update log README
code examples updated.
sbl
8 years ago
| 12 | 12 | Typical application logging. |
| 13 | 13 | |
| 14 | 14 | ```go |
| 15 | import "github.com/go-kit/kit/log" | |
| 15 | import ( | |
| 16 | "os" | |
| 17 | ||
| 18 | "github.com/go-kit/kit/log" | |
| 19 | ) | |
| 16 | 20 | |
| 17 | 21 | func main() { |
| 18 | logger := log.NewPrefixLogger(os.Stderr) | |
| 22 | logger := log.NewLogfmtLogger(os.Stderr) | |
| 19 | 23 | logger.Log("question", "what is the meaning of life?", "answer", 42) |
| 20 | 24 | } |
| 21 | 25 | ``` |
| 24 | 28 | |
| 25 | 29 | ```go |
| 26 | 30 | func handle(logger log.Logger, req *Request) { |
| 27 | logger = log.With(logger, "txid", req.TransactionID, "query", req.Query) | |
| 28 | logger.Log() | |
| 31 | ctx := log.NewContext(logger).With("txid", req.TransactionID, "query", req.Query) | |
| 32 | ctx.Log() | |
| 29 | 33 | |
| 30 | answer, err := process(logger, req.Query) | |
| 34 | answer, err := process(ctx, req.Query) | |
| 31 | 35 | if err != nil { |
| 32 | logger.Log("err", err) | |
| 36 | ctx.Log("err", err) | |
| 33 | 37 | return |
| 34 | 38 | } |
| 35 | 39 | |
| 36 | logger.Log("answer", answer) | |
| 40 | ctx.Log("answer", answer) | |
| 37 | 41 | } |
| 38 | 42 | ``` |
| 39 | 43 | |