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Write a bunch more glue code

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....but it's all still untested. I'm getting kinda nervous here
This commit is contained in:
Starbeamrainbowlabs 2022-01-08 16:59:08 +00:00
parent 306f3fb29b
commit 135b2e8d1b
Signed by: sbrl
GPG key ID: 1BE5172E637709C2
11 changed files with 274 additions and 19 deletions
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48
package-lock.json generated
View file

@ -15,6 +15,7 @@
"log-node": "^8.0.1",
"nexline": "^1.2.2",
"p-queue": "^7.1.0",
"p-retry": "^5.0.0",
"systeminformation": "^5.9.4",
"tweetnacl": "^1.0.3"
}
@ -24,6 +25,11 @@
"resolved": "https://registry.npmjs.org/@types/crypto-js/-/crypto-js-4.0.2.tgz",
"integrity": "sha512-sCVniU+h3GcGqxOmng11BRvf9TfN9yIs8KKjB8C8d75W69cpTfZG80gau9yTx5SxF3gvHGbJhdESzzvnjtf3Og=="
},
"node_modules/@types/retry": {
"version": "0.12.1",
"resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.1.tgz",
"integrity": "sha512-xoDlM2S4ortawSWORYqsdU+2rxdh4LRW9ytc3zmT37RIKQh6IHyKwwtKhKis9ah8ol07DCkZxPt8BBvPjC6v4g=="
},
"node_modules/ansi-regex": {
"version": "2.1.1",
"resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@ -361,6 +367,21 @@
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/p-retry": {
"version": "5.0.0",
"resolved": "https://registry.npmjs.org/p-retry/-/p-retry-5.0.0.tgz",
"integrity": "sha512-swGFiU6Y1Q3rBikAGHpaT0FHSbiO9H04fSsJRKVtWyEQMAe2Sb1uXeBcqE/RlZqt2prlq4W2HA/+MZAt3V2NkQ==",
"dependencies": {
"@types/retry": "^0.12.1",
"retry": "^0.13.1"
},
"engines": {
"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
},
"funding": {
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/p-timeout": {
"version": "5.0.0",
"resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-5.0.0.tgz",
@ -372,6 +393,14 @@
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/retry": {
"version": "0.13.1",
"resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
"integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg==",
"engines": {
"node": ">= 4"
}
},
"node_modules/safer-buffer": {
"version": "2.1.2",
"resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
@ -457,6 +486,11 @@
"resolved": "https://registry.npmjs.org/@types/crypto-js/-/crypto-js-4.0.2.tgz",
"integrity": "sha512-sCVniU+h3GcGqxOmng11BRvf9TfN9yIs8KKjB8C8d75W69cpTfZG80gau9yTx5SxF3gvHGbJhdESzzvnjtf3Og=="
},
"@types/retry": {
"version": "0.12.1",
"resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.1.tgz",
"integrity": "sha512-xoDlM2S4ortawSWORYqsdU+2rxdh4LRW9ytc3zmT37RIKQh6IHyKwwtKhKis9ah8ol07DCkZxPt8BBvPjC6v4g=="
},
"ansi-regex": {
"version": "2.1.1",
"resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@ -763,11 +797,25 @@
"p-timeout": "^5.0.0"
}
},
"p-retry": {
"version": "5.0.0",
"resolved": "https://registry.npmjs.org/p-retry/-/p-retry-5.0.0.tgz",
"integrity": "sha512-swGFiU6Y1Q3rBikAGHpaT0FHSbiO9H04fSsJRKVtWyEQMAe2Sb1uXeBcqE/RlZqt2prlq4W2HA/+MZAt3V2NkQ==",
"requires": {
"@types/retry": "^0.12.1",
"retry": "^0.13.1"
}
},
"p-timeout": {
"version": "5.0.0",
"resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-5.0.0.tgz",
"integrity": "sha512-z+bU/N7L1SABsqKnQzvAnINgPX7NHdzwUV+gHyJE7VGNDZSr03rhcPODCZSWiiT9k+gf74QPmzcZzqJRvxYZow=="
},
"retry": {
"version": "0.13.1",
"resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
"integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg=="
},
"safer-buffer": {
"version": "2.1.2",
"resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",

1
package.json
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@ -23,6 +23,7 @@
"log-node": "^8.0.1",
"nexline": "^1.2.2",
"p-queue": "^7.1.0",
"p-retry": "^5.0.0",
"systeminformation": "^5.9.4",
"tweetnacl": "^1.0.3"
}

5
src/cli.mjs
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@ -3,10 +3,11 @@
import path from 'path';
import fs from 'fs';
import CliParser from 'applause-cli';
import l from 'log';
import ln from 'log-node'; ln();
import CliParser from 'applause-cli';
import a from './lib/io/Ansi.mjs';
const __dirname = import.meta.url.slice(7, import.meta.url.lastIndexOf("/"));

41
src/lib/agent/Agent.mjs
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@ -1,29 +1,56 @@
"use strict";
import fs from 'fs';
import os from 'os';
import make_cert from 'make-cert';
import log from 'log'; const l = log.get("Agent");
import systeminfo from 'systeminformation';
import PeerServer from './PeerServer.mjs';
import hash from '../crypto/hash.mjs';
import parse_peer_name from '../parse/peer_name.mjs';
class Agent {
constructor() {
constructor(config) {
this.config = config;
}
async init(secret_join) {
this.secret_join = secret_join;
async find_secret() {
if(this.config.secret_join_filepath !== "CHANGE_ME"
&& fs.existsSync(this.config.secret_join_filepath))
return await fs.promises.readFile(this.config.secret_join_filepath, "utf-8");
if(this.config.secret_join !== "CHANGE_ME")
return this.config.secret_join;
return null;
}
async init() {
/** Our peer id - calculated automatically from the system's uuid */
this.peer_id = hash("sha256", "base64", await systeminfo.system().serial)
.replace(/[+/=]/g, "");
this.peer_name = os.hostname();
this.server = new PeerServer(
this.peer_id,
await this.find_secret()
);
this.server.retries = this.config.net.peer_retries;
l.log(`Starting peer listener....`);
await this.server.listen(
this.config.net.port,
this.config.net.bind_address
);
l.log(`Listening on ${this.config.net.bind_address}:${this.config.net.port}`);
// Properties: key, cert
this.cert = make_cert(`${our_id}.systemquery-peer.localhost`);
await this.server.add_peers(...this.config.peers.map(
peer => parse_peer_name(peer)
));
l.log(`Added ${this.config.peers.length} initial peers`);
if(this.config.peers.length < 1)
l.warn(`No initial peers were specified! It's recommended that you specify at least 1 on every host.`);
}
}

14
src/lib/agent/Peer.mjs
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@ -1,6 +1,9 @@
"use strict";
import { EventEmitter, once } from 'events';
import log from 'log'; const l = log.get("Peer");
import Connection from '../transport/Connection.mjs';
class Peer extends EventEmitter {
@ -32,6 +35,11 @@ class Peer extends EventEmitter {
* @type {{address:string,port:number}[]}
*/
this.known_peers = [];
// TODO: Log when disconnected too
this.once("connect", () => {
l.log(`${this.connection.address}:${this.connection.port} connected`);
});
}
///////////////////////////////////////////////////////////////////////////
@ -66,12 +74,16 @@ class Peer extends EventEmitter {
}
async __send_hello() {
await this.connection.send("hello", {
await this.send("hello", {
id: this.server.our_id,
peers: this.server.peers()
});
}
async send(event_name, msg) {
await this.connection.send(event_name, msg);
}
///////////////////////////////////////////////////////////////////////////
async destroy() {

63
src/lib/agent/PeerServer.mjs
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@ -3,6 +3,9 @@
import { EventEmitter, once } from 'events';
import net from 'net';
import p_retry from 'p-retry';
import log from 'log'; const l = l.get("PeerServer");
import Connection from '../transport/Connection.mjs';
import ErrorWrapper from '../core/ErrorWrapper.mjs';
@ -21,6 +24,9 @@ class PeerServer extends EventEmitter {
this.our_id = our_id;
this.secret_join = secret_join;
// The number of retries when attempting to connect to a peer
this.retries = 5;
this.connected_peers = [];
this.connecting_peers = [];
}
@ -56,10 +62,20 @@ class PeerServer extends EventEmitter {
async handle_client(client) {
const peer = await Peer.Accept(this, await Connection.Wrap(this.secret_join, client));
this.peer_initialise(peer);
await once(peer, "connect");
}
/**
* Initialises a CONNECTED peer and registers it as a valid peer.
* This also includesd attaching the necessary event handlers.
* @param {Peer} peer The peer in question.
* @return {void}
*/
peer_initialise(peer) {
this.connected_peers.push(peer);
peer.on("message", this.handle_message.bind(this, peer));
peer.on("destroy", this.handle_destroy.bind(this, peer));
await once(peer, "connect");
}
async handle_message(peer, message) {
@ -72,6 +88,7 @@ class PeerServer extends EventEmitter {
if(index > -1)
this.connected_peers.splice(index, 1);
l.log(`Peer ${peer.address}:${peer.port} disconnected`);
this.emit("disconnect", peer.remote_endpoint);
}
@ -84,6 +101,29 @@ class PeerServer extends EventEmitter {
.filter(el => typeof el.addr === "string" && typeof el.port === "number");
}
/**
* Resolves a Peer id to the respective peer instance.
* @param {string|Peer} peer_id The peer ID to resolve as a string. If a Peer instance is passed instead, this is simply returned unchanged.
* @return {Peer} The Peer instance associated with the given peer id.
*/
peer_resolve(peer_id) {
if(peer_id instanceof Peer) return peer_id;
for (let peer of this.connected_peers) {
if(peer.id === peer_id) return peer;
}
}
/**
* Resolves a list of peer ids (and potentially Peer instances) to a list
* of Peer instances.
* Any Peer instances passed are returned unchanged.
* @param {...string|Peer} peers The peer(s) to resolve.
* @return {Peer[]} A list of Peer instances.
*/
peers_resolve(...peers) {
return peers.map(this.peer_resolve);
}
/**
* Processes a list of peers.
* New connections are established to any peers in the list to which
@ -94,10 +134,14 @@ class PeerServer extends EventEmitter {
* @returns {Promise<Peer[]>} A list of new peers to which we have successfully established a connection.
*/
async add_peers(...new_peers) {
return (await Promise.all(new_peers.map(async new_peer => this.add_peer(
new_peer.address,
new_peer.port
)))).filter(peer => peer instanceof Peer);
// The arrow function here is NOT async because the promise from
// this.add_peer is returned directly to await Promise.all().
return (await Promise.all(new_peers.map(
new_peer => p_retry(async () => await this.add_peer(
new_peer.address,
new_peer.port
), { retries: this.retries })
))).filter(peer => peer instanceof Peer);
}
/**
@ -111,6 +155,7 @@ class PeerServer extends EventEmitter {
* @return {Promise<Peer|null>} A Promise that resolves to the resulting Peer connection, or null if the connection wasn't attemped.
*/
async add_peer(address, port) {
// If we're already connected, don't bother reconnecting again
if(this.peers().some(el => el.address === address && el.port === port))
return;
@ -119,7 +164,7 @@ class PeerServer extends EventEmitter {
let conn;
try {
conn = await Peer.Initiate(this, address, port);
this.connected_peers.push(conn);
peer_initialise(conn);
}
catch(error) {
throw new ErrorWrapper(`Error: Failed to connect to peer.`, error);
@ -140,7 +185,11 @@ class PeerServer extends EventEmitter {
* @return {Promise} A Promise that resolves (or potentially rejects) when the message has been sent.
*/
async send(peer_id, event_name, msg) {
throw new Error(`Not implemented yet`);
if(!(peer_id instanceof Array)) peer_id = [ peer_id ];
await Promise.all(this.peers_resolve(...peer_id).map(
peer => peer.send(event_name, msg)
));
}
/**

9
src/lib/crypto/hash.mjs
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@ -2,8 +2,15 @@
import crypto from 'crypto';
export default function hash(algorithm, encoding, data) {
function hash(algorithm, encoding, data) {
let hasher = crypto.createHash(algorithm);
hasher.update(data);
return hasher.digest(encoding);
}
function sha3hex(data) {
return hash("SHA3-256", "hex", data);
}
export { hash, sha3hex };
export default hash;

55
src/lib/io/TomlSettings.mjs Normal file
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@ -0,0 +1,55 @@
"use strict";
import fs from 'fs';
import TOML from '@ltd/j-toml';
/**
* Reads a pair of TOML configuration files.
* @param {string} file_default The path to the default configuration file.
* @param {string} file_custom The path to the custom configuration file.
* @return {object} The parsed settings object.
*/
function toml_settings_read(file_default, file_custom) {
let obj_default = toml_parse(fs.readFileSync(file_default)),
obj_custom = toml_parse(fs.readFileSync(file_custom));
obj_apply_recursive(obj_custom, obj_default);
return obj_default;
}
/**
* Helper function to parse a given source string of TOML into an object.
* @param {string} source The source string to parse.
* @return {Object} The resulting object.
*/
function toml_parse(source) {
return TOML.parse(
source, // Source string
1.0, // Specification version
"\n", // Multi line joiner
Number.MAX_SAFE_INTEGER // Use big int
);
}
/**
* Merges 2 object trees, overwriting keys in target with those of source.
* Note that target will be mutated!
* @param {object} source The source object to merge.
* @param {object} target The target object to merge.
*/
function obj_apply_recursive(source, target) {
for(let key in source) {
if(typeof source[key] == "object") {
if(typeof target[key] == "undefined")
target[key] = {};
obj_apply_recursive(source[key], target[key]);
continue;
}
target[key] = source[key];
}
}
export default toml_settings_read;

18
src/lib/parse/peer_name.mjs Normal file
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@ -0,0 +1,18 @@
"use strict";
export default function(peer_name) {
let parts = peer_name.split(":", 2);
if(parts.length < 2)
throw new Error(`Error: The peer name '${peer_name}' doesn't seem to contain a colon.`);
let address = parts[0].replace(/^\[|\]$/, "");
let port = parseInt(parts[1]);
if(isNaN(port))
throw new Error(`Error: Failed to parse port number '${parts[1]}' as a port number.`);
return {
address,
port
};
}

17
src/subcommands/agent/agent.mjs
View file

@ -4,7 +4,22 @@ import fs from 'fs';
import path from 'path';
import settings from '../../settings.mjs';
import toml_settings_read from '../../lib/io/TomlSettings.mjs';
import Agent from '../../lib/agent/Agent.mjs';
// HACK: Make sure __dirname is defined when using es6 modules. I forget where I found this - a PR with a source URL would be great :D
const __dirname = import.meta.url.slice(7, import.meta.url.lastIndexOf("/"));
export default async function () {
// Do stuff
if(!fs.existsSync(settings.cli.config))
throw new Error(`Error: The config file at '${settings.cli.config}' doesn't appear to exist, or we don't have permission to access it.`);
let config = toml_settings_read(
path.join(__dirname, "config.default.toml"),
settings.cli.config
);
let agent = new Agent(config);
await agent.init();
}

22
src/subcommands/agent/config.default.toml Normal file
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@ -0,0 +1,22 @@
# The join secret. This HAS to be the same across al nodes in the swarm.
secret_join = "CHANGE_ME"
# Alternatively, specify a path to a file to read the secret from instead.
# secret_join_filepath will be tried first, and if it's set to CHANGE_ME or
# fails for some reason, secret_join is tried second.
secret_join_filepath = "CHANGE_ME"
# A list of 1 or more host:port strings to join initially.
# Note that a complete list of hosts in the swarm is NOT required, as when
# this hosts joins at leaast 1 host in this list it will ask them for the
# location of other members of the swarm.
peers = [ ]
[net]
# Binds to both IPv6 AND IPv4 automatically thanks to the Linux networking stack
bind_address = "::"
# The port to listen on
port = 5252
# The number of retries when connecting to peers.
# Exponential backoff on retries is enforced
peer_retries = 5