diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/retry/options.go b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/retry/options.go
new file mode 100644
index 0000000..7a633e2
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/retry/options.go
@@ -0,0 +1,142 @@
+// Copyright 2016 Michal Witkowski. All Rights Reserved.
+// See LICENSE for licensing terms.
+
+package grpc_retry
+
+import (
+	"context"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+)
+
+var (
+	// DefaultRetriableCodes is a set of well known types gRPC codes that should be retri-able.
+	//
+	// `ResourceExhausted` means that the user quota, e.g. per-RPC limits, have been reached.
+	// `Unavailable` means that system is currently unavailable and the client should retry again.
+	DefaultRetriableCodes = []codes.Code{codes.ResourceExhausted, codes.Unavailable}
+
+	defaultOptions = &options{
+		max:            0, // disabled
+		perCallTimeout: 0, // disabled
+		includeHeader:  true,
+		codes:          DefaultRetriableCodes,
+		backoffFunc: BackoffFuncContext(func(ctx context.Context, attempt uint) time.Duration {
+			return BackoffLinearWithJitter(50*time.Millisecond /*jitter*/, 0.10)(attempt)
+		}),
+	}
+)
+
+// BackoffFunc denotes a family of functions that control the backoff duration between call retries.
+//
+// They are called with an identifier of the attempt, and should return a time the system client should
+// hold off for. If the time returned is longer than the `context.Context.Deadline` of the request
+// the deadline of the request takes precedence and the wait will be interrupted before proceeding
+// with the next iteration.
+type BackoffFunc func(attempt uint) time.Duration
+
+// BackoffFuncContext denotes a family of functions that control the backoff duration between call retries.
+//
+// They are called with an identifier of the attempt, and should return a time the system client should
+// hold off for. If the time returned is longer than the `context.Context.Deadline` of the request
+// the deadline of the request takes precedence and the wait will be interrupted before proceeding
+// with the next iteration. The context can be used to extract request scoped metadata and context values.
+type BackoffFuncContext func(ctx context.Context, attempt uint) time.Duration
+
+// Disable disables the retry behaviour on this call, or this interceptor.
+//
+// Its semantically the same to `WithMax`
+func Disable() CallOption {
+	return WithMax(0)
+}
+
+// WithMax sets the maximum number of retries on this call, or this interceptor.
+func WithMax(maxRetries uint) CallOption {
+	return CallOption{applyFunc: func(o *options) {
+		o.max = maxRetries
+	}}
+}
+
+// WithBackoff sets the `BackoffFunc` used to control time between retries.
+func WithBackoff(bf BackoffFunc) CallOption {
+	return CallOption{applyFunc: func(o *options) {
+		o.backoffFunc = BackoffFuncContext(func(ctx context.Context, attempt uint) time.Duration {
+			return bf(attempt)
+		})
+	}}
+}
+
+// WithBackoffContext sets the `BackoffFuncContext` used to control time between retries.
+func WithBackoffContext(bf BackoffFuncContext) CallOption {
+	return CallOption{applyFunc: func(o *options) {
+		o.backoffFunc = bf
+	}}
+}
+
+// WithCodes sets which codes should be retried.
+//
+// Please *use with care*, as you may be retrying non-idempotent calls.
+//
+// You cannot automatically retry on Cancelled and Deadline, please use `WithPerRetryTimeout` for these.
+func WithCodes(retryCodes ...codes.Code) CallOption {
+	return CallOption{applyFunc: func(o *options) {
+		o.codes = retryCodes
+	}}
+}
+
+// WithPerRetryTimeout sets the RPC timeout per call (including initial call) on this call, or this interceptor.
+//
+// The context.Deadline of the call takes precedence and sets the maximum time the whole invocation
+// will take, but WithPerRetryTimeout can be used to limit the RPC time per each call.
+//
+// For example, with context.Deadline = now + 10s, and WithPerRetryTimeout(3 * time.Seconds), each
+// of the retry calls (including the initial one) will have a deadline of now + 3s.
+//
+// A value of 0 disables the timeout overrides completely and returns to each retry call using the
+// parent `context.Deadline`.
+//
+// Note that when this is enabled, any DeadlineExceeded errors that are propagated up will be retried.
+func WithPerRetryTimeout(timeout time.Duration) CallOption {
+	return CallOption{applyFunc: func(o *options) {
+		o.perCallTimeout = timeout
+	}}
+}
+
+type options struct {
+	max            uint
+	perCallTimeout time.Duration
+	includeHeader  bool
+	codes          []codes.Code
+	backoffFunc    BackoffFuncContext
+}
+
+// CallOption is a grpc.CallOption that is local to grpc_retry.
+type CallOption struct {
+	grpc.EmptyCallOption // make sure we implement private after() and before() fields so we don't panic.
+	applyFunc            func(opt *options)
+}
+
+func reuseOrNewWithCallOptions(opt *options, callOptions []CallOption) *options {
+	if len(callOptions) == 0 {
+		return opt
+	}
+	optCopy := &options{}
+	*optCopy = *opt
+	for _, f := range callOptions {
+		f.applyFunc(optCopy)
+	}
+	return optCopy
+}
+
+func filterCallOptions(callOptions []grpc.CallOption) (grpcOptions []grpc.CallOption, retryOptions []CallOption) {
+	for _, opt := range callOptions {
+		if co, ok := opt.(CallOption); ok {
+			retryOptions = append(retryOptions, co)
+		} else {
+			grpcOptions = append(grpcOptions, opt)
+		}
+	}
+	return grpcOptions, retryOptions
+}