bitbake/PRservice: Added no_hist mode and export/import.

[YOCTO #1556]
1. Added the package_arch into the index to the DB table. Because the
change in PACKAGE_ARCH will results in different checksum, and it is
better to have seperate PR value domains for differnt PACKAGE_ARCH of
the same pakcage.

2. Changed the PR service to operate in no history mode. In this mode,
the for a given query tuple (version, pkgarch, checksum), the returned
value will be the largest among all the values of the same (version,
pkgarch). This means the PR value returned can NOT be decremented.

3. Added export function. For each (version, pkgarch) tuple, only the
record with the maximum value will be exported.

4. Added import function. The record will only be imported if the
imported value is larger than the value stored in the DB with the same
(version, pkgarch, checksum) tuple.

Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 69 insertions, 37 deletions

diff --git a/lib/prserv/serv.py b/lib/prserv/serv.py
index 2f488f489..7bcffa774 100644
--- a/lib/prserv/serv.py
+++ b/lib/prserv/serv.py
@@ -21,6 +21,8 @@ class Handler(SimpleXMLRPCRequestHandler):
             raise
         return value
 
+PIDPREFIX = "/tmp/PRServer_%s_%s.pid"
+
 class PRServer(SimpleXMLRPCServer):
     pidfile="/tmp/PRServer.pid"
     def __init__(self, dbfile, logfile, interface, daemon=True):
@@ -34,20 +36,33 @@ class PRServer(SimpleXMLRPCServer):
         self.host, self.port = self.socket.getsockname()
         self.db=prserv.db.PRData(dbfile)
         self.table=self.db["PRMAIN"]
+        self.pidfile=PIDPREFIX % interface
 
         self.register_function(self.getPR, "getPR")
         self.register_function(self.quit, "quit")
         self.register_function(self.ping, "ping")
+        self.register_function(self.export, "export")
+        self.register_function(self.importone, "importone")
         self.register_introspection_functions()
+        
+    def export(self, version=None, pkgarch=None, checksum=None, colinfo=True):
+        try:
+            return self.table.export(version, pkgarch, checksum, colinfo)
+        except sqlite3.Error as exc:
+            logging.error(str(exc))
+            return None
+
+    def importone(self, version, pkgarch, checksum, value):
+        return self.table.importone(version, pkgarch, checksum, value)
 
     def ping(self):
         return not self.quit
- 
-    def getPR(self, version, checksum):
+
+    def getPR(self, version, pkgarch, checksum):
         try:
-            return self.table.getValue(version,checksum)
+            return self.table.getValue(version, pkgarch, checksum)
         except prserv.NotFoundError:
-            logging.error("can not find value for (%s, %s)",version,checksum)
+            logging.error("can not find value for (%s, %s)",version, checksum)
             return None
         except sqlite3.Error as exc:
             logging.error(str(exc))
@@ -69,28 +84,34 @@ class PRServer(SimpleXMLRPCServer):
 
     def start(self):
         if self.daemon is True:
-            logging.info("PRServer: starting daemon...")
+            logging.info("PRServer: try to start daemon...")
             self.daemonize()
         else:
-            logging.info("PRServer: starting...")
+            atexit.register(self.delpid)
+            pid = str(os.getpid()) 
+            pf = file(self.pidfile, 'w+')
+            pf.write("%s\n" % pid)
+            pf.write("%s\n" % self.host)
+            pf.write("%s\n" % self.port)
+            pf.close()
+            logging.info("PRServer: start success! DBfile: %s, IP: %s, PORT: %d" % 
+                     (self.dbfile, self.host, self.port))
             self._serve_forever()
 
     def delpid(self):
-        os.remove(PRServer.pidfile)
+        os.remove(self.pidfile)
 
     def daemonize(self):
         """
         See Advanced Programming in the UNIX, Sec 13.3
         """
-        os.umask(0)
-
         try:
             pid = os.fork()
-            if pid > 0: 
-                sys.exit(0)
+            if pid > 0:
+                #parent return instead of exit to give control 
+                return
         except OSError as e:
-            sys.stderr.write("1st fork failed: %d %s\n" % (e.errno, e.strerror))
-            sys.exit(1)
+            raise Exception("%s [%d]" % (e.strerror, e.errno))
 
         os.setsid()
         """
@@ -102,9 +123,9 @@ class PRServer(SimpleXMLRPCServer):
             if pid > 0: #parent
                 sys.exit(0)
         except OSError as e:
-            sys.stderr.write("2nd fork failed: %d %s\n" % (e.errno, e.strerror))
-            sys.exit(1)
+            raise Exception("%s [%d]" % (e.strerror, e.errno))
 
+        os.umask(0)
         os.chdir("/")
 
         sys.stdout.flush()
@@ -119,13 +140,15 @@ class PRServer(SimpleXMLRPCServer):
         # write pidfile
         atexit.register(self.delpid)
         pid = str(os.getpid()) 
-        pf = file(PRServer.pidfile, 'w+')
+        pf = file(self.pidfile, 'w')
         pf.write("%s\n" % pid)
-        pf.write("%s\n" % self.host)
-        pf.write("%s\n" % self.port)
         pf.close()
 
+        logging.info("PRServer: starting daemon success! DBfile: %s, IP: %s, PORT: %s, PID: %s" % 
+                     (self.dbfile, self.host, self.port, pid))
+
         self._serve_forever()
+        exit(0)
 
 class PRServerConnection():
     def __init__(self, host, port):
@@ -139,16 +162,22 @@ class PRServerConnection():
         socket.setdefaulttimeout(2)
         try:
             self.connection.quit()
-        except:
-            pass
+        except Exception as exc:
+            sys.stderr.write("%s\n" % str(exc))
 
-    def getPR(self, version, checksum):
-        return self.connection.getPR(version, checksum)
+    def getPR(self, version, pkgarch, checksum):
+        return self.connection.getPR(version, pkgarch, checksum)
 
     def ping(self):
         return self.connection.ping()
 
-def start_daemon(options):
+    def export(self,version=None, pkgarch=None, checksum=None, colinfo=True):
+        return self.connection.export(version, pkgarch, checksum, colinfo)
+    
+    def importone(self, version, pkgarch, checksum, value):
+        return self.connection.importone(version, pkgarch, checksum, value)
+
+def start_daemon(dbfile, logfile, interface):
     try:
         pf = file(PRServer.pidfile,'r')
         pid = int(pf.readline().strip())
@@ -159,40 +188,43 @@ def start_daemon(options):
     if pid:
         sys.stderr.write("pidfile %s already exist. Daemon already running?\n"
                             % PRServer.pidfile)
-        sys.exit(1)
+        return 1
 
-    server = PRServer(options.dbfile, interface=(options.host, options.port),
-                      logfile=os.path.abspath(options.logfile))
+    server = PRServer(os.path.abspath(dbfile), os.path.abspath(logfile), interface)
     server.start()
+    return 0
 
-def stop_daemon():
+def stop_daemon(host, port):
+    pidfile = PIDPREFIX % (host, port)
     try:
-        pf = file(PRServer.pidfile,'r')
+        pf = file(pidfile,'r')
         pid = int(pf.readline().strip())
-        host = pf.readline().strip()
-        port = int(pf.readline().strip())
         pf.close()
     except IOError:
         pid = None
 
     if not pid:
         sys.stderr.write("pidfile %s does not exist. Daemon not running?\n"
-                        % PRServer.pidfile)
-        sys.exit(1)
+                        % pidfile)
+        return 1
 
-    PRServerConnection(host,port).terminate()
+    PRServerConnection(host, port).terminate()
     time.sleep(0.5)
 
     try:
         while 1:
             os.kill(pid,signal.SIGTERM)
             time.sleep(0.1)
-    except OSError as err:
-        err = str(err)
+    except OSError as e:
+        err = str(e)
         if err.find("No such process") > 0:
             if os.path.exists(PRServer.pidfile):
                 os.remove(PRServer.pidfile)
         else:
-            print err
-            sys.exit(1)
+            raise Exception("%s [%d]" % (e.strerror, e.errno))
+
+    return 0
 
+def ping(host, port):
+    print PRServerConnection(host,port).ping()
+    return 0