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49 lines
1.0 KiB
Go
49 lines
1.0 KiB
Go
package serverinterceptors
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import (
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"context"
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"sync"
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"time"
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"google.golang.org/grpc"
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)
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// UnaryTimeoutInterceptor returns a func that sets timeout to incoming unary requests.
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func UnaryTimeoutInterceptor(timeout time.Duration) grpc.UnaryServerInterceptor {
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return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
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handler grpc.UnaryHandler) (interface{}, error) {
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ctx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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var resp interface{}
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var err error
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var lock sync.Mutex
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done := make(chan struct{})
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// create channel with buffer size 1 to avoid goroutine leak
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panicChan := make(chan interface{}, 1)
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go func() {
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defer func() {
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if p := recover(); p != nil {
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panicChan <- p
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}
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}()
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lock.Lock()
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defer lock.Unlock()
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resp, err = handler(ctx, req)
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close(done)
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}()
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select {
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case p := <-panicChan:
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panic(p)
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case <-done:
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lock.Lock()
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defer lock.Unlock()
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return resp, err
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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}
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}
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