feat(outputs_http): implement support for compressed upload

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

falco.yaml

@@ -566,6 +566,7 @@ http_output:
   client_key: "/etc/ssl/certs/client.key"
   # Whether to echo server answers to stdout
   echo: false
+  compress_uploads: false
 
 # [Stable] `program_output`
 #

userspace/falco/configuration.cpp

@@ -309,6 +309,10 @@ void falco_configuration::load_yaml(const std::string& config_name, const yaml_h
 		client_key = config.get_scalar<std::string>("http_output.client_key", "/etc/ssl/certs/client.key");
 		http_output.options["client_key"] = client_key;
 
+		bool compress_uploads;
+		compress_uploads = config.get_scalar<bool>("http_output.compress_uploads", false);
+		http_output.options["compress_uploads"] = compress_uploads? std::string("true") : std::string("false");
+
 		m_outputs.push_back(http_output);
 	}
 

userspace/falco/outputs_http.cpp

@@ -97,6 +97,11 @@ bool falco::outputs::output_http::init(const config& oc, bool buffered, const st
 		CHECK_RES(curl_easy_setopt(m_curl, CURLOPT_WRITEFUNCTION, noop_write_callback));
 	}
 
+	if(m_oc.options["compress_uploads"] == std::string("true"))
+	{
+		CHECK_RES(curl_easy_setopt(m_curl, CURLOPT_TRANSFER_ENCODING, 1L));
+	}
+
 	if(res != CURLE_OK)
 	{
 		err = "libcurl error: " + std::string(curl_easy_strerror(res));