From ac61191e89a4a439495c6c035499b073d727dc0e Mon Sep 17 00:00:00 2001
From: arshiam2 <arshiam2@illinois.edu>
Date: Sat, 1 Dec 2018 13:56:14 -0600
Subject: [PATCH] everything

---
 README.md                        |   63 +-
 cli/.gitignore                   |    4 +
 cli/package-lock.json            | 3681 ++++++++++++++++++++++++++++++
 cli/package.json                 |   36 +
 cli/src/commands/delete.js       |   26 +
 cli/src/commands/get-versions.js |   28 +
 cli/src/commands/get.js          |   48 +
 cli/src/commands/join.js         |   23 +
 cli/src/commands/leave.js        |   20 +
 cli/src/commands/list.js         |   34 +
 cli/src/commands/ls.js           |   26 +
 cli/src/commands/put.js          |   38 +
 cli/src/commands/store.js        |   26 +
 cli/src/index.js                 |    9 +
 cli/src/utils/getMaster.js       |   36 +
 cli/src/utils/handleErrors.js    |   11 +
 sfds/.gitignore                  |    2 +
 sfds/index.js                    |  494 ++++
 sfds/package-lock.json           |  235 ++
 sfds/package.json                |   19 +
 sfds/yarn.lock                   |  391 ++++
 21 files changed, 5249 insertions(+), 1 deletion(-)
 create mode 100644 cli/.gitignore
 create mode 100644 cli/package-lock.json
 create mode 100644 cli/package.json
 create mode 100644 cli/src/commands/delete.js
 create mode 100644 cli/src/commands/get-versions.js
 create mode 100644 cli/src/commands/get.js
 create mode 100644 cli/src/commands/join.js
 create mode 100644 cli/src/commands/leave.js
 create mode 100644 cli/src/commands/list.js
 create mode 100644 cli/src/commands/ls.js
 create mode 100644 cli/src/commands/put.js
 create mode 100644 cli/src/commands/store.js
 create mode 100644 cli/src/index.js
 create mode 100644 cli/src/utils/getMaster.js
 create mode 100644 cli/src/utils/handleErrors.js
 create mode 100644 sfds/.gitignore
 create mode 100644 sfds/index.js
 create mode 100644 sfds/package-lock.json
 create mode 100644 sfds/package.json
 create mode 100644 sfds/yarn.lock

diff --git a/README.md b/README.md
index cdeca4e..a229e94 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,63 @@
-# cs425-mp4
+# CS 425 Membership
+
+## Prerequisites
+Have node and npm installed on each VM and clone the repo in each one. 
+
+## Cli Tool
+
+The cli tool has a couple commands that allows it to interact with the introducers and machines to tell it to join, leave, or list that machine's membership lists.
+
+To set it up, run the following commands 
+```
+cd cli
+npm install
+npm run build
+npm link
+```
+
+This links the ```mem``` command to your command line, so you can run all the commands below
+
+```mem -h``` Explains all the commands availible
+
+```mem join <VM_number>``` Adds the specified VM to the group. 
+
+```mem leave <VM_number>``` Voluntarily removal of the specified VM from group. 
+
+```mem list <VM_number>``` Lists the membership list local the specified VM.
+
+```mem put <localfilename> <sdfsfilename>``` Writes localfilename to the SDFS as sdfsfilename.
+
+```mem get <sdfsfilename> <localfilename>``` Reads sdfsfilename from the SDFS to localfilename.
+
+```mem delete <sdfsfilename>``` Removes sdfsfilename and all it’s versions from the SDFS.
+
+```mem ls <sdfsfilename>``` Lists all the VMs that currently store sdfsfilename.
+
+```mem store <VM_number>``` List all SDFS files stored at specified VM. 
+
+```mem get-versions <sdfsfilename> <numversions> <localfilename>``` Writes the names of the latest numversions of sdfsfilename to a localfilename.
+
+
+## SDFS
+
+
+To set it up, run the following commands 
+```
+cd sfds
+npm install
+npm run start
+```
+
+We designed it so that the CLI tool interacts with the VMs using a REST API in which it sends and receives relevant information. Any time it reads, writes, or deletes files, it streams it over websockets. 
+
+Each one of the VM’s interacts checks the status of the other VM’s using the SWIM protocol, in which each of the machines is sending syn-ack messages to the same set of 4 machines consistently. If it doesn’t receive any “acks” for a set period of time, it tells the master that node has died, and then all the metadata is update and resend to all the nodes. Since all the nodes already have all the data, this makes master reelection easy since it can just pick any node that is alive. If a machine dies or leaves, it looks at where all the files are store and replicates appropriately. This metadata includes what files have been uploaded, which VMs have what files, what versions exist of each file, the machines up, and who the master is. This CLI tool just pings the machines in order, and the first one it sees up is elected to master. 
+
+In addition, we generated log files for when a file is written to a machine, downloaded by the user, and deleted. It also logs updates to metadata during replication or when machines leave, die, or join. This allows us to check that it maintains total order between events. We used our code from MP1 to help us debug functionality through the use of these log files. We used our code from MP1 to help us debug functionality through the use of these log files. 
+
+
+# Getting logs 
+
+In the introducer and machine, instead of running ```npm run start``` as the last command, run ```npm run start > log.txt``` which will write all the output to  a file. Otherwise, if it is open, you can the logs printed out to temrinal. 
+
+
 
diff --git a/cli/.gitignore b/cli/.gitignore
new file mode 100644
index 0000000..d8d58e1
--- /dev/null
+++ b/cli/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+.DS_Store
+dist/
+lib/
\ No newline at end of file
diff --git a/cli/package-lock.json b/cli/package-lock.json
new file mode 100644
index 0000000..d6ed113
--- /dev/null
+++ b/cli/package-lock.json
@@ -0,0 +1,3681 @@
+{
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+      }
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+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "requires": {
+        "isexe": "2.0.0"
+      }
+    },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "requires": {
+        "string-width": "1.0.2",
+        "strip-ansi": "3.0.1"
+      },
+      "dependencies": {
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "requires": {
+            "number-is-nan": "1.0.1"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "requires": {
+            "code-point-at": "1.1.0",
+            "is-fullwidth-code-point": "1.0.0",
+            "strip-ansi": "3.0.1"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "requires": {
+            "ansi-regex": "2.1.1"
+          }
+        }
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "0.5.1"
+      }
+    },
+    "ws": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.1.0.tgz",
+      "integrity": "sha512-H3dGVdGvW2H8bnYpIDc3u3LH8Wue3Qh+Zto6aXXFzvESkTVT6rAfKR6tR/+coaUvxs8yHtmNV0uioBF62ZGSTg==",
+      "requires": {
+        "async-limiter": "1.0.0"
+      }
+    },
+    "ws-await": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ws-await/-/ws-await-2.0.0.tgz",
+      "integrity": "sha512-+5eTWqbtbaQ7Syc2WP+Myf06riRhmWtoNkJAUkr9bmquAyHl0HLWRxkyTWPeJx2Afyddc9/qlvCTik9YJSuQgQ==",
+      "requires": {
+        "ws": "6.1.0"
+      }
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
+    },
+    "yargs": {
+      "version": "11.1.0",
+      "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+      "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
+      "requires": {
+        "cliui": "4.1.0",
+        "decamelize": "1.2.0",
+        "find-up": "2.1.0",
+        "get-caller-file": "1.0.3",
+        "os-locale": "2.1.0",
+        "require-directory": "2.1.1",
+        "require-main-filename": "1.0.1",
+        "set-blocking": "2.0.0",
+        "string-width": "2.1.1",
+        "which-module": "2.0.0",
+        "y18n": "3.2.1",
+        "yargs-parser": "9.0.2"
+      }
+    },
+    "yargs-parser": {
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
+      "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
+      "requires": {
+        "camelcase": "4.1.0"
+      }
+    }
+  }
+}
diff --git a/cli/package.json b/cli/package.json
new file mode 100644
index 0000000..4409272
--- /dev/null
+++ b/cli/package.json
@@ -0,0 +1,36 @@
+{
+  "name": "mem",
+  "version": "1.0.0",
+  "description": "CLI tools to do everything mechmania (upload a new script to server, queue games, update your local package, etc.)",
+  "main": "index.js",
+  "license": "MIT",
+  "scripts": {
+    "build": "flow-remove-types src/ --out-dir lib && pkg . --out-path dist/"
+  },
+  "bin": "lib/index.js",
+  "pkg": {
+    "targets": [
+      "node8-macos",
+      "node8-linux",
+      "node8-win"
+    ]
+  },
+  "dependencies": {
+    "dgram": "^1.0.1",
+    "express": "^4.16.4",
+    "form-data": "^2.3.3",
+    "fs": "0.0.1-security",
+    "net": "^1.0.2",
+    "node-fetch": "^2.2.0",
+    "util": "^0.11.1",
+    "ws": "^6.1.0",
+    "ws-await": "^2.0.0",
+    "yargs": "^11.0.0"
+  },
+  "devDependencies": {
+    "eslint": "^4.18.0",
+    "flow-bin": "^0.66.0",
+    "flow-remove-types": "^1.2.3",
+    "pkg": "^4.3.0"
+  }
+}
diff --git a/cli/src/commands/delete.js b/cli/src/commands/delete.js
new file mode 100644
index 0000000..4136213
--- /dev/null
+++ b/cli/src/commands/delete.js
@@ -0,0 +1,26 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const fs = require("fs");
+const util = require("util");
+const net = require("net");
+const process = require("process");
+var request = require("request");
+
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+module.exports.command = "delete [sdfsfilename]";
+module.exports.describe =
+  "Removes sdfsfilename and all it’s versions from the SDFS.";
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  master = await getMaster()
+  var target =
+    "http://" +
+    master +
+    ":3000/delete/" +
+    argv.sdfsfilename;
+  request.post(target);
+});
diff --git a/cli/src/commands/get-versions.js b/cli/src/commands/get-versions.js
new file mode 100644
index 0000000..5ba8fa7
--- /dev/null
+++ b/cli/src/commands/get-versions.js
@@ -0,0 +1,28 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const fs = require("fs");
+const util = require("util");
+const net = require("net");
+const process = require("process");
+var request = require("request");
+
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+module.exports.command = "get-versions [sdfsfilename] [numversions] [localfilename]";
+module.exports.describe = "Writes the names of the latest numversions of sdfsfilename to a localfilename.";
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  const master = await getMaster()
+  var target = "http://"+ master + ":3000/getVersions/" + argv.sdfsfilename + "/" + argv.numversions;
+  request.post(target, function(error, response, body) {
+        fs.writeFile(argv.localfilename, body.toString(), function(err) {
+            if (err) console.log(err)
+            console.log("Written to " + process.cwd() + "/" + argv.localfilename)
+            process.exit(0)
+        });
+        // process.exit(0)
+    })
+});
diff --git a/cli/src/commands/get.js b/cli/src/commands/get.js
new file mode 100644
index 0000000..c544688
--- /dev/null
+++ b/cli/src/commands/get.js
@@ -0,0 +1,48 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const fs = require("fs");
+const util = require("util");
+const net = require("net");
+const process = require("process");
+var express = require("express");
+var http = require("http");
+var request = require("request");
+
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+
+var app = express();
+
+app.post("/upload/:filename/", function(req, res) {
+    // console.log("GETTING THIS")
+    var filename = path.basename(req.params.filename);
+    filename = path.resolve(process.cwd() + "/", filename);
+  
+    var dst = fs.createWriteStream(filename);
+    req.pipe(dst);
+    dst.on("drain", function() {
+      console.log("drain", new Date());
+      req.resume();
+    });
+    req.on("end", function() {
+      res.sendStatus(200);
+      process.exit(0);
+    });
+});
+
+module.exports.command = "get [sdfsfilename] [localfilename]";
+module.exports.describe = "Reads sdfsfilename from the SDFS to localfilename.";
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  http.createServer(app).listen(3000, "172.16.244.74", function() {
+    console.log("Express server listening on port 3000");
+  });
+
+  const master = await getMaster()
+
+  var target = "http://"+master+":3000/get/" + argv.sdfsfilename +  "/" + argv.localfilename;
+  var ws = request.post(target);
+});
diff --git a/cli/src/commands/join.js b/cli/src/commands/join.js
new file mode 100644
index 0000000..db2a08b
--- /dev/null
+++ b/cli/src/commands/join.js
@@ -0,0 +1,23 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const process = require("process");
+var request = require("request");
+let fetch = require("node-fetch");
+
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+module.exports.command = "join [number]";
+module.exports.describe = "dds the specified VM to the group.";
+
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  const master = await getMaster();
+  var target = "http://" + master + ":3000/join/" + argv.number;
+  request.post(target, function(error, response, body) {
+    process.exit(0);
+  });
+
+});
diff --git a/cli/src/commands/leave.js b/cli/src/commands/leave.js
new file mode 100644
index 0000000..c5ee6b2
--- /dev/null
+++ b/cli/src/commands/leave.js
@@ -0,0 +1,20 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const process = require("process");
+const request = require("request");
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+module.exports.command = "leave [number]";
+module.exports.describe = "Voluntarily removal of the specified VM from group.";
+
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  const master = await getMaster();
+  var target = "http://" + master + ":3000/leave/" + argv.number;
+  request.post(target, function(error, response, body) {
+    process.exit(0);
+  });
+});
diff --git a/cli/src/commands/list.js b/cli/src/commands/list.js
new file mode 100644
index 0000000..d0581ca
--- /dev/null
+++ b/cli/src/commands/list.js
@@ -0,0 +1,34 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const process = require("process");
+var request = require("request");
+let fetch = require("node-fetch");
+
+const handleErrors = require("../utils/handleErrors");
+
+module.exports.command = "list [number]";
+module.exports.describe = "Lists the membership list local the specified VM.";
+
+module.exports.builder = (yargs: any) => yargs;
+
+const machineToIps = {
+  "1": "172.22.156.15",
+  "2": "172.22.158.15",
+  "3": "172.22.154.16",
+  "4": "172.22.156.16",
+  "5": "172.22.158.16",
+  "6": "172.22.154.17",
+  "8": "172.22.158.17",
+  "9": "172.22.154.18",
+  "10": "172.22.156.18"
+};
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  var target = "http://" + machineToIps[argv.number] +":3000/list/" + argv.number;
+  console.log(target)
+  request.post(target, function(error, response, body) {
+        console.log(body)
+        process.exit(0)
+    })
+});
diff --git a/cli/src/commands/ls.js b/cli/src/commands/ls.js
new file mode 100644
index 0000000..01b7ee6
--- /dev/null
+++ b/cli/src/commands/ls.js
@@ -0,0 +1,26 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const fs = require("fs");
+const util = require("util");
+const net = require("net");
+const process = require("process");
+var request = require("request");
+let fetch = require("node-fetch");
+
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+module.exports.command = "ls [sdfsfilename]";
+module.exports.describe =
+  "Lists all the VMs that currently store sdfsfilename.";
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  const master = await getMaster();
+  var target = "http://" + master + ":3000/ls/" + argv.sdfsfilename;
+  request.post(target, function(error, response, body) {
+    console.log('The file "' + argv.sdfsfilename + '" is on VMs ' + body);
+    process.exit(0);
+  });
+});
diff --git a/cli/src/commands/put.js b/cli/src/commands/put.js
new file mode 100644
index 0000000..2a37756
--- /dev/null
+++ b/cli/src/commands/put.js
@@ -0,0 +1,38 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const fs = require("fs");
+const util = require("util");
+const net = require("net");
+const process = require("process");
+var request = require("request");
+
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+module.exports.command = "put [localfilename] [sdfsfilename]";
+module.exports.describe = "Writes localfilename to the SDFS as sdfsfilename.";
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  const master = await getMaster()
+  var target = "http://"+ master + ":3000/upload/" + argv.sdfsfilename;
+  var rs = fs.createReadStream(argv.localfilename);
+  var ws = request.post(target);
+
+  ws.on("drain", function() {
+    console.log("drain", new Date());
+    rs.resume();
+  });
+
+  rs.on("end", function() {
+    console.log("Uploaded " + argv.localfilename + " as " + argv.sdfsfilename);
+    process.exit(0);
+  });
+
+  ws.on("error", function(err) {
+    console.error("cannot send file to " + target + ": " + err);
+  });
+
+  rs.pipe(ws);
+});
diff --git a/cli/src/commands/store.js b/cli/src/commands/store.js
new file mode 100644
index 0000000..b4c0e03
--- /dev/null
+++ b/cli/src/commands/store.js
@@ -0,0 +1,26 @@
+// @flow
+const path = require("path");
+const chalk = require("chalk");
+const fs = require("fs");
+const util = require("util");
+const net = require("net");
+const process = require("process");
+var request = require("request");
+
+const handleErrors = require("../utils/handleErrors");
+const getMaster = require("../utils/getMaster");
+
+module.exports.command = "store [vmNumber]";
+module.exports.describe = " List all SDFS files stored at specified VM.";
+module.exports.builder = (yargs: any) => yargs;
+
+module.exports.handler = handleErrors(async (argv: {}) => {
+  const master = await getMaster();
+  var target = "http://" + master + ":3000/store/" + argv.vmNumber;
+  console.log(target)
+  request.post(target, function(error, response, body) {
+        console.log("\nThe files on VM  "+ argv.vmNumber + " include " + body);
+        process.exit(0)
+    })
+    
+});
diff --git a/cli/src/index.js b/cli/src/index.js
new file mode 100644
index 0000000..1cd206b
--- /dev/null
+++ b/cli/src/index.js
@@ -0,0 +1,9 @@
+#!/usr/bin/env node
+//@flow
+const yargs = require('yargs');
+
+const argv = yargs
+  .commandDir('./commands')
+  .help('help')
+  .alias('h', 'help')
+  .argv;
\ No newline at end of file
diff --git a/cli/src/utils/getMaster.js b/cli/src/utils/getMaster.js
new file mode 100644
index 0000000..6185a4d
--- /dev/null
+++ b/cli/src/utils/getMaster.js
@@ -0,0 +1,36 @@
+let fetch = require("node-fetch")
+
+const machineToIps = {
+    "1": "172.22.156.15",
+    "2": "172.22.158.15",
+    "3": "172.22.154.16",
+    "4": "172.22.156.16",
+    "5": "172.22.158.16",
+    "6": "172.22.154.17",
+    "8": "172.22.158.17",
+    "9": "172.22.154.18",
+    "10": "172.22.156.18"
+  };
+
+module.exports = async function getMaster() {
+    machinesUp = [];
+    const machines = Object.keys(machineToIps);
+    await Promise.all(
+      machines.map(async machine => {
+        var url = "http://" + machineToIps[machine] + ":3000/master/";
+        try {
+          let response = await fetch(url);
+          let parsed = await response.text();
+          if (parsed === "Alive") {
+            machinesUp.push(Number(machine));
+          }
+        } catch (e) {}
+      })
+    );
+    master = 0;
+    if (machinesUp.length > 0) {
+      master = Math.min(...machinesUp);
+    }
+    console.log("Master is " + master)
+    return machineToIps[String(master)]
+  }
\ No newline at end of file
diff --git a/cli/src/utils/handleErrors.js b/cli/src/utils/handleErrors.js
new file mode 100644
index 0000000..b506b21
--- /dev/null
+++ b/cli/src/utils/handleErrors.js
@@ -0,0 +1,11 @@
+
+// @flow
+
+module.exports = (handler: any => any) => async (...args: [any]) => {
+    try {
+      return await handler(...args)
+    } catch (e) {
+      console.trace(e);
+      process.exit(1);
+    }
+  }
\ No newline at end of file
diff --git a/sfds/.gitignore b/sfds/.gitignore
new file mode 100644
index 0000000..28f1ba7
--- /dev/null
+++ b/sfds/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+.DS_Store
\ No newline at end of file
diff --git a/sfds/index.js b/sfds/index.js
new file mode 100644
index 0000000..9d2c78b
--- /dev/null
+++ b/sfds/index.js
@@ -0,0 +1,494 @@
+var express = require("express");
+var http = require("http");
+var path = require("path");
+var fs = require("fs");
+var request = require("request");
+var app = express();
+const process = require("process");
+var bodyParser = require("body-parser");
+const dgram = require("dgram");
+
+var jsonParser = bodyParser.json();
+
+const machineToIps = {
+  "0": "192.17.151.88",
+  "1": "172.22.156.15",
+  "2": "172.22.158.15",
+  "3": "172.22.154.16",
+  "4": "172.22.156.16",
+  "5": "172.22.158.16",
+  "6": "172.22.154.17",
+  "8": "172.22.158.17",
+  "9": "172.22.154.18",
+  "10": "172.22.156.18"
+};
+
+let master = 1;
+
+let files = {};
+
+let clients = [1];
+
+let versions = {};
+
+// Helper functions
+
+function uploadToVM(VMNumber, localFileName, fileName, upload_status) {
+  console.log("Sending file to " + VMNumber);
+  var target =
+    "http://" +
+    machineToIps[String(VMNumber)] +
+    ":3000/" +
+    upload_status +
+    "/" +
+    fileName;
+  // console.log(localFileName)
+  var rs = fs.createReadStream(localFileName);
+  var ws = request.post(target);
+
+  ws.on("drain", function() {
+    rs.resume();
+  });
+
+  ws.on("error", function(err) {
+    console.error("Cannot send file to VM " + String(VMNumber) + ": " + err);
+    for (let x = 0; x < clients.length; x++) {
+      if (!files[fileName].includes(clients[x])) {
+        files[fileName] = files[fileName].filter(e => e !== VMNumber);
+        files[fileName].push(clients[x]);
+        uploadToVM(clients[x], localFileName, fileName, "reupload");
+        break;
+      }
+    }
+  });
+
+  rs.pipe(ws);
+}
+
+function update() {
+  clients_with_timestamps = {};
+  clients.forEach(client => {
+    if (client != undefined) {
+      clients_with_timestamps[client] = new Date().getTime();
+    }
+  });
+  master = Math.min(...clients);
+  clients.filter(e => e !== master).forEach(client => {
+    var postData = {
+      data: "update",
+      files,
+      clients,
+      versions
+    };
+    let url = "http://" + machineToIps[String(client)] + ":3000/update/";
+    var options = {
+      method: "POST",
+      body: postData,
+      json: true,
+      url: url
+    };
+    request(options, function optionalCallback(err, httpResponse, body) {});
+  });
+}
+
+// API endpoints
+
+app.post("/reupload/:filename", function(req, res) {
+  console.log("Writting the file to VM " + process.env.VM);
+  var filename = path.basename(req.params.filename);
+  filename = path.resolve(__dirname, "files/" + filename);
+  var dst = fs.createWriteStream(filename);
+  req.pipe(dst);
+  dst.on("drain", function() {
+    req.resume();
+  });
+});
+
+app.post("/upload/:filename", function(req, res) {
+  console.log("\nPutting " + req.params.filename);
+  if (String(master) === String(process.env.VM)) {
+    var filename = path.basename(req.params.filename);
+    var fname = String(filename);
+
+    if (fname in versions) {
+      var count = versions[fname].length + 1;
+      var name = String(fname) + String(count);
+      versions[fname].push(name);
+    } else {
+      versions[fname] = [];
+      var name = String(fname) + "1";
+      versions[fname].push(name);
+    }
+
+    const numberOfFiles = Object.keys(files).length;
+    const numberOfClients = clients.length;
+
+    files[name] = [
+      clients[(numberOfFiles + 0) % numberOfClients],
+      clients[(numberOfFiles + 1) % numberOfClients],
+      clients[(numberOfFiles + 2) % numberOfClients],
+      clients[(numberOfFiles + 3) % numberOfClients]
+    ];
+
+    files[name] = [...new Set(files[name])];
+
+    update()
+
+    if (files[name].indexOf(Number(process.env.VM)) >= 0) {
+      console.log("Writting the file to VM " + process.env.VM);
+    }
+
+    console.log(files);
+
+    filename = path.resolve(__dirname, "files/" + name);
+
+    var dst = fs.createWriteStream(filename);
+    req.pipe(dst);
+    dst.on("drain", function() {
+      req.resume();
+    });
+    req.on("close", function() {
+      for (let k = 0; k < files[name].length; k++) {
+        if (String(files[name][k]) !== String(process.env.VM)) {
+          uploadToVM(files[name][k], filename, name, "upload");
+        }
+      }
+      res.sendStatus(200);
+    });
+  } else {
+    console.log("Writting the file to VM " + process.env.VM);
+    var filename = path.basename(req.params.filename);
+    filename = path.resolve(__dirname, "files/" + filename);
+    var dst = fs.createWriteStream(filename);
+    req.pipe(dst);
+    dst.on("drain", function() {
+      req.resume();
+    });
+  }
+});
+
+app.post("/get/:sdfsfilename/:localfilename", function(req, res) {
+  console.log("\nGetting " + req.params.sdfsfilename);
+  var list = versions[String(req.params.sdfsfilename)];
+  var latestVersion = String(list[list.length - 1]);
+  console.log(latestVersion);
+
+  if (String(master) === String(process.env.VM)) {
+    if (
+      files[latestVersion].indexOf(Number(process.env.VM)) >= 0 ||
+      files[latestVersion].length == 0
+    ) {
+      var target =
+        "http://" +
+        "172.16.244.74" +
+        ":3000/upload/" +
+        req.params.localfilename;
+
+      if (!fs.existsSync(process.cwd() + "/files/" + latestVersion)) {
+        res.status(404).send("File does not exist");
+      } else {
+        console.log("Fetching from VM " + String(process.env.VM));
+        var rs = fs.createReadStream("files/" + latestVersion);
+        var ws = request.post(target);
+
+        ws.on("drain", function() {
+          rs.resume();
+        });
+
+        rs.on("end", function() {
+          console.log("Downloaded to user");
+          res.sendStatus(200);
+        });
+
+        ws.on("error", function(err) {
+          console.error("Cannot send file to " + target + ": " + err);
+        });
+
+        rs.pipe(ws);
+      }
+    } else {
+      console.log("Fetching from VM " + String(files[latestVersion][0]));
+
+      var target =
+        "http://" +
+        machineToIps[String(files[latestVersion][0])] +
+        ":3000/get/" +
+        req.params.sdfsfilename +
+        "/" +
+        req.params.localfilename;
+      var ws = request.post(target);
+    }
+  } else {
+    var target = "http://172.16.244.74:3000/upload/" + req.params.localfilename;
+
+    if (!fs.existsSync(process.cwd() + "/files/" + latestVersion)) {
+      res.status(404).send("File does not exist");
+    } else {
+      var rs = fs.createReadStream("files/" + latestVersion);
+      var ws = request.post(target);
+
+      ws.on("drain", function() {
+        rs.resume();
+      });
+
+      rs.on("end", function() {
+        console.log("Downloaded to user");
+        res.sendStatus(200);
+      });
+
+      ws.on("error", function(err) {
+        console.error("Cannot send file to " + target + ": " + err);
+      });
+
+      rs.pipe(ws);
+    }
+  }
+});
+
+app.post("/delete/:sdfsfilename", function(req, res) {
+  console.log("\nDeleting " + req.params.sdfsfilename);
+  for (
+    var i = 0, size = versions[String(req.params.sdfsfilename)].length;
+    i < size + 1;
+    i++
+  ) {
+    var item = versions[String(req.params.sdfsfilename)][i];
+    delete files[item];
+  }
+  delete versions[String(req.params.sdfsfilename)];
+  console.log(files);
+});
+
+app.post("/ls/:sdfsfilename", function(req, res) {
+  console.log('The file "' + req.params.sdfsfilename + '" is on VMs: ');
+  var arr = [];
+  if (String(req.params.sdfsfilename) in versions) {
+    for (var i = 0; i < versions[String(req.params.sdfsfilename)].length; i++) {
+      var item = versions[String(req.params.sdfsfilename)][i];
+      const fileWithVms =  "\n" + item + ": " + files[item].join(", ");
+      arr.push(fileWithVms);
+    }
+  }
+  arr = [...new Set(arr)];
+  res.send(arr.join(", "));
+});
+
+app.post("/update/", jsonParser, function(req, res) {
+  if (req.body.data === "master") {
+    clients.filter(e => e !== master).forEach(client => {
+      console.log(client);
+      let url = "http://" + machineToIps[String(client)] + ":3000/update/";
+      console.log(url);
+
+      var postData = {
+        data: "update",
+        files,
+        clients,
+        versions
+      };
+
+      var options = {
+        method: "POST",
+        body: postData,
+        json: true,
+        url: url
+      };
+      console.log(options);
+      request(options, function optionalCallback(err, httpResponse, body) {
+        if (err) {
+          return console.error("upload failed:", err);
+        }
+        console.log("Updated " + client);
+      });
+    });
+  } else {
+    files = req.body.files;
+    versions = req.body.versions;
+    if (clients != req.body.clients) {
+      console.log("Updating clients " + req.body.clients);
+      clients = req.body.clients;
+      clients_with_timestamps = {};
+      clients.forEach(client => {
+        clients_with_timestamps[client] = new Date().getTime();
+      });
+    }
+  }
+});
+
+app.post("/store/:VMNumber", function(req, res) {
+  filesOnVM = [];
+  Object.keys(files).forEach(file => {
+    if (files[file].includes(Number(req.params.VMNumber))) {
+      filesOnVM.push(file);
+    }
+  });
+
+  console.log(
+    "\nThe files on VM  " +
+      req.params.VMNumber +
+      " include " +
+      filesOnVM.join(", ")
+  );
+  res.send(filesOnVM.join(", "));
+});
+
+app.post("/getVersions/:sdfsfilename/:numversions", function(req, res) {
+  let count = Number(req.params.numversions);
+  res.send(
+    versions[String(req.params.sdfsfilename)]
+      .reverse()
+      .slice(0, count)
+      .join(", ")
+  );
+});
+
+app.post("/join/:number", function(req, res) {
+  clients.push(Number(req.params.number));
+  clients = [...new Set(clients)];
+  console.log("Current set of clients " + clients.join(", "));
+  update();
+  res.send(clients.join(", "));
+});
+
+app.post("/leave/:number", function(req, res) {
+  clients = clients.filter(e => e !== Number(req.params.number));
+  update();
+
+  Object.keys(files).forEach(file => {
+    for (let k = 0; k < clients.length; k++) {
+      console.log(clients[k]);
+      if (files[file].indexOf(clients[k]) < 0) {
+        console.log("Rereplicating to VM " + clients[k]);
+        files[file].push(clients[k])
+        files[file] = files[file].filter(f => f !== Number(req.params.number) )
+        uploadToVM(
+          clients[k],
+          process.cwd() + "/files/" + file,
+          file,
+          "upload"
+        );
+        break;
+      }
+    }
+  });
+  update();
+
+  res.send(clients.join(", "));
+});
+
+app.post("/list/:number", function(req, res) {
+  res.send(clients.join(", "));
+});
+
+app.get("/master", function(req, res) {
+  res.send("Alive");
+});
+
+http.createServer(app).listen(3000, machineToIps[process.env.VM], function() {
+  console.log("Express server listening on port 3000");
+});
+
+// SWIM protocol to catch failures
+
+const socket = dgram.createSocket({ type: "udp4", reuseAddr: true });
+socket.bind(20000);
+
+clients_with_timestamps = {
+};
+
+socket.on("listening", function() {
+  const address = socket.address();
+  console.log(
+    `VM ${process.env.VM} UDP socket listening on ${
+      machineToIps[String(process.env.VM)]
+    }:${address.port} pid: ${process.pid}`
+  );
+});
+
+function sendMessage(host, message) {
+  socket.send(message, 0, message.length, 20000, host, function() {});
+}
+
+socket.on("message", function(message, rinfo) {
+  if (message.toString().startsWith("ack")) {
+    clients_with_timestamps[
+      message.toString().substr(4)
+    ] = new Date().getTime();
+  } else if (message.toString().startsWith("syn")) {
+    sendMessage(
+      machineToIps[message.toString().substr(4)],
+      Buffer.from(`ack ` + process.env.VM)
+    );
+  }
+});
+
+setInterval(function sync() {
+  const startIndex = process.env.VM
+  let VMsToPing = [
+    clients[
+      Number((startIndex + 0) % clients.length)
+    ],
+    clients[
+      Number((startIndex + 1) % clients.length)
+    ],
+    clients[
+      Number((startIndex + 2) % clients.length)
+    ],
+    clients[
+      Number((startIndex + 3) % clients.length)
+    ]
+  ];
+  VMsToPing = [...new Set(VMsToPing)];
+  VMsToPing = VMsToPing.filter(e => e !== process.env.VM);
+  VMsToPing.forEach(vm => {
+    sendMessage(machineToIps[vm], Buffer.from(`syn ` + process.env.VM));
+  });
+}, 500);
+
+setInterval(function sync() {
+
+  const startIndex = process.env.VM;
+  let VMsToPing = [
+    clients[
+      Number((startIndex + 0) % clients.length)
+    ],
+    clients[
+      Number((startIndex + 1) % clients.length)
+    ],
+    clients[
+      Number((startIndex + 2) % clients.length)
+    ],
+    clients[
+      Number((startIndex + 3) %clients.length)
+    ]
+  ];
+  VMsToPing = [...new Set(VMsToPing)];
+  VMsToPing = VMsToPing.filter(e => e !== process.env.VM);
+  console.log("pinging " + VMsToPing)
+
+  VMsToPing.forEach(client => {
+    if (
+      clients_with_timestamps[client] !== 0 &&
+      clients_with_timestamps[client] !== -1 &&
+      new Date().getTime() - clients_with_timestamps[client] > 5000 &&
+      client != process.env.VM
+    ) {
+      console.log(client + " is dead");
+      clients = clients.filter(e => e !== Number(client));
+      console.log("Clients left alive include " + clients.join(", "));
+      update();
+      Object.keys(files).forEach(file => {
+        for (let k = 0; k < clients.length; k++) {
+          if (files[file].indexOf(clients[k]) < 0) {
+            console.log("Rereplicating to VM " + clients[k]);
+            files[file].push(clients[k])
+            files[file] = files[file].filter(f => f !== Number(client) )
+            uploadToVM(clients[k], "files/" + file, "files/" +  file, "reupload");
+            update();
+            break;
+          }
+        }
+      });
+    }
+  });
+}, 5000);
diff --git a/sfds/package-lock.json b/sfds/package-lock.json
new file mode 100644
index 0000000..529126d
--- /dev/null
+++ b/sfds/package-lock.json
@@ -0,0 +1,235 @@
+{
+  "name": "test-2",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "body-parser": {
+      "version": "1.18.3",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
+      "integrity": "sha1-WykhmP/dVTs6DyDe0FkrlWlVyLQ=",
+      "requires": {
+        "bytes": "3.0.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "~1.6.3",
+        "iconv-lite": "0.4.23",
+        "on-finished": "~2.3.0",
+        "qs": "6.5.2",
+        "raw-body": "2.3.3",
+        "type-is": "~1.6.16"
+      }
+    },
+    "bytes": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
+      "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg="
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
+    },
+    "debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "depd": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
+    },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
+    },
+    "ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
+    },
+    "encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
+    },
+    "escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
+    },
+    "etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
+    },
+    "fresh": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
+      "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
+    },
+    "fs": {
+      "version": "0.0.1-security",
+      "resolved": "https://registry.npmjs.org/fs/-/fs-0.0.1-security.tgz",
+      "integrity": "sha1-invTcYa23d84E/I4WLV+yq9eQdQ="
+    },
+    "http-errors": {
+      "version": "1.6.3",
+      "resolved": "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+      "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
+      "requires": {
+        "depd": "~1.1.2",
+        "inherits": "2.0.3",
+        "setprototypeof": "1.1.0",
+        "statuses": ">= 1.4.0 < 2"
+      }
+    },
+    "iconv-lite": {
+      "version": "0.4.23",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.23.tgz",
+      "integrity": "sha512-neyTUVFtahjf0mB3dZT77u+8O0QB89jFdnBkd5P1JgYPbPaia3gXXOVL2fq8VyU2gMMD7SaN7QukTB/pmXYvDA==",
+      "requires": {
+        "safer-buffer": ">= 2.1.2 < 3"
+      }
+    },
+    "inherits": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
+    },
+    "media-typer": {
+      "version": "0.3.0",
+      "resolved": "http://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
+      "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
+    },
+    "mime": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-1.4.1.tgz",
+      "integrity": "sha512-KI1+qOZu5DcW6wayYHSzR/tXKCDC5Om4s1z2QJjDULzLcmf3DvzS7oluY4HCTrc+9FiKmWUgeNLg7W3uIQvxtQ=="
+    },
+    "mime-db": {
+      "version": "1.37.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.37.0.tgz",
+      "integrity": "sha512-R3C4db6bgQhlIhPU48fUtdVmKnflq+hRdad7IyKhtFj06VPNVdk2RhiYL3UjQIlso8L+YxAtFkobT0VK+S/ybg=="
+    },
+    "mime-types": {
+      "version": "2.1.21",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.21.tgz",
+      "integrity": "sha512-3iL6DbwpyLzjR3xHSFNFeb9Nz/M8WDkX33t1GFQnFOllWk8pOrh/LSrB5OXlnlW5P9LH73X6loW/eogc+F5lJg==",
+      "requires": {
+        "mime-db": "~1.37.0"
+      }
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+    },
+    "on-finished": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
+      "integrity": "sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=",
+      "requires": {
+        "ee-first": "1.1.1"
+      }
+    },
+    "path": {
+      "version": "0.12.7",
+      "resolved": "https://registry.npmjs.org/path/-/path-0.12.7.tgz",
+      "integrity": "sha1-1NwqUGxM4hl+tIHr/NWzbAFAsQ8=",
+      "requires": {
+        "process": "^0.11.1",
+        "util": "^0.10.3"
+      }
+    },
+    "process": {
+      "version": "0.11.10",
+      "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
+      "integrity": "sha1-czIwDoQBYb2j5podHZGn1LwW8YI="
+    },
+    "qs": {
+      "version": "6.5.2",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
+      "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA=="
+    },
+    "range-parser": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.0.tgz",
+      "integrity": "sha1-9JvmtIeJTdxA3MlKMi9hEJLgDV4="
+    },
+    "raw-body": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.3.3.tgz",
+      "integrity": "sha512-9esiElv1BrZoI3rCDuOuKCBRbuApGGaDPQfjSflGxdy4oyzqghxu6klEkkVIvBje+FF0BX9coEv8KqW6X/7njw==",
+      "requires": {
+        "bytes": "3.0.0",
+        "http-errors": "1.6.3",
+        "iconv-lite": "0.4.23",
+        "unpipe": "1.0.0"
+      }
+    },
+    "safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
+    },
+    "send": {
+      "version": "0.16.2",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.16.2.tgz",
+      "integrity": "sha512-E64YFPUssFHEFBvpbbjr44NCLtI1AohxQ8ZSiJjQLskAdKuriYEP6VyGEsRDH8ScozGpkaX1BGvhanqCwkcEZw==",
+      "requires": {
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "destroy": "~1.0.4",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "~1.6.2",
+        "mime": "1.4.1",
+        "ms": "2.0.0",
+        "on-finished": "~2.3.0",
+        "range-parser": "~1.2.0",
+        "statuses": "~1.4.0"
+      }
+    },
+    "setprototypeof": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
+      "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ=="
+    },
+    "statuses": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
+      "integrity": "sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew=="
+    },
+    "type-is": {
+      "version": "1.6.16",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
+      "integrity": "sha512-HRkVv/5qY2G6I8iab9cI7v1bOIdhm94dVjQCPFElW9W+3GeDOSHmy2EBYe4VTApuzolPcmgFTN3ftVJRKR2J9Q==",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.18"
+      }
+    },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
+    },
+    "util": {
+      "version": "0.10.4",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.10.4.tgz",
+      "integrity": "sha512-0Pm9hTQ3se5ll1XihRic3FDIku70C+iHUdT/W926rSgHV5QgXsYbKZN8MSC3tJtSkhuROzvsQjAaFENRXr+19A==",
+      "requires": {
+        "inherits": "2.0.3"
+      }
+    }
+  }
+}
diff --git a/sfds/package.json b/sfds/package.json
new file mode 100644
index 0000000..979792c
--- /dev/null
+++ b/sfds/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "test-2",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js $VM"
+  },
+  "author": "Aria <arshiam2828@gmail.com>",
+  "license": "MIT",
+  "dependencies": {
+    "body-parser": "^1.18.3",
+    "fs": "^0.0.1-security",
+    "node-fetch": "^2.2.0",
+    "path": "^0.12.7",
+    "request": "^2.88.0",
+    "send": "^0.16.2"
+  }
+}
diff --git a/sfds/yarn.lock b/sfds/yarn.lock
new file mode 100644
index 0000000..9157505
--- /dev/null
+++ b/sfds/yarn.lock
@@ -0,0 +1,391 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+ajv@^5.3.0:
+  version "5.5.2"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-5.5.2.tgz#73b5eeca3fab653e3d3f9422b341ad42205dc965"
+  dependencies:
+    co "^4.6.0"
+    fast-deep-equal "^1.0.0"
+    fast-json-stable-stringify "^2.0.0"
+    json-schema-traverse "^0.3.0"
+
+asn1@~0.2.3:
+  version "0.2.4"
+  resolved "https://registry.yarnpkg.com/asn1/-/asn1-0.2.4.tgz#8d2475dfab553bb33e77b54e59e880bb8ce23136"
+  dependencies:
+    safer-buffer "~2.1.0"
+
+assert-plus@1.0.0, assert-plus@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/assert-plus/-/assert-plus-1.0.0.tgz#f12e0f3c5d77b0b1cdd9146942e4e96c1e4dd525"
+
+asynckit@^0.4.0:
+  version "0.4.0"
+  resolved "https://registry.yarnpkg.com/asynckit/-/asynckit-0.4.0.tgz#c79ed97f7f34cb8f2ba1bc9790bcc366474b4b79"
+
+aws-sign2@~0.7.0:
+  version "0.7.0"
+  resolved "https://registry.yarnpkg.com/aws-sign2/-/aws-sign2-0.7.0.tgz#b46e890934a9591f2d2f6f86d7e6a9f1b3fe76a8"
+
+aws4@^1.8.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.8.0.tgz#f0e003d9ca9e7f59c7a508945d7b2ef9a04a542f"
+
+bcrypt-pbkdf@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz#a4301d389b6a43f9b67ff3ca11a3f6637e360e9e"
+  dependencies:
+    tweetnacl "^0.14.3"
+
+caseless@~0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
+
+co@^4.6.0:
+  version "4.6.0"
+  resolved "https://registry.yarnpkg.com/co/-/co-4.6.0.tgz#6ea6bdf3d853ae54ccb8e47bfa0bf3f9031fb184"
+
+combined-stream@^1.0.6, combined-stream@~1.0.6:
+  version "1.0.7"
+  resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.7.tgz#2d1d24317afb8abe95d6d2c0b07b57813539d828"
+  dependencies:
+    delayed-stream "~1.0.0"
+
+core-util-is@1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
+
+dashdash@^1.12.0:
+  version "1.14.1"
+  resolved "https://registry.yarnpkg.com/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"
+  dependencies:
+    assert-plus "^1.0.0"
+
+debug@2.6.9:
+  version "2.6.9"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
+  dependencies:
+    ms "2.0.0"
+
+delayed-stream@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
+
+depd@~1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/depd/-/depd-1.1.2.tgz#9bcd52e14c097763e749b274c4346ed2e560b5a9"
+
+destroy@~1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/destroy/-/destroy-1.0.4.tgz#978857442c44749e4206613e37946205826abd80"
+
+ecc-jsbn@~0.1.1:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz#3a83a904e54353287874c564b7549386849a98c9"
+  dependencies:
+    jsbn "~0.1.0"
+    safer-buffer "^2.1.0"
+
+ee-first@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/ee-first/-/ee-first-1.1.1.tgz#590c61156b0ae2f4f0255732a158b266bc56b21d"
+
+encodeurl@~1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/encodeurl/-/encodeurl-1.0.2.tgz#ad3ff4c86ec2d029322f5a02c3a9a606c95b3f59"
+
+escape-html@~1.0.3:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/escape-html/-/escape-html-1.0.3.tgz#0258eae4d3d0c0974de1c169188ef0051d1d1988"
+
+etag@~1.8.1:
+  version "1.8.1"
+  resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
+
+extend@~3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.2.tgz#f8b1136b4071fbd8eb140aff858b1019ec2915fa"
+
+extsprintf@1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.3.0.tgz#96918440e3041a7a414f8c52e3c574eb3c3e1e05"
+
+extsprintf@^1.2.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.4.0.tgz#e2689f8f356fad62cca65a3a91c5df5f9551692f"
+
+fast-deep-equal@^1.0.0:
+  version "1.1.0"
+  resolved "http://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz#c053477817c86b51daa853c81e059b733d023614"
+
+fast-json-stable-stringify@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz#d5142c0caee6b1189f87d3a76111064f86c8bbf2"
+
+forever-agent@~0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/forever-agent/-/forever-agent-0.6.1.tgz#fbc71f0c41adeb37f96c577ad1ed42d8fdacca91"
+
+form-data@~2.3.2:
+  version "2.3.3"
+  resolved "https://registry.yarnpkg.com/form-data/-/form-data-2.3.3.tgz#dcce52c05f644f298c6a7ab936bd724ceffbf3a6"
+  dependencies:
+    asynckit "^0.4.0"
+    combined-stream "^1.0.6"
+    mime-types "^2.1.12"
+
+fresh@0.5.2:
+  version "0.5.2"
+  resolved "https://registry.yarnpkg.com/fresh/-/fresh-0.5.2.tgz#3d8cadd90d976569fa835ab1f8e4b23a105605a7"
+
+fs@^0.0.1-security:
+  version "0.0.1-security"
+  resolved "https://registry.yarnpkg.com/fs/-/fs-0.0.1-security.tgz#8a7bd37186b6dddf3813f23858b57ecaaf5e41d4"
+
+getpass@^0.1.1:
+  version "0.1.7"
+  resolved "https://registry.yarnpkg.com/getpass/-/getpass-0.1.7.tgz#5eff8e3e684d569ae4cb2b1282604e8ba62149fa"
+  dependencies:
+    assert-plus "^1.0.0"
+
+har-schema@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/har-schema/-/har-schema-2.0.0.tgz#a94c2224ebcac04782a0d9035521f24735b7ec92"
+
+har-validator@~5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/har-validator/-/har-validator-5.1.0.tgz#44657f5688a22cfd4b72486e81b3a3fb11742c29"
+  dependencies:
+    ajv "^5.3.0"
+    har-schema "^2.0.0"
+
+http-errors@~1.6.2:
+  version "1.6.3"
+  resolved "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz#8b55680bb4be283a0b5bf4ea2e38580be1d9320d"
+  dependencies:
+    depd "~1.1.2"
+    inherits "2.0.3"
+    setprototypeof "1.1.0"
+    statuses ">= 1.4.0 < 2"
+
+http-signature@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/http-signature/-/http-signature-1.2.0.tgz#9aecd925114772f3d95b65a60abb8f7c18fbace1"
+  dependencies:
+    assert-plus "^1.0.0"
+    jsprim "^1.2.2"
+    sshpk "^1.7.0"
+
+inherits@2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+
+is-typedarray@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-typedarray/-/is-typedarray-1.0.0.tgz#e479c80858df0c1b11ddda6940f96011fcda4a9a"
+
+isstream@~0.1.2:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/isstream/-/isstream-0.1.2.tgz#47e63f7af55afa6f92e1500e690eb8b8529c099a"
+
+jsbn@~0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
+
+json-schema-traverse@^0.3.0:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.3.1.tgz#349a6d44c53a51de89b40805c5d5e59b417d3340"
+
+json-schema@0.2.3:
+  version "0.2.3"
+  resolved "https://registry.yarnpkg.com/json-schema/-/json-schema-0.2.3.tgz#b480c892e59a2f05954ce727bd3f2a4e882f9e13"
+
+json-stringify-safe@~5.0.1:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
+
+jsprim@^1.2.2:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/jsprim/-/jsprim-1.4.1.tgz#313e66bc1e5cc06e438bc1b7499c2e5c56acb6a2"
+  dependencies:
+    assert-plus "1.0.0"
+    extsprintf "1.3.0"
+    json-schema "0.2.3"
+    verror "1.10.0"
+
+mime-db@~1.37.0:
+  version "1.37.0"
+  resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.37.0.tgz#0b6a0ce6fdbe9576e25f1f2d2fde8830dc0ad0d8"
+
+mime-types@^2.1.12, mime-types@~2.1.19:
+  version "2.1.21"
+  resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.21.tgz#28995aa1ecb770742fe6ae7e58f9181c744b3f96"
+  dependencies:
+    mime-db "~1.37.0"
+
+mime@1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/mime/-/mime-1.4.1.tgz#121f9ebc49e3766f311a76e1fa1c8003c4b03aa6"
+
+ms@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
+
+node-fetch@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.2.0.tgz#4ee79bde909262f9775f731e3656d0db55ced5b5"
+
+oauth-sign@~0.9.0:
+  version "0.9.0"
+  resolved "https://registry.yarnpkg.com/oauth-sign/-/oauth-sign-0.9.0.tgz#47a7b016baa68b5fa0ecf3dee08a85c679ac6455"
+
+on-finished@~2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/on-finished/-/on-finished-2.3.0.tgz#20f1336481b083cd75337992a16971aa2d906947"
+  dependencies:
+    ee-first "1.1.1"
+
+path@^0.12.7:
+  version "0.12.7"
+  resolved "https://registry.yarnpkg.com/path/-/path-0.12.7.tgz#d4dc2a506c4ce2197eb481ebfcd5b36c0140b10f"
+  dependencies:
+    process "^0.11.1"
+    util "^0.10.3"
+
+performance-now@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
+
+process@^0.11.1:
+  version "0.11.10"
+  resolved "https://registry.yarnpkg.com/process/-/process-0.11.10.tgz#7332300e840161bda3e69a1d1d91a7d4bc16f182"
+
+psl@^1.1.24:
+  version "1.1.29"
+  resolved "https://registry.yarnpkg.com/psl/-/psl-1.1.29.tgz#60f580d360170bb722a797cc704411e6da850c67"
+
+punycode@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
+
+qs@~6.5.2:
+  version "6.5.2"
+  resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
+
+range-parser@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.0.tgz#f49be6b487894ddc40dcc94a322f611092e00d5e"
+
+request@^2.88.0:
+  version "2.88.0"
+  resolved "https://registry.yarnpkg.com/request/-/request-2.88.0.tgz#9c2fca4f7d35b592efe57c7f0a55e81052124fef"
+  dependencies:
+    aws-sign2 "~0.7.0"
+    aws4 "^1.8.0"
+    caseless "~0.12.0"
+    combined-stream "~1.0.6"
+    extend "~3.0.2"
+    forever-agent "~0.6.1"
+    form-data "~2.3.2"
+    har-validator "~5.1.0"
+    http-signature "~1.2.0"
+    is-typedarray "~1.0.0"
+    isstream "~0.1.2"
+    json-stringify-safe "~5.0.1"
+    mime-types "~2.1.19"
+    oauth-sign "~0.9.0"
+    performance-now "^2.1.0"
+    qs "~6.5.2"
+    safe-buffer "^5.1.2"
+    tough-cookie "~2.4.3"
+    tunnel-agent "^0.6.0"
+    uuid "^3.3.2"
+
+safe-buffer@^5.0.1, safe-buffer@^5.1.2:
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
+
+safer-buffer@^2.0.2, safer-buffer@^2.1.0, safer-buffer@~2.1.0:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
+
+send@^0.16.2:
+  version "0.16.2"
+  resolved "https://registry.yarnpkg.com/send/-/send-0.16.2.tgz#6ecca1e0f8c156d141597559848df64730a6bbc1"
+  dependencies:
+    debug "2.6.9"
+    depd "~1.1.2"
+    destroy "~1.0.4"
+    encodeurl "~1.0.2"
+    escape-html "~1.0.3"
+    etag "~1.8.1"
+    fresh "0.5.2"
+    http-errors "~1.6.2"
+    mime "1.4.1"
+    ms "2.0.0"
+    on-finished "~2.3.0"
+    range-parser "~1.2.0"
+    statuses "~1.4.0"
+
+setprototypeof@1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/setprototypeof/-/setprototypeof-1.1.0.tgz#d0bd85536887b6fe7c0d818cb962d9d91c54e656"
+
+sshpk@^1.7.0:
+  version "1.15.2"
+  resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.15.2.tgz#c946d6bd9b1a39d0e8635763f5242d6ed6dcb629"
+  dependencies:
+    asn1 "~0.2.3"
+    assert-plus "^1.0.0"
+    bcrypt-pbkdf "^1.0.0"
+    dashdash "^1.12.0"
+    ecc-jsbn "~0.1.1"
+    getpass "^0.1.1"
+    jsbn "~0.1.0"
+    safer-buffer "^2.0.2"
+    tweetnacl "~0.14.0"
+
+"statuses@>= 1.4.0 < 2":
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.5.0.tgz#161c7dac177659fd9811f43771fa99381478628c"
+
+statuses@~1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.4.0.tgz#bb73d446da2796106efcc1b601a253d6c46bd087"
+
+tough-cookie@~2.4.3:
+  version "2.4.3"
+  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.4.3.tgz#53f36da3f47783b0925afa06ff9f3b165280f781"
+  dependencies:
+    psl "^1.1.24"
+    punycode "^1.4.1"
+
+tunnel-agent@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/tunnel-agent/-/tunnel-agent-0.6.0.tgz#27a5dea06b36b04a0a9966774b290868f0fc40fd"
+  dependencies:
+    safe-buffer "^5.0.1"
+
+tweetnacl@^0.14.3, tweetnacl@~0.14.0:
+  version "0.14.5"
+  resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
+
+util@^0.10.3:
+  version "0.10.4"
+  resolved "https://registry.yarnpkg.com/util/-/util-0.10.4.tgz#3aa0125bfe668a4672de58857d3ace27ecb76901"
+  dependencies:
+    inherits "2.0.3"
+
+uuid@^3.3.2:
+  version "3.3.2"
+  resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.3.2.tgz#1b4af4955eb3077c501c23872fc6513811587131"
+
+verror@1.10.0:
+  version "1.10.0"
+  resolved "https://registry.yarnpkg.com/verror/-/verror-1.10.0.tgz#3a105ca17053af55d6e270c1f8288682e18da400"
+  dependencies:
+    assert-plus "^1.0.0"
+    core-util-is "1.0.2"
+    extsprintf "^1.2.0"
-- 
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