From 52f1e4293b08fab7c8ff07494867af2215ff1b03 Mon Sep 17 00:00:00 2001 From: Roby Daquilante Date: Mon, 4 Nov 2019 11:32:03 -0800 Subject: [PATCH] Add hello world simple smart contract for use in quickstart guide --- hello-world/.gitignore | 1 + hello-world/Dockerfile | 12 + hello-world/README.md | 80 ++++ hello-world/package.json | 18 + hello-world/spec/hello.spec.js | 17 + hello-world/src/hello.js | 6 + hello-world/src/index.js | 9 + hello-world/yarn.lock | 643 +++++++++++++++++++++++++++++++++ state-example/.yarnclean | 98 ----- state-example/README.md | 14 +- 10 files changed, 792 insertions(+), 106 deletions(-) create mode 100644 hello-world/.gitignore create mode 100644 hello-world/Dockerfile create mode 100644 hello-world/README.md create mode 100644 hello-world/package.json create mode 100644 hello-world/spec/hello.spec.js create mode 100644 hello-world/src/hello.js create mode 100644 hello-world/src/index.js create mode 100644 hello-world/yarn.lock delete mode 100644 state-example/.yarnclean diff --git a/hello-world/.gitignore b/hello-world/.gitignore new file mode 100644 index 0000000..b512c09 --- /dev/null +++ b/hello-world/.gitignore @@ -0,0 +1 @@ +node_modules \ No newline at end of file diff --git a/hello-world/Dockerfile b/hello-world/Dockerfile new file mode 100644 index 0000000..2401b05 --- /dev/null +++ b/hello-world/Dockerfile @@ -0,0 +1,12 @@ +FROM node:12-alpine AS base +WORKDIR /app + +FROM base AS builder +COPY package.json package.json +COPY yarn.lock yarn.lock +RUN yarn --frozen-lockfile --non-interactive --production + +FROM base AS release +COPY --chown=1000:1000 ./src ./src +COPY --from=builder --chown=1000:1000 /app/node_modules ./node_modules +USER 1000:1000 \ No newline at end of file diff --git a/hello-world/README.md b/hello-world/README.md new file mode 100644 index 0000000..2101265 --- /dev/null +++ b/hello-world/README.md @@ -0,0 +1,80 @@ +# Simple "Hello World" Smart Contract + +This contract demonstrates how easy it is to develop on Dragonchain and how quickly you can produce a working smart contract prototype. The SC greeter is implemented as a single function in Nodejs with a single import. Even the Dockerfile is simple, requiring no prior experience. + +## Dockerfile + +```Dockerfile +FROM node:12-alpine AS base # Using a lightweight base image keeps SC size small +WORKDIR /app # Not strictly necessary, but enforces the working directory instead of determining it at build time + +FROM base AS builder # Use a different layer to keep from installing anything unnecessary on the final image +COPY package.json package.json # Copy only what we need to install packages +COPY yarn.lock yarn.lock # Docker COPY commands can only move one file at a time +RUN yarn --frozen-lockfile --non-interactive --production # Run yarn to install node packages + +FROM base AS release # This layer will be the final image produced by the Dockerfile +COPY --chown=1000:1000 ./src ./src # Copy source code from local directory +COPY --from=builder --chown=1000:1000 /app/node_modules ./node_modules # Copy node modules from 'builder' layer +USER 1000:1000 # Set user for the docker image for easier local development +``` + +## Smart Contract Code + +Because Dragonchain smart contracts run in isolation using [openfaas](https://www.openfaas.com/), they accept input from stdin. In this example, we use [get-stdin](https://www.npmjs.com/package/get-stdin) to read input as strings. + +In most cases, simple strings are not sufficient for smart contract execution. Dragonchain suggests submitting JSON objects as strings for complicated workflows. For this example, the expected object has a single key, `name`, which can be of any Stringifiable data type. + +The function that executes smart contract logic must be exported. In this case, we use an index.js file as the entry point to the smart contract that parses stdin and provides the value to the function provided in [hello.js](./src/hello.js). + +```js +module.exports = async function (fullTransaction) { +``` + +Just like any service, a smart contract should validate its inputs. For the greeter function, we want to ensure that the payload provided by the user contains a `name`. + +```js + if (!fullTransaction || !fullTransaction.payload || !fullTransaction.payload.name) { + return { error: "I can't say hi if I don't know your name!" }; + } +``` + +After verifying inputs are valid, the smart contract should execute its internal logic. This could include manipulating blockchain heap data, performing arbitrary calculations, ledgering data, managing permissions, etc. Once the SC has finished executing its logic, it can return a string or a JSON object to be ledgered onto the chain as output. By default, all SC executions ledger their output, but this can be optionally disabled. + +```js + /* Execute logic here */ + + // Return JSON or a string to finish execution. + return { greeting: `Hello ${name}!`} +} +``` + +To see the output from a smart contract, you can query using your transaction id for the invocation request. For example, if you're using dctl to interact with your dragonchain and your transaction create command returns transaction_id `banana`, you would search for transactions with `@invoker:{banana}`. + +```sh +$ dctl t c hello-world '{ "name": "dragonchain" }' +{ + "status": 201, + "response": { + "transaction_id": "banana" + }, + "ok": true +} +$ dctl t q state-test '@invoker:{banana}' +{ + ... + "header": { + "txn_type": "hello-world", + ... + "invoker": "banana" + }, + "payload": { + "greeting": "Hello dragonchain!" + }, + ... +} +``` + +## Examples + +For simplicity, a [small test suite](./spec/hello.spec.js) is included to give some examples how to use a smart contract. Smart contracts that institute business logic should be tested like any other business unit. diff --git a/hello-world/package.json b/hello-world/package.json new file mode 100644 index 0000000..00f3360 --- /dev/null +++ b/hello-world/package.json @@ -0,0 +1,18 @@ +{ + "name": "@dragonchain-dev/hello-world", + "version": "1.0.0", + "description": "demonstrate a simple dragonchain smart contract", + "main": "hello.js", + "scripts": { + "test": "mocha './spec/**/*.spec.js' --exit" + }, + "author": "", + "license": "ISC", + "dependencies": { + "get-stdin": "^7.0.0" + }, + "devDependencies": { + "chai": "^4.2.0", + "mocha": "^6.2.2" + } +} diff --git a/hello-world/spec/hello.spec.js b/hello-world/spec/hello.spec.js new file mode 100644 index 0000000..c1a5d93 --- /dev/null +++ b/hello-world/spec/hello.spec.js @@ -0,0 +1,17 @@ +const { expect } = require('chai'); +const greeting = require('../src/hello'); + +describe('greeter', () => { + it('greets a string name', async () => { + const res = await greeting({ payload: { name: 'banana'} }); + expect(res).to.deep.equal({ greeting: 'Hello banana!' }); + }); + it('greets a number name', async () => { + const res = await greeting({ payload: { name: 3.1415} }); + expect(res).to.deep.equal({ greeting: 'Hello 3.1415!' }); + }); + it('Cant greet someone without a name', async () => { + const res = await greeting(); + expect(res).to.deep.equal({ error: "I can't say hi if I don't know your name!" }); + }); +}) diff --git a/hello-world/src/hello.js b/hello-world/src/hello.js new file mode 100644 index 0000000..1f0d0bf --- /dev/null +++ b/hello-world/src/hello.js @@ -0,0 +1,6 @@ +module.exports = async function (fullTransaction) { + if (!fullTransaction || !fullTransaction.payload || !fullTransaction.payload.name) { + return { error: "I can't say hi if I don't know your name!" }; + } + return { greeting: `Hello ${fullTransaction.payload.name}!`} +} \ No newline at end of file diff --git a/hello-world/src/index.js b/hello-world/src/index.js new file mode 100644 index 0000000..d220254 --- /dev/null +++ b/hello-world/src/index.js @@ -0,0 +1,9 @@ +const getStdin = require('get-stdin'); +const greeting = require('./hello'); + +getStdin().then(async val => { + const res = await greeting(JSON.parse(val)); + process.stdout.write(JSON.stringify(res)) +}).catch(e => { + console.error(e.stack); +}); \ No newline at end of file diff --git a/hello-world/yarn.lock b/hello-world/yarn.lock new file mode 100644 index 0000000..012b142 --- /dev/null +++ b/hello-world/yarn.lock @@ -0,0 +1,643 @@ +# THIS IS AN AUTOGENERATED FILE. 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"^4.0.0" + yargs-parser "^13.1.1" diff --git a/state-example/.yarnclean b/state-example/.yarnclean deleted file mode 100644 index 51c67ad..0000000 --- a/state-example/.yarnclean +++ /dev/null @@ -1,98 +0,0 @@ -# This file is only used for builds AFTER being transpiled - -Jenkinsfile -Makefile -Gulpfile.js -Gruntfile.js -gulpfile.js -.DS_Store -.tern-project -.gitattributes -.editorconfig -.eslintrc -eslint -.eslintrc.js -.eslintrc.json -.eslintrc.yml -.stylelintrc -stylelint.config.js -.stylelintrc.json -.stylelintrc.yaml -.stylelintrc.yml -.stylelintrc.js -.htmllintrc -htmllint.js -.lint -.npmrc -.jshintrc -.flowconfig -.documentup.json -.yarn-metadata.json -.travis.yml -appveyor.yml -.gitlab-ci.yml -circle.yml -.coveralls.yml -CHANGES -changelog -LICENSE.txt -LICENSE -LICENSE-MIT -LICENSE.BSD -license -LICENCE.txt -LICENCE -LICENCE-MIT -LICENCE.BSD -licence -AUTHORS -CONTRIBUTORS -.yarn-integrity -.yarnclean -_config.yml -.babelrc -.yo-rc.json -jest.config.js -karma.conf.js -wallaby.js -wallaby.conf.js -.prettierrc -.prettierrc.yml -.prettierrc.toml -.prettierrc.js -.prettierrc.json -prettier.config.js -.appveyor.yml -tsconfig.json -tslint.json - -__tests__ -test -tests -powered-test -docs -doc -.idea -.vscode -website -images -assets -example -examples -coverage -.nyc_output -.circleci -.github -codeship-services.yml -codeship-steps.yml -wercker.yml - -.*ignore -*.markdown -*.md -*.mkd -*.ts -*.jst -*.coffee -*.tgz -*.swp diff --git a/state-example/README.md b/state-example/README.md index 6de9f7e..a80bcaa 100644 --- a/state-example/README.md +++ b/state-example/README.md @@ -38,13 +38,11 @@ This example demonstrates a simple end to end use for the blockchain heap. Keys The code as-is runs like so: -Logs outputted by the smart contract are marked with `>` in the example. - ```sh -dctl t c state-test '{ "method": "add", "key": "banana" }' ->2019/10/02 23:14:35 stderr: obj { banana: 0 } -dctl t c state-test '{ "method": "get", "key": "banana" }' ->2019/10/02 23:15:38 stderr: obj { banana: 1 } -dctl t c state-test '{ "method": "get", "key": "banana" }' ->2019/10/02 23:15:38 stderr: obj { banana: 2 } +$ dctl t c state-test '{ "method": "add", "key": "banana" }' +2019/10/02 23:14:35 stderr: obj { banana: 0 } +$ dctl t c state-test '{ "method": "get", "key": "banana" }' +2019/10/02 23:15:38 stderr: obj { banana: 1 } +$ dctl t c state-test '{ "method": "get", "key": "banana" }' +2019/10/02 23:15:38 stderr: obj { banana: 2 } ```