forked from gazette/core
/
replica.go
55 lines (44 loc) · 1.28 KB
/
replica.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
package consumer
import (
"context"
etcd "github.com/coreos/etcd/client"
log "github.com/sirupsen/logrus"
"github.com/LiveRamp/gazette/pkg/recoverylog"
)
type replica struct {
shard ShardID
player *recoverylog.Player
servingCh chan struct{} // Blocks until replica.serve exists.
}
func newReplica(shard *shard, runner *Runner, tree *etcd.Node) (*replica, error) {
var hints, err = loadHintsFromEtcd(shard.id, runner, tree)
if err != nil {
return nil, err
}
log.WithFields(log.Fields{"shard": shard.id, "hints": hints, "dir": shard.localDir}).
Info("replicating with hints")
player, err := recoverylog.NewPlayer(hints, shard.localDir)
if err != nil {
return nil, err
}
player.SetCancelChan(shard.cancelCh)
return &replica{
shard: shard.id,
player: player,
servingCh: make(chan struct{}),
}, nil
}
func (r *replica) serve(runner *Runner) {
defer close(r.servingCh)
if err := r.player.Play(runner.Gazette); err != nil {
switch err {
case context.Canceled:
// Do nothing, the shard is no longer being processed by this pod.
default:
log.WithFields(log.Fields{"shard": r.shard, "err": err}).Error("replication failed")
}
abort(runner, r.shard)
} else {
log.WithFields(log.Fields{"shard": r.shard}).Info("finished serving replica")
}
}