ceph-csi/vendor/google.golang.org/grpc/service_config.go
dependabot[bot] b11951a710 rebase: bump google.golang.org/grpc from 1.45.0 to 1.46.0
Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.45.0 to 1.46.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.45.0...v1.46.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
2022-04-26 10:09:00 +00:00

408 lines
12 KiB
Go
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
*
* Copyright 2017 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package grpc
import (
"encoding/json"
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"time"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/internal"
internalserviceconfig "google.golang.org/grpc/internal/serviceconfig"
"google.golang.org/grpc/serviceconfig"
)
const maxInt = int(^uint(0) >> 1)
// MethodConfig defines the configuration recommended by the service providers for a
// particular method.
//
// Deprecated: Users should not use this struct. Service config should be received
// through name resolver, as specified here
// https://github.com/grpc/grpc/blob/master/doc/service_config.md
type MethodConfig = internalserviceconfig.MethodConfig
type lbConfig struct {
name string
cfg serviceconfig.LoadBalancingConfig
}
// ServiceConfig is provided by the service provider and contains parameters for how
// clients that connect to the service should behave.
//
// Deprecated: Users should not use this struct. Service config should be received
// through name resolver, as specified here
// https://github.com/grpc/grpc/blob/master/doc/service_config.md
type ServiceConfig struct {
serviceconfig.Config
// LB is the load balancer the service providers recommends. The balancer
// specified via grpc.WithBalancerName will override this. This is deprecated;
// lbConfigs is preferred. If lbConfig and LB are both present, lbConfig
// will be used.
LB *string
// lbConfig is the service config's load balancing configuration. If
// lbConfig and LB are both present, lbConfig will be used.
lbConfig *lbConfig
// Methods contains a map for the methods in this service. If there is an
// exact match for a method (i.e. /service/method) in the map, use the
// corresponding MethodConfig. If there's no exact match, look for the
// default config for the service (/service/) and use the corresponding
// MethodConfig if it exists. Otherwise, the method has no MethodConfig to
// use.
Methods map[string]MethodConfig
// If a retryThrottlingPolicy is provided, gRPC will automatically throttle
// retry attempts and hedged RPCs when the clients ratio of failures to
// successes exceeds a threshold.
//
// For each server name, the gRPC client will maintain a token_count which is
// initially set to maxTokens, and can take values between 0 and maxTokens.
//
// Every outgoing RPC (regardless of service or method invoked) will change
// token_count as follows:
//
// - Every failed RPC will decrement the token_count by 1.
// - Every successful RPC will increment the token_count by tokenRatio.
//
// If token_count is less than or equal to maxTokens / 2, then RPCs will not
// be retried and hedged RPCs will not be sent.
retryThrottling *retryThrottlingPolicy
// healthCheckConfig must be set as one of the requirement to enable LB channel
// health check.
healthCheckConfig *healthCheckConfig
// rawJSONString stores service config json string that get parsed into
// this service config struct.
rawJSONString string
}
// healthCheckConfig defines the go-native version of the LB channel health check config.
type healthCheckConfig struct {
// serviceName is the service name to use in the health-checking request.
ServiceName string
}
type jsonRetryPolicy struct {
MaxAttempts int
InitialBackoff string
MaxBackoff string
BackoffMultiplier float64
RetryableStatusCodes []codes.Code
}
// retryThrottlingPolicy defines the go-native version of the retry throttling
// policy defined by the service config here:
// https://github.com/grpc/proposal/blob/master/A6-client-retries.md#integration-with-service-config
type retryThrottlingPolicy struct {
// The number of tokens starts at maxTokens. The token_count will always be
// between 0 and maxTokens.
//
// This field is required and must be greater than zero.
MaxTokens float64
// The amount of tokens to add on each successful RPC. Typically this will
// be some number between 0 and 1, e.g., 0.1.
//
// This field is required and must be greater than zero. Up to 3 decimal
// places are supported.
TokenRatio float64
}
func parseDuration(s *string) (*time.Duration, error) {
if s == nil {
return nil, nil
}
if !strings.HasSuffix(*s, "s") {
return nil, fmt.Errorf("malformed duration %q", *s)
}
ss := strings.SplitN((*s)[:len(*s)-1], ".", 3)
if len(ss) > 2 {
return nil, fmt.Errorf("malformed duration %q", *s)
}
// hasDigits is set if either the whole or fractional part of the number is
// present, since both are optional but one is required.
hasDigits := false
var d time.Duration
if len(ss[0]) > 0 {
i, err := strconv.ParseInt(ss[0], 10, 32)
if err != nil {
return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
}
d = time.Duration(i) * time.Second
hasDigits = true
}
if len(ss) == 2 && len(ss[1]) > 0 {
if len(ss[1]) > 9 {
return nil, fmt.Errorf("malformed duration %q", *s)
}
f, err := strconv.ParseInt(ss[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
}
for i := 9; i > len(ss[1]); i-- {
f *= 10
}
d += time.Duration(f)
hasDigits = true
}
if !hasDigits {
return nil, fmt.Errorf("malformed duration %q", *s)
}
return &d, nil
}
type jsonName struct {
Service string
Method string
}
var (
errDuplicatedName = errors.New("duplicated name")
errEmptyServiceNonEmptyMethod = errors.New("cannot combine empty 'service' and non-empty 'method'")
)
func (j jsonName) generatePath() (string, error) {
if j.Service == "" {
if j.Method != "" {
return "", errEmptyServiceNonEmptyMethod
}
return "", nil
}
res := "/" + j.Service + "/"
if j.Method != "" {
res += j.Method
}
return res, nil
}
// TODO(lyuxuan): delete this struct after cleaning up old service config implementation.
type jsonMC struct {
Name *[]jsonName
WaitForReady *bool
Timeout *string
MaxRequestMessageBytes *int64
MaxResponseMessageBytes *int64
RetryPolicy *jsonRetryPolicy
}
// TODO(lyuxuan): delete this struct after cleaning up old service config implementation.
type jsonSC struct {
LoadBalancingPolicy *string
LoadBalancingConfig *internalserviceconfig.BalancerConfig
MethodConfig *[]jsonMC
RetryThrottling *retryThrottlingPolicy
HealthCheckConfig *healthCheckConfig
}
func init() {
internal.ParseServiceConfig = parseServiceConfig
}
func parseServiceConfig(js string) *serviceconfig.ParseResult {
if len(js) == 0 {
return &serviceconfig.ParseResult{Err: fmt.Errorf("no JSON service config provided")}
}
var rsc jsonSC
err := json.Unmarshal([]byte(js), &rsc)
if err != nil {
logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
return &serviceconfig.ParseResult{Err: err}
}
sc := ServiceConfig{
LB: rsc.LoadBalancingPolicy,
Methods: make(map[string]MethodConfig),
retryThrottling: rsc.RetryThrottling,
healthCheckConfig: rsc.HealthCheckConfig,
rawJSONString: js,
}
if c := rsc.LoadBalancingConfig; c != nil {
sc.lbConfig = &lbConfig{
name: c.Name,
cfg: c.Config,
}
}
if rsc.MethodConfig == nil {
return &serviceconfig.ParseResult{Config: &sc}
}
paths := map[string]struct{}{}
for _, m := range *rsc.MethodConfig {
if m.Name == nil {
continue
}
d, err := parseDuration(m.Timeout)
if err != nil {
logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
return &serviceconfig.ParseResult{Err: err}
}
mc := MethodConfig{
WaitForReady: m.WaitForReady,
Timeout: d,
}
if mc.RetryPolicy, err = convertRetryPolicy(m.RetryPolicy); err != nil {
logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
return &serviceconfig.ParseResult{Err: err}
}
if m.MaxRequestMessageBytes != nil {
if *m.MaxRequestMessageBytes > int64(maxInt) {
mc.MaxReqSize = newInt(maxInt)
} else {
mc.MaxReqSize = newInt(int(*m.MaxRequestMessageBytes))
}
}
if m.MaxResponseMessageBytes != nil {
if *m.MaxResponseMessageBytes > int64(maxInt) {
mc.MaxRespSize = newInt(maxInt)
} else {
mc.MaxRespSize = newInt(int(*m.MaxResponseMessageBytes))
}
}
for i, n := range *m.Name {
path, err := n.generatePath()
if err != nil {
logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to methodConfig[%d]: %v", js, i, err)
return &serviceconfig.ParseResult{Err: err}
}
if _, ok := paths[path]; ok {
err = errDuplicatedName
logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to methodConfig[%d]: %v", js, i, err)
return &serviceconfig.ParseResult{Err: err}
}
paths[path] = struct{}{}
sc.Methods[path] = mc
}
}
if sc.retryThrottling != nil {
if mt := sc.retryThrottling.MaxTokens; mt <= 0 || mt > 1000 {
return &serviceconfig.ParseResult{Err: fmt.Errorf("invalid retry throttling config: maxTokens (%v) out of range (0, 1000]", mt)}
}
if tr := sc.retryThrottling.TokenRatio; tr <= 0 {
return &serviceconfig.ParseResult{Err: fmt.Errorf("invalid retry throttling config: tokenRatio (%v) may not be negative", tr)}
}
}
return &serviceconfig.ParseResult{Config: &sc}
}
func convertRetryPolicy(jrp *jsonRetryPolicy) (p *internalserviceconfig.RetryPolicy, err error) {
if jrp == nil {
return nil, nil
}
ib, err := parseDuration(&jrp.InitialBackoff)
if err != nil {
return nil, err
}
mb, err := parseDuration(&jrp.MaxBackoff)
if err != nil {
return nil, err
}
if jrp.MaxAttempts <= 1 ||
*ib <= 0 ||
*mb <= 0 ||
jrp.BackoffMultiplier <= 0 ||
len(jrp.RetryableStatusCodes) == 0 {
logger.Warningf("grpc: ignoring retry policy %v due to illegal configuration", jrp)
return nil, nil
}
rp := &internalserviceconfig.RetryPolicy{
MaxAttempts: jrp.MaxAttempts,
InitialBackoff: *ib,
MaxBackoff: *mb,
BackoffMultiplier: jrp.BackoffMultiplier,
RetryableStatusCodes: make(map[codes.Code]bool),
}
if rp.MaxAttempts > 5 {
// TODO(retry): Make the max maxAttempts configurable.
rp.MaxAttempts = 5
}
for _, code := range jrp.RetryableStatusCodes {
rp.RetryableStatusCodes[code] = true
}
return rp, nil
}
func min(a, b *int) *int {
if *a < *b {
return a
}
return b
}
func getMaxSize(mcMax, doptMax *int, defaultVal int) *int {
if mcMax == nil && doptMax == nil {
return &defaultVal
}
if mcMax != nil && doptMax != nil {
return min(mcMax, doptMax)
}
if mcMax != nil {
return mcMax
}
return doptMax
}
func newInt(b int) *int {
return &b
}
func init() {
internal.EqualServiceConfigForTesting = equalServiceConfig
}
// equalServiceConfig compares two configs. The rawJSONString field is ignored,
// because they may diff in white spaces.
//
// If any of them is NOT *ServiceConfig, return false.
func equalServiceConfig(a, b serviceconfig.Config) bool {
if a == nil && b == nil {
return true
}
aa, ok := a.(*ServiceConfig)
if !ok {
return false
}
bb, ok := b.(*ServiceConfig)
if !ok {
return false
}
aaRaw := aa.rawJSONString
aa.rawJSONString = ""
bbRaw := bb.rawJSONString
bb.rawJSONString = ""
defer func() {
aa.rawJSONString = aaRaw
bb.rawJSONString = bbRaw
}()
// Using reflect.DeepEqual instead of cmp.Equal because many balancer
// configs are unexported, and cmp.Equal cannot compare unexported fields
// from unexported structs.
return reflect.DeepEqual(aa, bb)
}