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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_glean_GleanEvent_h
+#define mozilla_glean_GleanEvent_h
+
+#include "nsIGleanMetrics.h"
+#include "mozilla/glean/bindings/EventGIFFTMap.h"
+#include "mozilla/glean/fog_ffi_generated.h"
+#include "mozilla/ResultVariant.h"
+
+#include "nsString.h"
+#include "nsTArray.h"
+
+namespace mozilla::glean {
+
+// forward declaration
+class GleanEvent;
+
+namespace impl {
+
+/**
+ * Represents the recorded data for a single event
+ */
+struct RecordedEvent {
+ public:
+ uint64_t mTimestamp;
+ nsCString mCategory;
+ nsCString mName;
+
+ nsTArray<std::tuple<nsCString, nsCString>> mExtra;
+};
+
+template <class T>
+class EventMetric {
+ friend class mozilla::glean::GleanEvent;
+
+ public:
+ constexpr explicit EventMetric(uint32_t id) : mId(id) {}
+
+ /**
+ * Record an event.
+ *
+ * @param aExtras The list of (extra key, value) pairs. Allowed extra keys are
+ * defined in the metric definition.
+ * If the wrong keys are used or values are too large
+ * an error is report and no event is recorded.
+ */
+ void Record(const Maybe<T>& aExtras = Nothing()) const {
+ auto id = EventIdForMetric(mId);
+ if (id) {
+ // NB. In case `aExtras` is filled we call `ToFfiExtra`, causing
+ // twice the required allocation. We could be smarter and reuse the data.
+ // But this is GIFFT-only allocation, so wait to be told it's a problem.
+ Maybe<CopyableTArray<Telemetry::EventExtraEntry>> telExtras;
+ if (aExtras) {
+ CopyableTArray<Telemetry::EventExtraEntry> extras;
+ auto serializedExtras = aExtras->ToFfiExtra();
+ auto keys = std::move(std::get<0>(serializedExtras));
+ auto values = std::move(std::get<1>(serializedExtras));
+ for (size_t i = 0; i < keys.Length(); i++) {
+ extras.EmplaceBack(Telemetry::EventExtraEntry{keys[i], values[i]});
+ }
+ telExtras = Some(extras);
+ }
+ Telemetry::RecordEvent(id.extract(), Nothing(), telExtras);
+ }
+ if (aExtras) {
+ auto extra = aExtras->ToFfiExtra();
+ fog_event_record(mId, &std::get<0>(extra), &std::get<1>(extra));
+ } else {
+ nsTArray<nsCString> keys;
+ nsTArray<nsCString> vals;
+ fog_event_record(mId, &keys, &vals);
+ }
+ }
+
+ /**
+ * **Test-only API**
+ *
+ * Get a list of currently stored events for this event metric.
+ *
+ * This function will attempt to await the last parent-process task (if any)
+ * writing to the the metric's storage engine before returning a value.
+ * This function will not wait for data from child processes.
+ *
+ * This doesn't clear the stored value.
+ * Parent process only. Panics in child processes.
+ *
+ * @param aPingName The (optional) name of the ping to retrieve the metric
+ * for. Defaults to the first value in `send_in_pings`.
+ *
+ * @return value of the stored metric, or Nothing() if there is no value.
+ */
+ Result<Maybe<nsTArray<RecordedEvent>>, nsCString> TestGetValue(
+ const nsACString& aPingName = nsCString()) const {
+ nsCString err;
+ if (fog_event_test_get_error(mId, &err)) {
+ return Err(err);
+ }
+
+ if (!fog_event_test_has_value(mId, &aPingName)) {
+ return Maybe<nsTArray<RecordedEvent>>();
+ }
+
+ nsTArray<FfiRecordedEvent> events;
+ fog_event_test_get_value(mId, &aPingName, &events);
+
+ nsTArray<RecordedEvent> result;
+ for (const auto& event : events) {
+ auto ev = result.AppendElement();
+ ev->mTimestamp = event.timestamp;
+ ev->mCategory.Append(event.category);
+ ev->mName.Assign(event.name);
+
+ MOZ_ASSERT(event.extras.Length() % 2 == 0);
+ ev->mExtra.SetCapacity(event.extras.Length() / 2);
+ for (unsigned int i = 0; i < event.extras.Length(); i += 2) {
+ // keys & values are interleaved.
+ nsCString key = std::move(event.extras[i]);
+ nsCString value = std::move(event.extras[i + 1]);
+ ev->mExtra.AppendElement(
+ std::make_tuple(std::move(key), std::move(value)));
+ }
+ }
+ return Some(std::move(result));
+ }
+
+ private:
+ static const nsCString ExtraStringForKey(uint32_t aKey);
+
+ const uint32_t mId;
+};
+
+} // namespace impl
+
+struct NoExtraKeys {
+ std::tuple<nsTArray<nsCString>, nsTArray<nsCString>> ToFfiExtra() const {
+ nsTArray<nsCString> extraKeys;
+ nsTArray<nsCString> extraValues;
+ return std::make_tuple(std::move(extraKeys), std::move(extraValues));
+ }
+};
+
+class GleanEvent final : public nsIGleanEvent {
+ public:
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIGLEANEVENT
+
+ explicit GleanEvent(uint32_t id) : mEvent(id){};
+
+ private:
+ virtual ~GleanEvent() = default;
+
+ const impl::EventMetric<NoExtraKeys> mEvent;
+};
+
+} // namespace mozilla::glean
+
+#endif /* mozilla_glean_GleanEvent.h */