From d72247b46519609fb0b373d34bcc5d5939d7b9c3 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Tue, 17 Jul 2018 00:42:19 +0200
Subject: wip

---
 src/ee/fact/__init__.py | 276 +++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 214 insertions(+), 62 deletions(-)

(limited to 'src/ee/fact')

diff --git a/src/ee/fact/__init__.py b/src/ee/fact/__init__.py
index 659558f..959e755 100644
--- a/src/ee/fact/__init__.py
+++ b/src/ee/fact/__init__.py
@@ -1,97 +1,249 @@
-from typing import Optional, Mapping
-import os.path
+from typing import Optional, Mapping, List
 import configparser
+import os
+from pathlib import Path
+from functools import total_ordering
+import logging
+
+logger = logging.getLogger(__name__)
+
+@total_ordering
+class ObjectType(object):
+    def __init__(self, name: str):
+        self._name = name
+        self._fields = []
+        self._objects = {}
+
+    def __eq__(self, o: object) -> bool:
+        other = o  # type ObjectType
+        return isinstance(o, ObjectType) and self._name == other._name
+
+    def __lt__(self, o: object) -> bool:
+        if not isinstance(o, ObjectType):
+            return True
 
-class ObjectDescriptor(object):
-    def __init__(self):
-        self._keys = []
+        other = o  # type ObjectType
+        return (self._name) < (self._name)
 
-    def index_of(self, key, create: bool = False) -> int:
+    def __hash__(self) -> int:
+        return self._name.__hash__()
+
+    def by_key(self, key: str) -> "Object":
         try:
-            return self._keys.index(key)
+            return self._objects[key]
+        except ValueError:
+            o = Object(self, key, {}, {})
+            self._objects[key] = o
+            return o
+
+    @property
+    def name(self):
+        return self._name
+
+    @property
+    def fields(self):
+        return self._fields
+
+    def index_of(self, field: str, create: bool = False) -> int:
+        try:
+            return self._fields.index(field)
         except ValueError as e:
             if not create:
                 raise e
 
-            self._keys.append(key)
-            return len(self._keys) - 1
-
-    @property
-    def keys(self):
-        return self._keys
+            self._fields.append(field)
+            return len(self._fields) - 1
 
 class Object(object):
-    def __init__(self, key, descriptor):
+    def __init__(self, ds: "DataSet", ot: ObjectType, key: str):
+        self._ds = ds
+        self._ot = ot
         self._key = key
-        self._descriptor = descriptor
         self._data = []
 
+    @property
+    def object_type(self):
+        return self._ot
+
     @property
     def key(self):
         return self._key
 
     def set(self, key: str, value: str):
-        idx = self._descriptor.index_of(key, create=True)
+        if self._ds._frozen:
+            raise Exception("This data set is frozen")
+        idx = self._ot.index_of(key, create=True)
         self._data.insert(idx, value)
 
-    def merge(self, kv: Mapping[str, str]):
-        for k, v in kv.items():
-            self.set(k, v)
+    def _set_from_object(self, other: "Object"):
+        for k in other._ot.fields:
+            self.set(k, other.get(k))
 
     def get(self, key: str) -> Optional[str]:
-        return self._data[self._descriptor.index_of(key)]
+        idx = self._ot.index_of(key)
+        return self._data[idx]
 
-class ObjectSet(object):
-    def __init__(self, meta = dict()):
-        self._objects = {}
-        self._meta = meta
-        self._descriptor = ObjectDescriptor()
+class DataSet(object):
+    def __init__(self, name):
+        self._name = name
+        self._object_types = {}
+        self._objects_by_type = {} # type: Mapping[str, Mapping[str, Object]]
+        self._frozen = False
+        self._changed = False
+
+    @property
+    def name(self):
+        return self._name
+
+    def freeze(self):
+        self._frozen = True
+
+    def get_object_type(self, object_type: str) -> ObjectType:
+        try:
+            return self._object_types[object_type]
+        except KeyError:
+            ot = ObjectType(object_type)
+            self._object_types[object_type] = ot
+            self._changed = True
+            return ot
+
+    def get_object(self, object_type: str, key: str) -> Object:
+        try:
+            objects = self._objects_by_type[object_type]
+        except KeyError:
+            if self._frozen:
+                raise Exception("This data set is frozen")
+
+            objects = {}
+            self._objects_by_type[object_type] = objects
+            self._changed = True
+
+        try:
+            return objects[key]
+        except KeyError:
+            if self._frozen:
+                raise Exception("This data set is frozen")
+
+            ot = self.get_object_type(object_type)
+            o = Object(self, ot, key)
+            objects[key] = o
+            self._changed = True
+            return o
 
     def items(self):
-        return self._objects.values()
-
-    def create_object(self, key: str):
-        if key in self._objects:
-            raise ValueError("Object already exists: {}".format(key))
-        o = Object(key, self._descriptor)
-        self._objects[key] = o
-        return o
-
-    def read(self, path):
-        from pathlib import Path
-        print("Reading objects from {}".format(path))
-        for p in Path(path).glob("*.ini"):
-            if p.name == "object-set.ini":
-                continue
+        from itertools import chain
+        return list(chain.from_iterable([objects.values() for objects in self._objects_by_type.values()]))
 
-            with open(p, "r") as f:
-                ini = configparser.ConfigParser(interpolation = None)
-                ini.read(p)
+    def merge(self, other: "DataSet") -> "DataSet":
+        ds = DataSet(self._name)
+        for objects in self._objects_by_type.values():
+            for o in objects.values():
+                ds.get_object(o.object_type.name, o.key)._set_from_object(o)
 
-                key = ini.get("meta", "key")
+        for objects in other._objects_by_type.values():
+            for o in objects.values():
+                ds.get_object(o.object_type.name, o.key)._set_from_object(o)
 
-                o = self.create_object(key)
-                o.merge({k:v for k, v in ini.items("values")})
-        print("Read {} objects".format(len(self._objects)))
+        return ds
 
-    def write(self, path):
-        print("Writing {} objects".format(len(self._objects)))
+class DataSetManager(object):
+    def __init__(self, basedir: Path):
+        self._basedir = Path(basedir)
 
-        ini = configparser.ConfigParser(interpolation = None)
-        ini.add_section("object-set")
-        with open(os.path.join(path, "object-set.ini"), "w") as f:
-            ini.write(f)
+    def metafile_for_ds(self, ds_name) -> Path:
+        return self._basedir / ds_name / "data-set.ini"
+
+    def create_rw(self, name, inputs: List[str]) -> "LazyDataSet":
+        return LazyDataSet(self, name, inputs)
+
+    def load(self, name, freeze=False) -> DataSet:
+        ds_dir = Path(name) if Path(name).is_absolute() else self._basedir / name
+        ds_dir = ds_dir if ds_dir.is_dir() else ds_dir.parent
+
+        logger.info("Loading DS from '{}'".format(ds_dir))
 
-        for o in self._objects.values():
-            ini = configparser.ConfigParser(interpolation = None)
+        ini = self._load_ini(ds_dir / "data-set.ini")
+        name = ini.get("data-set", "name")
+
+        ds = DataSet(name)
+        count = 0
+        for ot_path in ds_dir.glob("*"):
+            if not ot_path.is_dir():
+                continue
+
+            ot = ot_path.name
+            logger.info("  Loading type '{}'".format(ot))
+            for o_path in ot_path.glob("*.ini"):
+                count += 1
+
+                key = o_path.name[:-4]
+                logger.info("    Loading key '{}'".format(key))
+                ini = self._load_ini(o_path)
+                o = ds.get_object(ot, key)
+                for k, v in ini.items("values"):
+                   o.set(k, v)
+
+        if freeze:
+            ds.freeze()
+
+        logger.info("Loaded {} items".format(count))
+        return ds
+
+    def store(self, ds: DataSet):
+        ds_dir = self._basedir / ds.name
+        logger.info("Storing DS '{}' with {} objects to {}".format(ds.name, len(ds.items()), ds_dir))
+
+        os.makedirs(ds_dir, exist_ok=True)
+        ini = self._blank_ini()
+        ini.add_section("data-set")
+        ini.set("data-set", "name", ds.name)
+        self._store_ini(ini, ds_dir / "data-set.ini")
+
+        for o in ds.items():
+            ot = o.object_type
+            key = o.key
+
+            ot_dir = ds_dir / ot.name
+            os.makedirs(ot_dir, exist_ok=True)
+            ini = self._blank_ini()
             ini.add_section("meta")
-            ini.set("meta", "key", o.key)
+            ini.set("meta", "type", ot.name)
 
             ini.add_section("values")
-            for key in sorted(self._descriptor.keys):
-                value = o.get(key)
-                if value:
-                    ini.set("values", key, value)
+            for k in ot.fields:
+                v = o.get(k)
+                ini.set("values", k, v)
+            self._store_ini(ini, ot_dir / "{}.ini".format(key))
+
+    def _blank_ini(self):
+        return configparser.ConfigParser(interpolation = None)
+
+    def _load_ini(self, path: Path):
+        ini = self._blank_ini()
+        if len(ini.read(str(path))) != 1:
+            raise IOError("Could not load ini file: {}".format(path))
+        return ini
+
+    def _store_ini(self, ini, path):
+        with open(path, "w") as f:
+            ini.write(f)
 
-            with open(os.path.join(path, "{}.ini".format(o.key)), "w") as f:
-                ini.write(f)
+class LazyDataSet(object):
+    def __init__(self, dsm: DataSetManager, name, inputs):
+        self._dsm = dsm
+        self._name = name
+        self._inputs = inputs
+
+    def __enter__(self):
+#        logger.info("enter: name={}, inputs={}".format(self._name, self._inputs))
+        ds = DataSet(self._name)
+        for name in self._inputs:
+            ds = ds.merge(self._dsm.load(name, freeze=True))
+        self._ds = ds
+        return self._ds
+
+    def __exit__(self, *args):
+#        logger.info("exit: name={}, inputs={}".format(self._name, self._inputs))
+#        logger.info("ds.size={}".format(len(self._ds.items())))
+        self._dsm.store(self._ds)
+        return False
-- 
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