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Altered to have a struct owning the connection to NATS
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,82 +1,55 @@ | ||
| package event | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "errors" | ||
| "log" | ||
| "sync" | ||
|
|
||
| "github.com/nats-io/nats.go" | ||
| "github.com/hashicorp/go-hclog" | ||
| "sync" | ||
| ) | ||
|
|
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| const NATS_RECONNECT_BUF_SIZE = 5*1024*1024 | ||
|
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| type chanHolder struct { | ||
| Ch interface{} | ||
| } | ||
| type NatsBus struct { | ||
| logger hclog.Logger | ||
|
|
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| var ( | ||
| conn *nats.Conn | ||
| subCh []chanHolder | ||
| mu sync.Mutex | ||
| ) | ||
| } | ||
|
|
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| func Connect(server string) error { | ||
| mu.Lock() | ||
| defer mu.Unlock() | ||
| func NewNatsBus(logger hclog.Logger) *NatsBus { | ||
| return &NatsBus{ | ||
| logger: logger, | ||
| } | ||
| } | ||
|
|
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| if conn != nil { | ||
| func (nb *NatsBus) Connect(server string) error { | ||
| nb.mu.Lock() | ||
| defer nb.mu.Unlock() | ||
|
|
||
| if nb.conn != nil { | ||
| return errors.New("already connected") | ||
| } | ||
|
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| c, err := nats.Connect(server, nats.ReconnectBufSize(NATS_RECONNECT_BUF_SIZE)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| conn = c | ||
| subCh = make([]chanHolder, 0) | ||
| nb.conn = c | ||
|
|
||
| return nil | ||
| } | ||
|
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| func Subscribe[T any](topic string) (chan T, error) { | ||
| ch := make(chan T) | ||
| _, err := conn.Subscribe(topic, func(m *nats.Msg) { | ||
| var msg T | ||
| decoder := json.NewDecoder(bytes.NewReader(m.Data)) | ||
| decoder.DisallowUnknownFields() | ||
| err := decoder.Decode(&msg) | ||
| if err != nil { | ||
| log.Printf("Error unmarshalling message: %v", err) | ||
| return | ||
| } | ||
| ch <- msg | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| mu.Lock() | ||
| subCh = append(subCh, chanHolder{Ch: ch}) | ||
| mu.Unlock() | ||
|
|
||
| return ch, nil | ||
| } | ||
|
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| func Publish[T any](msg T, topic string) error { | ||
| // Not a method due to Golang limitations on generics there, so we just pass the bus as a parameter. | ||
| func Publish[T any](nb *NatsBus, msg T, topic string) error { | ||
| data, err := json.Marshal(msg) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| log.Printf("Publishing message to %s: %s", topic, string(data)) | ||
| return conn.Publish(topic, data) | ||
| nb.logger.Trace("Publishing message", "topic", topic, "data", string(data)) | ||
| return nb.conn.Publish(topic, data) | ||
| } | ||
|
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||
| func Close() { | ||
| conn.Close() | ||
| for _, holder := range subCh { | ||
| if ch, ok := holder.Ch.(chan interface{}); ok { | ||
| close(ch) | ||
| } | ||
| } | ||
| func (nb *NatsBus) Close() { | ||
| nb.conn.Close() | ||
| } |
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