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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| package eventing | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "time" | ||
|
|
||
| "github.com/jackc/pgx" | ||
|
|
||
| "github.com/TheLab-ms/profile/internal/conf" | ||
| ) | ||
|
|
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| const migration = ` | ||
| CREATE TABLE IF NOT EXISTS profile_events ( | ||
| id integer primary key, | ||
| time timestamp not null, | ||
| email text not null, | ||
| reason text not null, | ||
| message text not null | ||
| ); | ||
| CREATE INDEX IF NOT EXISTS idx_profile_events_time ON profile_events (time); | ||
| ` | ||
|
|
||
| type Sink struct { | ||
| buffer chan *event | ||
| } | ||
|
|
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| func NewSink(env *conf.Env) (*Sink, error) { | ||
| s := &Sink{} | ||
| if env.EventPsqlAddr == "" { | ||
| return s, nil | ||
| } | ||
|
|
||
| db, err := pgx.Connect(pgx.ConnConfig{ | ||
| Host: env.EventPsqlAddr, | ||
| User: env.EventPsqlUsername, | ||
| Password: env.EventPsqlPassword, | ||
| }) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("constructing db client: %w", err) | ||
| } | ||
|
|
||
| _, err = db.Exec(migration) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("db migration: %w", err) | ||
| } | ||
|
|
||
| // Flush messages out to postgres | ||
| s.buffer = make(chan *event, env.EventBufferLength) | ||
| go func() { | ||
| defer db.Close() | ||
|
|
||
| for event := range s.buffer { | ||
| _, err := db.Exec("INSERT INTO profile_events (time, email, reason, message) VALUES ($1, $2, $3, $4)", event.Timestamp, event.Email, event.Reason, event.Message) | ||
| if err != nil { | ||
| log.Printf("error while flushing event to postgres: %s", err) // it would be a good idea to retry here | ||
| } | ||
|
|
||
| // don't send messages too often | ||
| // batching would be nice, this is easier to implement | ||
| time.Sleep(time.Second) | ||
| } | ||
| }() | ||
|
|
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| return s, nil | ||
| } | ||
|
|
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| func (s *Sink) Publish(email, reason, templ string, args ...any) { | ||
| if s.buffer == nil { | ||
| return | ||
| } | ||
| s.buffer <- &event{ | ||
| Timestamp: time.Now(), | ||
| Email: email, | ||
| Reason: reason, | ||
| Message: fmt.Sprintf(templ, args...), | ||
| } | ||
| } | ||
|
|
||
| type event struct { | ||
| Timestamp time.Time | ||
| Email string | ||
| Reason string | ||
| Message string | ||
| } |
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