Export TimeseriesExporter Type String

Summary: This change exports the mapping between the `ExportType` to its string representation. For example `fb303::SUM` to `"sum"`.

Reviewed By: jalopezsilva

Differential Revision: D51224204

fbshipit-source-id: e3be46b3db3fa139275c24c724f23428a7593666

fb303/TimeseriesExporter.cpp

@@ -34,6 +34,11 @@ std::array<const char* const, 5> kTypeString = {{
     "pct",
 }};
 
+/* static */
+std::array<const char* const, 5> TimeseriesExporter::getTypeString() {
+  return kTypeString;
+}
+
 /* static */
 CounterType TimeseriesExporter::getStatValue(
     ExportedStat& stat,
@@ -97,7 +102,7 @@ void TimeseriesExporter::getCounterName(
         "%.*s.%s",
         static_cast<int>(statName.size()),
         statName.data(),
-        kTypeString[type]);
+        TimeseriesExporter::getTypeString()[type]);
   } else {
     // typical name: 'ad_request.rate.600' or 'ad_request_elapsed_time.avg.3600'
     auto durationSecs =
@@ -108,7 +113,7 @@ void TimeseriesExporter::getCounterName(
         "%.*s.%s.%ld",
         static_cast<int>(statName.size()),
         statName.data(),
-        kTypeString[type],
+        TimeseriesExporter::getTypeString()[type],
         static_cast<long>(durationSecs.count()));
   }
 }

fb303/TimeseriesExporter.h

@@ -77,6 +77,8 @@ class TimeseriesExporter {
       ExportType type,
       const int level);
 
+  static std::array<const char* const, 5> getTypeString();
+
  private:
   /*
    * Get the specified export value from the specified timeseries level.