[test] add ability to take the OnlineFileSource offline

This functionality is used for testing to ensure correct offline behavior when connectivity is missing.

4 files changed, 39 insertions, 4 deletions

diff --git a/include/mbgl/storage/default_file_source.hpp b/include/mbgl/storage/default_file_source.hpp
index 9911e0ce67..91e442cf85 100644
--- a/include/mbgl/storage/default_file_source.hpp
+++ b/include/mbgl/storage/default_file_source.hpp
@@ -140,6 +140,7 @@ public:
     void resume();
 
     // For testing only.
+    void setOnlineStatus(bool);
     void put(const Resource&, const Response&);
 
     class Impl;
diff --git a/include/mbgl/storage/online_file_source.hpp b/include/mbgl/storage/online_file_source.hpp
index ffd75662e6..28d70ce544 100644
--- a/include/mbgl/storage/online_file_source.hpp
+++ b/include/mbgl/storage/online_file_source.hpp
@@ -24,6 +24,9 @@ public:
 
     std::unique_ptr<AsyncRequest> request(const Resource&, Callback) override;
 
+    // For testing only.
+    void setOnlineStatus(bool);
+
 private:
     friend class OnlineFileRequest;
 
diff --git a/platform/default/default_file_source.cpp b/platform/default/default_file_source.cpp
index b9d35ae4ed..1e855dd9f7 100644
--- a/platform/default/default_file_source.cpp
+++ b/platform/default/default_file_source.cpp
@@ -177,6 +177,10 @@ public:
         offlineDatabase->setOfflineMapboxTileCountLimit(limit);
     }
 
+    void setOnlineStatus(const bool status) {
+        onlineFileSource.setOnlineStatus(status);
+    }
+
     void put(const Resource& resource, const Response& response) {
         offlineDatabase->put(resource, response);
     }
@@ -303,6 +307,10 @@ void DefaultFileSource::resume() {
 
 // For testing only:
 
+void DefaultFileSource::setOnlineStatus(const bool status) {
+    impl->actor().invoke(&Impl::setOnlineStatus, status);
+}
+
 void DefaultFileSource::put(const Resource& resource, const Response& response) {
     impl->actor().invoke(&Impl::put, resource, response);
 }
diff --git a/platform/default/online_file_source.cpp b/platform/default/online_file_source.cpp
index 1c594f87a0..d685109b95 100644
--- a/platform/default/online_file_source.cpp
+++ b/platform/default/online_file_source.cpp
@@ -117,13 +117,24 @@ public:
     }
 
     void activateRequest(OnlineFileRequest* request) {
-        activeRequests.insert(request);
-        request->request = httpFileSource.request(request->resource, [=] (Response response) {
+        auto callback = [=](Response response) {
             activeRequests.erase(request);
-            activatePendingRequest();
             request->request.reset();
             request->completed(response);
-        });
+            activatePendingRequest();
+        };
+
+        activeRequests.insert(request);
+
+        if (online) {
+            request->request = httpFileSource.request(request->resource, callback);
+        } else {
+            Response response;
+            response.error = std::make_unique<Response::Error>(Response::Error::Reason::Connection,
+                                                               "Online connectivity is disabled.");
+            callback(response);
+        }
+
         assert(pendingRequestsMap.size() == pendingRequestsList.size());
     }
 
@@ -153,6 +164,11 @@ public:
         resourceTransform = std::move(transform);
     }
 
+    void setOnlineStatus(const bool status) {
+        online = status;
+        networkIsReachableAgain();
+    }
+
 private:
     void networkIsReachableAgain() {
         for (auto& request : allRequests) {
@@ -178,6 +194,7 @@ private:
     std::unordered_map<OnlineFileRequest*, std::list<OnlineFileRequest*>::iterator> pendingRequestsMap;
     std::unordered_set<OnlineFileRequest*> activeRequests;
 
+    bool online = true;
     HTTPFileSource httpFileSource;
     util::AsyncTask reachability { std::bind(&Impl::networkIsReachableAgain, this) };
 };
@@ -389,4 +406,10 @@ ActorRef<OnlineFileRequest> OnlineFileRequest::actor() {
     return ActorRef<OnlineFileRequest>(*this, mailbox);
 }
 
+// For testing only:
+
+void OnlineFileSource::setOnlineStatus(const bool status) {
+    impl->setOnlineStatus(status);
+}
+
 } // namespace mbgl