| 14 | ) |
| 15 | |
| 16 | func log(level Severity, msg string, tracer *ContextTracer) { |
| 17 | if !started.IsSet() { |
| 18 | // a bit resource intense, but keeps logs before logging started. |
| 19 | // TODO: create option to disable logging |
| 20 | go func() { |
| 21 | <-startedSignal |
| 22 | log(level, msg, tracer) |
| 23 | }() |
| 24 | return |
| 25 | } |
| 26 | |
| 27 | // Check log level. |
| 28 | if uint32(level) < atomic.LoadUint32(logLevel) { |
| 29 | return |
| 30 | } |
| 31 | |
| 32 | // get time |
| 33 | now := time.Now() |
| 34 | |
| 35 | // get file and line |
| 36 | _, file, line, ok := runtime.Caller(2) |
| 37 | if !ok { |
| 38 | file = "" |
| 39 | line = 0 |
| 40 | } else { |
| 41 | if len(file) > 3 { |
| 42 | file = file[:len(file)-3] |
| 43 | } else { |
| 44 | file = "" |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | // create log object |
| 49 | log := &logLine{ |
| 50 | msg: msg, |
| 51 | tracer: tracer, |
| 52 | level: level, |
| 53 | timestamp: now, |
| 54 | file: file, |
| 55 | line: line, |
| 56 | } |
| 57 | |
| 58 | // send log to processing |
| 59 | select { |
| 60 | case logBuffer <- log: |
| 61 | default: |
| 62 | forceEmptyingLoop: |
| 63 | // force empty buffer until we can send to it |
| 64 | for { |
| 65 | select { |
| 66 | case forceEmptyingOfBuffer <- struct{}{}: |
| 67 | case logBuffer <- log: |
| 68 | break forceEmptyingLoop |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | // wake up writer if necessary |