Demonstrate multiprocess execution

parse.py

@@ -2,6 +2,14 @@ import ply.lex as lex
 import ply.yacc as yacc
 import enum
 import uuid
+import os
+import logging
+from multiprocessing import Process
+from multiprocessing import Value 
+from multiprocessing import Pipe
+
+logg = logging.getLogger()
+logg.setLevel(logging.DEBUG)
 
 tokens = (
     'ID',
@@ -236,14 +244,73 @@ def p_pairnoid(p):
     p[0] = o
 
 
+class Router:
+
+    def __init__(self):
+        self.__routes = {}
+        self.__r = {}
+
+
+    def register(self, cmd_id, fn):
+        self.__routes[cmd_id] = fn
+
+
+    def sync(self, uid):
+        o = self.__r[uid]
+        if o[1] == None:
+            return None
+        r = o[1][0].recv()
+        o = (o[0], None,)
+        o[0].join()
+        return r
+
+
+    def __wrap(self, uid, fn, cmd):
+        r = fn(cmd)
+        self.__r[uid][1][1].send(r)
+
+
+    def exec(self, cmd):
+        if cmd.c & 0xa0 > 0:
+            return self.sync(cmd.i)
+        fn = self.__routes[cmd.c]
+        pi = Pipe(False)
+        po = Process(target=self.__wrap, args=(cmd.i, fn, cmd,))
+        self.__r[cmd.i] = (po, pi,)
+        po.start()
+
+
+    def __del__(self):
+        for k, v in self.__r.items():
+            r = self.sync(k)
+            logging.debug("synced " + k + ": " + r)
+
+
+def noop_handler(cmd):
+    return str(cmd)
+
+
+def foo_handler(cmd):
+    return os.popen('eth-info -p https://celo.grassecon.net').read()
+
+
 parser = yacc.yacc()
 
-print("result: {}".format(parser.parse("WAIT bar-baz")))
-print("result: {}".format(parser.parse("KEY_CREATE bar-baz Foo BAr")))
-print("result: {}".format(parser.parse("KEY_CREATE bar-baz Foo BAr 0xabcdef0")))
-print("result: {}".format(parser.parse("VOUCHER_MINT - 0xdeadbeef 13 0xfdaf")))
-print("result: {}".format(parser.parse("VOUCHER_MINT bar-baz 0xdeadbeef 13 0xfdaf")))
-print("result: {}".format(parser.parse("VOUCHER_MINT bar-baz 0xdeadbeef 42")))
-print("result: {}".format(parser.parse("VOUCHER_CREATE bar-baz Foo Bar 42")))
-print("result: {}".format(parser.parse("VOUCHER_CREATE bar-baz Foo Bar 42 44 233")))
-print("result: {}".format(parser.parse("VOUCHER_TRANSFER bar-baz 0xbeeffeed0123 666 foo 0x0fdc")))
+cmds = [
+    "KEY_CREATE foo-bar Foo BAr",
+    "KEY_CREATE bar-baz Foo BAr 0xabcdef0",
+    "VOUCHER_MINT - 0xdeadbeef 13 0xfdaf",
+    "VOUCHER_MINT baz-baz 0xdeadbeef 13 0xfdaf",
+    "VOUCHER_MINT bar-bar 0xdeadbeef 42",
+    "VOUCHER_CREATE foo-foo Foo Bar 42",
+    "VOUCHER_CREATE inky-pinky-blinky Foo Bar 42 44 233",
+    "VOUCHER_TRANSFER clyde-sue 0xbeeffeed0123 666 foo 0x0fdc",
+        ]
+for v in cmds:
+    o = Router()
+    o.register(CmdId.KEY_CREATE, noop_handler)
+    o.register(CmdId.VOUCHER_MINT, noop_handler)
+    o.register(CmdId.VOUCHER_CREATE, noop_handler)
+    o.register(CmdId.VOUCHER_TRANSFER, foo_handler)
+    r = parser.parse(v)
+    o.exec(r)