| // Copyright 2017, OpenCensus 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 tag_test |
| |
| import ( |
| "context" |
| "log" |
| |
| "go.opencensus.io/tag" |
| ) |
| |
| var ( |
| tagMap *tag.Map |
| ctx context.Context |
| key tag.Key |
| ) |
| |
| func ExampleNewKey() { |
| // Get a key to represent user OS. |
| key, err := tag.NewKey("example.com/keys/user-os") |
| if err != nil { |
| log.Fatal(err) |
| } |
| _ = key // use key |
| } |
| |
| func ExampleNew() { |
| osKey, err := tag.NewKey("example.com/keys/user-os") |
| if err != nil { |
| log.Fatal(err) |
| } |
| userIDKey, err := tag.NewKey("example.com/keys/user-id") |
| if err != nil { |
| log.Fatal(err) |
| } |
| |
| ctx, err := tag.New(ctx, |
| tag.Insert(osKey, "macOS-10.12.5"), |
| tag.Upsert(userIDKey, "cde36753ed"), |
| ) |
| if err != nil { |
| log.Fatal(err) |
| } |
| |
| _ = ctx // use context |
| } |
| |
| func ExampleNew_replace() { |
| ctx, err := tag.New(ctx, |
| tag.Insert(key, "macOS-10.12.5"), |
| tag.Upsert(key, "macOS-10.12.7"), |
| ) |
| if err != nil { |
| log.Fatal(err) |
| } |
| |
| _ = ctx // use context |
| } |
| |
| func ExampleNewContext() { |
| // Propagate the tag map in the current context. |
| ctx := tag.NewContext(context.Background(), tagMap) |
| |
| _ = ctx // use context |
| } |
| |
| func ExampleFromContext() { |
| tagMap := tag.FromContext(ctx) |
| |
| _ = tagMap // use the tag map |
| } |
| |
| func ExampleDo() { |
| ctx, err := tag.New(ctx, |
| tag.Insert(key, "macOS-10.12.5"), |
| tag.Upsert(key, "macOS-10.12.7"), |
| ) |
| if err != nil { |
| log.Fatal(err) |
| } |
| tag.Do(ctx, func(ctx context.Context) { |
| _ = ctx // use context |
| }) |
| } |