[08/12] prserv: add extra requests

diff --git a/lib/prserv/client.py b/lib/prserv/client.py
index 7bc5188c53..8471ee3046 100644
--- a/lib/prserv/client.py
+++ b/lib/prserv/client.py
@@ -20,6 +20,27 @@  class PRAsyncClient(bb.asyncrpc.AsyncClient):
         if response:
             return response["value"]
 
+    async def test_pr(self, version, pkgarch, checksum):
+        response = await self.invoke(
+            {"test-pr": {"version": version, "pkgarch": pkgarch, "checksum": checksum}}
+        )
+        if response:
+            return response["value"]
+
+    async def test_package(self, version, pkgarch):
+        response = await self.invoke(
+            {"test-package": {"version": version, "pkgarch": pkgarch}}
+        )
+        if response:
+            return response["value"]
+
+    async def max_package_pr(self, version, pkgarch):
+        response = await self.invoke(
+            {"max-package-pr": {"version": version, "pkgarch": pkgarch}}
+        )
+        if response:
+            return response["value"]
+
     async def importone(self, version, pkgarch, checksum, value):
         response = await self.invoke(
             {"import-one": {"version": version, "pkgarch": pkgarch, "checksum": checksum, "value": value}}
@@ -44,7 +65,7 @@  class PRAsyncClient(bb.asyncrpc.AsyncClient):
 class PRClient(bb.asyncrpc.Client):
     def __init__(self):
         super().__init__()
-        self._add_methods("getPR", "importone", "export", "is_readonly")
+        self._add_methods("getPR", "test_pr", "test_package", "importone", "export", "is_readonly")
 
     def _get_async_client(self):
         return PRAsyncClient()
diff --git a/lib/prserv/db.py b/lib/prserv/db.py
index 7bc2b2dc2d..14b36ea6c9 100644
--- a/lib/prserv/db.py
+++ b/lib/prserv/db.py
@@ -78,12 +78,58 @@  class PRTable(object):
             self.sync()
             self.dirty = False
 
-    def _get_value_hist(self, version, pkgarch, checksum):
+    def test_package(self, version, pkgarch):
+        """Returns whether the specified package version is found in the database for the specified architecture"""
+
+	# Just returns the value if found or None otherwise
+        data=self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=?;" % self.table,
+                           (version, pkgarch))
+        row=data.fetchone()
+        if row is not None:
+            return True
+        else:
+            return False
+
+    def test_value(self, version, pkgarch, value):
+        """Returns whether the specified value is found in the database for the specified package and architecture"""
+
+	# Just returns the value if found or None otherwise
+        data=self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? and value=?;" % self.table,
+                           (version, pkgarch, value))
+        row=data.fetchone()
+        if row is not None:
+            return True
+        else:
+            return False
+
+    def find_value(self, version, pkgarch, checksum):
+        """Unlike get_value, just returns the value if found or None otherwise. Doesn't create a new value"""
+
         data=self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? AND checksum=?;" % self.table,
                            (version, pkgarch, checksum))
         row=data.fetchone()
         if row is not None:
             return row[0]
+        else:
+            return None
+
+    def find_max_value(self, version, pkgarch):
+        """Returns the greatest value for (version, pkgarch), or "0" if not found. Doesn't create a new value"""
+
+        data = self._execute("SELECT max(value) FROM %s where version=? AND pkgarch=?;" % (self.table),
+                             (version, pkgarch))
+        row = data.fetchone()
+        if row is not None:
+            return row[0]
+        else:
+            return "0"
+
+    def _get_value_hist(self, version, pkgarch, checksum):
+
+        val = find_value(self, version, pkgarch, checksum)
+
+        if val is not None:
+            return val
         else:
             #no value found, try to insert
             if self.read_only:
diff --git a/lib/prserv/serv.py b/lib/prserv/serv.py
index efb2e0cf93..473dfa790c 100644
--- a/lib/prserv/serv.py
+++ b/lib/prserv/serv.py
@@ -26,6 +26,9 @@  class PRServerClient(bb.asyncrpc.AsyncServerConnection):
 
         self.handlers.update({
             "get-pr": self.handle_get_pr,
+            "test-pr": self.handle_test_pr,
+            "test-package": self.handle_test_package,
+            "max-package-pr": self.handle_max_package_pr,
             "import-one": self.handle_import_one,
             "export": self.handle_export,
             "is-readonly": self.handle_is_readonly,
@@ -43,6 +46,31 @@  class PRServerClient(bb.asyncrpc.AsyncServerConnection):
         else:
             self.server.table.sync_if_dirty()
 
+    async def handle_test_pr(self, request):
+        '''Finds the PR value corresponding to the request. If not found, returns None and doesn't insert a new value'''
+        version = request["version"]
+        pkgarch = request["pkgarch"]
+        checksum = request["checksum"]
+
+        value = self.server.table.find_value(version, pkgarch, checksum)
+        return {"value": value}
+
+    async def handle_test_package(self, request):
+        '''Tells whether there are entries for (version, pkgarch) in the db. Returns True or False'''
+        version = request["version"]
+        pkgarch = request["pkgarch"]
+
+        value = self.server.table.test_package(version, pkgarch)
+        return {"value": value}
+
+    async def handle_max_package_pr(self, request):
+        '''Finds the greatest PR value for (version, pkgarch) in the db. Returns 0 if no entry was found'''
+        version = request["version"]
+        pkgarch = request["pkgarch"]
+
+        value = self.server.table.find_max_value(version, pkgarch)
+        return {"value": value}
+
     async def handle_get_pr(self, request):
         version = request["version"]
         pkgarch = request["pkgarch"]