| package context |
| |
| import ( |
| "context" |
| "time" |
| ) |
| |
| // Since looks up key, which should be a time.Time, and returns the duration |
| // since that time. If the key is not found, the value returned will be zero. |
| // This is helpful when inferring metrics related to context execution times. |
| func Since(ctx context.Context, key interface{}) time.Duration { |
| if startedAt, ok := ctx.Value(key).(time.Time); ok { |
| return time.Since(startedAt) |
| } |
| return 0 |
| } |
| |
| // GetStringValue returns a string value from the context. The empty string |
| // will be returned if not found. |
| func GetStringValue(ctx context.Context, key interface{}) (value string) { |
| if valuev, ok := ctx.Value(key).(string); ok { |
| value = valuev |
| } |
| return value |
| } |
