Create dev-utils with blockchainLifecycle in it

packages/dev-utils/README.md

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+Dev utils
+------
+
+Dev utils to be shared across 0x projects and packages
+
+## Install
+
+```bash
+yarn add @0xproject/dev-utils
+```

packages/dev-utils/package.json

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+{
+  "name": "@0xproject/dev-utils",
+  "version": "0.0.1",
+  "description": "0x dev TS utils",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "clean": "shx rm -rf lib",
+    "lint": "tslint --project . 'src/**/*.ts'"
+  },
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/0xProject/0x.js.git"
+  },
+  "bugs": {
+    "url": "https://github.com/0xProject/0x.js/issues"
+  },
+  "homepage": "https://github.com/0xProject/0x.js/packages/dev-utils/README.md",
+  "devDependencies": {
+    "@0xproject/tslint-config": "^0.2.0",
+    "@types/lodash": "^4.14.86",
+    "npm-run-all": "^4.1.2",
+    "shx": "^0.2.2",
+    "tslint": "5.8.0",
+    "typescript": "~2.6.1",
+    "types-bn": "^0.0.1",
+    "types-ethereumjs-util": "0xProject/types-ethereumjs-util"
+  },
+  "dependencies": {
+    "bignumber.js": "~4.1.0",
+    "ethereumjs-util": "^5.1.2",
+    "lodash": "^4.17.4",
+    "request-promise-native": "^1.0.5"
+  }
+}

packages/dev-utils/src/blockchain_lifecycle.ts

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+import {RPC} from './rpc';
+
+export class BlockchainLifecycle {
+    private rpc: RPC;
+    private snapshotIdsStack: number[];
+    constructor(url: string) {
+        this.rpc = new RPC(url);
+        this.snapshotIdsStack = [];
+    }
+    // TODO: In order to run these tests on an actual node, we should check if we are running against
+    // TestRPC, if so, use snapshots, otherwise re-deploy contracts before every test
+    public async startAsync(): Promise<void> {
+        const snapshotId = await this.rpc.takeSnapshotAsync();
+        this.snapshotIdsStack.push(snapshotId);
+    }
+    public async revertAsync(): Promise<void> {
+        const snapshotId = this.snapshotIdsStack.pop() as number;
+        const didRevert = await this.rpc.revertSnapshotAsync(snapshotId);
+        if (!didRevert) {
+            throw new Error(`Snapshot with id #${snapshotId} failed to revert`);
+        }
+    }
+    public async mineABlock(): Promise<void> {
+        await this.rpc.mineBlockAsync();
+    }
+}

packages/dev-utils/src/index.ts

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+export {RPC} from './rpc';
+export {BlockchainLifecycle} from './blockchain_lifecycle';

packages/dev-utils/src/rpc.ts

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+import * as ethUtil from 'ethereumjs-util';
+import * as request from 'request-promise-native';
+
+export class RPC {
+    private url: string;
+    private port: number;
+    private id: number;
+    constructor(url: string) {
+        this.url = url;
+        this.id = 0;
+    }
+    public async takeSnapshotAsync(): Promise<number> {
+        const method = 'evm_snapshot';
+        const params: any[] = [];
+        const payload = this.toPayload(method, params);
+        const snapshotIdHex = await this.sendAsync(payload);
+        const snapshotId = ethUtil.bufferToInt(ethUtil.toBuffer(snapshotIdHex));
+        return snapshotId;
+    }
+    public async revertSnapshotAsync(snapshotId: number): Promise<boolean> {
+        const method = 'evm_revert';
+        const params = [snapshotId];
+        const payload = this.toPayload(method, params);
+        const didRevert = await this.sendAsync(payload);
+        return didRevert;
+    }
+    public async increaseTimeAsync(time: number) {
+        const method = 'evm_increaseTime';
+        const params = [time];
+        const payload = this.toPayload(method, params);
+        return this.sendAsync(payload);
+    }
+    public async mineBlockAsync(): Promise<void> {
+        const method = 'evm_mine';
+        const params: any[] = [];
+        const payload = this.toPayload(method, params);
+        await this.sendAsync(payload);
+    }
+    private toPayload(method: string, params: any[] = []): string {
+        const payload = JSON.stringify({
+            id: this.id,
+            method,
+            params,
+        });
+        this.id += 1;
+        return payload;
+    }
+    private async sendAsync(payload: string): Promise<any> {
+        const opts = {
+            method: 'POST',
+            uri: this.url,
+            body: payload,
+            headers: {
+                'content-type': 'application/json',
+            },
+        };
+        const bodyString = await request(opts);
+        const body = JSON.parse(bodyString);
+        return body.result;
+    }
+}

packages/dev-utils/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5",
+    "lib": [ "es2017", "dom"],
+    "outDir": "lib",
+    "sourceMap": true,
+    "declaration": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true
+  },
+  "include": [
+    "./src/**/*",
+    "../../node_modules/types-bn/index.d.ts",
+    "../../node_modules/types-ethereumjs-util/index.d.ts"
+  ]
+}

packages/dev-utils/tslint.json

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+{
+  "extends": [
+    "@0xproject/tslint-config"
+  ]
+}