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rpcretry.go
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rpcretry.go
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package rpcretry
import (
"context"
"math"
"time"
"go.mercari.io/datastore"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var _ datastore.Middleware = &retryHandler{}
// New automatically RPC retry middleware creates & returns.
func New(opts ...RetryOption) datastore.Middleware {
rh := &retryHandler{
retryLimit: 3,
minBackoffDuration: 100 * time.Millisecond,
logf: func(ctx context.Context, format string, args ...interface{}) {},
}
for _, opt := range opts {
opt.Apply(rh)
}
return rh
}
type retryHandler struct {
retryLimit int
minBackoffDuration time.Duration
maxBackoffDuration time.Duration
maxDoublings int
logf func(ctx context.Context, format string, args ...interface{})
}
// A RetryOption is an retry option for a retry middleware.
type RetryOption interface {
Apply(*retryHandler)
}
func (rh *retryHandler) waitDuration(retry int) time.Duration {
d := 10 * time.Millisecond
if 0 <= rh.minBackoffDuration {
d = rh.minBackoffDuration
}
m := retry
if 0 < rh.maxDoublings && rh.maxDoublings < m {
m = rh.maxDoublings
}
if m <= 0 {
m = 1
}
wait := math.Pow(2, float64(m-1)) * float64(d)
if 0 < rh.maxBackoffDuration {
wait = math.Min(wait, float64(rh.maxBackoffDuration))
}
return time.Duration(wait)
}
func (rh *retryHandler) try(ctx context.Context, logPrefix string, f func() error) {
try := 1
for {
err := f()
if err == nil {
return
} else if _, ok := err.(datastore.MultiError); ok {
// If MultiError returns, it should not be fixed even if it is retried
return
} else if err == context.DeadlineExceeded || err == context.Canceled {
// for appengine datastore
return
} else if code := status.Code(err); code == codes.DeadlineExceeded || code == codes.Canceled {
// for cloud datastore
return
}
if rh.retryLimit <= try {
break
}
d := rh.waitDuration(try)
rh.logf(ctx, "%s: err=%s, will be retry #%d after %s", logPrefix, err.Error(), try, d.String())
t := time.NewTimer(d)
select {
case <-ctx.Done():
t.Stop()
case <-t.C:
}
try++
}
}
func (rh *retryHandler) AllocateIDs(info *datastore.MiddlewareInfo, keys []datastore.Key) (retKeys []datastore.Key, retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.AllocateIDs", func() error {
retKeys, retErr = next.AllocateIDs(info, keys)
return retErr
})
return
}
func (rh *retryHandler) PutMultiWithoutTx(info *datastore.MiddlewareInfo, keys []datastore.Key, psList []datastore.PropertyList) (retKeys []datastore.Key, retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.PutMultiWithoutTx", func() error {
retKeys, retErr = next.PutMultiWithoutTx(info, keys, psList)
return retErr
})
return
}
func (rh *retryHandler) PutMultiWithTx(info *datastore.MiddlewareInfo, keys []datastore.Key, psList []datastore.PropertyList) (retPKeys []datastore.PendingKey, retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.PutMultiWithTx", func() error {
retPKeys, retErr = next.PutMultiWithTx(info, keys, psList)
return retErr
})
return
}
func (rh *retryHandler) GetMultiWithoutTx(info *datastore.MiddlewareInfo, keys []datastore.Key, psList []datastore.PropertyList) (retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.GetMultiWithoutTx", func() error {
retErr = next.GetMultiWithoutTx(info, keys, psList)
return retErr
})
return
}
func (rh *retryHandler) GetMultiWithTx(info *datastore.MiddlewareInfo, keys []datastore.Key, psList []datastore.PropertyList) (retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.GetMultiWithTx", func() error {
retErr = next.GetMultiWithTx(info, keys, psList)
return retErr
})
return
}
func (rh *retryHandler) DeleteMultiWithoutTx(info *datastore.MiddlewareInfo, keys []datastore.Key) (retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.DeleteMultiWithoutTx", func() error {
retErr = next.DeleteMultiWithoutTx(info, keys)
return retErr
})
return
}
func (rh *retryHandler) DeleteMultiWithTx(info *datastore.MiddlewareInfo, keys []datastore.Key) (retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.DeleteMultiWithTx", func() error {
retErr = next.DeleteMultiWithTx(info, keys)
return retErr
})
return
}
func (rh *retryHandler) PostCommit(info *datastore.MiddlewareInfo, tx datastore.Transaction, commit datastore.Commit) (retErr error) {
return info.Next.PostCommit(info, tx, commit)
}
func (rh *retryHandler) PostRollback(info *datastore.MiddlewareInfo, tx datastore.Transaction) (retErr error) {
return info.Next.PostRollback(info, tx)
}
func (rh *retryHandler) Run(info *datastore.MiddlewareInfo, q datastore.Query, qDump *datastore.QueryDump) datastore.Iterator {
return info.Next.Run(info, q, qDump)
}
func (rh *retryHandler) GetAll(info *datastore.MiddlewareInfo, q datastore.Query, qDump *datastore.QueryDump, psList *[]datastore.PropertyList) (retKeys []datastore.Key, retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.GetAll", func() error {
retKeys, retErr = next.GetAll(info, q, qDump, psList)
return retErr
})
return
}
func (rh *retryHandler) Next(info *datastore.MiddlewareInfo, q datastore.Query, qDump *datastore.QueryDump, iter datastore.Iterator, ps *datastore.PropertyList) (datastore.Key, error) {
// Next is not idempotent
return info.Next.Next(info, q, qDump, iter, ps)
}
func (rh *retryHandler) Count(info *datastore.MiddlewareInfo, q datastore.Query, qDump *datastore.QueryDump) (retCnt int, retErr error) {
next := info.Next
rh.try(info.Context, "middleware/rpcretry.Count", func() error {
retCnt, retErr = next.Count(info, q, qDump)
return retErr
})
return
}