traefik/vendor/google.golang.org/grpc/service_config.go

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2018-05-23 15:48:04 +00:00
/*
*
* 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"
"fmt"
"strconv"
"strings"
"time"
"google.golang.org/grpc/grpclog"
)
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 struct {
// WaitForReady indicates whether RPCs sent to this method should wait until
// the connection is ready by default (!failfast). The value specified via the
// gRPC client API will override the value set here.
WaitForReady *bool
// Timeout is the default timeout for RPCs sent to this method. The actual
// deadline used will be the minimum of the value specified here and the value
// set by the application via the gRPC client API. If either one is not set,
// then the other will be used. If neither is set, then the RPC has no deadline.
Timeout *time.Duration
// MaxReqSize is the maximum allowed payload size for an individual request in a
// stream (client->server) in bytes. The size which is measured is the serialized
// payload after per-message compression (but before stream compression) in bytes.
// The actual value used is the minimum of the value specified here and the value set
// by the application via the gRPC client API. If either one is not set, then the other
// will be used. If neither is set, then the built-in default is used.
MaxReqSize *int
// MaxRespSize is the maximum allowed payload size for an individual response in a
// stream (server->client) in bytes.
MaxRespSize *int
}
// 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 {
// LB is the load balancer the service providers recommends. The balancer specified
// via grpc.WithBalancer will override this.
LB *string
// 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
stickinessMetadataKey *string
}
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
}
func (j jsonName) generatePath() (string, bool) {
if j.Service == nil {
return "", false
}
res := "/" + *j.Service + "/"
if j.Method != nil {
res += *j.Method
}
return res, true
}
// 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
}
// TODO(lyuxuan): delete this struct after cleaning up old service config implementation.
type jsonSC struct {
LoadBalancingPolicy *string
StickinessMetadataKey *string
MethodConfig *[]jsonMC
}
func parseServiceConfig(js string) (ServiceConfig, error) {
var rsc jsonSC
err := json.Unmarshal([]byte(js), &rsc)
if err != nil {
grpclog.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
return ServiceConfig{}, err
}
sc := ServiceConfig{
LB: rsc.LoadBalancingPolicy,
Methods: make(map[string]MethodConfig),
stickinessMetadataKey: rsc.StickinessMetadataKey,
}
if rsc.MethodConfig == nil {
return sc, nil
}
for _, m := range *rsc.MethodConfig {
if m.Name == nil {
continue
}
d, err := parseDuration(m.Timeout)
if err != nil {
grpclog.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
return ServiceConfig{}, err
}
mc := MethodConfig{
WaitForReady: m.WaitForReady,
Timeout: d,
}
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 _, n := range *m.Name {
if path, valid := n.generatePath(); valid {
sc.Methods[path] = mc
}
}
}
return sc, 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
}