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resolver: introduce attributes package and use it for Address and Sta…
…te (grpc#3151)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| /* | ||
| * | ||
| * Copyright 2019 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. | ||
| * | ||
| */ | ||
|
|
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| // Package attributes defines a generic key/value store used in various gRPC | ||
| // components. | ||
| // | ||
| // All APIs in this package are EXPERIMENTAL. | ||
| package attributes | ||
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| import "fmt" | ||
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| // Attributes is an immutable struct for storing and retrieving generic | ||
| // key/value pairs. Keys must be hashable, and users should define their own | ||
| // types for keys. | ||
| type Attributes struct { | ||
| m map[interface{}]interface{} | ||
| } | ||
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| // New returns a new Attributes containing all key/value pairs in kvs. If the | ||
| // same key appears multiple times, the last value overwrites all previous | ||
| // values for that key. Panics if len(kvs) is not even. | ||
| func New(kvs ...interface{}) *Attributes { | ||
| if len(kvs)%2 != 0 { | ||
| panic(fmt.Sprintf("attributes.New called with unexpected input: len(kvs) = %v", len(kvs))) | ||
| } | ||
| a := &Attributes{m: make(map[interface{}]interface{}, len(kvs)/2)} | ||
| for i := 0; i < len(kvs)/2; i++ { | ||
| a.m[kvs[i*2]] = kvs[i*2+1] | ||
| } | ||
| return a | ||
| } | ||
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| // WithValues returns a new Attributes containing all key/value pairs in a and | ||
| // kvs. Panics if len(kvs) is not even. If the same key appears multiple | ||
| // times, the last value overwrites all previous values for that key. To | ||
| // remove an existing key, use a nil value. | ||
| func (a *Attributes) WithValues(kvs ...interface{}) *Attributes { | ||
| if len(kvs)%2 != 0 { | ||
| panic(fmt.Sprintf("attributes.New called with unexpected input: len(kvs) = %v", len(kvs))) | ||
| } | ||
| n := &Attributes{m: make(map[interface{}]interface{}, len(a.m)+len(kvs)/2)} | ||
| for k, v := range a.m { | ||
| n.m[k] = v | ||
| } | ||
| for i := 0; i < len(kvs)/2; i++ { | ||
| n.m[kvs[i*2]] = kvs[i*2+1] | ||
| } | ||
| return n | ||
| } | ||
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| // Value returns the value associated with these attributes for key, or nil if | ||
| // no value is associated with key. | ||
| func (a *Attributes) Value(key interface{}) interface{} { | ||
| return a.m[key] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| /* | ||
| * | ||
| * Copyright 2019 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. | ||
| * | ||
| */ | ||
|
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| package attributes_test | ||
|
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| import ( | ||
| "fmt" | ||
|
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| "google.golang.org/grpc/attributes" | ||
| ) | ||
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| func ExampleAttributes() { | ||
| type keyOne struct{} | ||
| type keyTwo struct{} | ||
| a := attributes.New(keyOne{}, 1, keyTwo{}, "two") | ||
| fmt.Println("Key one:", a.Value(keyOne{})) | ||
| fmt.Println("Key two:", a.Value(keyTwo{})) | ||
| // Output: | ||
| // Key one: 1 | ||
| // Key two: two | ||
| } | ||
|
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| func ExampleAttributes_WithValues() { | ||
| type keyOne struct{} | ||
| type keyTwo struct{} | ||
| a := attributes.New(keyOne{}, 1) | ||
| a = a.WithValues(keyTwo{}, "two") | ||
| fmt.Println("Key one:", a.Value(keyOne{})) | ||
| fmt.Println("Key two:", a.Value(keyTwo{})) | ||
| // Output: | ||
| // Key one: 1 | ||
| // Key two: two | ||
| } |
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