|
| 1 | +package eventlog |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "context" |
| 6 | + cloudevents "github.com/cloudevents/sdk-go/v2" |
| 7 | + "github.com/hashicorp/go-multierror" |
| 8 | + "github.com/jsiebens/ionscale/internal/config" |
| 9 | + "github.com/jsiebens/ionscale/internal/util" |
| 10 | + "go.uber.org/zap" |
| 11 | + "io" |
| 12 | + "os" |
| 13 | + "path/filepath" |
| 14 | + "sync" |
| 15 | + "time" |
| 16 | +) |
| 17 | + |
| 18 | +const ( |
| 19 | + stdout = "/dev/stdout" |
| 20 | + stderr = "/dev/stderr" |
| 21 | + devnull = "/dev/null" |
| 22 | +) |
| 23 | + |
| 24 | +type Events []cloudevents.Event |
| 25 | + |
| 26 | +func (e *Events) Add(event cloudevents.Event) { |
| 27 | + x := append(*e, event) |
| 28 | + *e = x |
| 29 | +} |
| 30 | + |
| 31 | +type Eventer interface { |
| 32 | + Send(ctx context.Context, events ...cloudevents.Event) error |
| 33 | +} |
| 34 | + |
| 35 | +type eventer struct { |
| 36 | + source string |
| 37 | + sinks []sink |
| 38 | +} |
| 39 | + |
| 40 | +func (e *eventer) Send(ctx context.Context, events ...cloudevents.Event) error { |
| 41 | + groupID := util.NextIDString() |
| 42 | + now := time.Now() |
| 43 | + |
| 44 | + for _, event := range events { |
| 45 | + event.SetSource(e.source) |
| 46 | + event.SetID(util.NextIDString()) |
| 47 | + event.SetTime(now) |
| 48 | + event.SetExtension("eventGroupID", groupID) |
| 49 | + } |
| 50 | + |
| 51 | + var r *multierror.Error |
| 52 | + for _, s := range e.sinks { |
| 53 | + r = multierror.Append(r, s.process(ctx, events...)) |
| 54 | + } |
| 55 | + |
| 56 | + return r.ErrorOrNil() |
| 57 | +} |
| 58 | + |
| 59 | +type sink interface { |
| 60 | + process(context.Context, ...cloudevents.Event) error |
| 61 | +} |
| 62 | + |
| 63 | +var ( |
| 64 | + _globalMu sync.RWMutex |
| 65 | + _globalE Eventer = &eventer{} |
| 66 | +) |
| 67 | + |
| 68 | +func Configure(c *config.Config) error { |
| 69 | + var sinks []sink |
| 70 | + |
| 71 | + if c.Events.Log.Enabled { |
| 72 | + sinks = append(sinks, &zapSink{logger: zap.L().Named("events").WithOptions(zap.AddCallerSkip(3))}) |
| 73 | + } |
| 74 | + |
| 75 | + if c.Events.File.Enabled { |
| 76 | + switch c.Events.File.Path { |
| 77 | + case devnull: |
| 78 | + // ignore |
| 79 | + case stderr: |
| 80 | + sinks = append(sinks, &writerSink{w: os.Stderr}) |
| 81 | + case stdout: |
| 82 | + sinks = append(sinks, &writerSink{w: os.Stdout}) |
| 83 | + default: |
| 84 | + abs, err := filepath.Abs(c.Events.File.Path) |
| 85 | + if err != nil { |
| 86 | + return err |
| 87 | + } |
| 88 | + |
| 89 | + sinks = append(sinks, &fileSink{ |
| 90 | + path: abs, |
| 91 | + fileName: c.Events.File.FileName, |
| 92 | + maxBytes: c.Events.File.MaxBytes, |
| 93 | + maxDuration: c.Events.File.MaxDuration, |
| 94 | + maxFiles: c.Events.File.MaxFiles, |
| 95 | + }) |
| 96 | + } |
| 97 | + } |
| 98 | + |
| 99 | + _globalMu.Lock() |
| 100 | + defer _globalMu.Unlock() |
| 101 | + _globalE = &eventer{ |
| 102 | + source: c.ServerUrl, |
| 103 | + sinks: sinks, |
| 104 | + } |
| 105 | + |
| 106 | + return nil |
| 107 | +} |
| 108 | + |
| 109 | +func Send(ctx context.Context, events ...cloudevents.Event) { |
| 110 | + _globalMu.RLock() |
| 111 | + l := _globalE |
| 112 | + _globalMu.RUnlock() |
| 113 | + |
| 114 | + if err := l.Send(ctx, events...); err != nil { |
| 115 | + zap.L().Error("error while processing event", zap.Error(err)) |
| 116 | + } |
| 117 | +} |
| 118 | + |
| 119 | +func writeJSONLine(w io.Writer, events ...cloudevents.Event) (int, error) { |
| 120 | + var payload bytes.Buffer |
| 121 | + |
| 122 | + for _, event := range events { |
| 123 | + eventJson, err := event.MarshalJSON() |
| 124 | + if err != nil { |
| 125 | + return 0, err |
| 126 | + } |
| 127 | + |
| 128 | + payload.Write(eventJson) |
| 129 | + payload.Write([]byte("\n")) |
| 130 | + } |
| 131 | + |
| 132 | + return w.Write(payload.Bytes()) |
| 133 | +} |
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