Initial commit

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true

.eslintignore

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+build/
+dist/
+node_modules/
+.snapshots/
+*.min.js

.eslintrc

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+{
+  "parser": "babel-eslint",
+  "extends": [
+    "standard",
+    "standard-react",
+    "plugin:prettier/recommended",
+    "prettier/standard",
+    "prettier/react"
+  ],
+  "env": {
+    "node": true,
+    "jest": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "ecmaFeatures": {
+      "legacyDecorators": true,
+      "jsx": true
+    }
+  },
+  "settings": {
+    "react": {
+      "version": "16"
+    }
+  },
+  "rules": {
+    "space-before-function-paren": 0,
+    "react/prop-types": 0,
+    "react/jsx-handler-names": 0,
+    "react/jsx-fragments": 0,
+    "react/no-unused-prop-types": 0,
+    "import/export": 0
+  }
+}

.gitignore

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+# dependencies
+node_modules
+
+# builds
+build
+dist
+.rpt2_cache
+
+# misc
+.DS_Store
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+*~
+.idea
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

.travis.yml

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+language: node_js
+node_js:
+  - 12
+  - 10
+dist: bionic

package.json

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+{
+  "name": "@project-serum/serum",
+  "version": "0.1.0",
+  "description": "Library for interacting with the serum dex",
+  "license": "MIT",
+  "repository": "serum-foundation/serum-js",
+  "main": "dist/index.js",
+  "module": "dist/index.module.js",
+  "unpkg": "dist/index.umd.js",
+  "source": "src/index.js",
+  "engines": {
+    "node": ">=10"
+  },
+  "scripts": {
+    "build": "microbundle",
+    "start": "microbundle watch",
+    "prepare": "run-s build",
+    "test": "run-s test:unit test:lint test:build",
+    "test:build": "run-s build",
+    "test:lint": "eslint .",
+    "test:unit": "cross-env CI=1 react-scripts test --env=jsdom",
+    "test:watch": "react-scripts test --env=jsdom",
+    "predeploy": "cd example && yarn install && yarn run build",
+    "deploy": "gh-pages -d example/build"
+  },
+  "devDependencies": {
+    "@solana/web3.js": "^0.64.0",
+    "babel-eslint": "^10.0.3",
+    "cross-env": "^7.0.2",
+    "eslint": "^6.8.0",
+    "eslint-config-prettier": "^6.7.0",
+    "eslint-config-standard": "^14.1.0",
+    "eslint-config-standard-react": "^9.2.0",
+    "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-node": "^11.0.0",
+    "eslint-plugin-prettier": "^3.1.1",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-react": "^7.17.0",
+    "eslint-plugin-standard": "^4.0.1",
+    "gh-pages": "^2.2.0",
+    "microbundle": "^0.12.3",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^2.0.4",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "react-scripts": "^3.4.1"
+  },
+  "files": [
+    "dist"
+  ],
+  "jest": {
+    "transformIgnorePatterns": [
+      "^.+\\.cjs$"
+    ]
+  },
+  "prettier": {
+    "singleQuote": true,
+    "trailingComma": "all"
+  },
+  "dependencies": {
+    "@solana/web3.js": "^0.64.0",
+    "buffer-layout": "^1.2.0"
+  }
+}

src/index.js

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+import { u8, nu64, u32, seq, blob, struct, union, offset } from 'buffer-layout';
+import { zeros, publicKeyLayout } from './layout';
+
+const SLAB_HEADER_LAYOUT = struct(
+  [
+    u32('bumpIndex'),
+    zeros(4),
+    u32('freeListLen'),
+    zeros(4),
+    u32('freeListHead'),
+    u32('rootNode'),
+    u32('leafCount'),
+    zeros(4),
+  ],
+  'header',
+);
+
+const SLAB_NODE_LAYOUT = union(u32('tag'), blob(60), 'node');
+SLAB_NODE_LAYOUT.addVariant(0, struct([]), 'uninitialized');
+SLAB_NODE_LAYOUT.addVariant(
+  1,
+  struct([u32('prefixLen'), blob(16, 'key'), seq(u32(), 2, 'children')]),
+  'innerNode',
+);
+SLAB_NODE_LAYOUT.addVariant(
+  2,
+  struct([
+    u8('ownerSlot'),
+    blob(3),
+    blob(16, 'key'),
+    publicKeyLayout('owner'),
+    nu64('quantity'),
+  ]),
+  'leafNode',
+);
+SLAB_NODE_LAYOUT.addVariant(3, struct([u32('next')]), 'freeNode');
+SLAB_NODE_LAYOUT.addVariant(4, struct([]), 'lastFreeNode');
+
+const SLAB_LAYOUT = struct([
+  SLAB_HEADER_LAYOUT,
+  seq(
+    SLAB_NODE_LAYOUT,
+    offset(
+      SLAB_HEADER_LAYOUT.layoutFor('bumpIndex'),
+      SLAB_HEADER_LAYOUT.offsetOf('bumpIndex') - SLAB_HEADER_LAYOUT.span,
+    ),
+    'nodes',
+  ),
+]);
+
+export function parseSlab(slab) {
+  const { header, nodes } = SLAB_LAYOUT.decode(slab);
+  return { header, nodes };
+}

src/index.test.js

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+import { parseSlab } from './index';
+
+describe('slab', () => {
+  it('parses', () => {
+    const slab = parseSlab(
+      Buffer.from(
+        '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',
+        'hex',
+      ),
+    );
+    console.log(slab);
+    console.log(slab.nodes[1]);
+    console.log(slab.nodes[1].leafNode.owner.toBase58());
+  });
+});

src/layout.js

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+import { Blob } from 'buffer-layout';
+import { PublicKey } from '@solana/web3.js';
+
+class Zeros extends Blob {
+  decode(b, offset) {
+    const slice = super.decode(b, offset);
+    if (!slice.every((v) => v === 0)) {
+      throw new Error('nonzero padding bytes');
+    }
+    return slice;
+  }
+}
+
+export function zeros(length) {
+  return new Zeros(length);
+}
+
+class PublicKeyLayout extends Blob {
+  constructor(property) {
+    super(32, property);
+  }
+
+  decode(b, offset) {
+    return new PublicKey(super.decode(b, offset));
+  }
+
+  encode(src, b, offset) {
+    return super.encode(src.toBuffer(), b, offset);
+  }
+}
+
+export function publicKeyLayout(property) {
+  return new PublicKeyLayout(property);
+}