bitbake: cooker/hashserv: Allow autostarting of a local hash server using BB_HASHSERVE

Its useful, particularly in the local developer model of usage, for
bitbake to start and stop a hash equivalence server on local port,
rather than relying on one being started by the user before the build.

The new BB_HASHSERVE variable supports this.

The database handling is moved internally into the hashserv code so that
different threads/processes can be used for the server without errors.

(Bitbake rev: a4fa8f1bd88995ae60e10430316fbed63d478587)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/hashserv/__init__.py

@@ -18,8 +18,15 @@ class HashEquivalenceServer(BaseHTTPRequestHandler):
     def log_message(self, f, *args):
         logger.debug(f, *args)
 
+    def opendb(self):
+        self.db = sqlite3.connect(self.dbname)
+        self.db.row_factory = sqlite3.Row
+
     def do_GET(self):
         try:
+            if not self.db:
+                self.opendb()
+
             p = urllib.parse.urlparse(self.path)
 
             if p.path != self.prefix + '/v1/equivalent':
@@ -52,6 +59,9 @@ class HashEquivalenceServer(BaseHTTPRequestHandler):
 
     def do_POST(self):
         try:
+            if not self.db:
+                self.opendb()
+
             p = urllib.parse.urlparse(self.path)
 
             if p.path != self.prefix + '/v1/equivalent':
@@ -123,14 +133,17 @@ class HashEquivalenceServer(BaseHTTPRequestHandler):
             self.send_error(400, explain=traceback.format_exc())
             return
 
-def create_server(addr, db, prefix=''):
+def create_server(addr, dbname, prefix=''):
     class Handler(HashEquivalenceServer):
         pass
 
-    Handler.prefix = prefix
-    Handler.db = db
+    db = sqlite3.connect(dbname)
     db.row_factory = sqlite3.Row
 
+    Handler.prefix = prefix
+    Handler.db = None
+    Handler.dbname = dbname
+
     with contextlib.closing(db.cursor()) as cursor:
         cursor.execute('''
             CREATE TABLE IF NOT EXISTS tasks_v2 (