bouncer/internal/queue/redis/adapter.go
William Petit e66938f1d3
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feat: initial commit
2023-05-21 22:27:25 +02:00

168 lines
3.4 KiB
Go

package redis
import (
"context"
"strconv"
"strings"
"time"
"forge.cadoles.com/cadoles/bouncer/internal/queue"
"github.com/pkg/errors"
"github.com/redis/go-redis/v9"
)
const (
keyPrefixQueue = "queue"
)
type Adapter struct {
client redis.UniversalClient
txMaxRetry int
}
// Refresh implements queue.Adapter
func (a *Adapter) Refresh(ctx context.Context, queueName string, keepAlive time.Duration) error {
lastSeenKey := lastSeenKey(queueName)
rankKey := rankKey(queueName)
err := withTx(ctx, a.client, func(ctx context.Context, tx *redis.Tx) error {
expires := time.Now().UTC().Add(-keepAlive)
cmd := tx.ZRangeByScore(ctx, lastSeenKey, &redis.ZRangeBy{
Min: "0",
Max: strconv.FormatInt(expires.Unix(), 10),
})
members, err := cmd.Result()
if err != nil {
return errors.WithStack(err)
}
if len(members) == 0 {
return nil
}
anyMembers := make([]any, len(members))
for i, m := range members {
anyMembers[i] = m
}
if err := tx.ZRem(ctx, rankKey, anyMembers...).Err(); err != nil {
return errors.WithStack(err)
}
if err := tx.ZRem(ctx, lastSeenKey, anyMembers...).Err(); err != nil {
return errors.WithStack(err)
}
return nil
}, rankKey, lastSeenKey)
if err != nil {
return errors.WithStack(err)
}
return nil
}
// Touch implements queue.Adapter
func (a *Adapter) Touch(ctx context.Context, queueName string, sessionId string) (int64, error) {
lastSeenKey := lastSeenKey(queueName)
rankKey := rankKey(queueName)
var rank int64
retry := a.txMaxRetry
for retry > 0 {
err := withTx(ctx, a.client, func(ctx context.Context, tx *redis.Tx) error {
now := time.Now().UTC().Unix()
err := tx.ZAddNX(ctx, rankKey, redis.Z{Score: float64(now), Member: sessionId}).Err()
if err != nil {
return errors.WithStack(err)
}
err = tx.ZAdd(ctx, lastSeenKey, redis.Z{Score: float64(now), Member: sessionId}).Err()
if err != nil {
return errors.WithStack(err)
}
val, err := tx.ZRank(ctx, rankKey, sessionId).Result()
if err != nil {
return errors.WithStack(err)
}
rank = val
return nil
}, rankKey, lastSeenKey)
if err != nil {
if errors.Is(err, redis.Nil) && retry > 0 {
retry--
continue
}
return 0, errors.WithStack(err)
}
break
}
return rank, nil
}
// Status implements queue.Adapter
func (a *Adapter) Status(ctx context.Context, queueName string) (*queue.Status, error) {
rankKey := rankKey(queueName)
status := &queue.Status{}
cmd := a.client.ZCard(ctx, rankKey)
if err := cmd.Err(); err != nil {
return nil, errors.WithStack(err)
}
status.Sessions = cmd.Val()
return status, nil
}
func NewAdapter(client redis.UniversalClient, txMaxRetry int) *Adapter {
return &Adapter{
client: client,
txMaxRetry: txMaxRetry,
}
}
var _ queue.Adapter = &Adapter{}
func key(parts ...string) string {
return strings.Join(parts, ":")
}
func rankKey(queueName string) string {
return key(keyPrefixQueue, queueName, "rank")
}
func lastSeenKey(queueName string) string {
return key(keyPrefixQueue, queueName, "last_seen")
}
func withTx(ctx context.Context, client redis.UniversalClient, fn func(ctx context.Context, tx *redis.Tx) error, keys ...string) error {
txf := func(tx *redis.Tx) error {
if err := fn(ctx, tx); err != nil {
return errors.WithStack(err)
}
return nil
}
err := client.Watch(ctx, txf, keys...)
if err != nil {
return errors.WithStack(err)
}
return nil
}