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
|
package jsonrpc2
import (
"encoding/json"
"sync"
)
// Logger interface implements one method - Printf.
// You can use the stdlib logger *log.Logger
type Logger interface {
Printf(format string, v ...interface{})
}
// ConnOpt is the type of function that can be passed to NewConn to
// customize the Conn before it is created.
type ConnOpt func(*Conn)
// OnRecv causes all requests received on conn to invoke f(req, nil)
// and all responses to invoke f(req, resp),
func OnRecv(f func(*Request, *Response)) ConnOpt {
return func(c *Conn) { c.onRecv = append(c.onRecv, f) }
}
// OnSend causes all requests sent on conn to invoke f(req, nil) and
// all responses to invoke f(nil, resp),
func OnSend(f func(*Request, *Response)) ConnOpt {
return func(c *Conn) { c.onSend = append(c.onSend, f) }
}
// LogMessages causes all messages sent and received on conn to be
// logged using the provided logger.
func LogMessages(logger Logger) ConnOpt {
return func(c *Conn) {
// Remember reqs we have received so we can helpfully show the
// request method in OnSend for responses.
var (
mu sync.Mutex
reqMethods = map[ID]string{}
)
// Set custom logger from provided input
c.logger = logger
OnRecv(func(req *Request, resp *Response) {
switch {
case req != nil:
mu.Lock()
reqMethods[req.ID] = req.Method
mu.Unlock()
params, _ := json.Marshal(req.Params)
if req.Notif {
logger.Printf("jsonrpc2: --> notif: %s: %s\n", req.Method, params)
} else {
logger.Printf("jsonrpc2: --> request #%s: %s: %s\n", req.ID, req.Method, params)
}
case resp != nil:
var method string
if req != nil {
method = req.Method
} else {
method = "(no matching request)"
}
switch {
case resp.Result != nil:
result, _ := json.Marshal(resp.Result)
logger.Printf("jsonrpc2: --> result #%s: %s: %s\n", resp.ID, method, result)
case resp.Error != nil:
err, _ := json.Marshal(resp.Error)
logger.Printf("jsonrpc2: --> error #%s: %s: %s\n", resp.ID, method, err)
}
}
})(c)
OnSend(func(req *Request, resp *Response) {
switch {
case req != nil:
params, _ := json.Marshal(req.Params)
if req.Notif {
logger.Printf("jsonrpc2: <-- notif: %s: %s\n", req.Method, params)
} else {
logger.Printf("jsonrpc2: <-- request #%s: %s: %s\n", req.ID, req.Method, params)
}
case resp != nil:
mu.Lock()
method := reqMethods[resp.ID]
delete(reqMethods, resp.ID)
mu.Unlock()
if method == "" {
method = "(no previous request)"
}
if resp.Result != nil {
result, _ := json.Marshal(resp.Result)
logger.Printf("jsonrpc2: <-- result #%s: %s: %s\n", resp.ID, method, result)
} else {
err, _ := json.Marshal(resp.Error)
logger.Printf("jsonrpc2: <-- error #%s: %s: %s\n", resp.ID, method, err)
}
}
})(c)
}
}
// SetLogger sets the logger for the connection.
func SetLogger(logger Logger) ConnOpt {
return func(c *Conn) {
c.logger = logger
}
}
|
