Update the FixtureLog

Now the FixtureLog is an Log::Observer instead of a backend. The
observer can sniff and filter log messages, that can be used
for fail a test if it emits a warning for example.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/mbgl/platform/log.cpp b/src/mbgl/platform/log.cpp
index 4bbff8da5d..e9712f727c 100644
--- a/src/mbgl/platform/log.cpp
+++ b/src/mbgl/platform/log.cpp
@@ -4,6 +4,16 @@
 
 namespace mbgl {
 
+namespace {
+
+static std::unique_ptr<Log::Observer> currentObserver;
+
+}
+
+void Log::setObserver(std::unique_ptr<Observer> observer) {
+    currentObserver = std::move(observer);
+}
+
 void Log::record(EventSeverity severity, Event event, const std::string &msg) {
     record(severity, event, -1, msg);
 }
@@ -23,6 +33,10 @@ void Log::record(EventSeverity severity, Event event, int64_t code) {
 }
 
 void Log::record(EventSeverity severity, Event event, int64_t code, const std::string &msg) {
+    if (currentObserver && currentObserver->onRecord(severity, event, code, msg)) {
+        return;
+    }
+
     platformRecord(severity, event, code, msg);
 }