-
Notifications
You must be signed in to change notification settings - Fork 274
/
piece_seed_stream.go
153 lines (141 loc) · 4.58 KB
/
piece_seed_stream.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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
* Copyright 2020 The Dragonfly Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package client
import (
"context"
"d7y.io/dragonfly/v2/internal/dferrors"
logger "d7y.io/dragonfly/v2/internal/dflog"
"d7y.io/dragonfly/v2/pkg/rpc"
"d7y.io/dragonfly/v2/pkg/rpc/cdnsystem"
"github.com/pkg/errors"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type PieceSeedStream struct {
// client for one target
sc *cdnClient
ctx context.Context
hashKey string
sr *cdnsystem.SeedRequest
opts []grpc.CallOption
// stream for one client
stream cdnsystem.Seeder_ObtainSeedsClient
// server list which cannot serve
failedServers []string
rpc.RetryMeta
}
func newPieceSeedStream(ctx context.Context, sc *cdnClient, hashKey string, sr *cdnsystem.SeedRequest, opts []grpc.CallOption) (*PieceSeedStream, error) {
pss := &PieceSeedStream{
sc: sc,
ctx: ctx,
hashKey: hashKey,
sr: sr,
opts: opts,
RetryMeta: rpc.RetryMeta{
MaxAttempts: 3,
InitBackoff: 0.2,
MaxBackOff: 2.0,
},
}
if err := pss.initStream(); err != nil {
return nil, err
}
return pss, nil
}
func (pss *PieceSeedStream) initStream() error {
var target string
stream, err := rpc.ExecuteWithRetry(func() (interface{}, error) {
var client cdnsystem.SeederClient
var err error
client, target, err = pss.sc.getCdnClient(pss.hashKey, false)
if err != nil {
return nil, err
}
return client.ObtainSeeds(pss.ctx, pss.sr, pss.opts...)
}, pss.InitBackoff, pss.MaxBackOff, pss.MaxAttempts, nil)
if err != nil {
if errors.Cause(err) == dferrors.ErrNoCandidateNode {
return errors.Wrapf(err, "get grpc server instance failed")
}
logger.WithTaskID(pss.hashKey).Errorf("initStream: invoke cdn node %s ObtainSeeds failed: %v", target, err)
return pss.replaceClient(pss.hashKey, err)
}
pss.stream = stream.(cdnsystem.Seeder_ObtainSeedsClient)
pss.StreamTimes = 1
return nil
}
func (pss *PieceSeedStream) Recv() (ps *cdnsystem.PieceSeed, err error) {
pss.sc.UpdateAccessNodeMapByHashKey(pss.hashKey)
return pss.stream.Recv()
}
func (pss *PieceSeedStream) retryRecv(cause error) (*cdnsystem.PieceSeed, error) {
if status.Code(cause) == codes.DeadlineExceeded || status.Code(cause) == codes.Canceled {
return nil, cause
}
if err := pss.replaceStream(cause); err != nil {
return nil, err
}
return pss.Recv()
}
func (pss *PieceSeedStream) replaceStream(cause error) error {
if pss.StreamTimes >= pss.MaxAttempts {
logger.WithTaskID(pss.hashKey).Info("replace stream reach max attempt")
return cause
}
var target string
stream, err := rpc.ExecuteWithRetry(func() (interface{}, error) {
var client cdnsystem.SeederClient
var err error
client, target, err = pss.sc.getCdnClient(pss.hashKey, true)
if err != nil {
return nil, err
}
return client.ObtainSeeds(pss.ctx, pss.sr, pss.opts...)
}, pss.InitBackoff, pss.MaxBackOff, pss.MaxAttempts, cause)
if err != nil {
logger.WithTaskID(pss.hashKey).Infof("replaceStream: invoke cdn node %s ObtainSeeds failed: %v", target, err)
return pss.replaceStream(cause)
}
pss.stream = stream.(cdnsystem.Seeder_ObtainSeedsClient)
pss.StreamTimes++
return nil
}
func (pss *PieceSeedStream) replaceClient(key string, cause error) error {
preNode, err := pss.sc.TryMigrate(key, cause, pss.failedServers)
if err != nil {
logger.WithTaskID(pss.hashKey).Infof("replaceClient: tryMigrate cdn node failed: %v", err)
return cause
}
pss.failedServers = append(pss.failedServers, preNode)
var target string
stream, err := rpc.ExecuteWithRetry(func() (interface{}, error) {
var client cdnsystem.SeederClient
var err error
client, target, err = pss.sc.getCdnClient(key, true)
if err != nil {
return nil, err
}
return client.ObtainSeeds(pss.ctx, pss.sr, pss.opts...)
}, pss.InitBackoff, pss.MaxBackOff, pss.MaxAttempts, cause)
if err != nil {
logger.WithTaskID(pss.hashKey).Infof("replaceClient: invoke cdn node %s ObtainSeeds failed: %v", target, err)
return pss.replaceClient(key, cause)
}
pss.stream = stream.(cdnsystem.Seeder_ObtainSeedsClient)
pss.StreamTimes = 1
return nil
}