forked from TrueCloudLab/restic
106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
/*
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Copyright 2016 Google Inc. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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// This is ia snapshot from github.com/googleapis/gax-go with minor modifications.
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package gax
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import (
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"time"
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"google.golang.org/grpc/codes"
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)
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type CallOption interface {
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Resolve(*CallSettings)
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}
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type callOptions []CallOption
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func (opts callOptions) Resolve(s *CallSettings) *CallSettings {
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for _, opt := range opts {
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opt.Resolve(s)
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}
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return s
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}
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// Encapsulates the call settings for a particular API call.
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type CallSettings struct {
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Timeout time.Duration
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RetrySettings RetrySettings
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}
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// Per-call configurable settings for retrying upon transient failure.
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type RetrySettings struct {
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RetryCodes map[codes.Code]bool
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BackoffSettings BackoffSettings
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}
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// Parameters to the exponential backoff algorithm for retrying.
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type BackoffSettings struct {
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DelayTimeoutSettings MultipliableDuration
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RPCTimeoutSettings MultipliableDuration
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}
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type MultipliableDuration struct {
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Initial time.Duration
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Max time.Duration
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Multiplier float64
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}
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func (w CallSettings) Resolve(s *CallSettings) {
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s.Timeout = w.Timeout
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s.RetrySettings = w.RetrySettings
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s.RetrySettings.RetryCodes = make(map[codes.Code]bool, len(w.RetrySettings.RetryCodes))
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for key, value := range w.RetrySettings.RetryCodes {
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s.RetrySettings.RetryCodes[key] = value
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}
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}
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type withRetryCodes []codes.Code
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func (w withRetryCodes) Resolve(s *CallSettings) {
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s.RetrySettings.RetryCodes = make(map[codes.Code]bool)
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for _, code := range w {
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s.RetrySettings.RetryCodes[code] = true
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}
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}
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// WithRetryCodes sets a list of Google API canonical error codes upon which a
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// retry should be attempted.
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func WithRetryCodes(retryCodes []codes.Code) CallOption {
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return withRetryCodes(retryCodes)
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}
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type withDelayTimeoutSettings MultipliableDuration
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func (w withDelayTimeoutSettings) Resolve(s *CallSettings) {
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s.RetrySettings.BackoffSettings.DelayTimeoutSettings = MultipliableDuration(w)
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}
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// WithDelayTimeoutSettings specifies:
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// - The initial delay time, in milliseconds, between the completion of
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// the first failed request and the initiation of the first retrying
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// request.
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// - The multiplier by which to increase the delay time between the
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// completion of failed requests, and the initiation of the subsequent
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// retrying request.
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// - The maximum delay time, in milliseconds, between requests. When this
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// value is reached, `RetryDelayMultiplier` will no longer be used to
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// increase delay time.
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func WithDelayTimeoutSettings(initial time.Duration, max time.Duration, multiplier float64) CallOption {
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return withDelayTimeoutSettings(MultipliableDuration{initial, max, multiplier})
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}
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