# Example of reading from a socket using channels and writing back to it
# directly. Running this file and navigating to <address of server>:8080
# should result in your browser displaying "SUCCESS!".
#
# Unfortunately, the reading implementation has some redundant, inelegant
# code to make up for my lack of insight into Linux's socket internals.
def main [
local-scope
socket:num <- $socket 8080/port
$print [Mu socket creation returned ], socket, 10/newline
return-unless socket
session:num <- $accept socket
contents:&:source:char, sink:&:sink:char <- new-channel 30
sink <- start-running transmit-from-socket session, sink
buf:&:buffer <- new-buffer 30
{
c:char, done?:bool, contents <- read contents
break-if done?
buf <- append buf, c
loop
}
socket-text:text <- buffer-to-array buf
$print [Done reading from socket.], 10/newline
write-to-socket session, [HTTP/1.0 200 OK
Content-type: text/plain
SUCCESS!
], contents
$print 10/newline, [Wrote to and closing socket...], 10/newline
$close-socket session
$close-socket socket
]
def write-to-socket session-socket:num, s:text, source:&:source:char [
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
$print [writing to socket: ], i, [ ], c, 10/newline
$write-to-socket session-socket, c
i <- add i, 1
loop
}
]
def transmit-from-socket session:num, sink:&:sink:char -> sink:&:sink:char [
local-scope
load-ingredients
{
req:text, bytes-read:num <- $read-from-socket session, 4096/bytes
$print [read ], bytes-read, [ bytes from socket], 10/newline
i:num <- copy 0
{
done?:bool <- greater-or-equal i, bytes-read
break-if done?
c:char <- index *req, i
end-of-request?:bool <- equal c, 10/newline
break-if end-of-request? # To be safe, for now.
sink <- write sink, c
i <- add i, 1
loop
}
}
sink <- close sink
]