feat(outputs_http): implement keep alive

Signed-off-by: Samuel Gaist <[email protected]>

falco.yaml

@@ -567,6 +567,7 @@ http_output:
   # Whether to echo server answers to stdout
   echo: false
   compress_uploads: false
+  keep_alive: false
 
 # [Stable] `program_output`
 #

userspace/falco/configuration.cpp

@@ -313,6 +313,10 @@ void falco_configuration::load_yaml(const std::string& config_name, const yaml_h
 		compress_uploads = config.get_scalar<bool>("http_output.compress_uploads", false);
 		http_output.options["compress_uploads"] = compress_uploads? std::string("true") : std::string("false");
 
+		bool keep_alive;
+		keep_alive = config.get_scalar<bool>("http_output.keep_alive", false);
+		http_output.options["keep_alive"] = keep_alive? std::string("true") : std::string("false");
+
 		m_outputs.push_back(http_output);
 	}
 

userspace/falco/outputs_http.cpp

@@ -102,6 +102,11 @@ bool falco::outputs::output_http::init(const config& oc, bool buffered, const st
 		CHECK_RES(curl_easy_setopt(m_curl, CURLOPT_TRANSFER_ENCODING, 1L));
 	}
 
+	if(m_oc.options["keep_alive"] == std::string("true"))
+	{
+		CHECK_RES(curl_easy_setopt(m_curl, CURLOPT_TCP_KEEPALIVE, 1L));
+	}
+
 	if(res != CURLE_OK)
 	{
 		err = "libcurl error: " + std::string(curl_easy_strerror(res));