zkkxyz / workflow

基于hyperledger fabric区块链的工作流审批应用

审批工作流

基于官方示例fabric-samples/balance-transfer

A sample Node.js app to demonstrate fabric-client & fabric-ca-client Node.js SDK APIs

Prerequisites and setup:

• Docker - v1.12 or higher
• Docker Compose - v1.8 or higher
• Git client - needed for clone commands
• Node.js v8.4.0 or higher
• Download Docker images

cd workflow/workflow

Once you have completed the above setup, you will have provisioned a local network with the following docker container configuration:

• 2 CAs
• A SOLO orderer
• 4 peers (2 peers per Org)

Artifacts

• Crypto material has been generated using the cryptogen tool from Hyperledger Fabric and mounted to all peers, the orderering node and CA containers. More details regarding the cryptogen tool are available here.
• An Orderer genesis block (genesis.block) and channel configuration transaction (mychannel.tx) has been pre generated using the configtxgen tool from Hyperledger Fabric and placed within the artifacts folder. More details regarding the configtxgen tool are available here.

Running the sample program

There are two options available for running the balance-transfer sample For each of these options, you may choose to run with chaincode written in golang or in node.js.

Terminal Window 1

• Launch the network using docker-compose

docker-compose -f artifacts/docker-compose.yaml up

Terminal Window 2

• Install the fabric-client and fabric-ca-client node modules

npm install

• Start the node app on PORT 4000

PORT=4000 node app

现在，我们已经启动了网络，并且启用了balance-transfer案例为我们提供的restful接口。相关内容参考fabric 1.1版本的fabric-samples/balance-transfer，其中我对app/invoke-chaincode进行了改动，让返回值为查询的结果，而不是交易id。

Express

我们切换到Experss目录

cd workflow/Express

此目录是我用node.js Express框架搭建的应用，提供一个简单的web界面，调用restful api实现区块链的应用。

安装依赖包

npm install
npm install node-schedule
npm install node-rest-client

运行app，默认运行在3000端口

node app

打开浏览器http://localhost:3000可以看到注册页面

首先进入http://localhost:3000/admin，依次点击页面上的链接，进行 获取restful的token、创建channel、节点加入channel、安装chaincode、实例化chaincode。此处可参照fabric-samples/balance-transfer的readme。内置的参数与fabric-samples/balance-transfer基本相同，区别是我们使用了自己编写的新的chaincode，增添了提案工作流的各项功能。

workflow/workflow/artifacts/src/github.com/example_cc/chain.go

文件即为新的chaincode。

在http://localhost:3000界面进行注册和登陆。用户type只能为student、teacher、school。school的id必须为0。

界面待完善。