other

Author: furas

sockets/basic/README.md renamed to socket/basic/README.md

@@ -0,0 +1,72 @@
+#!/usr/bin/env python3
+
+#
+# https://docs.python.org/3.5/library/socket.html
+#
+ 
+import socket
+import time
+
+# --- constants ---
+
+HOST = ''    # (local or external) address IP of remote server
+PORT = 8000  # (local or external) port of remote server
+
+# server can have local address IP - used only in local network
+# or external address IP - used in internet on external router
+# (and router redirects data to internal address IP)
+
+# --- create socket ---
+
+print('[DEBUG] create socket')
+
+#s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s = socket.socket() # default value is (socket.AF_INET, socket.SOCK_STREAM)
+                    # so you don't have to use it in socket()
+
+# --- connect to server --- 
+
+print('[DEBUG] connect:', HOST, PORT)
+
+s.connect((HOST, PORT)) # one tuple (HOST, PORT), not two arguments
+
+# --- sending receivng many times ---
+
+try:
+    while True:
+
+        now = int(time.time())
+
+        # --- send data ---
+
+        # if you don't use native characters
+        # then you can use 'ascii' instead of 'utf-8'
+
+        text = "Hello World of Sockets in Python"
+        data = text.encode('utf-8') # encode string to bytes
+        s.send(data)     
+
+        print('[{}] send: {}'.format(now, text))
+
+        # --- receive data ---
+
+        # if you don't use native characters
+        # then you can use 'ascii' instead of 'utf-8'
+
+        data = s.recv(1024)
+        text = data.decode('utf-8') # decode bytes to string
+
+        print('[{}] recv: {}'.format(now, text))
+
+        # --- wait awhile ---
+        
+        time.sleep(1)
+
+except Exception as e:
+    print('[DEBUG] exception:', e)
+
+# --- close socket ---
+ 
+print('[DEBUG] close socket')
+
+s.close()

sockets/basic/version-1/client.py renamed to socket/basic/version-1/client.py

@@ -0,0 +1,111 @@
+#!/usr/bin/env python3
+
+#
+# https://docs.python.org/3.5/library/socket.html
+#
+ 
+import socket
+import threading
+import time
+
+# --- constants ---
+ 
+HOST = ''   # local address IP (not external address IP)
+
+            # '0.0.0.0' or '' - conection on all NICs (Network Interface Card),
+            # '127.0.0.1' or 'localhost' - local conection only (can't connect from remote computer)
+            # 'local_IP' - connection only on one NIC which has this IP
+            
+PORT = 8000 # local port (not external port)
+
+
+# --- functions ---
+
+def handle_client(conn, addr):
+
+    try:
+        while True:
+            # --- receive/send data ---
+
+            # if client first `send()` and next `recv()`
+            # then server have to first `recv`() and next `send()`
+
+            # if both will `recv()` at the same time then all will hang
+            # because both will wait for data and nobody will `send()`
+
+            # if you don't use native characters
+            # then you can use 'ascii' instead of 'utf-8'
+
+            now = int(time.time())
+
+            # receiving
+            
+            data = conn.recv(1024)
+            text = data.decode('utf-8') # decode bytes to string
+
+            print('[{}][{}] recv: {}'.format(addr, now, text))
+
+            # sending
+            
+            text = 'Thank you [{}]'.format(now)
+            data = text.encode('utf-8') # encode string to bytes
+            conn.send(data)
+
+            print('[{}]][{}] send: {}'.format(addr, now, text))
+            
+    except Exception as e:
+        print('[DEBUG] exception:', e)
+    
+# --- create socket ---
+
+print('[DEBUG] create socket')
+
+#s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s = socket.socket() # default value is (socket.AF_INET, socket.SOCK_STREAM)
+                    # so you don't have to use it in socket()
+
+# --- options ---
+ 
+print('[DEBUG] set options')
+
+# solution for "[Error 89] Address already in use". Use before bind()
+s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+
+# --- assign socket to local IP (local NIC) ---
+
+print('[DEBUG] bind:', (HOST, PORT))
+
+s.bind((HOST, PORT)) # one tuple (HOST, PORT), not two arguments
+
+# --- set size of queue ---
+
+print('[DEBUG] listen')
+
+s.listen(1) # number of clients waiting in queue for "accept".
+            # If queue is full then client can't connect.
+ 
+while True:
+    # --- accept client ---
+     
+    # accept client and create new socket `conn` (with different port) for this client only
+    # and server will can use `s` to accept other clients (if you will use threading)
+        
+    print('[DEBUG] accept ... waiting')
+
+    conn, addr = s.accept()
+
+    print('[DEBUG] addr:', addr)
+
+    # --- run thread ---
+
+    t = threading.Thread(target=handle_client, args=(conn, addr))
+    t.start()
+    
+# --- close all sockets ---
+ 
+# alway first close `conn`, next close `s`
+
+print('[DEBUG] close socket(s)')
+
+conn.close()
+s.close()

sockets/basic/version-1/server.py renamed to socket/basic/version-1/server.py

@@ -1,31 +1,53 @@
 #!/usr/bin/env python3
 
-from threading import Thread
+#
+# https://docs.python.org/3/library/threading.html
+#
+
+import threading
 import time
 
-# -----
+# --- classes ---
+
+class ExampleThread(threading.Thread):
+
+    def __init__(self, name, counter=10, sleep=0.5):
+        threading.Thread.__init__(self)
+        self.name = name
+        self.counter = counter
+        self.sleep = sleep
+        
+    def run(self):
+        for x in range(self.counter):
+            print(self.name, x)
+            time.sleep(self.sleep)
+
+# --- functions ---
 
-def my_function(name, counter):
+def example_function(name, counter=10, sleep=0.5):
     for x in range(counter):
         print(name, x)
-        time.sleep(0.5)
+        time.sleep(sleep)
 
-# -----
 
-class MyThread(Thread):
-    
-    def run(self):
-        my_function("Hello", 10)
-        
-# -----
+# --- example 1 ---
+
+# `args` have to be tuple.
+# for one argument you need `args=("function:",)`
+
+t1 = threading.Thread(target=example_function, args=("function:", 15))
+t1.start()
+
+# --- example 2 ---
+
+t2 = ExampleThread("class:", 10, 1.0)
+t2.start()
 
-thread = MyThread()
-thread.start()
+# --- example 2 ---
 
-# -----
+# start thread after 3 seconds
 
-# args have to be tuple so for one argument `args=(10,)`
+t3 = threading.Timer(3, example_function, args=("** timer **:", 2, 3.0))
+t3.start()
 
-thread = Thread( target=my_function, args=("World", 10) )
-thread.start()
 

sockets/basic/version-2/client.py renamed to socket/basic/version-2/client.py

@@ -0,0 +1 @@
+

sockets/basic/version-2/server.py renamed to socket/basic/version-2/server.py

@@ -0,0 +1,37 @@
+from graphics import *
+
+# --- constants ---
+
+WIDTH = 300
+HEIGHT = 300
+
+# --- main ----
+
+win = GraphWin("EXAMPLE", WIDTH, HEIGHT)
+
+# ---
+
+RADIUS = 50
+
+bbox = (0, -RADIUS/2, RADIUS*2, RADIUS*2-RADIUS/2)
+win.create_arc(bbox, fill="blue", outline="blue", extent=120, style='chord', start=30+180)
+
+bbox = (0, RADIUS/2, RADIUS*2, RADIUS*2+RADIUS/2)
+win.create_arc(bbox, fill="blue", outline="blue", extent=120, style='chord', start=30)
+
+#bbox = (0, -75, RADIUS*2, RADIUS*2-75)
+#win.create_arc(bbox, fill="blue", outline="blue", extent=120, style='chord', start=30+180)
+
+#bbox = (0, 75, 300, 300+75)
+#win.create_arc(bbox,  fill="blue", outline="blue", extent=120, style='chord', start=30)
+
+# ---
+
+#win.create_oval((100, 100, 200, 200), fill="white", outline="white")
+#win.create_oval((130, 130, 170, 170), fill="black", outline="black")
+
+# ---
+#win.getKey()
+win.getMouse()
+
+win.close()

socket/basic/version-4/client.py

@@ -0,0 +1,33 @@
+from graphics import *
+
+# --- constants ---
+
+WIDTH = 300
+HEIGHT = 300
+
+# --- main ----
+
+win = GraphWin("EXAMPLE", WIDTH, HEIGHT)
+
+win.create_arc((0, -75, 300, 300-75), fill="blue", outline="blue", extent=120, style='chord', start=30+180)
+win.create_arc((0, 75, 300, 300+75),  fill="blue", outline="blue", extent=120, style='chord', start=30)
+
+# ---
+
+RADIUS = 75
+
+bbox = (0, -75, 300, 300-75)
+win.create_arc(bbox, fill="blue", outline="blue", extent=120, style='chord', start=30+180)
+bbox = (0, 75, 300, 300+75)
+win.create_arc(bbox,  fill="blue", outline="blue", extent=120, style='chord', start=30)
+
+# ---
+
+win.create_oval((100, 100, 200, 200), fill="white", outline="white")
+win.create_oval((130, 130, 170, 170), fill="black", outline="black")
+
+# ---
+#win.getKey()
+win.getMouse()
+
+win.close()

socket/basic/version-4/server.py

@@ -0,0 +1,46 @@
+from graphics import *
+
+# --- constants ---
+
+WIDTH = 300
+HEIGHT = 300
+
+# --- functions ---
+
+def moves():
+
+    # move figure 1    
+    s = win.itemcget(fig1, 'start')
+    win.itemconfig(fig1, start=float(s)+5)
+    
+    # move figure 2
+    s = win.itemcget(fig2, 'start')
+    win.itemconfig(fig2, start=float(s)+5)
+
+    # move figure 3
+    s = win.itemcget(fig3, 'start')
+    win.itemconfig(fig3, start=float(s)+5)
+
+    # run again after 100ms (0.1s)
+    win.after(100, moves)
+
+# --- main ----
+
+win = GraphWin("Patch", WIDTH, HEIGHT)
+
+bbox = (5, 5, WIDTH-5, HEIGHT-5)
+
+#fig1 = win.create_arc(bbox, fill="red", outline='green', width=3, start=0,   extent=90, style='arc')
+#fig2 = win.create_arc(bbox, fill="red", outline='green', width=3, start=95,  extent=90, style='chord')
+#fig3 = win.create_arc(bbox, fill="red", outline='green', width=3, start=190, extent=90, style='pieslice')
+
+win.create_arc((0, -75, 300, 225), fill="blue", outline="blue", extent=120, style='chord', start=30+180)
+win.create_arc((0, 75, 300, 375),  fill="blue", outline="blue", extent=120, style='chord', start=30)
+
+# run first time
+#moves()
+
+#win.getKey()
+win.getMouse()
+
+win.close()