commit beea051c8a17d1321eeba4c5492b39663fceb668 Author: Alexey Date: Wed May 27 18:52:57 2020 +0300 init diff --git a/.editiorconfig b/.editiorconfig new file mode 100644 index 0000000..5d12634 --- /dev/null +++ b/.editiorconfig @@ -0,0 +1,13 @@ +# editorconfig.org +root = true + +[*] +indent_style = space +indent_size = 2 +end_of_line = lf +charset = utf-8 +trim_trailing_whitespace = true +insert_final_newline = true + +[*.md] +trim_trailing_whitespace = false diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..9b26ed0 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules +lib \ No newline at end of file diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 0000000..f36c104 --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,24 @@ +{ + // Use IntelliSense to learn about possible attributes. + // Hover to view descriptions of existing attributes. + // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 + "version": "0.2.0", + "configurations": [ + { + "type": "node", + "request": "launch", + "name": "Mocha Current File", + "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha", + "args": [ + "--no-timeouts", + "--colors", + "${file}", + "--require", + "ts-node/register" + ], + "console": "integratedTerminal", + "sourceMaps": true, + "internalConsoleOptions": "neverOpen" + } + ] +} \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..6740b6a --- /dev/null +++ b/README.md @@ -0,0 +1,14 @@ +# Gas Price Oracle library for Ethereum dApps + +## Instalation +`npm i gas-price-oracle` + +## Usage +```js +const { GasPriceOracle } = require('gas-price-oracle'); +const oracle = new GasPriceOracle(); + +oracle.fetchGasPrices().then((gas) => { + console.log(gas) +}); +``` diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..f4db455 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1292 @@ +{ + "name": 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"tslint -p tsconfig.json" + }, + "author": "Alexey Pertsev (https://peppersec.com)", + "license": "MIT", + "devDependencies": { + "@types/chai": "^4.2.11", + "@types/mocha": "^7.0.2", + "chai": "^4.2.0", + "mocha": "^7.2.0", + "tslint": "^6.1.2", + "tslint-config-standard": "^9.0.0" + }, + "dependencies": { + "@types/node": "^14.0.5", + "@types/node-fetch": "^2.5.7", + "node-fetch": "^2.6.0", + "ts-node": "^8.10.1", + "typescript": "^3.9.3" + }, + "files": [ + "lib/**/*" + ] +} diff --git a/src/config.ts b/src/config.ts new file mode 100644 index 0000000..6863c63 --- /dev/null +++ b/src/config.ts @@ -0,0 +1,28 @@ + +import { Oracle } from './types'; + +const ethgasstation: Oracle = { + name: 'ethgasstation', + url: 'https://ethgasstation.info/json/ethgasAPI.json', + instantPropertyName: 'fastest', + fastPropertyName: 'fast', + standardPropertyName: 'average', + lowPropertyName: 'safeLow', + denominator: 10 +}; + +const zoltu: Oracle = { + name: 'zoltu', + url: 'https://gas-oracle.zoltu.io/', + instantPropertyName: 'percentile_99', + fastPropertyName: 'percentile_90', + standardPropertyName: 'percentile_60', + lowPropertyName: 'percentile_30', + denominator: 1 +}; + +export default { + oracles: [ + ethgasstation, zoltu + ] +}; diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..3eb7d24 --- /dev/null +++ b/src/index.ts @@ -0,0 +1,44 @@ +import fetch from 'node-fetch'; +import config from './config'; +import { GasPrice, Oracle } from './types'; + +export class GasPriceOracle { + lastGasPrice: GasPrice = { + instant: 40, + fast: 21, + standard: 10, + low: 1 + }; + + async fetchGasPrices(): Promise { + for (let oracle of config.oracles) { + const { name, url, instantPropertyName, fastPropertyName, standardPropertyName, lowPropertyName, denominator } = oracle; + try { + const response = await fetch(url); + if (response.status === 200) { + const gas = await response.json(); + if (Number(gas[fastPropertyName]) === 0) { + throw new Error(`${name} oracle provides corrupted values`); + } + const gasPrices: GasPrice = { + instant: parseFloat(gas[instantPropertyName]) / denominator, + fast: parseFloat(gas[fastPropertyName]) / denominator, + standard: parseFloat(gas[standardPropertyName]) / denominator, + low: parseFloat(gas[lowPropertyName]) / denominator + }; + this.lastGasPrice = gasPrices; + } else { + throw new Error(`Fetch gasPrice from ${name} oracle failed. Trying another one...`); + } + } catch (e) { + console.error(e.message); + } + } + // TODO: additional arg `throwIfFailsToFetch` that throws if it fails to fetch from all oracles + return this.lastGasPrice; + } + + addOracle(oracle: Oracle) { + config.oracles.push(oracle); + } +} diff --git a/src/types.ts b/src/types.ts new file mode 100644 index 0000000..fe15fbb --- /dev/null +++ b/src/types.ts @@ -0,0 +1,16 @@ +export type Oracle = { + name: string + url: string + instantPropertyName: string, + fastPropertyName: string, + standardPropertyName: string, + lowPropertyName: string, + denominator: number +}; + +export type GasPrice = { + instant: number; + fast: number; + standard: number; + low: number; +}; diff --git a/tests/index.test.ts b/tests/index.test.ts new file mode 100644 index 0000000..614635f --- /dev/null +++ b/tests/index.test.ts @@ -0,0 +1,10 @@ +import { GasPriceOracle } from '../src/index'; +import { GasPrice } from '../src/types'; + +describe('Get gas price', function () { + it('should work', async function () { + const oracle = new GasPriceOracle(); + const gas: GasPrice = await oracle.fetchGasPrices(); + console.log(gas); + }); +}); diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..6dd6ac1 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,71 @@ +{ + "compilerOptions": { + /* Basic Options */ + "target": "es2017" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */, + "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */, + "lib": [ + "es2017", + "esnext.asynciterable", + "es2019" + ] /* Specify library files to be included in the compilation. */, + "outDir": "./lib", /* Redirect output structure to the directory. */ + "strict": true /* Enable all strict type-checking options. */, + "strictPropertyInitialization": false /* Enable strict checking of property initialization in classes. */, + "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */, + "declaration": true, /* Generates corresponding '.d.ts' file. */ + // "allowJs": true, /* Allow javascript files to be compiled. */ + // "checkJs": true, /* Report errors in .js files. */ + // "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */ + // "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */ + // "sourceMap": true, /* Generates corresponding '.map' file. */ + // "outFile": "./", /* Concatenate and emit output to single file. */ + // "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */ + // "composite": true, /* Enable project compilation */ + // "removeComments": true, /* Do not emit comments to output. */ + // "noEmit": true, /* Do not emit outputs. */ + // "importHelpers": true, /* Import emit helpers from 'tslib'. */ + // "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */ + // "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */ + + /* Strict Type-Checking Options */ + // "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */ + // "strictNullChecks": true, /* Enable strict null checks. */ + // "strictFunctionTypes": true, /* Enable strict checking of function types. */ + // "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */ + // "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */ + // "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */ + + /* Additional Checks */ + // "noUnusedLocals": true, /* Report errors on unused locals. */ + // "noUnusedParameters": true, /* Report errors on unused parameters. */ + // "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */ + // "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */ + + /* Module Resolution Options */ + // "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */ + // "baseUrl": "./", /* Base directory to resolve non-absolute module names. */ + // "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */ + // "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */ + // "typeRoots": [], /* List of folders to include type definitions from. */ + // "types": [], /* Type declaration files to be included in compilation. */ + // "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */ + // "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */ + + /* Source Map Options */ + // "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */ + // "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */ + // "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */ + // "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */ + + /* Experimental Options */ + "experimentalDecorators": true /* Enables experimental support for ES7 decorators. */, + "emitDecoratorMetadata": true /* Enables experimental support for emitting type metadata for decorators. */, + "plugins": [ + { + "name": "typescript-tslint-plugin" + } + ] + }, + "include": ["src"], + "exclude": ["node_modules", "tests"] +} diff --git a/tslint.json b/tslint.json new file mode 100644 index 0000000..1fd14e6 --- /dev/null +++ b/tslint.json @@ -0,0 +1,9 @@ +{ + "extends": "tslint-config-standard", + "defaultSeverity": "error", + "rules": { + "semicolon": [true, "always"], + "space-before-function-paren": [true, {"anonymous": "always", "named": "never", "asyncArrow": "always"}] + } +} +