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Edit File : nonblocking.py \| Size : 2.37 KB
# # # import select import fcntl import os class NonBlockingFile: def __init__(self, fd): # Keep a copy of the file descriptor self.fd = fd fcntl.fcntl(self.fd.fileno(), fcntl.F_SETFL, os.O_NDELAY) # Set the callback-related stuff self.read_fd_set = [] self.write_fd_set = [] self.exc_fd_set = [] self.user_data = None self.callback = None def set_callback(self, read_fd_set, write_fd_set, exc_fd_set, user_data, callback): self.read_fd_set = read_fd_set # Make the objects non-blocking for f in self.read_fd_set: fcntl.fcntl(f.fileno(), fcntl.F_SETFL, os.O_NDELAY) self.write_fd_set = write_fd_set self.exc_fd_set = exc_fd_set self.user_data = user_data self.callback = callback def read(self, amt=0): while 1: status_changed = 0 readfds = self.read_fd_set + [self.fd] writefds = self.write_fd_set excfds = self.exc_fd_set print("Calling select", readfds) readfds, writefds, excfds = select.select(readfds, writefds, excfds) print("Select returned", readfds, writefds, excfds) if self.fd in readfds: # Our own file descriptor has changed status # Mark this, but also try to call the callback with the rest # of the file descriptors that changed status status_changed = 1 readfds.remove(self.fd) if self.callback and (readfds or writefds or excfds): self.callback(readfds, writefds, excfds, self.user_data) if status_changed: break print("Returning") return self.fd.read(amt) def write(self, data): return self.fd.write(data) def __getattr__(self, name): return getattr(self.fd, name) def callback(r, w, e, user_data): print("Callback called", r, w, e) print(r[0].read()) if __name__ == '__main__': import socket s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("localhost", 5555)) f = s.makefile() ss = NonBlockingFile(f) s2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s2.connect(("localhost", 5556)) f = s2.makefile() ss.set_callback([f], [], [], None, callback) xx = ss.read() print(len(xx)) Back

Edit File : nonblocking.py | Size : 2.37 KB

#
#
#

import select
import fcntl
import os

class NonBlockingFile:
    def __init__(self, fd):
        # Keep a copy of the file descriptor
        self.fd = fd
        fcntl.fcntl(self.fd.fileno(), fcntl.F_SETFL, os.O_NDELAY)
        # Set the callback-related stuff
        self.read_fd_set = []
        self.write_fd_set = []
        self.exc_fd_set = []
        self.user_data = None
        self.callback = None

def set_callback(self, read_fd_set, write_fd_set, exc_fd_set,
            user_data, callback):
        self.read_fd_set = read_fd_set
        # Make the objects non-blocking
        for f in self.read_fd_set:
            fcntl.fcntl(f.fileno(), fcntl.F_SETFL, os.O_NDELAY)

self.write_fd_set = write_fd_set
        self.exc_fd_set = exc_fd_set
        self.user_data = user_data
        self.callback = callback

def read(self, amt=0):
        while 1:
            status_changed = 0
            readfds = self.read_fd_set + [self.fd]
            writefds = self.write_fd_set
            excfds = self.exc_fd_set
            print("Calling select", readfds)
            readfds, writefds, excfds = select.select(readfds, writefds, excfds)
            print("Select returned", readfds, writefds, excfds)
            if self.fd in readfds:
                # Our own file descriptor has changed status
                # Mark this, but also try to call the callback with the rest
                # of the file descriptors that changed status
                status_changed = 1
                readfds.remove(self.fd)
            if self.callback and (readfds or writefds or excfds):
                self.callback(readfds, writefds, excfds, self.user_data)
            if status_changed:
                break
        print("Returning")
        return self.fd.read(amt)

def write(self, data):
        return self.fd.write(data)

def __getattr__(self, name):
        return getattr(self.fd, name)

def callback(r, w, e, user_data):
    print("Callback called", r, w, e)
    print(r[0].read())

if __name__ == '__main__':
    import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect(("localhost", 5555))
    f = s.makefile()
    ss = NonBlockingFile(f)

s2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s2.connect(("localhost", 5556))
    f = s2.makefile()
    ss.set_callback([f], [], [], None, callback)

xx = ss.read()
    print(len(xx))

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