SH-4489 New debug/dev settings for control over new mesh behavior

Added 'MeshUseGetMesh1' and 'MeshUseHttpRetryAfter' debug settings
to control mesh transport behavior.  First forces the use of the
legacy mesh fetch style with high concurrency and connection churn.
The second, on by default, honors Retry-After values if they are
reasonable.  If off or unreasonable, internal delay times are used.

2 files changed, 29 insertions, 1 deletions

diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 47a2f402af..9948f9974a 100755
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -9980,6 +9980,28 @@
     <key>Value</key>
     <integer>32</integer>
   </map>
+  <key>MeshUseHttpRetryAfter</key>
+  <map>
+    <key>Comment</key>
+    <string>If TRUE, use Retry-After response headers when rescheduling a mesh request that fails with an HTTP 503 status.</string>
+    <key>Persist</key>
+    <integer>1</integer>
+    <key>Type</key>
+    <string>Boolean</string>
+    <key>Value</key>
+    <boolean>1</boolean>
+  </map>
+  <key>MeshUseGetMesh1</key>
+  <map>
+    <key>Comment</key>
+    <string>If TRUE, use the legacy GetMesh capability for mesh download requests.</string>
+    <key>Persist</key>
+    <integer>1</integer>
+    <key>Type</key>
+    <string>Boolean</string>
+    <key>Value</key>
+    <boolean>0</boolean>
+  </map>
    <key>RunMultipleThreads</key>
     <map>
       <key>Comment</key>
diff --git a/indra/newview/llmeshrepository.cpp b/indra/newview/llmeshrepository.cpp
index f6a85ac94f..507797a85d 100755
--- a/indra/newview/llmeshrepository.cpp
+++ b/indra/newview/llmeshrepository.cpp
@@ -743,8 +743,10 @@ LLMeshRepoThread::LLMeshRepoThread()
 	mHttpRequest = new LLCore::HttpRequest;
 	mHttpOptions = new LLCore::HttpOptions;
 	mHttpOptions->setTransferTimeout(SMALL_MESH_XFER_TIMEOUT);
+	mHttpOptions->setUseRetryAfter(gSavedSettings.getBOOL("MeshUseHttpRetryAfter"));
 	mHttpLargeOptions = new LLCore::HttpOptions;
 	mHttpLargeOptions->setTransferTimeout(LARGE_MESH_XFER_TIMEOUT);
+	mHttpLargeOptions->setUseRetryAfter(gSavedSettings.getBOOL("MeshUseHttpRetryAfter"));
 	mHttpHeaders = new LLCore::HttpHeaders;
 	mHttpHeaders->append("Accept", "application/vnd.ll.mesh");
 	mHttpPolicyClass = LLAppViewer::instance()->getAppCoreHttp().getPolicy(LLAppCoreHttp::AP_MESH2);
@@ -1828,6 +1830,7 @@ LLMeshUploadThread::LLMeshUploadThread(LLMeshUploadThread::instance_list& data,
 	mHttpRequest = new LLCore::HttpRequest;
 	mHttpOptions = new LLCore::HttpOptions;
 	mHttpOptions->setTransferTimeout(mMeshUploadTimeOut);
+	mHttpOptions->setUseRetryAfter(gSavedSettings.getBOOL("MeshUseHttpRetryAfter"));
 	mHttpHeaders = new LLCore::HttpHeaders;
 	mHttpHeaders->append("Content-Type", "application/llsd+xml");
 	mHttpPolicyClass = LLAppViewer::instance()->getAppCoreHttp().getPolicy(LLAppCoreHttp::AP_UPLOADS);
@@ -3211,13 +3214,16 @@ void LLMeshRepository::notifyLoadedMeshes()
 			
 			if (gAgent.getRegion()->getName() != region_name && gAgent.getRegion()->capabilitiesReceived())
 			{
+				const bool use_v1(gSavedSettings.getBOOL("MeshUseGetMesh1"));
+
 				region_name = gAgent.getRegion()->getName();
 				mGetMeshCapability = gAgent.getRegion()->getCapability("GetMesh");
 				mGetMesh2Capability = gAgent.getRegion()->getCapability("GetMesh2");
-				mGetMeshVersion = mGetMesh2Capability.empty() ? 1 : 2;
+				mGetMeshVersion = (mGetMesh2Capability.empty() || use_v1) ? 1 : 2;
 				LL_DEBUGS(LOG_MESH) << "Retrieving caps for region '" << region_name
 									<< "', GetMesh2:  " << mGetMesh2Capability
 									<< ", GetMesh:  " << mGetMeshCapability
+									<< ", using version:  " << mGetMeshVersion
 									<< LL_ENDL;
 			}
 		}