Using Rest APIs to Interact with a Blockchain Network
Instructions for setting the blockchainNetwork
Welcome to Part 2 of building a Blockchain Application. Now that you have created a blockchain network, you can learn how to interact with it using Rest APIs.
Included Components
- Hyperledger Fabric
- Docker
- Hyperledger Fabric SDK for node.js
Application Workflow Diagram
Prerequisites
- Docker - v1.13 or higher
- Docker Compose - v1.8 or higher
Steps
- Run Build.sh Script to build network
- Start the Network
- Check the logs to see the results
- Use REST APIs to interact with the network
1. Run the Build.sh Script
Open a new terminal and run the following command:
export FABRIC_CFG_PATH=$(pwd)
chmod +x cryptogen
chmod +x configtxgen
chmod +x ./rabbitCluster/cluster-entrypoint.sh
chmod +x generate-certs.sh
chmod +x generate-cfgtx.sh
chmod +x docker-images.sh
chmod +x build.sh
chmod +x clean.sh
./build.sh2. Start the Network
Make sure the 'LOCALCONFIG' environment variable is unset if you are re-running this step after running the test below
unset LOCALCONFIG There 2 options to install chaincode on the peer nodes and start the Blockchain network. You can select any one of the following:
- Using LevelDB to store the blockchain state database. Run the following command to start the network:
docker-compose -p "fitcoin" -f "docker-compose.yaml" up -d 3. Check the logs
Command
docker logs blockchain-setupOutput:
Register CA fitcoin-org
CA registration complete FabricCAServices : {hostname: fitcoin-ca, port: 7054}
Register CA shop-org
CA registration complete FabricCAServices : {hostname: shop-ca, port: 7054}
info: [EventHub.js]: _connect - options {"grpc.ssl_target_name_override":"shop-peer","grpc.default_authority":"shop-peer"}
info: [EventHub.js]: _connect - options {"grpc.ssl_target_name_override":"fitcoin-peer","grpc.default_authority":"fitcoin-peer"}
Default channel not found, attempting creation...
Successfully created a new default channel.
Joining peers to the default channel.
Chaincode is not installed, attempting installation...
Base container image present.
info: [packager/Golang.js]: packaging GOLANG from bcfit
info: [packager/Golang.js]: packaging GOLANG from bcfit
Successfully installed chaincode on the default channel.
Successfully instantiated chaincode on all peers.Command
docker psOutput:
80de48d4f372 dev-fitcoin-peer-bcfit-1-7df93f2b75a05e9e7896ce92dcb057539e271722e43eba5ff9c75aae902fdcce "chaincode -peer.add…" 3 hours ago Up 3 hours dev-fitcoin-peer-bcfit-1
0bb401fe44b9 backend "node index.js" 3 hours ago Up 3 hours fitcoin_fitcoin-backend_1
f873f201e99c backend "node index.js" 3 hours ago Up 3 hours fitcoin_shop-backend_1
c7fdf4341ee9 rabbit-client "node index.js" 3 hours ago Up 3 hours 0.0.0.0:3000->3000/tcp rabbit-client
499cf8d837ea redis-server "/docker-entrypoint.…" 3 hours ago Up 3 hours 6379/tcp, 0.0.0.0:7000-7007->7000-7007/tcp fitcoin_redis-server_1
febba02cc941 dev-shop-peer-bcfit-1-0e0d4e71de9ac7df4d0d20dfcf583e3e63227edda600fe338485053387e09c50 "chaincode -peer.add…" 3 hours ago Up 3 hours dev-shop-peer-bcfit-1
03141f47f646 haproxy:1.7 "/docker-entrypoint.…" 3 hours ago Up 3 hours 0.0.0.0:5672->5672/tcp, 0.0.0.0:15672->15672/tcp rabbitmq
5ada66d99be3 rabbitmq:3-management "/usr/local/bin/clus…" 3 hours ago Up 3 hours 4369/tcp, 5671-5672/tcp, 15671-15672/tcp, 25672/tcp rabbitmq3
f51d8f5d7fc7 rabbitmq:3-management "/usr/local/bin/clus…" 3 hours ago Up 3 hours 4369/tcp, 5671-5672/tcp, 15671-15672/tcp, 25672/tcp rabbitmq2
172cabad39b4 rabbitmq:3-management "docker-entrypoint.s…" 3 hours ago Up 3 hours 4369/tcp, 5671-5672/tcp, 15671-15672/tcp, 25672/tcp rabbitmq1
5ffcf480fbb6 blockchain-setup "node index.js" 3 hours ago Up 3 hours 3000/tcp blockchain-setup
f58e488b23da fitcoin-peer "peer node start" 3 hours ago Up 3 hours 0.0.0.0:8051->7051/tcp, 0.0.0.0:8053->7053/tcp fitcoin-peer
8e4facc6fd4a shop-peer "peer node start" 3 hours ago Up 3 hours 0.0.0.0:7051->7051/tcp, 0.0.0.0:7053->7053/tcp shop-peer
4297f9e1f45c hyperledger/fabric-couchdb:x86_64-1.0.2 "tini -- /docker-ent…" 3 hours ago Up 3 hours 4369/tcp, 9100/tcp, 0.0.0.0:6984->5984/tcp couchdb1
e0fdc5312585 orderer-peer "orderer" 3 hours ago Up 3 hours 0.0.0.0:7050->7050/tcp orderer0
56c209a37bed shop-ca "fabric-ca-server st…" 3 hours ago Up 3 hours 0.0.0.0:7054->7054/tcp shop-ca
1db6a6ca3a6f fitcoin-ca "fabric-ca-server st…" 3 hours ago Up 3 hours 0.0.0.0:8054->7054/tcp fitcoin-ca
c90b289a10e6 hyperledger/fabric-couchdb:x86_64-1.0.2 "tini -- /docker-ent…" 3 hours ago Up 3 hours 4369/tcp, 9100/tcp, 0.0.0.0:5984->5984/tcp couchdb0Command
docker logs fitcoin_fitcoin-backend_1Output:
Register CA fitcoin-org
CA registration complete FabricCAServices : {hostname: fitcoin-ca, port: 7054}
Register CA fitcoin-org
CA registration complete FabricCAServices : {hostname: fitcoin-ca, port: 7054}
info: [EventHub.js]: _connect - options {"grpc.ssl_target_name_override":"fitcoin-peer","grpc.default_authority":"fitcoin-peer","grpc.max_receive_message_length":-1,"grpc.max_send_message_length":-1}
info: [EventHub.js]: _connect - options {"grpc.ssl_target_name_override":"fitcoin-peer","grpc.default_authority":"fitcoin-peer","grpc.max_receive_message_length":-1,"grpc.max_send_message_length":-1}
connected to the server
creating server queue connection user_queue
[x] Awaiting RPC requests
Command
docker logs fitcoin_shop-backend_1Output:
Register CA shop-org
CA registration complete FabricCAServices : {hostname: shop-ca, port: 7054}
Register CA shop-org
CA registration complete FabricCAServices : {hostname: shop-ca, port: 7054}
info: [EventHub.js]: _connect - options {"grpc.ssl_target_name_override":"shop-peer","grpc.default_authority":"shop-peer","grpc.max_receive_message_length":-1,"grpc.max_send_message_length":-1}
info: [EventHub.js]: _connect - options {"grpc.ssl_target_name_override":"shop-peer","grpc.default_authority":"shop-peer","grpc.max_receive_message_length":-1,"grpc.max_send_message_length":-1}
Starting socker server
connected to the server
creating server queue connection seller_queue
[x] Awaiting RPC requests
4. Use REST APIs to interact with the network
To view the Blockchain Events
In a separate terminal navigate to testApplication folder and run the following command:
cd testApplication
npm install
node index.js
Navigate to url to view the blockchain blocks: http://localhost:8000/history.html Now navigate to url to perform operations on network : http://localhost:8000/test.html
Sample values for request
Enroll Operation
type = enroll
userId = <userID> i.e. user1
fcn = enroll
args = <userID> i.e. user1
Invoke Operation
type = invoke
userId = <userID> i.e. user1
fcn = generateFitcoins
args = <userID>,<Number as String> i.e. user1,"500"
Query Operation
type = query
userId = <userID> i.e. user1
fcn = getState
args = <userID> i.e. user1
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent