修正suspend/resume语义实现的若干问题，增加自行构建request/response的header标志

common/include/tfe_utils.h

@@ -157,3 +157,4 @@ static inline unsigned char* tfe_hexdump(unsigned char *dst, unsigned char *src,
     return dst;
 }
 
+const char * tfe_version();

platform/src/proxy.cpp

@@ -66,7 +66,7 @@ static __attribute__((__used__)) const char * TFE_VERSION_version_UNKNOWN = NULL
 
 /* VERSION STRING */
 #ifdef TFE_GIT_VERSION
-static __attribute__((__used__)) const char * tfe_version = TFE_GIT_VERSION;
+static __attribute__((__used__)) const char * __tfe_version = TFE_GIT_VERSION;
 #else
 static __attribute__((__used__)) const char * tfe_version = "Unknown";
 #endif
@@ -354,6 +354,12 @@ int main(int argc, char *argv[])
 
 	return 0;
 }
+
+const char * tfe_version()
+{
+	return __tfe_version;
+}
+
 unsigned int tfe_proxy_get_work_thread_count(void)
 {
 	return g_default_proxy->nr_work_threads;

platform/src/tcp_stream.cpp

@@ -141,9 +141,17 @@ void tfe_stream_suspend(const struct tfe_stream * stream, enum tfe_conn_dir by)
 	_stream->is_suspended = true;
 	_stream->suspended_by = by;
 
+	fprintf(stderr, "---- tfe-stream-suspend ----, %p, by = %d\n", _stream, by);
+
 	/* disable all events */
-	bufferevent_disable(_stream->conn_upstream->bev, EV_READ | EV_WRITE);
-	bufferevent_disable(_stream->conn_downstream->bev, EV_READ | EV_WRITE);
+	int ret = 0;
+	ret = bufferevent_disable(_stream->conn_upstream->bev, EV_READ | EV_WRITE);
+	assert(ret == 0);
+
+	ret = bufferevent_disable(_stream->conn_downstream->bev, EV_READ | EV_WRITE);
+	assert(ret == 0);
+
+	(void)ret;
 }
 
 void tfe_stream_resume(const struct tfe_stream * stream)
@@ -154,6 +162,8 @@ void tfe_stream_resume(const struct tfe_stream * stream)
 	bufferevent_enable(_stream->conn_upstream->bev, EV_READ | EV_WRITE);
 	bufferevent_enable(_stream->conn_downstream->bev, EV_READ | EV_WRITE);
 
+	assert(_stream->is_suspended == true);
+	fprintf(stderr, "---- tfe-stream-resume ----, %p\n", _stream);
 	if (_stream->suspended_by == CONN_DIR_DOWNSTREAM)
 	{
 		bufferevent_trigger(_stream->conn_downstream->bev, EV_READ, BEV_OPT_DEFER_CALLBACKS);
@@ -538,6 +548,8 @@ static void __stream_bev_readcb(struct bufferevent * bev, void * arg)
 			break;
 	}
 
+	fprintf(stderr, "----- action = %d,  bev = %p, input bev: %llu\n", action_final, bev, evbuffer_get_length(inbuf));
+
 #if 0
     if (evbuffer_get_length(outbuf) >= TFE_CONFIG_OUTPUT_LIMIT_DEFAULT)
     {
@@ -640,7 +652,6 @@ static void __stream_bev_eventcb(struct bufferevent * bev, short events, void *
 			__stream_bev_readcb(bev, arg);
 		}
 
-//		fprintf(stderr, "---- eventcb ----, stream = %p, event = %x, dir = %s\n", _stream, events, __str_dir);
 		goto __close_connection;
 	}
 
@@ -678,6 +689,7 @@ __close_connection:
 	return;
 
 __call_plugin_close:
+	fprintf(stderr, "---- eventcb ---- call close, stream = %p, event = %x, dir = %s\n", _stream, events, __str_dir);
 	call_plugin_close(_stream);
 	tfe_stream_destory(_stream);
 }

plugin/business/pangu-http/src/pangu_http.cpp

@@ -907,6 +907,7 @@ int make_revalidate_request(const struct tfe_stream * stream, const struct tfe_h
 	if(events & EV_HTTP_REQ_END && ctx->cache_revalidate_req)
 	{
 		ctx->cache_revalidate_req=NULL;
+		return RESUMED_CB_NO_MORE_CALLS;
 	}
 	return RESUMED_CB_MORE_CALLS;
 }
@@ -1001,12 +1002,12 @@ static void cache_pending_on_succ(future_result_t * result, void * user)
 	ctx->f_cache_pending=NULL;
 	if(meta==NULL)
 	{
-		ctx->pending_result==PENDING_RESULT_MISS;
+		ctx->pending_result = PENDING_RESULT_MISS;
 		return;
 	}
 	if(!(meta->etag && meta->last_modified))
 	{
-		ctx->pending_result==PENDING_RESULT_FOBIDDEN;
+		ctx->pending_result = PENDING_RESULT_FOBIDDEN;
 		return;
 	}
 	ctx->pending_result=PENDING_RESULT_REVALIDATE;
@@ -1058,6 +1059,7 @@ void cache_pending(const struct tfe_http_session * session,	unsigned int thread_
 	{
 		case PENDING_RESULT_REVALIDATE:
 			ctx->ref_session=tfe_http_session_allow_write(session);
+			assert(ctx->ref_session != NULL);
 			tfe_http_session_suspend(ctx->ref_session);
 			break;
 		case PENDING_RESULT_ALLOWED:			

plugin/business/pangu-http/src/pangu_web_cache.cpp

@@ -432,7 +432,7 @@ static void cache_query_meta_on_succ(future_result_t * result, void * user)
 	struct cache_pending_context* ctx=(struct cache_pending_context*)promise_get_ctx(p);
 	struct tango_cache_result* _result=tango_cache_read_result(result);
 	ctx->ref_tango_cache_result=_result;
-	time_t cache_last_modified_time=0, request_last_modified_time=0;
+
 	switch(_result->type)
 	{
 		case RESULT_TYPE_HEADER:
@@ -690,9 +690,14 @@ void web_cache_update(struct cache_update_context* ctx, const unsigned char * bo
 }
 void web_cache_update_end(struct cache_update_context* ctx)
 {
+	fprintf(stderr, "------- web_cache_update_end , %p\n", ctx);
+
 	tango_cache_update_end(ctx->write_ctx);
-	free(ctx);
 	ATOMIC_DEC(&(ctx->ref_cache_handle->stat_val[STAT_CACHE_UPLOADING]));
+
+	ctx->write_ctx = NULL;
+	ctx->ref_cache_handle = NULL;
+	free(ctx);
 	return;
 }
 

plugin/protocol/http/include/internal/http_common.h

@@ -41,18 +41,20 @@ struct http_session_private
 	struct http_half_private * hf_private_req_user;
 	/* USER SETUP RESPONSE HALF */
 	struct http_half_private * hf_private_resp_user;
-	/* SUSPEND TAG */
-	bool suspend_tag_user;
 	/* SUSPEND EVENT */
 	tfe_http_event suspend_event;
 	/* SUSPEND TAG EFFECTIVE */
 	bool suspend_tag_effective;
-	/* STREAM WRITE EFFECTIVE */
-	bool stream_write_tag_effective;
 	/* RELEASE LOCK, when the tag is zero, the session can be destroyed */
 	int release_lock;
 	/* thread id */
 	unsigned int thread_id;
+
+	/* SUSPEND COUNTER, ONLY FOR DEBUG AND LOG */
+#ifndef NDEBUG
+	int suspend_counter;
+#endif
+	bool in_gc_queue;
 };
 
 struct http_connection_private

plugin/protocol/http/src/http_entry.cpp

@@ -309,13 +309,19 @@ enum tfe_stream_action __http_connection_entry_on_request(const struct tfe_strea
 	/* The session is suspended, and to resume */
 	if (hs_private->suspend_tag_effective)
 	{
+		enum tfe_http_event __backup_event = hs_private->suspend_event;
+
+		/* Clean up suspend tag, we can support user's call suspend in this callback */
+		hs_private->suspend_event = (enum tfe_http_event) 0;
+		hs_private->suspend_tag_effective = false;
+		hs_private->suspend_counter++;
+
+		/* Call user callback, tell user we resume from suspend */
 		hf_private_req_in->event_cb(hf_private_req_in, hs_private->suspend_event, NULL, 0,
 			hf_private_req_in->event_cb_user);
 
-		hs_private->suspend_event = (enum tfe_http_event) 0;
-		hs_private->suspend_tag_effective = false;
-		hs_private->suspend_tag_user = false;
 
+#if 0
 		if (__on_request_handle_user_req_or_resp(stream, hs_private,
 			hf_private_req_in, __need_to_close_the_session) < 0)
 		{
@@ -333,6 +339,7 @@ enum tfe_stream_action __http_connection_entry_on_request(const struct tfe_strea
 
 		/* Ignore parse the content which is nullptr. */
 		goto __boundary;
+#endif
 	}
 
 	/* Parse the content, the data which in defered state has been ignored. */
@@ -351,13 +358,8 @@ enum tfe_stream_action __http_connection_entry_on_request(const struct tfe_strea
 	}
 
 	/* Suspend */
-	if (hs_private->suspend_tag_user)
+	if (hs_private->suspend_tag_effective)
 	{
-		assert(!hs_private->suspend_tag_effective);
-		hs_private->suspend_tag_effective = true;
-
-		/* Suspend TCP stream */
-		tfe_stream_suspend(stream, CONN_DIR_DOWNSTREAM);
 		return ACTION_DEFER_DATA;
 	}
 

plugin/protocol/http/src/http_half.cpp

@@ -348,7 +348,7 @@ static int __parser_callback_on_headers_complete(http_parser * parser)
 
 	/* user's suspend tag is set, which indicate that the way to handle request/response
 	 * cannot be determinate at now, need to defer */
-	else if (hs_private && hs_private->suspend_tag_user)
+	else if (hs_private && hs_private->suspend_tag_effective)
 	{
 		/* Pause parser, prevent to parse request/response body,
 		 * The body should be parsed after resume() */
@@ -615,9 +615,8 @@ int hf_ops_body_begin(struct tfe_http_half * half, int by_stream)
 		}
 
 		hf_private->content_encoding = HTTP_ACCEPT_ENCODING_NONE;
+		hf_private->message_status = STATUS_READING;
 		hf_private->is_setup_by_stream = true;
-
-		hs_private->stream_write_tag_effective = true;
 		hs_private->release_lock++;
 	}
 
@@ -679,8 +678,7 @@ int hf_ops_body_end(struct tfe_http_half * half)
 
 	if(hf_private->is_setup_by_stream)
 	{
-		hs_private->stream_write_tag_effective = true;
-		hs_private->release_lock++;
+		hs_private->release_lock--;
 	}
 
 	printf("frag write end, stream = %p, hf_private = %p\n", hf_private->session->hc_private->stream, hf_private);
@@ -802,7 +800,7 @@ int hf_private_parse(struct http_half_private * hf_private, const unsigned char
 	 * resume it to normal status */
 	if (__is_paused)
 	{
-		hf_private->parse_cursor += sz_parsed + 1;
+		hf_private->parse_cursor += sz_parsed;
 		return 1;
 	}
 
@@ -829,8 +827,15 @@ void hs_ops_drop(struct tfe_http_session * session)
 void hs_ops_suspend(struct tfe_http_session * session)
 {
 	struct http_session_private * hs_private = to_hs_private(session);
-	hs_private->suspend_tag_user = true;
+	struct http_connection_private * hc_private = hs_private->hc_private;
+
 	hs_private->release_lock++;
+	hs_private->suspend_counter++;
+	hs_private->suspend_tag_effective = true;
+
+	tfe_stream_suspend(hc_private->stream, CONN_DIR_DOWNSTREAM);
+	fprintf(stderr, "---- suspend ----, url = %s, counter = %d\n",
+		hs_private->hs_public.req->req_spec.url, hs_private->suspend_counter);
 }
 
 void hs_ops_resume(struct tfe_http_session * session)
@@ -838,11 +843,18 @@ void hs_ops_resume(struct tfe_http_session * session)
 	struct http_session_private * hs_private = to_hs_private(session);
 	struct http_connection_private * hc_private = hs_private->hc_private;
 
-	hs_private->suspend_tag_user = false;
+	assert(!hs_private->in_gc_queue);
+
 	hs_private->release_lock--;
+	if (hs_private->suspend_tag_effective)
+	{
 		tfe_stream_resume(hc_private->stream);
 	}
 
+	fprintf(stderr, "---- resume ----, url = %s, counter = %d\n",
+		hs_private->hs_public.req->req_spec.url, hs_private->suspend_counter);
+}
+
 // TODO: change the return type to int, there is something happend where -1 returned.
 void hs_ops_request_set(struct tfe_http_session * session, struct tfe_http_half * req_user)
 {
@@ -865,6 +877,8 @@ void hs_ops_request_set(struct tfe_http_session * session, struct tfe_http_half
 
 	assert(hs_private->hf_private_req_user == NULL);
 	hs_private->hf_private_req_user = hf_user_private;
+	hs_private->hf_private_req_user->message_status = STATUS_COMPLETE;
+	hs_private->hf_private_req_user->session = hs_private;
 }
 
 void hs_ops_response_set(struct tfe_http_session * session, struct tfe_http_half * resp)
@@ -897,7 +911,8 @@ void hs_ops_response_set(struct tfe_http_session * session, struct tfe_http_half
 
 	assert(hs_private->hf_private_resp_user == NULL);
 	hs_private->hf_private_resp_user = hf_private;
-	hf_private->session = hs_private;
+	hs_private->hf_private_resp_user->message_status = STATUS_COMPLETE;
+	hs_private->hf_private_resp_user->session = hs_private;
 }
 
 struct tfe_http_half * hs_ops_request_create(struct tfe_http_session * session,
@@ -1042,6 +1057,8 @@ void hf_private_construct(struct http_half_private * hf_private)
 		evbuffer_add_printf(hf_private->evbuf_raw, "%s: %s\r\n", str_field, str_value);
 	}
 
+	/* Trace Tags */
+	evbuffer_add_printf(hf_private->evbuf_raw, "%s: tfe/%s\r\n", "X-TG-Construct-By", tfe_version());
 	/* delimitor between header and body */
 	evbuffer_add_printf(hf_private->evbuf_raw, "\r\n");
 
@@ -1154,8 +1171,20 @@ void hs_private_destroy(struct http_session_private * hs_private)
 
 void hs_private_gc_destroy(struct http_session_private * hs_private, struct hs_private_list * gc_list)
 {
-	if (hs_private->release_lock > 0) TAILQ_INSERT_TAIL(gc_list, hs_private, next);
-	else return hs_private_destroy(hs_private);
+	if (hs_private->release_lock > 0)
+	{
+		TAILQ_INSERT_TAIL(gc_list, hs_private, next);
+		hs_private->in_gc_queue = true;
+	}
+	else
+	{
+		return hs_private_destroy(hs_private);
+	}
+}
+
+bool hs_private_can_destroy(struct http_session_private * hs_private)
+{
+	return hs_private->release_lock <= 0;
 }
 
 void hs_private_hf_private_set(struct http_session_private * hs_private,

plugin/protocol/http/test/test_http_half.cpp

@@ -1488,6 +1488,11 @@ void tfe_stream_resume(const struct tfe_stream * stream)
 	return;
 }
 
+void tfe_stream_suspend(const struct tfe_stream * stream, enum tfe_conn_dir by)
+{
+	return;
+}
+
 int tfe_stream_write_frag(struct tfe_stream_write_ctx * w_ctx, const unsigned char * data, size_t size)
 {
 	return 0;
@@ -1498,6 +1503,11 @@ void tfe_stream_write_frag_end(struct tfe_stream_write_ctx * w_ctx)
 	return;
 }
 
+const char * tfe_version()
+{
+	return NULL;
+}
+
 int main(int argc, char ** argv)
 {
 	::testing::InitGoogleTest(&argc, argv);