Moduled Firegex, Merging pt1 (not finished and not working yet)

backend/modules/regexproxy/proxy.py

@@ -0,0 +1,116 @@
+import re, os, asyncio
+
+class Filter:
+    def __init__(self, regex, is_case_sensitive=True, is_blacklist=True, c_to_s=False, s_to_c=False, blocked_packets=0, code=None):
+        self.regex = regex
+        self.is_case_sensitive = is_case_sensitive
+        self.is_blacklist = is_blacklist
+        if c_to_s == s_to_c: c_to_s = s_to_c = True # (False, False) == (True, True)
+        self.c_to_s = c_to_s
+        self.s_to_c = s_to_c
+        self.blocked = blocked_packets
+        self.code = code
+    
+    def compile(self):
+        if isinstance(self.regex, str): self.regex = self.regex.encode()
+        if not isinstance(self.regex, bytes): raise Exception("Invalid Regex Paramether")
+        re.compile(self.regex) # raise re.error if is invalid!
+        case_sensitive = "1" if self.is_case_sensitive else "0"
+        if self.c_to_s:
+            yield case_sensitive + "C" + self.regex.hex() if self.is_blacklist else case_sensitive + "c"+ self.regex.hex()
+        if self.s_to_c:
+            yield case_sensitive + "S" + self.regex.hex() if self.is_blacklist else case_sensitive + "s"+ self.regex.hex()
+
+class Proxy:
+    def __init__(self, internal_port=0, public_port=0, callback_blocked_update=None, filters=None, public_host="0.0.0.0", internal_host="127.0.0.1"):
+        self.filter_map = {}
+        self.filter_map_lock = asyncio.Lock()
+        self.update_config_lock = asyncio.Lock()
+        self.status_change = asyncio.Lock()
+        self.public_host = public_host
+        self.public_port = public_port
+        self.internal_host = internal_host
+        self.internal_port = internal_port
+        self.filters = set(filters) if filters else set([])
+        self.process = None
+        self.callback_blocked_update = callback_blocked_update
+    
+    async def start(self, in_pause=False):
+        await self.status_change.acquire()
+        if not self.isactive():
+            try:
+                self.filter_map = self.compile_filters()
+                filters_codes = self.get_filter_codes() if not in_pause else []
+                proxy_binary_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),"../proxy")
+
+                self.process = await asyncio.create_subprocess_exec(
+                    proxy_binary_path, str(self.public_host), str(self.public_port), str(self.internal_host), str(self.internal_port),
+                    stdout=asyncio.subprocess.PIPE, stdin=asyncio.subprocess.PIPE
+                )
+                await self.update_config(filters_codes)
+            finally:
+                self.status_change.release()
+            try:
+                while True:
+                    buff = await self.process.stdout.readuntil()
+                    stdout_line = buff.decode()
+                    if stdout_line.startswith("BLOCKED"):
+                        regex_id = stdout_line.split()[1]
+                        async with self.filter_map_lock:
+                            if regex_id in self.filter_map:
+                                self.filter_map[regex_id].blocked+=1
+                                if self.callback_blocked_update: self.callback_blocked_update(self.filter_map[regex_id])
+            except Exception:
+                return await self.process.wait()
+        else:
+            self.status_change.release()
+                 
+
+    async def stop(self):
+        async with self.status_change:
+            if self.isactive():
+                self.process.kill()
+                return False
+            return True
+
+    async def restart(self, in_pause=False):
+        status = await self.stop()
+        await self.start(in_pause=in_pause)
+        return status
+    
+    async def update_config(self, filters_codes):
+        async with self.update_config_lock:
+            if (self.isactive()):
+                self.process.stdin.write((" ".join(filters_codes)+"\n").encode())
+                await self.process.stdin.drain()
+
+    async def reload(self):
+        if self.isactive():
+            async with self.filter_map_lock:
+                self.filter_map = self.compile_filters()
+                filters_codes = self.get_filter_codes()
+                await self.update_config(filters_codes)
+    
+    def get_filter_codes(self):
+        filters_codes = list(self.filter_map.keys())
+        filters_codes.sort(key=lambda a: self.filter_map[a].blocked, reverse=True)
+        return filters_codes
+
+    def isactive(self):
+        return self.process and self.process.returncode is None
+
+    async def pause(self):
+        if self.isactive():
+            await self.update_config([])
+        else:
+            await self.start(in_pause=True)
+
+    def compile_filters(self):
+        res = {}
+        for filter_obj in self.filters:
+            try:
+                raw_filters = filter_obj.compile()
+                for filter in raw_filters:
+                    res[filter] = filter_obj
+            except Exception: pass
+        return res