/
handler.go
183 lines (168 loc) · 5.69 KB
/
handler.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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/**********************************************************\
| |
| hprose |
| |
| Official WebSite: http://www.hprose.com/ |
| http://www.hprose.org/ |
| |
\**********************************************************/
/**********************************************************\
* *
* rpc/handler.go *
* *
* hprose handler manager for Go. *
* *
* LastModified: May 22, 2017 *
* Author: Ma Bingyao <andot@hprose.com> *
* *
\**********************************************************/
package rpc
import "reflect"
// NextInvokeHandler is the next invoke handler function
type NextInvokeHandler func(
name string,
args []reflect.Value,
context Context) (results []reflect.Value, err error)
// InvokeHandler is the invoke handler function
type InvokeHandler func(
name string,
args []reflect.Value,
context Context,
next NextInvokeHandler) (results []reflect.Value, err error)
// NextFilterHandler is the next filter handler function
type NextFilterHandler func(
request []byte,
context Context) (response []byte, err error)
// FilterHandler is the filter handler function
type FilterHandler func(
request []byte,
context Context,
next NextFilterHandler) (response []byte, err error)
type addFilterHandler struct {
Use func(handler ...FilterHandler)
}
// handlerManager is the hprose handler manager
type handlerManager struct {
BeforeFilter addFilterHandler
AfterFilter addFilterHandler
invokeHandlers []InvokeHandler
beforeFilterHandlers []FilterHandler
afterFilterHandlers []FilterHandler
defaultInvokeHandler NextInvokeHandler
defaultBeforeFilterHandler NextFilterHandler
defaultAfterFilterHandler NextFilterHandler
invokeHandler NextInvokeHandler
beforeFilterHandler NextFilterHandler
afterFilterHandler NextFilterHandler
override struct {
invokeHandler NextInvokeHandler
beforeFilterHandler NextFilterHandler
afterFilterHandler NextFilterHandler
}
}
func (hm *handlerManager) initHandlerManager() {
hm.BeforeFilter.Use = hm.AddBeforeFilterHandler
hm.AfterFilter.Use = hm.AddAfterFilterHandler
hm.defaultInvokeHandler = func(
name string,
args []reflect.Value,
context Context) (results []reflect.Value, err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
return hm.override.invokeHandler(name, args, context)
}
hm.defaultBeforeFilterHandler = func(
request []byte,
context Context) (response []byte, err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
response, err = hm.override.beforeFilterHandler(request, context)
return
}
hm.defaultAfterFilterHandler = func(
request []byte,
context Context) (response []byte, err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
response, err = hm.override.afterFilterHandler(request, context)
return
}
hm.invokeHandler = hm.defaultInvokeHandler
hm.beforeFilterHandler = hm.defaultBeforeFilterHandler
hm.afterFilterHandler = hm.defaultAfterFilterHandler
}
func getNextInvokeHandler(
next NextInvokeHandler, handler InvokeHandler) NextInvokeHandler {
return func(name string,
args []reflect.Value,
context Context) (results []reflect.Value, err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
results, err = handler(name, args, context, next)
return
}
}
func getNextFilterHandler(
next NextFilterHandler, handler FilterHandler) NextFilterHandler {
return func(request []byte, context Context) (response []byte, err error) {
defer func() {
if e := recover(); e != nil {
err = NewPanicError(e)
}
}()
response, err = handler(request, context, next)
return
}
}
// AddInvokeHandler add the invoke handler
func (hm *handlerManager) AddInvokeHandler(handler ...InvokeHandler) {
if len(handler) == 0 {
return
}
hm.invokeHandlers = append(hm.invokeHandlers, handler...)
next := hm.defaultInvokeHandler
for i := len(hm.invokeHandlers) - 1; i >= 0; i-- {
next = getNextInvokeHandler(next, hm.invokeHandlers[i])
}
hm.invokeHandler = next
}
// AddBeforeFilterHandler add the filter handler before filters
func (hm *handlerManager) AddBeforeFilterHandler(handler ...FilterHandler) {
if len(handler) == 0 {
return
}
hm.beforeFilterHandlers = append(hm.beforeFilterHandlers, handler...)
next := hm.defaultBeforeFilterHandler
for i := len(hm.beforeFilterHandlers) - 1; i >= 0; i-- {
next = getNextFilterHandler(next, hm.beforeFilterHandlers[i])
}
hm.beforeFilterHandler = next
}
// AddAfterFilterHandler add the filter handler after filters
func (hm *handlerManager) AddAfterFilterHandler(handler ...FilterHandler) {
if len(handler) == 0 {
return
}
hm.afterFilterHandlers = append(hm.afterFilterHandlers, handler...)
next := hm.defaultAfterFilterHandler
for i := len(hm.afterFilterHandlers) - 1; i >= 0; i-- {
next = getNextFilterHandler(next, hm.afterFilterHandlers[i])
}
hm.afterFilterHandler = next
}
// Use is a method alias of AddInvokeHandler
func (hm *handlerManager) Use(handler ...InvokeHandler) {
hm.AddInvokeHandler(handler...)
}