Non-blocking socket in Python? -



Non-blocking socket in Python? -

is me, or can not find tutorial on non-blocking sockets in python?

i'm not sure how work .recv , .send in it. according python docs, (my understanding of it, @ least) recv'ed or send'ed info might partial data. mean have somehow concatenate info while recv , create sure info sends through in send. if so, how? illustration much appreciated.

it doesn't matter if socket in non-blocking mode or not, recv/send work pretty much same; difference non-blocking socket throws 'resource temporarily unavailable' error instead of waiting data/socket.

recv method returns numbers of bytes received, told less or equal passed bufsize. if want receive size bytes, should similar next code:

def recvall(sock, size): info = '' while len(data) < size: d = sock.recv(size - len(data)) if not d: # connection closed remote host, best homecoming none info += d homecoming info

this of import remember, in blocking mode have same. (the number of bytes passed application layer illustration limited recv buffer size in os.)

send method returns number of bytes sent, told less or equal length of passed string. if want ensure whole message sent, should similar next code:

def sendall(sock, data): while data: sent = sock.send(data) info = data[sent:]

you can utilize sock.sendall directly, (according documentation) on error, exception raised, , there no way determine how much data, if any, sent.

the sockets in python follow bsd socket api , behave in similar way c-style sockets (the difference is, example, throw exception instead of returning error code). should happy socket tutorial on web , manpages.

python sockets

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