chore: namespace observe c api (#164)

* fix: go adapter, apply span tags and memory grow to current span instead of last subspan

* chore: namespace c/c++ observe api

observe-api/c/observe_api.c

@@ -4,21 +4,21 @@
 #include <stdlib.h>
 #include <string.h>
 
-void span_enter(const char *name) {
+void observe_api_span_enter(const char *name) {
   const uint32_t uint32_ptr = (uint32_t)name;
   const uint32_t uint32_length = strlen(name);
   _span_enter(uint32_ptr, uint32_length);
 }
 
-void span_exit(void) { _span_exit(); }
+void observe_api_span_exit(void) { _span_exit(); }
 
-void metric(const char *metric) {
+void observe_api_metric(const char *metric) {
   const uint32_t uint32_ptr = (uint32_t)metric;
   const uint32_t uint32_length = strlen(metric);
   _metric(1, uint32_ptr, uint32_length);
 }
 
-void write_log(const enum DO_LOG_LEVEL level, const char *msg) {
+void observe_api_write_log(const enum DO_LOG_LEVEL level, const char *msg) {
   const uint32_t uint32_ptr = (uint32_t)msg;
   const uint32_t uint32_length = strlen(msg);
   const uint32_t uint32_level = level;

observe-api/c/observe_api.h

@@ -22,9 +22,17 @@ enum DO_LOG_LEVEL {
   DO_LL_TRACE = 4
 };
 
-void span_enter(const char *name);
-void span_exit(void);
-void metric(const char *metric);
-void write_log(const enum DO_LOG_LEVEL level, const char *msg);
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void observe_api_span_enter(const char *name);
+void observe_api_span_exit(void);
+void observe_api_metric(const char *metric);
+void observe_api_write_log(const enum DO_LOG_LEVEL level, const char *msg);
+
+#ifdef __cplusplus
+}
+#endif
 
 #endif

observe-api/test/c/main.c

@@ -3,15 +3,15 @@
 #include <stdlib.h>
 
 void run() {
-  span_enter("printf");
+  observe_api_span_enter("printf");
   printf("Hello from Wasm!\n");
-  span_exit();
+  observe_api_span_exit();
 }
 
 int main(int argc, char *argv[]) {
-  span_enter("run");
+  observe_api_span_enter("run");
   run();
-  span_exit();
+  observe_api_span_exit();
 
   return 0;
 }