gen_wasm_host_api.py is hard to maintain.

[Sn0rt]

the gen_wasm_host_api.py not support geneate the C header file.
this is because of the parameter of the new metric functions type is int64_t so that the script not support it.

and hard to adapt the script.

I want re-implementate the script with python template language which is jinja

diff --git a/src/http/ngx_http_wasm_api_wasmedge.h b/src/http/ngx_http_wasm_api_wasmedge.h
index 151c182..18e2275 100644
--- a/src/http/ngx_http_wasm_api_wasmedge.h
+++ b/src/http/ngx_http_wasm_api_wasmedge.h
@@ -219,6 +219,14 @@ typedef struct {
     int32_t p11 = WasmEdge_ValueGetI32(In[11]); \
     int32_t res = NAME(p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11);

+#define DEFINE_WASM_NAME_ARG_I32_I64 \
+    2, { \
+    WasmEdge_ValType_I32, WasmEdge_ValType_I64, }
+#define DEFINE_WASM_API_ARG_CHECK_I32_I64(NAME) \
+    int32_t p0 = WasmEdge_ValueGetI32(In[0]); \
+    int32_t p1 = WasmEdge_ValueGetI64(In[1]); \
+    int32_t res = NAME(p0, p1);
+
 DEFINE_WASM_API(proxy_set_effective_context,
                 DEFINE_WASM_API_ARG_CHECK_I32_1(proxy_set_effective_context))
 DEFINE_WASM_API(proxy_get_property,
@@ -293,6 +301,14 @@ DEFINE_WASM_API(proxy_done,
                 DEFINE_WASM_API_ARG_CHECK_VOID(proxy_done))
 DEFINE_WASM_API(proxy_call_foreign_function,
                 DEFINE_WASM_API_ARG_CHECK_I32_6(proxy_call_foreign_function))
+DEFINE_WASM_API(proxy_define_metric,
+                DEFINE_WASM_API_ARG_CHECK_I32_4(proxy_define_metric))
+DEFINE_WASM_API(proxy_increment_metric,
+                DEFINE_WASM_API_ARG_CHECK_I32_I64(proxy_increment_metric))
+DEFINE_WASM_API(proxy_record_metric,
+                DEFINE_WASM_API_ARG_CHECK_I32_I64(proxy_record_metric))
+DEFINE_WASM_API(proxy_get_metric,
+                DEFINE_WASM_API_ARG_CHECK_I32_I64(proxy_get_metric))

 static ngx_wasm_wasmedge_host_api_t host_apis[] = {
     DEFINE_WASM_NAME(proxy_set_effective_context, DEFINE_WASM_NAME_ARG_I32_1)
@@ -332,6 +348,10 @@ static ngx_wasm_wasmedge_host_api_t host_apis[] = {
     DEFINE_WASM_NAME(proxy_get_status, DEFINE_WASM_NAME_ARG_I32_3)
     DEFINE_WASM_NAME(proxy_done, DEFINE_WASM_NAME_ARG_VOID)
     DEFINE_WASM_NAME(proxy_call_foreign_function, DEFINE_WASM_NAME_ARG_I32_6)
+    DEFINE_WASM_NAME(proxy_define_metric, DEFINE_WASM_NAME_ARG_I32_4)
+    DEFINE_WASM_NAME(proxy_increment_metric, DEFINE_WASM_NAME_ARG_I32_I64)
+    DEFINE_WASM_NAME(proxy_record_metric, DEFINE_WASM_NAME_ARG_I32_I64)
+    DEFINE_WASM_NAME(proxy_get_metric, DEFINE_WASM_NAME_ARG_I32_I64)
     { ngx_null_string, NULL, 0, {} }
 };

diff --git a/src/http/ngx_http_wasm_api_def.h b/src/http/ngx_http_wasm_api_def.h
index 7a08dd5..f97c02b 100644
--- a/src/http/ngx_http_wasm_api_def.h
+++ b/src/http/ngx_http_wasm_api_def.h
@@ -52,7 +52,8 @@
 #define DEFINE_WASM_API_ARG_I32_12 \
     int32_t, int32_t, int32_t, int32_t, int32_t, int32_t, int32_t, int32_t, \
     int32_t, int32_t, int32_t, int32_t
-
+#define DEFINE_WASM_API_ARG_I32_I64 \
+    int32_t, int64_t

 int32_t proxy_set_effective_context(DEFINE_WASM_API_ARG_I32_1);
 int32_t proxy_get_property(DEFINE_WASM_API_ARG_I32_4);
@@ -91,6 +92,10 @@ int32_t proxy_grpc_close(DEFINE_WASM_API_ARG_I32_1);
 int32_t proxy_get_status(DEFINE_WASM_API_ARG_I32_3);
 int32_t proxy_done(DEFINE_WASM_API_ARG_VOID);
 int32_t proxy_call_foreign_function(DEFINE_WASM_API_ARG_I32_6);
+int32_t proxy_define_metric(DEFINE_WASM_API_ARG_I32_4);
+int32_t proxy_increment_metric(DEFINE_WASM_API_ARG_I32_I64);
+int32_t proxy_record_metric(DEFINE_WASM_API_ARG_I32_I64);
+int32_t proxy_get_metric(DEFINE_WASM_API_ARG_I32_I64);