X-Git-Url: http://www.average.org/gitweb/?a=blobdiff_plain;f=gps303%2Fevstore.py;h=bb47f3fb21c9c34c178955dbfad7e84e09828dbe;hb=8bf5efdf4f5d069b108e6fd8140f5ebd930b538e;hp=70a3ac6618bec9bd67f53ff7fa9a30a6d92484c4;hpb=623ff0272e0344c26549bbed937d1d33b9822d18;p=loctrkd.git

diff --git a/gps303/evstore.py b/gps303/evstore.py
index 70a3ac6..bb47f3f 100644
--- a/gps303/evstore.py
+++ b/gps303/evstore.py
@@ -1,8 +1,8 @@
 """ sqlite event store """
 
-from sqlite3 import connect
+from sqlite3 import connect, OperationalError
 
-__all__ = "initdb", "stow"
+__all__ = "fetch", "initdb", "stow"
 
 DB = None
 
@@ -10,6 +10,7 @@ SCHEMA = """create table if not exists events (
     tstamp real not null,
     imei text,
     peeraddr text not null,
+    is_incoming int not null default TRUE,
     proto int not null,
     packet blob
 )"""
@@ -18,7 +19,13 @@ SCHEMA = """create table if not exists events (
 def initdb(dbname):
     global DB
     DB = connect(dbname)
-    DB.execute(SCHEMA)
+    try:
+        DB.execute(
+            """alter table events add column
+                is_incoming int not null default TRUE"""
+        )
+    except OperationalError:
+        DB.execute(SCHEMA)
 
 
 def stow(**kwargs):
@@ -26,6 +33,7 @@ def stow(**kwargs):
     parms = {
         k: kwargs[k] if k in kwargs else v
         for k, v in (
+            ("is_incoming", True),
             ("peeraddr", None),
             ("when", 0.0),
             ("imei", None),
@@ -36,10 +44,25 @@ def stow(**kwargs):
     assert len(kwargs) <= len(parms)
     DB.execute(
         """insert or ignore into events
-                (tstamp, imei, peeraddr, proto, packet)
+                (tstamp, imei, peeraddr, proto, packet, is_incoming)
                 values
-                (:when, :imei, :peeraddr, :proto, :packet)
+                (:when, :imei, :peeraddr, :proto, :packet, :is_incoming)
         """,
         parms,
     )
     DB.commit()
+
+
+def fetch(imei, protos, backlog):
+    assert DB is not None
+    protosel = ", ".join(["?" for _ in range(len(protos))])
+    cur = DB.cursor()
+    cur.execute(
+        f"""select packet from events
+                    where proto in ({protosel}) and imei = ?
+                    order by tstamp desc limit ?""",
+        protos + (imei, backlog),
+    )
+    result = [row[0] for row in cur]
+    cur.close()
+    return result