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retry.go
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retry.go
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package aviation
import (
"context"
"time"
"github.com/jpillora/backoff"
"github.com/cdr/grip"
"github.com/cdr/grip/message"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
func MakeRetryUnaryClientInterceptor(maxRetries int) grpc.UnaryClientInterceptor {
return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
var lastErr error
b := getBackoff(100 * time.Millisecond)
var i int
start := time.Now()
retry:
for i = 0; i < maxRetries; i++ {
lastErr = invoker(ctx, method, req, reply, cc, opts...)
grip.Info(message.Fields{
"message": "GRPC client retry",
"method": method,
"attempt": i,
"error": lastErr,
})
if lastErr == nil {
return nil
}
if !isRetriable(lastErr) {
break retry
}
timer := time.NewTimer(b.Duration())
select {
case <-ctx.Done():
timer.Stop()
break retry
case <-timer.C:
timer.Stop()
continue retry
}
}
timeElapsed := time.Now().Sub(start)
grip.Warning(message.WrapError(lastErr, message.Fields{
"message": "GRPC client retries exceeded or canceled",
"method": method,
"total_retries": i,
"time_elasped": timeElapsed,
}))
return lastErr
}
}
func MakeRetryStreamClientInterceptor(maxRetries int) grpc.StreamClientInterceptor {
return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
var clientStream grpc.ClientStream
var lastErr error
b := getBackoff(100 * time.Millisecond)
var i int
start := time.Now()
retry:
for i = 0; i < maxRetries; i++ {
clientStream, lastErr = streamer(ctx, desc, cc, method, opts...)
grip.Info(message.Fields{
"message": "GRPC client retry",
"method": method,
"attempt": i,
"error": lastErr,
})
if lastErr == nil {
return clientStream, nil
}
if !isRetriable(lastErr) {
break retry
}
timer := time.NewTimer(b.Duration())
select {
case <-ctx.Done():
timer.Stop()
break retry
case <-timer.C:
timer.Stop()
continue retry
}
}
timeElapsed := time.Now().Sub(start)
grip.Warning(message.WrapError(lastErr, message.Fields{
"message": "GRPC client retries exceeded or canceled",
"method": method,
"total_retries": i,
"time_elasped": timeElapsed,
}))
return nil, lastErr
}
}
func getBackoff(min time.Duration) *backoff.Backoff {
return &backoff.Backoff{
Min: min,
Max: min * 10,
Factor: 2,
Jitter: false,
}
}
func isRetriable(err error) bool {
switch errCode := grpc.Code(err); errCode {
case codes.Unknown:
return true
case codes.ResourceExhausted:
return true
case codes.Aborted:
return true
case codes.Internal:
return true
case codes.Unavailable:
return true
default:
return false
}
}