input/curl: move code into class CurlMulti

Move all global variables there, and keep just one global variable:
the pointer to the CurlMulti instance.  Prepares for the next commit.

src/input/CurlInputPlugin.cxx

@@ -179,18 +179,40 @@ struct input_curl {
 };
 
 /**
- * This class monitors all CURL file descriptors.
+ * Manager for the global CURLM object.
  */
-class CurlSockets final : private MultiSocketMonitor {
+class CurlMulti final : private MultiSocketMonitor {
+	CURLM *const multi;
+
 public:
-	CurlSockets(EventLoop &_loop)
+	CurlMulti(EventLoop &_loop, CURLM *_multi);
-		:MultiSocketMonitor(_loop) {}
+
+	~CurlMulti() {
+		curl_multi_cleanup(multi);
+	}
+
+	bool Add(input_curl *c, Error &error);
+	void Remove(input_curl *c);
+
+	/**
+	 * Check for finished HTTP responses.
+	 *
+	 * Runs in the I/O thread.  The caller must not hold locks.
+	 */
+	void ReadInfo();
+
+	/**
+	 * Give control to CURL.
+	 *
+	 * Runs in the I/O thread.  The caller must not hold locks.
+	 */
+	void Perform();
 
 	using MultiSocketMonitor::InvalidateSockets;
 
-private:
 	void UpdateSockets();
 
+private:
 	virtual int PrepareSockets() override;
 	virtual void DispatchSockets() override;
 };
@@ -202,16 +224,17 @@ static struct curl_slist *http_200_aliases;
 static const char *proxy, *proxy_user, *proxy_password;
 static unsigned proxy_port;
 
-static struct {
+static CurlMulti *curl_multi;
-	CURLM *multi;
-
-	CurlSockets *sockets;
-} curl;
 
 static constexpr Domain http_domain("http");
 static constexpr Domain curl_domain("curl");
 static constexpr Domain curlm_domain("curlm");
 
+CurlMulti::CurlMulti(EventLoop &_loop, CURLM *_multi)
+	:MultiSocketMonitor(_loop), multi(_multi)
+{
+}
+
 /**
  * Find a request by its CURL "easy" handle.
  *
@@ -239,7 +262,7 @@ input_curl_resume(struct input_curl *c)
 	if (c->paused) {
 		c->paused = false;
 		curl_easy_pause(c->easy, CURLPAUSE_CONT);
-		curl.sockets->InvalidateSockets();
+		curl_multi->InvalidateSockets();
 	}
 }
 
@@ -279,8 +302,8 @@ input_curl_fd_events(int fd, fd_set *rfds, fd_set *wfds, fd_set *efds)
  *
  * Runs in the I/O thread.  No lock needed.
  */
-void
+inline void
-CurlSockets::UpdateSockets()
+CurlMulti::UpdateSockets()
 {
 	assert(io_thread_inside());
 
@@ -291,7 +314,7 @@ CurlSockets::UpdateSockets()
 	FD_ZERO(&efds);
 
 	int max_fd;
-	CURLMcode mcode = curl_multi_fdset(curl.multi, &rfds, &wfds,
+	CURLMcode mcode = curl_multi_fdset(multi, &rfds, &wfds,
 					   &efds, &max_fd);
 	if (mcode != CURLM_OK) {
 		FormatError(curlm_domain,
@@ -315,14 +338,14 @@ CurlSockets::UpdateSockets()
 /**
  * Runs in the I/O thread.  No lock needed.
  */
-static bool
+inline bool
-input_curl_easy_add(struct input_curl *c, Error &error)
+CurlMulti::Add(struct input_curl *c, Error &error)
 {
 	assert(io_thread_inside());
 	assert(c != nullptr);
 	assert(c->easy != nullptr);
 
-	CURLMcode mcode = curl_multi_add_handle(curl.multi, c->easy);
+	CURLMcode mcode = curl_multi_add_handle(multi, c->easy);
 	if (mcode != CURLM_OK) {
 		error.Format(curlm_domain, mcode,
 			     "curl_multi_add_handle() failed: %s",
@@ -330,7 +353,7 @@ input_curl_easy_add(struct input_curl *c, Error &error)
 		return false;
 	}
 
-	curl.sockets->InvalidateSockets();
+	InvalidateSockets();
 
 	return true;
 }
@@ -347,11 +370,17 @@ input_curl_easy_add_indirect(struct input_curl *c, Error &error)
 
 	bool result;
 	BlockingCall(io_thread_get(), [c, &error, &result](){
-			result = input_curl_easy_add(c, error);
+			result = curl_multi->Add(c, error);
 		});
 	return result;
 }
 
+inline void
+CurlMulti::Remove(input_curl *c)
+{
+	curl_multi_remove_handle(multi, c->easy);
+}
+
 /**
  * Frees the current "libcurl easy" handle, and everything associated
  * with it.
@@ -367,7 +396,8 @@ input_curl_easy_free(struct input_curl *c)
 	if (c->easy == nullptr)
 		return;
 
-	curl_multi_remove_handle(curl.multi, c->easy);
+	curl_multi->Remove(c);
+
 	curl_easy_cleanup(c->easy);
 	c->easy = nullptr;
 
@@ -386,7 +416,7 @@ input_curl_easy_free_indirect(struct input_curl *c)
 {
 	BlockingCall(io_thread_get(), [c](){
 			input_curl_easy_free(c);
-			curl.sockets->InvalidateSockets();
+			curl_multi->InvalidateSockets();
 		});
 
 	assert(c->easy == nullptr);
@@ -439,28 +469,23 @@ input_curl_handle_done(CURL *easy_handle, CURLcode result)
  *
  * Runs in the I/O thread.  The caller must not hold locks.
  */
-static void
+inline void
-input_curl_info_read(void)
+CurlMulti::ReadInfo()
 {
 	assert(io_thread_inside());
 
 	CURLMsg *msg;
 	int msgs_in_queue;
 
-	while ((msg = curl_multi_info_read(curl.multi,
+	while ((msg = curl_multi_info_read(multi,
 					   &msgs_in_queue)) != nullptr) {
 		if (msg->msg == CURLMSG_DONE)
 			input_curl_handle_done(msg->easy_handle, msg->data.result);
 	}
 }
 
-/**
+inline void
- * Give control to CURL.
+CurlMulti::Perform()
- *
- * Runs in the I/O thread.  The caller must not hold locks.
- */
-static void
-input_curl_perform(void)
 {
 	assert(io_thread_inside());
 
@@ -468,7 +493,7 @@ input_curl_perform(void)
 
 	do {
 		int running_handles;
-		mcode = curl_multi_perform(curl.multi, &running_handles);
+		mcode = curl_multi_perform(multi, &running_handles);
 	} while (mcode == CURLM_CALL_MULTI_PERFORM);
 
 	if (mcode != CURLM_OK && mcode != CURLM_CALL_MULTI_PERFORM)
@@ -478,12 +503,12 @@ input_curl_perform(void)
 }
 
 int
-CurlSockets::PrepareSockets()
+CurlMulti::PrepareSockets()
 {
 	UpdateSockets();
 
 	long timeout2;
-	CURLMcode mcode = curl_multi_timeout(curl.multi, &timeout2);
+	CURLMcode mcode = curl_multi_timeout(multi, &timeout2);
 	if (mcode == CURLM_OK) {
 		if (timeout2 >= 0 && timeout2 < 10)
 			/* CURL 7.21.1 likes to report "timeout=0",
@@ -502,10 +527,10 @@ CurlSockets::PrepareSockets()
 }
 
 void
-CurlSockets::DispatchSockets()
+CurlMulti::DispatchSockets()
 {
-	input_curl_perform();
+	Perform();
-	input_curl_info_read();
+	ReadInfo();
 }
 
 /*
@@ -540,13 +565,13 @@ input_curl_init(const config_param &param, Error &error)
 						   "");
 	}
 
-	curl.multi = curl_multi_init();
+	CURLM *multi = curl_multi_init();
-	if (curl.multi == nullptr) {
+	if (multi == nullptr) {
 		error.Set(curl_domain, 0, "curl_multi_init() failed");
 		return false;
 	}
 
-	curl.sockets = new CurlSockets(io_thread_get());
+	curl_multi = new CurlMulti(io_thread_get(), multi);
 
 	return true;
 }
@@ -555,11 +580,9 @@ static void
 input_curl_finish(void)
 {
 	BlockingCall(io_thread_get(), [](){
-			delete curl.sockets;
+			delete curl_multi;
 		});
 
-	curl_multi_cleanup(curl.multi);
-
 	curl_slist_free_all(http_200_aliases);
 
 	curl_global_cleanup();