From 7ef0c6dbfefc98b89efbfd058d476cccbd01ccc6 Mon Sep 17 00:00:00 2001
From: alwx <alwxndr@gmail.com>
Date: Thu, 2 Feb 2017 17:48:56 +0300
Subject: [PATCH] Watching for DApp changes

---
 README.md    | 26 +++++++++++++---
 devtools.js  |  2 +-
 index.js     | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 package.json |  3 +-
 4 files changed, 107 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index c127eb4..e7fdebb 100644
--- a/README.md
+++ b/README.md
@@ -7,8 +7,9 @@ Additional tools for DApps developers. These tools allows to speed up the proces
 ## Requirements
 
 1. Geth (https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum);
-2. Node.js
-3. NPM
+2. Node.js;
+3. NPM;
+4. Watchman (https://facebook.github.io/watchman/docs/install.html).
 
 ## Installing standalone
 
@@ -39,7 +40,7 @@ Example:
 
 ### Removing DApp
 
-`./status-dev-cli add-dapp <attach_to> <public_key> <dapp_identity>`
+`./status-dev-cli remove-dapp <attach_to> <public_key> <dapp_identity>`
 
 * `attach_to` — Geth endpoint;
 * `public_key` — Public key of your user (you can find it in your profile);
@@ -49,4 +50,21 @@ Example:
 
 ```
 ./status-dev-cli remove-dapp http://localhost:8545 "0x04..." "dapp-test"
-```
\ No newline at end of file
+```
+
+### Watching for DApp changes and updating it automatically
+
+`./status-dev-cli watch-dapp <attach_to> <public_key> <dapp_identity> <dapp_dir>`
+
+* `attach_to` — Geth endpoint;
+* `public_key` — Public key of your user (you can find it in your profile);
+* `dapp_identity` — `whisper-identity` of your DApp;
+* `dapp_dir` — dir that should be observed.
+
+Example:
+
+```
+./status-dev-cli watch-dapp http://localhost:8545 "0x04..." "dapp-test" ~/Documents/DApps/dapp-test/
+```
+
+
diff --git a/devtools.js b/devtools.js
index 8f0b23f..74db2fe 100644
--- a/devtools.js
+++ b/devtools.js
@@ -27,7 +27,7 @@ var status = {
             "ttl": 2,
             "payload": web3.fromAscii("{:type :debug :action :dapp-changed :args \"" + argsHex + "\"}\n")
         });
-        return "DApp has been removed";
+        return "Notification sent";
     }
 };
 
diff --git a/index.js b/index.js
index 54cc9f8..786f2ba 100644
--- a/index.js
+++ b/index.js
@@ -1,11 +1,14 @@
 #!/usr/bin/env node
 const cli = require("commander")
 const child = require('child_process')
-const pkgJson = require(__dirname + '/package.json');
+const watchman = require('fb-watchman');
 
+const pkgJson = require(__dirname + '/package.json');
 const devtoolsPath = __dirname + '/devtools.js';
 
-var fromAscii = function(str) {
+var client = new watchman.Client();
+
+function fromAscii(str) {
     var hex = "";
     for(var i = 0; i < str.length; i++) {
         var code = str.charCodeAt(i);
@@ -16,6 +19,42 @@ var fromAscii = function(str) {
     return "0x" + hex;
 };
 
+function makeSubscription(client, watch, relativePath, attachTo, publicKey, dapp) {
+    sub = {
+        expression: ["allof", ["match", "*.*"]],
+        fields: ["name"]
+    };
+    if (relativePath) {
+        sub.relative_root = relativePath;
+    }
+
+    client.command(['subscribe', watch, 'dapp-subscription', sub],
+        function (error, resp) {
+            if (error) {
+                console.error('Failed to subscribe: ', error);
+                return;
+            }
+            console.log('Subscription established');
+        }
+    );
+
+    client.on('subscription', function (resp) {
+        if (resp.subscription !== 'dapp-subscription') return;
+
+        resp.files.forEach(function (file) {
+            console.log('File changed: ' + file);
+        });
+
+        child.execSync(
+            "geth --exec '" +
+            "loadScript(\"" + devtoolsPath + "\");" +
+            "status.notifyDAppChanged(\"" + publicKey + "\", \"" + dapp + "\");'" +
+            " " +
+            "attach " + attachTo
+        );
+    });
+}
+
 cli.version(pkgJson.version);
 
 cli.command("add-dapp <attach_to> <public_key> <dapp>")
@@ -32,7 +71,7 @@ cli.command("add-dapp <attach_to> <public_key> <dapp>")
     });
 
 cli.command("remove-dapp <attach_to> <public_key> <dapp_identity>")
-    .description("Adds a DApp to contacts and chats")
+    .description("Removes a debuggable DApp")
     .action(function (attachTo, publicKey, dappIdentity) {
         dapp = fromAscii(JSON.stringify({"whisper-identity": dappIdentity}));
         child.execSync(
@@ -44,6 +83,46 @@ cli.command("remove-dapp <attach_to> <public_key> <dapp_identity>")
         );
     });
 
+cli.command("watch-dapp <attach_to> <public_key> <dapp_identity> <dapp_dir>")
+    .description("Starts watching for DApp changes")
+    .action(function (attachTo, publicKey, dappIdentity, dappDir) {
+        dapp = fromAscii(JSON.stringify({"whisper-identity": dappIdentity}));
+
+        client.capabilityCheck(
+            {optional:[], required:['relative_root']},
+            function (error, resp) {
+                if (error) {
+                    console.log(error);
+                    client.end();
+                    return;
+                }
+
+                client.command(
+                    ['watch-project', dappDir],
+                    function (error, resp) {
+                        if (error) {
+                            console.error('Error initiating watch:', error);
+                            return;
+                        }
+
+                        if ('warning' in resp) {
+                            console.log('Warning: ', resp.warning);
+                        }
+
+                        makeSubscription(
+                            client,
+                            resp.watch,
+                            resp.relative_path,
+                            attachTo,
+                            publicKey,
+                            dapp
+                        );
+                    }
+                );
+            }
+        );
+    });
+
 cli.on("*", function(command) {
     console.error("Unknown command " + command[0] + ". See --help for valid commands")
 });
diff --git a/package.json b/package.json
index 4714abf..d91175d 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   "author": "Status.im",
   "license": "MPL-2.0",
   "dependencies": {
-    "commander": "^2.9.0"
+    "commander": "^2.9.0",
+    "fb-watchman": "^2.0.0"
   }
 }