Handle proxy sends according to which socket is ready to receive data

src/generator.c

@@ -1491,12 +1491,59 @@ out:
 	return ret;
 }
 
+typedef struct cs_msg cs_msg_t;
+
+struct cs_msg {
+	cs_msg_t *next;
+	cs_msg_t *prev;
+	proxy_instance_t *proxy;
+	json_t *val;
+};
+
+/* Sends all messages in the queue ready to be dispatched, leaving those that
+ * fail write select to be handled next pass */
+static void send_json_msgq(gdata_t *gdata, cs_msg_t **csmsgq)
+{
+	cs_msg_t *csmsg, *tmp;
+	int ret;
+
+	DL_FOREACH_SAFE(*csmsgq, csmsg, tmp) {
+		connsock_t *cs = &(csmsg->proxy->cs);
+
+		if ((ret = wait_write_select(cs->fd, 0))) {
+			DL_DELETE(*csmsgq, csmsg);
+			if (ret > 0)
+				ret = send_json_msg(cs, csmsg->val);
+			json_decref(csmsg->val);
+			if (ret < 1) {
+				proxy_instance_t *proxy = csmsg->proxy;
+
+				LOGNOTICE("Proxy %d:%d %s failed to send msg in send_json_msgq, dropping",
+					  proxy->id, proxy->subid, proxy->url);
+				disable_subproxy(gdata, proxy->parent, proxy);
+			}
+			free(csmsg);
+		}
+	}
+}
+
+static void add_json_msgq(cs_msg_t **csmsgq, proxy_instance_t *proxy, json_t **val)
+{
+	cs_msg_t *csmsg = ckalloc(sizeof(cs_msg_t));
+
+	csmsg->val = *val;
+	*val = NULL;
+	csmsg->proxy = proxy;
+	DL_APPEND(*csmsgq, csmsg);
+}
+
 /* For processing and sending shares. proxy refers to parent proxy here */
 static void *proxy_send(void *arg)
 {
 	ckpool_t *ckp = (ckpool_t *)arg;
 	gdata_t *gdata = ckp->data;
 	stratum_msg_t *msg = NULL;
+	cs_msg_t *csmsgq = NULL;
 
 	rename_proc("proxysend");
 
@@ -1508,15 +1555,7 @@ static void *proxy_send(void *arg)
 		int64_t client_id = 0, id;
 		notify_instance_t *ni;
 		json_t *jobid = NULL;
-		bool ret = true;
-		connsock_t *cs;
 		json_t *val;
-		tv_t now;
-		ts_t abs;
-
-		tv_time(&now);
-		tv_to_ts(&abs, &now);
-		abs.tv_sec++;
 
 		if (unlikely(msg)) {
 			json_decref(msg->json_msg);
@@ -1524,15 +1563,24 @@ static void *proxy_send(void *arg)
 		}
 
 		mutex_lock(&gdata->psend_lock);
-		if (!gdata->psends)
+		if (!gdata->psends) {
-			cond_timedwait(&gdata->psend_cond, &gdata->psend_lock, &abs);
+			/* Poll every 10ms */
+			const ts_t polltime = {0, 10000000};
+			ts_t timeout_ts;
+
+			ts_realtime(&timeout_ts);
+			timeraddspec(&timeout_ts, &polltime);
+			cond_timedwait(&gdata->psend_cond, &gdata->psend_lock, &timeout_ts);
+		}
 		msg = gdata->psends;
 		if (likely(msg))
 			DL_DELETE(gdata->psends, msg);
 		mutex_unlock(&gdata->psend_lock);
 
-		if (!msg)
+		if (!msg) {
+			send_json_msgq(gdata, &csmsgq);
 			continue;
+		}
 
 		if (unlikely(!json_get_int(&subid, msg->json_msg, "subproxy"))) {
 			LOGWARNING("Failed to find subproxy in proxy_send msg");
@@ -1572,24 +1620,18 @@ static void *proxy_send(void *arg)
 		if (unlikely(!jobid)) {
 			stratifier_reconnect_client(ckp, client_id);
 			LOGNOTICE("Proxy %d:%s failed to find matching jobid in proxysend",
-				  proxy->id, proxy->url);
+				  subproxy->id, subproxy->url);
 			continue;
 		}
 
-		cs = &subproxy->cs;
+		JSON_CPACK(val, "{s[soooo]soss}", "params", subproxy->auth, jobid,
-		JSON_CPACK(val, "{s[soooo]soss}", "params", proxy->auth, jobid,
 				json_object_dup(msg->json_msg, "nonce2"),
 				json_object_dup(msg->json_msg, "ntime"),
 				json_object_dup(msg->json_msg, "nonce"),
 				"id", json_object_dup(msg->json_msg, "id"),
 				"method", "mining.submit");
-		ret = send_json_msg(cs, val);
+		add_json_msgq(&csmsgq, subproxy, &val);
-		json_decref(val);
+		send_json_msgq(gdata, &csmsgq);
-		if (!ret) {
-			LOGNOTICE("Proxy %d:%d %s failed to send msg in proxy_send, dropping to reconnect",
-				  proxy->id, subid, proxy->url);
-			disable_subproxy(gdata, proxy, subproxy);
-		}
 	}
 	return NULL;
 }