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/*
*
* 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 serviceconfig
import (
"encoding/json"
"fmt"
"testing"
"github.com/google/go-cmp/cmp"
"google.golang.org/grpc/balancer"
externalserviceconfig "google.golang.org/grpc/serviceconfig"
)
type testBalancerConfigType struct {
externalserviceconfig.LoadBalancingConfig `json:"-"`
Check bool `json:"check"`
}
var testBalancerConfig = testBalancerConfigType{Check: true}
const (
testBalancerBuilderName = "test-bb"
testBalancerBuilderNotParserName = "test-bb-not-parser"
testBalancerConfigJSON = `{"check":true}`
)
type testBalancerBuilder struct {
balancer.Builder
}
func (testBalancerBuilder) ParseConfig(js json.RawMessage) (externalserviceconfig.LoadBalancingConfig, error) {
if string(js) != testBalancerConfigJSON {
return nil, fmt.Errorf("unexpected config json")
}
return testBalancerConfig, nil
}
func (testBalancerBuilder) Name() string {
return testBalancerBuilderName
}
type testBalancerBuilderNotParser struct {
balancer.Builder
}
func (testBalancerBuilderNotParser) Name() string {
return testBalancerBuilderNotParserName
}
func init() {
balancer.Register(testBalancerBuilder{})
balancer.Register(testBalancerBuilderNotParser{})
}
func TestBalancerConfigUnmarshalJSON(t *testing.T) {
tests := []struct {
name string
json string
want BalancerConfig
wantErr bool
}{
{
name: "empty json",
json: "",
wantErr: true,
},
{
// The config should be a slice of maps, but each map should have
// exactly one entry.
name: "more than one entry for a map",
json: `[{"balancer1":"1","balancer2":"2"}]`,
wantErr: true,
},
{
name: "no balancer registered",
json: `[{"balancer1":"1"},{"balancer2":"2"}]`,
wantErr: true,
},
{
name: "OK",
json: fmt.Sprintf("[{%q: %v}]", testBalancerBuilderName, testBalancerConfigJSON),
want: BalancerConfig{
Name: testBalancerBuilderName,
Config: testBalancerConfig,
},
wantErr: false,
},
{
name: "first balancer not registered",
json: fmt.Sprintf(`[{"balancer1":"1"},{%q: %v}]`, testBalancerBuilderName, testBalancerConfigJSON),
want: BalancerConfig{
Name: testBalancerBuilderName,
Config: testBalancerConfig,
},
wantErr: false,
},
{
name: "balancer registered but builder not parser",
json: fmt.Sprintf("[{%q: %v}]", testBalancerBuilderNotParserName, testBalancerConfigJSON),
want: BalancerConfig{
Name: testBalancerBuilderNotParserName,
Config: nil,
},
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var bc BalancerConfig
if err := bc.UnmarshalJSON([]byte(tt.json)); (err != nil) != tt.wantErr {
t.Errorf("UnmarshalJSON() error = %v, wantErr %v", err, tt.wantErr)
}
if !cmp.Equal(bc, tt.want) {
t.Errorf("diff: %v", cmp.Diff(bc, tt.want))
}
})
}
}
func TestBalancerConfigMarshalJSON(t *testing.T) {
tests := []struct {
name string
bc BalancerConfig
wantJSON string
}{
{
name: "OK",
bc: BalancerConfig{
Name: testBalancerBuilderName,
Config: testBalancerConfig,
},
wantJSON: `[{"test-bb": {"check":true}}]`,
},
{
name: "OK config is nil",
bc: BalancerConfig{
Name: testBalancerBuilderNotParserName,
Config: nil, // nil should be marshalled to an empty config "{}".
},
wantJSON: `[{"test-bb-not-parser": {}}]`,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
b, err := tt.bc.MarshalJSON()
if err != nil {
t.Fatalf("failed to marshal: %v", err)
}
if str := string(b); str != tt.wantJSON {
t.Fatalf("got str %q, want %q", str, tt.wantJSON)
}
var bc BalancerConfig
if err := bc.UnmarshalJSON(b); err != nil {
t.Errorf("failed to unmarshal: %v", err)
}
if !cmp.Equal(bc, tt.bc) {
t.Errorf("diff: %v", cmp.Diff(bc, tt.bc))
}
})
}
}
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