trace_events: add file pattern cli option

Allow the user to specify the filepath for the trace_events log file
using a template string.

PR-URL: https://github.com/nodejs/node/pull/18480
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/tracing/node_trace_writer.h b/src/tracing/node_trace_writer.h
index 5abb3e2a61..9211790777 100644
--- a/src/tracing/node_trace_writer.h
+++ b/src/tracing/node_trace_writer.h
@@ -16,7 +16,8 @@ using v8::platform::tracing::TraceWriter;
 
 class NodeTraceWriter : public TraceWriter {
  public:
-  explicit NodeTraceWriter(uv_loop_t* tracing_loop);
+  explicit NodeTraceWriter(const std::string& log_file_pattern,
+                           uv_loop_t* tracing_loop);
   ~NodeTraceWriter();
 
   void AppendTraceEvent(TraceObject* trace_event) override;
@@ -62,6 +63,7 @@ class NodeTraceWriter : public TraceWriter {
   int highest_request_id_completed_ = 0;
   int total_traces_ = 0;
   int file_num_ = 0;
+  const std::string& log_file_pattern_;
   std::ostringstream stream_;
   TraceWriter* json_trace_writer_ = nullptr;
   bool exited_ = false;