added migrations and jest config.

.eslintrc.json

@@ -0,0 +1,22 @@
+{
+  "extends": "airbnb-base",
+  "parser": "babel-eslint",
+  "plugins": [
+    "flowtype",
+    "mocha"
+  ],
+  "rules": {
+    "flowtype/define-flow-type": 1,
+    "flowtype/type-id-match": [
+      2,
+      "^([A-Z][a-z0-9]+)+Type$"
+    ],
+    "arrow-parens": "off",
+    "function-paren-newline": "off",
+    "no-extra-semi": "error",
+    "semi": ["error", "never"]
+  },
+  "env": {
+    "mocha": true
+  }
+}

jest.config.js

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+// For a detailed explanation regarding each configuration property, visit:
+// https://jestjs.io/docs/en/configuration.html
+
+module.exports = {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // Respect "browser" field in package.json when resolving modules
+  // browser: false,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "/private/var/folders/w4/l72xh77s2g511lf4z58mghyr0000gn/T/jest_dx",
+
+  // Automatically clear mock calls and instances between every test
+  clearMocks: true,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  // collectCoverage: false,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  // collectCoverageFrom: null,
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: "coverage",
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  // coverageReporters: [
+  //   "json",
+  //   "text",
+  //   "lcov",
+  //   "clover"
+  // ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: null,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: null,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // Force coverage collection from ignored files usin a array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: null,
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: null,
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  // moduleFileExtensions: [
+  //   "js",
+  //   "json",
+  //   "jsx",
+  //   "ts",
+  //   "tsx",
+  //   "node"
+  // ],
+
+  // A map from regular expressions to module names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  // preset: null,
+
+  // Run tests from one or more projects
+  // projects: null,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state between every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: null,
+
+  // Automatically restore mock state between every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: null,
+
+  // A list of paths to directories that Jest should use to search for files in
+  // roots: [
+  //   "<rootDir>"
+  // ],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  testEnvironment: "node",
+
+  // Options that will be passed to the testEnvironment
+  // testEnvironmentOptions: {},
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  // testMatch: [
+  //   "**/__tests__/**/*.[jt]s?(x)",
+  //   "**/?(*.)+(spec|test).[tj]s?(x)"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  // testPathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: [],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: null,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jasmine2",
+
+  // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
+  // testURL: "http://localhost",
+
+  // Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
+  // timers: "real",
+
+  // A map from regular expressions to paths to transformers
+  // transform: null,
+
+  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: null,
+
+  // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+};

migrations/1551434913541_block-hashes.js

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+exports.shorthands = undefined
+
+exports.up = (pgm) => {
+  pgm.createTable('block_hashes', {
+    id: 'id',
+    hash: { type: 'varchar(1000)', notNull: true },
+  })
+  pgm.createTable('tip', {
+    id: 'id',
+    hash: { type: 'varchar(1000)', notNull: true },
+  })
+}
+
+exports.down = (pgm) => {
+
+}

migrations/1551443534749_unique-hashes.js

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+exports.shorthands = undefined;
+
+exports.up = (pgm) => {
+  pgm.addConstraint('block_hashes', 'uniq_hash', {unique: 'hash'})
+};
+
+exports.down = (pgm) => {
+
+};

src/cardano-bridge-api.js

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+import urljoin from 'url-join'
+import axios from 'axios'
+
+export default class CardanoBridgeApi {
+  constructor(baseUrl, template = 'testnet') {
+    this.baseUrl = baseUrl
+    this.template = template
+    this.networkBaseUrl = urljoin(baseUrl, template)
+  }
+
+  async getJson(path) {
+    const resp = await this.get(path)
+    return resp.getJson()
+  }
+
+  async get(path) {
+    const endpointUrl = urljoin(this.networkBaseUrl, path)
+    const resp = await axios(endpointUrl)
+    return resp
+  }
+
+  async getTip() {
+    const resp = await this.get('/tip')
+    return resp
+  }
+
+  async getEpochById(id) {
+    const resp = await this.get(`/epoch/${id}`)
+    return resp
+  }
+}

src/cardano-bridge-api.test.js

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+import CardanoBridgeApi from './cardano-bridge-api'
+
+it('get blockchain tip', async () => {
+  const api = new CardanoBridgeApi('http://localhost:8082')
+  const resp = await api.getEpochById(3)
+  console.log(typeof resp.data)
+})

src/db-queries.js

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+const upsertBlockHash = 'INSERT INTO block_hashes (hash) VALUES ($1) ON CONFLICT (hash) DO NOTHING'
+const queries = {
+  upsertBlockHash,
+}
+export default queries