Add packet stream parser

.devcontainer/Dockerfile

@@ -32,7 +32,7 @@ RUN apt-get update \
     && curl -sS https://dl.yarnpkg.com/$(lsb_release -is | tr '[:upper:]' '[:lower:]')/pubkey.gpg | apt-key add - 2>/dev/null \
     && echo "deb https://dl.yarnpkg.com/$(lsb_release -is | tr '[:upper:]' '[:lower:]')/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
     && apt-get update \
-    && apt-get -y install --no-install-recommends yarn tmux locales \
+    && apt-get -y install --no-install-recommends yarn tmux locales postgresql \
     #
     # Install eslint globally
     && npm install -g eslint \

.eslintrc

@@ -1,8 +1,18 @@
 {
-  "plugins": ["node"],
-  "extends": ["standard", "eslint:recommended", "plugin:node/recommended"],
+  "plugins": [
+    "node"
+  ],
+  "extends": [
+    "standard",
+    "eslint:recommended",
+    "plugin:node/recommended"
+  ],
+  "ignorePatterns": [
+    "**/*.ts"
+  ],
   "parserOptions": {
-    "ecmaVersion": 2017
+    "ecmaVersion": 2017,
+    "sourceType": "module"
   },
   "env": {
     "node": true,
@@ -11,10 +21,13 @@
   },
   "rules": {
     "space-before-function-paren": "off",
+    "node/no-unsupported-features/es-syntax": "off",
     "node/no-unpublished-require": [
       "error",
       {
-        "allowModules": ["pg"]
+        "allowModules": [
+          "pg"
+        ]
       }
     ]
   }

.gitignore

@@ -5,3 +5,5 @@ build/
 node_modules/
 package-lock.json
 *.swp
+dist
+.DS_Store

packages/pg-packet-stream/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "pg-packet-stream",
+  "version": "1.0.0",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "license": "MIT",
+  "devDependencies": {
+    "@types/node": "^12.12.21",
+    "chunky": "^0.0.0",
+    "typescript": "^3.7.3",
+    "@types/chai": "^4.2.7",
+    "@types/mocha": "^5.2.7",
+    "chai": "^4.2.0",
+    "mocha": "^6.2.2",
+    "ts-node": "^8.5.4"
+  },
+  "scripts": {
+    "test": "mocha -r ts-node/register src/**/*.test.ts"
+  },
+  "dependencies": {}
+}

packages/pg-packet-stream/src/BufferReader.ts

@@ -0,0 +1,44 @@
+const emptyBuffer = Buffer.allocUnsafe(0);
+
+export class BufferReader {
+  private buffer: Buffer = emptyBuffer;
+  // TODO(bmc): support non-utf8 encoding
+  private encoding: string = 'utf-8';
+  constructor(private offset: number = 0) {
+  }
+  public setBuffer(offset: number, buffer: Buffer): void {
+    this.offset = offset;
+    this.buffer = buffer;
+  }
+  public int16() {
+    const result = this.buffer.readInt16BE(this.offset);
+    this.offset += 2;
+    return result;
+  }
+  public byte() {
+    const result = this.buffer[this.offset];
+    this.offset++;
+    return result;
+  }
+  public int32() {
+    const result = this.buffer.readInt32BE(this.offset);
+    this.offset += 4;
+    return result;
+  }
+  public string(length: number): string {
+    const result = this.buffer.toString(this.encoding, this.offset, this.offset + length);
+    this.offset += length;
+    return result;
+  }
+  public cstring(): string {
+    var start = this.offset;
+    var end = this.buffer.indexOf(0, start);
+    this.offset = end + 1;
+    return this.buffer.toString(this.encoding, start, end);
+  }
+  public bytes(length: number): Buffer {
+    const result = this.buffer.slice(this.offset, this.offset + length);
+    this.offset += length;
+    return result;
+  }
+}