-
Notifications
You must be signed in to change notification settings - Fork 4.3k
/
serviceconfig.go
80 lines (68 loc) · 2.12 KB
/
serviceconfig.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
/*
*
* Copyright 2020 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 resolver
import (
"encoding/json"
"fmt"
xdsclient "google.golang.org/grpc/xds/internal/client"
)
const (
cdsName = "cds_experimental"
weightedTargetName = "weighted_target_experimental"
)
type serviceConfig struct {
LoadBalancingConfig balancerConfig `json:"loadBalancingConfig"`
}
type balancerConfig []map[string]interface{}
func newBalancerConfig(name string, config interface{}) balancerConfig {
return []map[string]interface{}{{name: config}}
}
type weightedCDSBalancerConfig struct {
Targets map[string]cdsWithWeight `json:"targets"`
}
type cdsWithWeight struct {
Weight uint32 `json:"weight"`
ChildPolicy balancerConfig `json:"childPolicy"`
}
type cdsBalancerConfig struct {
Cluster string `json:"cluster"`
}
func serviceUpdateToJSON(su xdsclient.ServiceUpdate) (string, error) {
// Even if WeightedCluster has only one entry, we still use weighted_target
// as top level balancer, to avoid switching top policy between CDS and
// weighted_target, causing TCP connection to be recreated.
targets := make(map[string]cdsWithWeight)
for name, weight := range su.WeightedCluster {
targets[name] = cdsWithWeight{
Weight: weight,
ChildPolicy: newBalancerConfig(cdsName, cdsBalancerConfig{Cluster: name}),
}
}
sc := serviceConfig{
LoadBalancingConfig: newBalancerConfig(
weightedTargetName, weightedCDSBalancerConfig{
Targets: targets,
},
),
}
bs, err := json.Marshal(sc)
if err != nil {
return "", fmt.Errorf("failed to marshal json: %v", err)
}
return string(bs), nil
}