abstract protocol selection in `common`

[loctrkd.git] / loctrkd / common.py

diff --git a/loctrkd/common.py b/loctrkd/common.py
index 227611c62fa4b8cf04f6bb22f2f8e4754cd744f2..02b520f620d7d82582df949361b572327de283ac 100644 (file)
--- a/loctrkd/common.py
+++ b/loctrkd/common.py
@@ -1,16 +1,18 @@
 """ Common housekeeping for all daemons """
 
-from configparser import ConfigParser, SectionProxy
+from configparser import ConfigParser
+from importlib import import_module
 from getopt import getopt
 from logging import Formatter, getLogger, Logger, StreamHandler, DEBUG, INFO
 from logging.handlers import SysLogHandler
 from pkg_resources import get_distribution, DistributionNotFound
 from sys import argv, stderr, stdout
-from typing import Any, Dict, List, Optional, Tuple, Union
+from typing import Any, cast, Dict, List, Optional, Tuple, Union
+
+from .protomodule import ProtoModule
 
 CONF = "/etc/loctrkd.conf"
-PORT = 4303
-DBFN = "/var/lib/loctrkd/loctrkd.sqlite"
+pmods: List[ProtoModule] = []
 
 try:
     version = get_distribution("loctrkd").version
@@ -18,13 +20,22 @@ except DistributionNotFound:
     version = "<local>"
 
 
+def init_protocols(conf: ConfigParser) -> None:
+    global pmods
+    pmods = [
+        cast(ProtoModule, import_module("." + modnm, __package__))
+        for modnm in conf.get("common", "protocols").split(",")
+    ]
+
+
 def init(
     log: Logger, opts: Optional[List[Tuple[str, str]]] = None
 ) -> ConfigParser:
     if opts is None:
         opts, _ = getopt(argv[1:], "c:d")
     dopts = dict(opts)
-    conf = readconfig(dopts["-c"] if "-c" in dopts else CONF)
+    conf = ConfigParser()
+    conf.read(dopts["-c"] if "-c" in dopts else CONF)
     log.setLevel(DEBUG if "-d" in dopts else INFO)
     if stdout.isatty():
         fhdl = StreamHandler(stderr)
@@ -40,59 +51,19 @@ def init(
         )
         log.addHandler(lhdl)
         log.info("%s starting with options: %s", version, dopts)
+    init_protocols(conf)
     return conf
 
 
-def readconfig(fname: str) -> ConfigParser:
-    config = ConfigParser()
-    config["collector"] = {
-        "port": str(PORT),
-    }
-    config["storage"] = {
-        "dbfn": DBFN,
-    }
-    config["termconfig"] = {}
-    config.read(fname)
-    return config
-
-
-def normconf(section: SectionProxy) -> Dict[str, Any]:
-    result: Dict[str, Any] = {}
-    for key, val in section.items():
-        vals = val.split("\n")
-        if len(vals) > 1 and vals[0] == "":
-            vals = vals[1:]
-        lst: List[Union[str, int]] = []
-        for el in vals:
-            try:
-                lst.append(int(el, 0))
-            except ValueError:
-                if el[0] == '"' and el[-1] == '"':
-                    el = el.strip('"').rstrip('"')
-                lst.append(el)
-        if not (
-            all([isinstance(x, int) for x in lst])
-            or all([isinstance(x, str) for x in lst])
-        ):
-            raise ValueError(
-                "Values of %s - %s are of different type", key, vals
-            )
-        if len(lst) == 1:
-            result[key] = lst[0]
-        else:
-            result[key] = lst
-    return result
-
-
-if __name__ == "__main__":
-    from sys import argv
+def probe_pmod(segment: bytes) -> Optional[ProtoModule]:
+    for pmod in pmods:
+        if pmod.probe_buffer(segment):
+            return pmod
+    return None
 
-    def _print_config(conf: ConfigParser) -> None:
-        for section in conf.sections():
-            print("section", section)
-            for option in conf.options(section):
-                print("    ", option, conf[section][option])
 
-    conf = readconfig(argv[1])
-    _print_config(conf)
-    print(normconf(conf["termconfig"]))
+def pmod_for_proto(proto: str) -> Optional[ProtoModule]:
+    for pmod in pmods:
+        if pmod.proto_handled(proto):
+            return pmod
+    return None