107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
package server
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import (
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"context"
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"errors"
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"fmt"
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"github.com/go-redsync/redsync/v4"
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redsyncgoredis "github.com/go-redsync/redsync/v4/redis/goredis/v9"
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"github.com/redis/go-redis/v9"
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"go.uber.org/zap"
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)
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type lockRedisService struct {
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rs *redsync.Redsync
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}
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var (
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errLockRedisNotObtained = newServiceError(Conflict, errors.New("lock service: could not obtain lock"))
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errLockRedisNotReleased = newServiceError(Conflict, errors.New("lock service: could not release lock"))
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)
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func newLockRedisService(lc *lockConfig) (lockService, error) {
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zap.L().Info("Initialized REDIS locking service")
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var err error
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var redisOptions *redis.Options
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redisOptions, err = redis.ParseURL(lc.redisUrl)
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if err != nil {
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zap.L().Sugar().Fatalf("Cannot parse REDIS URL '%s' to set up locking. Reason: %s", lc.redisUrl, err.Error())
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}
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c := redis.NewClient(redisOptions)
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if err = c.Ping(context.Background()).Err(); err != nil {
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return nil, newServiceError(General, fmt.Errorf("lock service: failed to connect to REDIS. Reason: %w", err))
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}
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pool := redsyncgoredis.NewPool(c)
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rs := redsync.New(pool)
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return &lockRedisService{rs: rs}, nil
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}
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func (s *lockRedisService) lock(ctx context.Context, resource string) (appLock, error) {
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return s.lockWithOptions(ctx, resource, nil)
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}
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func (s *lockRedisService) lockWithOptions(ctx context.Context, resource string, options ...appLockOption) (appLock, error) {
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if resource == "" {
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return nil, errorValidationNotBlank
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}
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var rsOptions []redsync.Option
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if options != nil {
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lockOptions := &appLockOptions{}
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for _, o := range options {
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o.Apply(lockOptions)
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}
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if lockOptions.ttl != nil {
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rsOptions = append(rsOptions, redsync.WithExpiry(*lockOptions.ttl))
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}
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if lockOptions.maxRetries != nil {
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rsOptions = append(rsOptions, redsync.WithTries(*lockOptions.maxRetries))
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}
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if lockOptions.retryDelay != nil {
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rsOptions = append(rsOptions, redsync.WithRetryDelay(*lockOptions.retryDelay))
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}
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}
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mu := s.rs.NewMutex(resource, rsOptions...)
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zap.L().Sugar().Debugf("Trying to lock '%s'", resource)
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if err := mu.LockContext(ctx); err != nil {
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return nil, errLockRedisNotObtained
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}
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zap.L().Sugar().Debugf("Locked '%s'", resource)
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l := &redisLock{
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mu: mu,
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}
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return l, nil
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}
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var _ appLock = (*redisLock)(nil)
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type redisLock struct {
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mu *redsync.Mutex
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}
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func (r redisLock) unlock(ctx context.Context) error {
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zap.L().Sugar().Debugf("Unlocking '%s'", r.mu.Name())
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unlocked, err := r.mu.UnlockContext(ctx)
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if err != nil {
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return errLockRedisNotReleased
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}
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if !unlocked {
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return errLockRedisNotReleased
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}
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return nil
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}
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