Move from _base to events

1 files changed, 246 insertions, 0 deletions

diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 9242b0a84e..f960ef8350 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -17,6 +17,10 @@ from _base import SQLBaseStore, _RollbackButIsFineException
 
 from twisted.internet import defer
 
+from synapse.events import FrozenEvent
+from synapse.events.utils import prune_event
+from synapse.util import unwrap_deferred
+
 from synapse.util.logutils import log_function
 from synapse.api.constants import EventTypes
 from synapse.crypto.event_signing import compute_event_reference_hash
@@ -26,6 +30,7 @@ from syutil.jsonutil import encode_canonical_json
 from contextlib import contextmanager
 
 import logging
+import simplejson as json
 
 logger = logging.getLogger(__name__)
 
@@ -393,3 +398,244 @@ class EventsStore(SQLBaseStore):
         return self.runInteraction(
             "have_events", f,
         )
+
+    @defer.inlineCallbacks
+    def _get_events(self, event_ids, check_redacted=True,
+                    get_prev_content=False, allow_rejected=False, txn=None):
+        if not event_ids:
+            defer.returnValue([])
+
+        event_map = self._get_events_from_cache(
+            event_ids,
+            check_redacted=check_redacted,
+            get_prev_content=get_prev_content,
+            allow_rejected=allow_rejected,
+        )
+
+        missing_events_ids = [e for e in event_ids if e not in event_map]
+
+        if not missing_events_ids:
+            defer.returnValue([
+                event_map[e_id] for e_id in event_ids
+                if e_id in event_map and event_map[e_id]
+            ])
+
+        if not txn:
+            missing_events = yield self.runInteraction(
+                "_get_events",
+                self._fetch_events_txn,
+                missing_events_ids,
+                check_redacted=check_redacted,
+                get_prev_content=get_prev_content,
+                allow_rejected=allow_rejected,
+            )
+        else:
+            missing_events = yield self._fetch_events(
+                txn,
+                missing_events_ids,
+                check_redacted=check_redacted,
+                get_prev_content=get_prev_content,
+                allow_rejected=allow_rejected,
+            )
+
+        event_map.update(missing_events)
+
+        defer.returnValue([
+            event_map[e_id] for e_id in event_ids
+            if e_id in event_map and event_map[e_id]
+        ])
+
+
+    def _get_events_txn(self, txn, event_ids, check_redacted=True,
+                        get_prev_content=False, allow_rejected=False):
+        return unwrap_deferred(self._get_events(
+            event_ids,
+            check_redacted=check_redacted,
+            get_prev_content=get_prev_content,
+            allow_rejected=allow_rejected,
+            txn=txn,
+        ))
+
+    def _invalidate_get_event_cache(self, event_id):
+        for check_redacted in (False, True):
+            for get_prev_content in (False, True):
+                self._get_event_cache.invalidate(event_id, check_redacted,
+                                                 get_prev_content)
+
+    def _get_event_txn(self, txn, event_id, check_redacted=True,
+                       get_prev_content=False, allow_rejected=False):
+
+        events = self._get_events_txn(
+            txn, [event_id],
+            check_redacted=check_redacted,
+            get_prev_content=get_prev_content,
+            allow_rejected=allow_rejected,
+        )
+
+        return events[0] if events else None
+
+    def _get_events_from_cache(self, events, check_redacted, get_prev_content,
+                               allow_rejected):
+        event_map = {}
+
+        for event_id in events:
+            try:
+                ret = self._get_event_cache.get(
+                    event_id, check_redacted, get_prev_content
+                )
+
+                if allow_rejected or not ret.rejected_reason:
+                    event_map[event_id] = ret
+                else:
+                    event_map[event_id] = None
+            except KeyError:
+                pass
+
+        return event_map
+
+    def _fetch_events_txn(self, txn, events, check_redacted=True,
+                      get_prev_content=False, allow_rejected=False):
+        return unwrap_deferred(self._fetch_events(
+            txn, events,
+            check_redacted=check_redacted,
+            get_prev_content=get_prev_content,
+            allow_rejected=allow_rejected,
+        ))
+
+    @defer.inlineCallbacks
+    def _fetch_events(self, txn, events, check_redacted=True,
+                      get_prev_content=False, allow_rejected=False):
+        if not events:
+            defer.returnValue({})
+
+        rows = []
+        N = 200
+        for i in range(1 + len(events) / N):
+            evs = events[i*N:(i + 1)*N]
+            if not evs:
+                break
+
+            sql = (
+                "SELECT e.internal_metadata, e.json, r.redacts, rej.event_id "
+                " FROM event_json as e"
+                " LEFT JOIN rejections as rej USING (event_id)"
+                " LEFT JOIN redactions as r ON e.event_id = r.redacts"
+                " WHERE e.event_id IN (%s)"
+            ) % (",".join(["?"]*len(evs)),)
+
+            if txn:
+                txn.execute(sql, evs)
+                rows.extend(txn.fetchall())
+            else:
+                res = yield self._execute("_fetch_events", None, sql, *evs)
+                rows.extend(res)
+
+        res = yield defer.gatherResults(
+            [
+                defer.maybeDeferred(
+                    self._get_event_from_row,
+                    txn,
+                    row[0], row[1], row[2],
+                    check_redacted=check_redacted,
+                    get_prev_content=get_prev_content,
+                    rejected_reason=row[3],
+                )
+                for row in rows
+            ],
+            consumeErrors=True,
+        )
+
+        for e in res:
+            self._get_event_cache.prefill(
+                e.event_id, check_redacted, get_prev_content, e
+            )
+
+        defer.returnValue({
+            e.event_id: e
+            for e in res if e
+        })
+
+    @defer.inlineCallbacks
+    def _get_event_from_row(self, txn, internal_metadata, js, redacted,
+                            check_redacted=True, get_prev_content=False,
+                            rejected_reason=None):
+        d = json.loads(js)
+        internal_metadata = json.loads(internal_metadata)
+
+        def select(txn, *args, **kwargs):
+            if txn:
+                return self._simple_select_one_onecol_txn(txn, *args, **kwargs)
+            else:
+                return self._simple_select_one_onecol(
+                    *args,
+                    desc="_get_event_from_row", **kwargs
+                )
+
+        def get_event(txn, *args, **kwargs):
+            if txn:
+                return self._get_event_txn(txn, *args, **kwargs)
+            else:
+                return self.get_event(*args, **kwargs)
+
+        if rejected_reason:
+            rejected_reason = yield select(
+                txn,
+                table="rejections",
+                keyvalues={"event_id": rejected_reason},
+                retcol="reason",
+            )
+
+        ev = FrozenEvent(
+            d,
+            internal_metadata_dict=internal_metadata,
+            rejected_reason=rejected_reason,
+        )
+
+        if check_redacted and redacted:
+            ev = prune_event(ev)
+
+            redaction_id = yield select(
+                txn,
+                table="redactions",
+                keyvalues={"redacts": ev.event_id},
+                retcol="event_id",
+            )
+
+            ev.unsigned["redacted_by"] = redaction_id
+            # Get the redaction event.
+
+            because = yield get_event(
+                txn,
+                redaction_id,
+                check_redacted=False
+            )
+
+            if because:
+                ev.unsigned["redacted_because"] = because
+
+        if get_prev_content and "replaces_state" in ev.unsigned:
+            prev = yield get_event(
+                txn,
+                ev.unsigned["replaces_state"],
+                get_prev_content=False,
+            )
+            if prev:
+                ev.unsigned["prev_content"] = prev.get_dict()["content"]
+
+        defer.returnValue(ev)
+
+    def _parse_events(self, rows):
+        return self.runInteraction(
+            "_parse_events", self._parse_events_txn, rows
+        )
+
+    def _parse_events_txn(self, txn, rows):
+        event_ids = [r["event_id"] for r in rows]
+
+        return self._get_events_txn(txn, event_ids)
+
+    def _has_been_redacted_txn(self, txn, event):
+        sql = "SELECT event_id FROM redactions WHERE redacts = ?"
+        txn.execute(sql, (event.event_id,))
+        result = txn.fetchone()
+        return result[0] if result else None