cascache.py: add a 'log_level' parameter and use it to run buildbox-casd

This changes how we instantiate the CASCache by reusing the log level
parameters from BuildStream and forward them to buildbox-casd.

By default, buildbox-casd will now have '--log-level warning', and
--verbose will enable 'info' and --debug will enable 'trace'.

This way, we can easily tweak buildbox-casd's verbosity

3 files changed, 23 insertions, 4 deletions

diff --git a/src/buildstream/_cas/__init__.py b/src/buildstream/_cas/__init__.py
index 17e3a3fd9..3c6cd7db6 100644
--- a/src/buildstream/_cas/__init__.py
+++ b/src/buildstream/_cas/__init__.py
@@ -17,5 +17,5 @@
 #  Authors:
 #        Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
 
-from .cascache import CASCache
+from .cascache import CASCache, CASLogLevel
 from .casremote import CASRemote
diff --git a/src/buildstream/_cas/cascache.py b/src/buildstream/_cas/cascache.py
index a62bc3d44..f7855afc4 100644
--- a/src/buildstream/_cas/cascache.py
+++ b/src/buildstream/_cas/cascache.py
@@ -38,6 +38,7 @@ from .._protos.build.bazel.remote.execution.v2 import remote_execution_pb2, remo
 from .._protos.build.buildgrid import local_cas_pb2, local_cas_pb2_grpc
 
 from .. import _signals, utils
+from ..types import FastEnum
 from .._exceptions import CASCacheError
 from .._message import Message, MessageType
 
@@ -52,6 +53,12 @@ _CACHE_USAGE_REFRESH = 5
 _CASD_MAX_LOGFILES = 10
 
 
+class CASLogLevel(FastEnum):
+    WARNING = "warning"
+    INFO = "info"
+    TRACE = "trace"
+
+
 # A CASCache manages a CAS repository as specified in the Remote Execution API.
 #
 # Args:
@@ -59,10 +66,13 @@ _CASD_MAX_LOGFILES = 10
 #     casd (bool): True to spawn buildbox-casd (default) or False (testing only)
 #     cache_quota (int): User configured cache quota
 #     protect_session_blobs (bool): Disable expiry for blobs used in the current session
+#     log_level (LogLevel): Log level to give to buildbox-casd for logging
 #
 class CASCache():
 
-    def __init__(self, path, *, casd=True, cache_quota=None, protect_session_blobs=True):
+    def __init__(
+            self, path, *, casd=True, cache_quota=None, protect_session_blobs=True, log_level=CASLogLevel.WARNING
+    ):
         self.casdir = os.path.join(path, 'cas')
         self.tmpdir = os.path.join(path, 'tmp')
         os.makedirs(os.path.join(self.casdir, 'refs', 'heads'), exist_ok=True)
@@ -77,6 +87,7 @@ class CASCache():
 
             casd_args = [utils.get_host_tool('buildbox-casd')]
             casd_args.append('--bind=unix:' + self._casd_socket_path)
+            casd_args.append('--log-level=' + log_level.value)
 
             if cache_quota is not None:
                 casd_args.append('--quota-high={}'.format(int(cache_quota)))
diff --git a/src/buildstream/_context.py b/src/buildstream/_context.py
index 52dcfbdcd..7ff993166 100644
--- a/src/buildstream/_context.py
+++ b/src/buildstream/_context.py
@@ -28,7 +28,7 @@ from ._profile import Topics, PROFILER
 from ._platform import Platform
 from ._artifactcache import ArtifactCache
 from ._sourcecache import SourceCache
-from ._cas import CASCache
+from ._cas import CASCache, CASLogLevel
 from .types import _CacheBuildTrees, _SchedulerErrorAction
 from ._workspaces import Workspaces, WorkspaceProjectCache
 from .node import Node
@@ -513,9 +513,17 @@ class Context():
 
     def get_cascache(self):
         if self._cascache is None:
+            if self.log_debug:
+                log_level = CASLogLevel.TRACE
+            elif self.log_verbose:
+                log_level = CASLogLevel.INFO
+            else:
+                log_level = CASLogLevel.WARNING
+
             self._cascache = CASCache(self.cachedir,
                                       casd=self.use_casd,
-                                      cache_quota=self.config_cache_quota)
+                                      cache_quota=self.config_cache_quota,
+                                      log_level=log_level)
         return self._cascache
 
     # is_fork_allowed():