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processor.go
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processor.go
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package service
import (
"cmp"
"context"
"errors"
"fmt"
"log/slog"
"slices"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
const (
PacketTTL = 30 * time.Minute
)
var (
EventsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "ejaculation_counter",
Name: "events_total",
Help: "Total number of events triggered by messages.",
}, []string{"name", "action"})
EventsErrorTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "ejaculation_counter",
Name: "events_error_total",
Help: "Total number of errors when creating events.",
}, []string{"action"})
)
type processor struct {
Queue QueueReader
Reply Reply
Increment Increment
Update Update
Administration Administration
Actions []Action
Clock func() time.Time
}
type Processor interface {
Execute(ctx context.Context, packets <-chan Packet)
}
func NewProcessor(
queue QueueReader,
reply Reply,
increment Increment,
update Update,
administration Administration,
actions []Action,
clock func() time.Time,
) Processor {
return &processor{
Queue: queue,
Reply: reply,
Increment: increment,
Update: update,
Administration: administration,
Actions: actions,
Clock: clock,
}
}
func (ps *processor) Execute(ctx context.Context, packets <-chan Packet) {
for packet := range packets {
if ps.Clock().Sub(packet.Timestamp()) > PacketTTL {
slog.Warn("A message has been discarded as it is too old", slog.Any("message-timestamp", packet.Timestamp()))
ps.Queue.Ack(packet.Tag())
continue
}
switch p := packet.(type) {
case Tick:
go func() {
err := ps.Update.Do(ctx, UpdateEvent{
Year: p.Year,
Month: p.Month,
Day: p.Day,
})
if err != nil {
slog.Error("Failed to update", slog.Any("err", err))
ps.Queue.Reject(p.Tag())
return
}
ps.Queue.Ack(p.Tag())
}()
case Message:
go func() {
var result []actionResult
for _, action := range ps.Actions {
if !action.Target(p) {
continue
}
event, index, err := action.Event(ctx, p)
if err != nil {
slog.Error("Error in processing", slog.String("action", action.Name()), slog.Any("err", err))
EventsErrorTotal.WithLabelValues(action.Name()).Inc()
result = append(result, actionResult{
Event: ReplyErrorEvent{
InReplyToID: p.ID,
Acct: p.Account.Acct,
Visibility: p.Visibility,
ActionName: action.Name(),
},
})
continue
}
result = append(result, actionResult{event, index})
EventsTotal.WithLabelValues(event.Name(), action.Name()).Inc()
}
slices.SortFunc(result, func(a, b actionResult) int {
return cmp.Compare(a.Index, b.Index)
})
err := ps.doEvents(ctx, result)
if err != nil {
slog.Error("Failed to process", slog.Any("err", err))
ps.Queue.Reject(p.Tag())
return
}
ps.Queue.Ack(p.Tag())
}()
}
}
}
func (ps *processor) doEvents(ctx context.Context, result []actionResult) error {
var errs error
for _, r := range result {
switch event := r.Event.(type) {
case ReplyEvent:
err := ps.Reply.Send(ctx, event)
if err != nil {
errs = errors.Join(errs, err)
}
case ReplyErrorEvent:
err := ps.Reply.SendError(ctx, event)
if err != nil {
errs = errors.Join(errs, err)
}
case IncrementEvent:
err := ps.Increment.Do(ctx, event)
if err != nil {
errs = errors.Join(errs, err)
}
case AdministrationEvent:
err := ps.Administration.Do(ctx, event)
if err != nil {
slog.Error("Failed to execute administrative operation", slog.Any("err", err))
}
default:
errs = errors.Join(errs, fmt.Errorf("failed to process unknown event: %v", event.Name()))
}
}
return errs
}