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
|
# Wrappers around socket primitives that are easier to test.
# To test server operations, just run a real client against localhost.
scenario example-server-test [
local-scope
# test server without a fake on a random (real) port
# that way repeatedly running the test will give ports time to timeout and
# close before reusing them
make-random-nondeterministic
port:num <- random-in-range 0/real-random-numbers, 8000, 8100
run [
socket:num <- $open-server-socket port
assert socket, [
F - example-server-test: $open-server-socket failed]
handler-routine:number <- start-running serve-one-request socket, example-handler
]
source:&:source:char <- start-reading-from-network 0/real-resources, [localhost/], port
response:text <- drain source
10:@:char/raw <- copy *response
memory-should-contain [
10:array:character <- [abc]
]
socket <- $close-socket socket
]
# helper just for this scenario
def example-handler query:text -> response:text [
local-scope
load-ingredients
return [abc]
]
# To test client operations, use `assume-resources` with a filename that
# begins with a hostname. (Filenames starting with '/' are assumed to be
# local.)
scenario example-client-test [
local-scope
assume-resources [
[example.com/] <- [
|abc|
]
]
run [
source:&:source:char <- start-reading-from-network resources, [example.com/]
]
contents:text <- drain source
10:@:char/raw <- copy *contents
memory-should-contain [
10:array:character <- [abc
]
]
]
type request-handler = (recipe text -> text)
def serve-one-request socket:num, request-handler:request-handler -> socket:num [
local-scope
load-ingredients
session:num <- $accept socket
assert session, [
F - example-server-test: $accept failed]
contents:&:source:char, sink:&:sink:char <- new-channel 30
start-running receive-from-socket session, sink
query:text <- drain contents
response:text <- call request-handler, query
write-to-socket session, response
session <- $close-socket session
]
def start-reading-from-network resources:&:resources, uri:text -> contents:&:source:char [
local-scope
load-ingredients
{
port:num, port-found?:boolean <- next-ingredient
break-if port-found?
port <- copy 80/http-port
}
{
break-unless resources
# fake network
contents <- start-reading-from-fake-resource resources, uri
return
}
# real network
host:text, path:text <- split-at uri, 47/slash
socket:num <- $open-client-socket host, port
assert socket, [contents]
req:text <- interpolate [GET _ HTTP/1.1], path
request-socket socket, req
contents:&:source:char, sink:&:sink:char <- new-channel 10000
start-running receive-from-client-socket-and-close socket, sink
]
def request-socket socket:num, s:text -> socket:num [
local-scope
load-ingredients
write-to-socket socket, s
$write-to-socket socket, 13/cr
$write-to-socket socket, 10/lf
# empty line to delimit request
$write-to-socket socket, 13/cr
$write-to-socket socket, 10/lf
]
def receive-from-socket socket:num, sink:&:sink:char -> sink:&:sink:char, socket:num [
local-scope
load-ingredients
{
+next-attempt
c:char, found?:bool, eof?:bool, error:num <- $read-from-socket socket
break-if eof?
break-if error
{
break-unless found?
sink <- write sink, c
}
{
break-if found?
switch
}
loop
}
sink <- close sink
]
def receive-from-client-socket-and-close socket:num, sink:&:sink:char -> sink:&:sink:char, socket:num [
local-scope
load-ingredients
sink <- receive-from-socket socket, sink
socket <- $close-socket socket
]
def write-to-socket socket:num, s:text [
local-scope
load-ingredients
len:num <- length *s
i:num <- copy 0
{
done?:bool <- greater-or-equal i, len
break-if done?
c:char <- index *s, i
$write-to-socket socket, c
i <- add i, 1
loop
}
]
# like split-first, but don't eat the delimiter
def split-at text:text, delim:char -> x:text, y:text [
local-scope
load-ingredients
# empty text? return empty texts
len:num <- length *text
{
empty?:bool <- equal len, 0
break-unless empty?
x:text <- new []
y:text <- new []
return
}
idx:num <- find-next text, delim, 0
x:text <- copy-range text, 0, idx
y:text <- copy-range text, idx, len
]
scenario text-split-at [
local-scope
x:text <- new [a/b]
run [
y:text, z:text <- split-at x, 47/slash
10:@:char/raw <- copy *y
20:@:char/raw <- copy *z
]
memory-should-contain [
10:array:character <- [a]
20:array:character <- [/b]
]
]
|