines
1.8 KiB
Go
54 lines
1.8 KiB
Go
// Copyright 2022 Gravitational, Inc
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package breaker
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import (
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"context"
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"google.golang.org/grpc"
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)
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// UnaryClientInterceptor is a unary gRPC client interceptor that uses the provided CircuitBreaker to track errors
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// returned from the outgoing calls.
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func UnaryClientInterceptor(cb *CircuitBreaker) grpc.UnaryClientInterceptor {
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return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
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_, err := cb.Execute(func() (interface{}, error) {
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err := invoker(ctx, method, req, reply, cc, opts...)
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return nil, err
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})
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return err
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}
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}
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// StreamClientInterceptor is a stream gRPC client interceptor that uses the provided CircuitBreaker to track errors
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// returned from the outgoing calls.
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func StreamClientInterceptor(cb *CircuitBreaker) grpc.StreamClientInterceptor {
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return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
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stream, err := cb.Execute(func() (interface{}, error) {
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return streamer(ctx, desc, cc, method, opts...)
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})
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if stream == nil {
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return nil, err
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}
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if cs, ok := stream.(grpc.ClientStream); ok {
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return cs, err
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}
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return nil, err
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}
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}
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