[lldb] [llvm] [lldb][telemetry] Implement LLDB Telemetry (part 1) (PR #119716)

[Pavel Labath via llvm-commits]

================
@@ -0,0 +1,95 @@
+
+//===-- Telemetry.cpp -----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "lldb/Core/Telemetry.h"
+
+#include <chrono>
+#include <cstdlib>
+#include <ctime>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "lldb/Core/Debugger.h"
+#include "lldb/Target/Statistics.h"
+#include "lldb/Utility/ConstString.h"
+#include "lldb/Utility/LLDBLog.h"
+#include "lldb/Utility/UUID.h"
+#include "lldb/Version/Version.h"
+#include "lldb/lldb-enumerations.h"
+#include "lldb/lldb-forward.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/RandomNumberGenerator.h"
+#include "llvm/Telemetry/Telemetry.h"
+
+namespace lldb_private {
+
+using ::llvm::Error;
+using ::llvm::telemetry::Destination;
+using ::llvm::telemetry::TelemetryInfo;
+
+static unsigned long long ToNanosec(const SteadyTimePoint Point) {
+  return nanoseconds(Point.value().time_since_epoch()).count();
+}
+
+void LldbBaseTelemetryInfo::serialize(Serializer &serializer) const {
+  serializer.write("entry_kind", getKind());
+  serializer.write("session_id", SessionId);
+  serializer.write("start_time", ToNanosec(stats.start));
+  if (stats.end.has_value())
+    serializer.write("end_time", ToNanosec(stats.end.value()));
+  if (exit_desc.has_value()) {
+    serializer.write("exit_code", exit_desc->exit_code);
+    serializer.write("exit_msg", exit_desc->description);
+  }
+}
+
+static std::string MakeUUID(lldb_private::Debugger *debugger) {
+  std::string ret;
+  uint8_t random_bytes[16];
+  if (auto ec = llvm::getRandomBytes(random_bytes, 16)) {
+    LLDB_LOG(GetLog(LLDBLog::Object),
+             "Failed to generate random bytes for UUID: {0}", ec.message());
+    // fallback to using timestamp + debugger ID.
+    ret = std::to_string(
+              std::chrono::steady_clock::now().time_since_epoch().count()) +
+          "_" + std::to_string(debugger->GetID());
+  } else {
+    ret = lldb_private::UUID(random_bytes).GetAsString();
+  }
+
+  return ret;
+}
+
+TelemetryManager::TelemetryManager(
+    std::unique_ptr<llvm::telemetry::Config> config,
+    lldb_private::Debugger *debugger)
+    : m_config(std::move(config)), m_debugger(debugger),
+      m_session_uuid(MakeUUID(debugger)) {}
+
+llvm::Error TelemetryManager::dispatch(TelemetryInfo *entry) {
+  entry->SessionId = m_session_uuid;
+
+  llvm::Error defferedErrs = llvm::Error::success();
+  for (auto &destination : m_destinations) {
+    if (auto err = destination->receiveEntry(entry))
+      deferredErrs = llvm::joinErrors(std::move(deferredErrs), std::move(err));
----------------
labath wrote:

```suggestion
    deferredErrs = llvm::joinErrors(std::move(deferredErrs), destination->receiveEntry(entry));
```

https://github.com/llvm/llvm-project/pull/119716