From d61e21448953942ce90d457dad7189c0dda61bc7 Mon Sep 17 00:00:00 2001
From: Raoul Hidalgo Charman <raoul.hidalgocharman@codethink.co.uk>
Date: Fri, 21 Jun 2019 12:43:50 +0100
Subject: casserver.py: Add source service

Part of #1038
---
 src/buildstream/_cas/casserver.py | 40 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/src/buildstream/_cas/casserver.py b/src/buildstream/_cas/casserver.py
index 774548216..11fee64c3 100644
--- a/src/buildstream/_cas/casserver.py
+++ b/src/buildstream/_cas/casserver.py
@@ -35,7 +35,7 @@ from .._protos.build.bazel.remote.execution.v2 import remote_execution_pb2, remo
 from .._protos.google.bytestream import bytestream_pb2, bytestream_pb2_grpc
 from .._protos.google.rpc import code_pb2
 from .._protos.buildstream.v2 import buildstream_pb2, buildstream_pb2_grpc, \
-    artifact_pb2, artifact_pb2_grpc
+    artifact_pb2, artifact_pb2_grpc, source_pb2, source_pb2_grpc
 
 from .. import utils
 from .._exceptions import CASError
@@ -66,6 +66,7 @@ def create_server(repo, *, enable_push,
                   min_head_size=int(2e9)):
     cas = CASCache(os.path.abspath(repo))
     artifactdir = os.path.join(os.path.abspath(repo), 'artifacts', 'refs')
+    sourcedir = os.path.join(os.path.abspath(repo), 'source_protos')
 
     # Use max_workers default from Python 3.5+
     max_workers = (os.cpu_count() or 1) * 5
@@ -88,6 +89,9 @@ def create_server(repo, *, enable_push,
     artifact_pb2_grpc.add_ArtifactServiceServicer_to_server(
         _ArtifactServicer(cas, artifactdir), server)
 
+    source_pb2_grpc.add_SourceServiceServicer_to_server(
+        _SourceServicer(sourcedir), server)
+
     # Create up reference storage and artifact capabilities
     artifact_capabilities = buildstream_pb2.ArtifactCapabilities(
         allow_updates=enable_push)
@@ -518,6 +522,40 @@ class _BuildStreamCapabilitiesServicer(buildstream_pb2_grpc.CapabilitiesServicer
         return response
 
 
+class _SourceServicer(source_pb2_grpc.SourceServiceServicer):
+    def __init__(self, sourcedir):
+        self.sourcedir = sourcedir
+
+    def GetSource(self, request, context):
+        try:
+            source_proto = self._get_source(request.cache_key)
+        except FileNotFoundError:
+            context.abort(grpc.StatusCode.NOT_FOUND, "Source not found")
+        except DecodeError:
+            context.abort(grpc.StatusCode.NOT_FOUND,
+                          "Sources gives invalid directory")
+
+        return source_proto
+
+    def UpdateSource(self, request, context):
+        self._set_source(request.cache_key, request.source)
+        return request.source
+
+    def _get_source(self, cache_key):
+        path = os.path.join(self.sourcedir, cache_key)
+        source_proto = source_pb2.Source()
+        with open(path, 'r+b') as f:
+            source_proto.ParseFromString(f.read())
+            os.utime(path)
+            return source_proto
+
+    def _set_source(self, cache_key, source_proto):
+        path = os.path.join(self.sourcedir, cache_key)
+        os.makedirs(os.path.dirname(path), exist_ok=True)
+        with utils.save_file_atomic(path, 'w+b') as f:
+            f.write(source_proto.SerializeToString())
+
+
 def _digest_from_download_resource_name(resource_name):
     parts = resource_name.split('/')
 
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