Desktop: Fixes #1023: Speed up WebDAV and Nextcloud Sync on Linux (#2577)

* Speed up Linux Sync with KeepAlive Client

* Tidying up

* eslint

* Fix Breaking of building mobile client

* Refactor to make building on android possible

* Coding Convention

* Update shim-init-node.js

Co-authored-by: Laurent Cozic <laurent22@users.noreply.github.com>

ReactNativeClient/lib/WebDavApi.js

@@ -6,6 +6,7 @@ const URL = require('url-parse');
 const { rtrimSlashes } = require('lib/path-utils.js');
 const base64 = require('base-64');
 
+
 // Note that the d: namespace (the DAV namespace) is specific to Nextcloud. The RFC for example uses "D:" however
 // we make all the tags and attributes lowercase so we handle both the Nextcloud style and RFC. Hopefully other
 // implementations use the same namespaces. If not, extra processing can be done in `nameProcessor`, for
@@ -31,6 +32,7 @@ class WebDavApi {
 			options.headers = Object.assign({}, options.headers);
 			if (options.headers['Authorization']) options.headers['Authorization'] = '********';
 			delete options.method;
+			delete options.agent;
 			output.push(JSON.stringify(options));
 			return output.join(' ');
 		};
@@ -359,9 +361,11 @@ class WebDavApi {
 		fetchOptions.method = method;
 		if (options.path) fetchOptions.path = options.path;
 		if (body) fetchOptions.body = body;
-
 		const url = `${this.baseUrl()}/${path}`;
 
+		if (shim.httpAgent(url)) fetchOptions.agent = shim.httpAgent(url);
+
+
 		let response = null;
 
 		// console.info('WebDAV Call', `${method} ${url}`, headers, options);

ReactNativeClient/lib/shim-init-node.js

@@ -9,6 +9,8 @@ const Note = require('lib/models/Note.js');
 const Resource = require('lib/models/Resource.js');
 const urlValidator = require('valid-url');
 const { _ } = require('lib/locale.js');
+const http = require('http');
+const https = require('https');
 
 function shimInit() {
 	shim.fsDriver = () => {
@@ -363,6 +365,24 @@ function shimInit() {
 		return bridge().openExternal(url);
 	};
 
+	shim.httpAgent_ = null;
+
+	shim.httpAgent = url => {
+		if (shim.isLinux() && !shim.httpAgent) {
+			var AgentSettings = {
+				keepAlive: true,
+				maxSockets: 1,
+				keepAliveMsecs: 5000,
+			};
+			if (url.startsWith('https')) {
+				shim.httpAgent_ = new https.Agent(AgentSettings);
+			} else {
+				shim.httpAgent_ = new http.Agent(AgentSettings);
+			}
+		}
+		return shim.httpAgent_;
+	};
+
 	shim.openOrCreateFile = (filepath, defaultContents) => {
 		// If the file doesn't exist, create it
 		if (!fs.existsSync(filepath)) {

ReactNativeClient/lib/shim-init-react.js

@@ -132,6 +132,10 @@ function shimInit() {
 		Linking.openURL(url);
 	};
 
+	shim.httpAgent = () => {
+		return null;
+	};
+
 	shim.waitForFrame = () => {
 		return new Promise(function(resolve) {
 			requestAnimationFrame(function() {

ReactNativeClient/lib/shim.js

@@ -190,6 +190,9 @@ shim.Buffer = null;
 shim.openUrl = () => {
 	throw new Error('Not implemented');
 };
+shim.httpAgent = () => {
+	throw new Error('Not implemented');
+};
 shim.openOrCreateFile = () => {
 	throw new Error('Not implemented');
 };