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rls_lb_config.go
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/
rls_lb_config.go
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/*
*
* Copyright 2021 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 e2e
import (
"errors"
"fmt"
"google.golang.org/grpc/balancer"
rlspb "google.golang.org/grpc/internal/proto/grpc_lookup_v1"
internalserviceconfig "google.golang.org/grpc/internal/serviceconfig"
"google.golang.org/grpc/serviceconfig"
"google.golang.org/protobuf/encoding/protojson"
)
// RLSConfig is a utility type to build service config for the RLS LB policy.
type RLSConfig struct {
RouteLookupConfig *rlspb.RouteLookupConfig
RouteLookupChannelServiceConfig string
ChildPolicy *internalserviceconfig.BalancerConfig
ChildPolicyConfigTargetFieldName string
}
// ServiceConfigJSON generates service config with a load balancing config
// corresponding to the RLS LB policy.
func (c *RLSConfig) ServiceConfigJSON() (string, error) {
m := protojson.MarshalOptions{
Multiline: true,
Indent: " ",
UseProtoNames: true,
}
routeLookupCfg, err := m.Marshal(c.RouteLookupConfig)
if err != nil {
return "", err
}
childPolicy, err := c.ChildPolicy.MarshalJSON()
if err != nil {
return "", err
}
return fmt.Sprintf(`
{
"loadBalancingConfig": [
{
"rls_experimental": {
"routeLookupConfig": %s,
"routeLookupChannelServiceConfig": %s,
"childPolicy": %s,
"childPolicyConfigTargetFieldName": %q
}
}
]
}`, string(routeLookupCfg), c.RouteLookupChannelServiceConfig, string(childPolicy), c.ChildPolicyConfigTargetFieldName), nil
}
// LoadBalancingConfig generates load balancing config which can used as part of
// a ClientConnState update to the RLS LB policy.
func (c *RLSConfig) LoadBalancingConfig() (serviceconfig.LoadBalancingConfig, error) {
m := protojson.MarshalOptions{
Multiline: true,
Indent: " ",
UseProtoNames: true,
}
routeLookupCfg, err := m.Marshal(c.RouteLookupConfig)
if err != nil {
return nil, err
}
childPolicy, err := c.ChildPolicy.MarshalJSON()
if err != nil {
return nil, err
}
lbConfigJSON := fmt.Sprintf(`
{
"routeLookupConfig": %s,
"routeLookupChannelServiceConfig": %s,
"childPolicy": %s,
"childPolicyConfigTargetFieldName": %q
}`, string(routeLookupCfg), c.RouteLookupChannelServiceConfig, string(childPolicy), c.ChildPolicyConfigTargetFieldName)
builder := balancer.Get("rls_experimental")
if builder == nil {
return nil, errors.New("balancer builder not found for RLS LB policy")
}
parser := builder.(balancer.ConfigParser)
return parser.ParseConfig([]byte(lbConfigJSON))
}