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
|
package tntengine
import (
"context"
"fmt"
"time"
"github.com/FZambia/tarantool"
)
const (
defaultConnectTimeout = time.Second
defaultRequestTimeout = time.Second
defaultReadTimeout = 5 * time.Second
defaultWriteTimeout = time.Second
)
// Shard represents single Tarantool instance.
type Shard struct {
config ShardConfig
subCh chan subRequest
mc *MultiConnection
}
// ShardConfig allows providing options to connect to Tarantool.
type ShardConfig struct {
// Addresses of Tarantool instances.
Addresses []string
// User for auth.
User string
// Password for auth.
Password string
// ConnectionMode for shard.
ConnectionMode ConnectionMode
}
func NewShard(c ShardConfig) (*Shard, error) {
shard := &Shard{
config: c,
subCh: make(chan subRequest),
}
mc, err := Connect(c.Addresses, tarantool.Opts{
ConnectTimeout: defaultConnectTimeout,
RequestTimeout: defaultRequestTimeout,
ReadTimeout: defaultReadTimeout,
WriteTimeout: defaultWriteTimeout,
ReconnectDelay: 50 * time.Millisecond,
User: c.User,
Password: c.Password,
SkipSchema: true,
}, MultiOpts{
ConnectionMode: c.ConnectionMode,
})
if err != nil {
return nil, fmt.Errorf("error creating req connection to %#v: %w", c.Addresses, err)
}
shard.mc = mc
return shard, nil
}
func (s *Shard) Exec(request *tarantool.Request) (*tarantool.Response, error) {
conn, err := s.mc.LeaderConn()
if err != nil {
return nil, err
}
return conn.Exec(request)
}
func (s *Shard) ExecTyped(request *tarantool.Request, result interface{}) error {
conn, err := s.mc.LeaderConn()
if err != nil {
return err
}
return conn.ExecTyped(request, result)
}
func (s *Shard) pubSubConn() (*tarantool.Connection, func(), error) {
conn, err := s.mc.NewLeaderConn(tarantool.Opts{
ConnectTimeout: defaultConnectTimeout,
RequestTimeout: 5 * time.Second,
ReadTimeout: defaultReadTimeout,
WriteTimeout: defaultWriteTimeout,
ReconnectDelay: 0,
User: s.config.User,
Password: s.config.Password,
SkipSchema: true,
})
if err != nil {
return nil, nil, err
}
ctx, cancel := context.WithCancel(context.Background())
go func() {
for {
select {
case <-ctx.Done():
return
case <-time.After(time.Second):
ok, err := s.mc.IsLeader(conn)
if err != nil || !ok {
s.mc.LeaderChanged()
_ = conn.Close()
}
}
}
}()
return conn, cancel, nil
}
// subRequest is an internal request to subscribe or unsubscribe from one or more channels
type subRequest struct {
channels []string
subscribe bool
err chan error
}
// newSubRequest creates a new request to subscribe or unsubscribe form a channel.
func newSubRequest(chIDs []string, subscribe bool) subRequest {
return subRequest{
channels: chIDs,
subscribe: subscribe,
err: make(chan error, 1),
}
}
// done should only be called once for subRequest.
func (sr *subRequest) done(err error) {
sr.err <- err
}
func (sr *subRequest) result() error {
return <-sr.err
}
|
