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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
package daemon
import (
"errors"
"net"
"sync"
"src.elv.sh/pkg/daemon/daemondefs"
"src.elv.sh/pkg/daemon/internal/api"
"src.elv.sh/pkg/rpc"
"src.elv.sh/pkg/store/storedefs"
)
const retriesOnShutdown = 3
var (
// ErrDaemonUnreachable is returned when the daemon cannot be reached after
// several retries.
ErrDaemonUnreachable = errors.New("daemon offline")
)
// Implementation of the Client interface.
type client struct {
sockPath string
rpcClient *rpc.Client
waits sync.WaitGroup
}
// NewClient creates a new Client instance that talks to the socket. Connection
// creation is deferred to the first request.
func NewClient(sockPath string) daemondefs.Client {
return &client{sockPath, nil, sync.WaitGroup{}}
}
// SockPath returns the socket path that the Client talks to. If the client is
// nil, it returns an empty string.
func (c *client) SockPath() string {
return c.sockPath
}
// ResetConn resets the current connection. A new connection will be established
// the next time a request is made. If the client is nil, it does nothing.
func (c *client) ResetConn() error {
if c.rpcClient == nil {
return nil
}
rc := c.rpcClient
c.rpcClient = nil
return rc.Close()
}
// Close waits for all outstanding requests to finish and close the connection.
// If the client is nil, it does nothing and returns nil.
func (c *client) Close() error {
c.waits.Wait()
return c.ResetConn()
}
func (c *client) call(f string, req, res any) error {
c.waits.Add(1)
defer c.waits.Done()
for attempt := 0; attempt < retriesOnShutdown; attempt++ {
if c.rpcClient == nil {
conn, err := net.Dial("unix", c.sockPath)
if err != nil {
return err
}
c.rpcClient = rpc.NewClient(conn)
}
err := c.rpcClient.Call(api.ServiceName+"."+f, req, res)
if err == rpc.ErrShutdown {
// Clear rpcClient so as to reconnect next time
c.rpcClient = nil
continue
} else {
return err
}
}
return ErrDaemonUnreachable
}
// Convenience methods for RPC methods. These are quite repetitive; when the
// number of RPC calls grow above some threshold, a code generator should be
// written to generate them.
func (c *client) Version() (int, error) {
req := &api.VersionRequest{}
res := &api.VersionResponse{}
err := c.call("Version", req, res)
return res.Version, err
}
func (c *client) Pid() (int, error) {
req := &api.PidRequest{}
res := &api.PidResponse{}
err := c.call("Pid", req, res)
return res.Pid, err
}
func (c *client) NextCmdSeq() (int, error) {
req := &api.NextCmdRequest{}
res := &api.NextCmdSeqResponse{}
err := c.call("NextCmdSeq", req, res)
return res.Seq, err
}
func (c *client) AddCmd(text string) (int, error) {
req := &api.AddCmdRequest{Text: text}
res := &api.AddCmdResponse{}
err := c.call("AddCmd", req, res)
return res.Seq, err
}
func (c *client) DelCmd(seq int) error {
req := &api.DelCmdRequest{Seq: seq}
res := &api.DelCmdResponse{}
err := c.call("DelCmd", req, res)
return err
}
func (c *client) Cmd(seq int) (string, error) {
req := &api.CmdRequest{Seq: seq}
res := &api.CmdResponse{}
err := c.call("Cmd", req, res)
return res.Text, err
}
func (c *client) CmdsWithSeq(from, upto int) ([]storedefs.Cmd, error) {
req := &api.CmdsWithSeqRequest{From: from, Upto: upto}
res := &api.CmdsWithSeqResponse{}
err := c.call("CmdsWithSeq", req, res)
return res.Cmds, err
}
func (c *client) NextCmd(from int, prefix string) (storedefs.Cmd, error) {
req := &api.NextCmdRequest{From: from, Prefix: prefix}
res := &api.NextCmdResponse{}
err := c.call("NextCmd", req, res)
return storedefs.Cmd{Text: res.Text, Seq: res.Seq}, err
}
func (c *client) PrevCmd(upto int, prefix string) (storedefs.Cmd, error) {
req := &api.PrevCmdRequest{Upto: upto, Prefix: prefix}
res := &api.PrevCmdResponse{}
err := c.call("PrevCmd", req, res)
return storedefs.Cmd{Text: res.Text, Seq: res.Seq}, err
}
func (c *client) AddDir(dir string, incFactor float64) error {
req := &api.AddDirRequest{Dir: dir, IncFactor: incFactor}
res := &api.AddDirResponse{}
err := c.call("AddDir", req, res)
return err
}
func (c *client) DelDir(dir string) error {
req := &api.DelDirRequest{Dir: dir}
res := &api.DelDirResponse{}
err := c.call("DelDir", req, res)
return err
}
func (c *client) Dirs(blacklist map[string]struct{}) ([]storedefs.Dir, error) {
req := &api.DirsRequest{Blacklist: blacklist}
res := &api.DirsResponse{}
err := c.call("Dirs", req, res)
return res.Dirs, err
}
|
