Merge common/ and selfdrive/common (#24556)

* Merge common/ and selfdrive/common

* fix that

* fix version

* fix unit tests
old-commit-hash: cb8885cffb313bea258c012c3026461a22bf8135

common/statlog.cc

@@ -0,0 +1,46 @@
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include "common/statlog.h"
+#include "common/util.h"
+
+#include <stdio.h>
+#include <mutex>
+#include <zmq.h>
+
+class StatlogState : public LogState {
+  public:
+    StatlogState() : LogState("ipc:///tmp/stats") {}
+};
+
+static StatlogState s = {};
+
+static void log(const char* metric_type, const char* metric, const char* fmt, ...) {
+  std::lock_guard lk(s.lock);
+  if (!s.initialized) s.initialize();
+
+  char* value_buf = nullptr;
+  va_list args;
+  va_start(args, fmt);
+  int ret = vasprintf(&value_buf, fmt, args);
+  va_end(args);
+
+  if (ret > 0 && value_buf) {
+    char* line_buf = nullptr;
+    ret = asprintf(&line_buf, "%s:%s|%s", metric, value_buf, metric_type);
+    if (ret > 0 && line_buf) {
+      zmq_send(s.sock, line_buf, ret, ZMQ_NOBLOCK);
+      free(line_buf);
+    }
+    free(value_buf);
+  }
+}
+
+void statlog_log(const char* metric_type, const char* metric, int value) {
+  log(metric_type, metric, "%d", value);
+}
+
+void statlog_log(const char* metric_type, const char* metric, float value) {
+  log(metric_type, metric, "%f", value);
+}