bitbake: hashserv: Add unihash-exists API

Adds API to check if the server is aware of the existence of a given
unihash. This can be used as an optimization for sstate where a client
can query the hash equivalence server to check if a unihash exists
before querying the sstate cache. If the hash server isn't aware of the
existence of a unihash, then there is very likely not a matching sstate
object, so this should be able to significantly cut down on the number
of negative hits on the sstate cache.

(Bitbake rev: cfe0ac071cfb998e4a1dd263f8860b140843361a)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/hashserv/sqlalchemy.py

@@ -48,6 +48,7 @@ class UnihashesV3(Base):
     __table_args__ = (
         UniqueConstraint("method", "taskhash"),
         Index("taskhash_lookup_v4", "method", "taskhash"),
+        Index("unihash_lookup_v1", "unihash"),
     )
 
 
@@ -279,6 +280,16 @@ class Database(object):
             )
             return map_row(result.first())
 
+    async def unihash_exists(self, unihash):
+        async with self.db.begin():
+            result = await self._execute(
+                select(UnihashesV3)
+                .where(UnihashesV3.unihash == unihash)
+                .limit(1)
+            )
+
+            return result.first() is not None
+
     async def get_outhash(self, method, outhash):
         async with self.db.begin():
             result = await self._execute(