Python socket recv (client-side) - php

Question

i have to connect to an api via socket and send / recv some data.
the company send me a php-example-file with this code for reading data from the socket:
function readAnswer() {
$size = fgets($this->socketPtr, 64);
$answer = "";
$readed = 0;
while($readed < $size) {
$part = fread($this->socketPtr, $size - $readed);
$readed += strlen($part);
$answer .= $part;
}
return $answer;
}
This works for me. But in python i get from times to times an error.
not everything from the socket is recv.
my python try looks like this:
def read_answer(self,the_socket,timeout=0.5):
the_socket.setblocking(0)
total_data=[]
data=''
begin=time.time()
while 1:
if total_data and time.time()-begin > timeout:
break
elif time.time()-begin > timeout*2:
break
try:
data = the_socket.recv(8192)
if data:
total_data.append(data)
begin=time.time()
else:
time.sleep(0.1)
except:
pass
return ''.join(total_data)
i recv data as a dict / array. and from time to time i only get a int (msg length i think)
so what would be a better way to read the data from socket.
ah the api sends the data in a correct way, i checked this. it's only this little function ;(
After using the code below (thanks falsetru) and added a readed=len(data) i run into another problem:
this is the working php code:
function _parse_answer($answerData)
{
$result = array();
$lines = explode("\n", $answerData);
$data = explode("&", $lines[0]);
foreach($data as $piece)
{
$keyval = explode("=", $piece, 2);
$result[$keyval[0]] = $keyval[1];
}
for($i=1;$i<count($lines);$i++)
{
$result["csv"][]=$lines[$i];
}
return $result;
}
and this my crappy python code:
def parse_answer(self,data):
#print "dd_demo_api: answer: (%s)" % (data)
if data:
result = {}
lines = data.split("\n")
index_list = 0
if len(lines) == 1:
index_list = 0
else:
index_list = 1
pieces = lines[index_list].split("&")
for x in pieces:
keyval = x.split("=")
result[keyval[0]] = keyval[1]
iterlines = iter(lines)
next(iterlines)
next(iterlines)
count = 1
result["csv"] = {}
for x in iterlines:
result["csv"][count] = x.split(";")
return result
else:
return 0
i think here is some optimization required? ;(

Answer 1

Python version does not do the same thing with PHP version.
Try following code:
def read_answer(self, sock):
size = int(sock.recv(64).strip().rstrip('\0'))
# Above is not exactly same as `fgets`.
# If that causes an issue, use following instead.
#
# f = sock.makefile('r')
# size = int(f.readline(64).rstrip('\0'))
#
# and replace `sock.recv(n)` with `f.read(n)` in the following loop.
total_data = []
readed = 0
while readed < size:
data = sock.recv(size - readed)
if data:
total_data.append(data)
readed += len(data)
return b''.join(total_data)