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This article mainly shows you "how to use Hyperledger Fabric's SDK to develop REST API server", the content is easy to understand, clear, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "how to use Hyperledger Fabric's SDK to develop REST API server" this article.

1. Overview of system structure

The entire system consists of two physical nodes:

Fabric node: runs First Network in the Fabric example and instantiates the Fabcar chain code

API server node: running REST API Server code for external access

The following is the case of two node instances deployed on AWS:

2. Then create a directory on Rest API Server:

Mkdir apiservercd apiserver

3. Then copy the following file from the Fabric node to the Rest API Server node. We use loccalhost to copy between two EC2 instances:

# localhost (update your own IP of the two servers) # temp is an empty directorycd tempscp-I ~ / Downloads/aws.pem ubuntu@ [Fabric-Node-IP]: / home/ubuntu/fabric-samples/first-network/connection-org1.json .scp-I ~ / Downloads/aws.pem ubuntu@ [Fabric-Node-IP]: / home/ubuntu/fabric-samples/fabcar/javascript/package.json .scp-r-I ~ / Downloads/aws.pem ubuntu@ [Fabric-Node-IP]: / home/ubuntu / fabric-samples/fabcar/javascript/wallet/user1/ .scp-r-I ~ / Downloads/aws.pem * ubuntu@ [API-Server-Node-IP]: / home/ubuntu/apiserver/

The running results are as follows:

4. You can see that all the files have been copied to Rest API Server. In order to maintain consistency, we renamed user1/ to wallet/user1/:.

Cd apiservermkdir walletmv user1 wallet/user1

The running results are as follows:

5. Now create the above apiserver.js file on Rest API Server.

6. Modify the ip address of the fabric node in the connection profile connection-org1.json:

Sed-I 's/localhost/ [Fabric-Node-IP] / g' connection-org1.json

The running results are as follows:

7. Add an entry in / etc/hosts so that the IP of the fabric node can be parsed correctly:

127.0.0.1 localhost [Fabric-Node-IP] orderer.example.com [Fabric-Node-IP] peer0.org1.example.com [Fabric-Node-IP] peer1.org1.example.com [Fabric-Node-IP] peer0.org2.example.com [Fabric-Node-IP] peer1.org2.example.com

The running results are as follows:

8. Install the necessary dependency packages:

Npm installnpm install express body-parser-save

9. When everything is ready, start Rest API Server:

Node apiserver.js7, visit API

Our API service listens on port 8080, and in the following example, we use curl to demonstrate how to access it.

1. Query all vehicle records

Curl http://[API-Server-Node-IP]:8080/api/queryallcars

The running results are as follows:

2. Add new vehicle records and query

Curl-d'{carid: "CAR12", "make": "Honda", "model": "Accord", "colour": "black", "owner": "Tom"}'- H "Content-Type: application/json"-X POST http://[API-Server-Node-IP]:8080/api/addcarcurl http://[API-Server-Node-IP]:8080/api/query/CAR12

The running results are as follows:

3. Modify the vehicle owner and query again

Curl http://[API-Server-Node-IP]:8080/api/query/CAR4curl-d'{"owner": "KC"}'- H "Content-Type: application/json"-X PUT http://[API-Server-Node-IP]:8080/api/changeowner/CAR4curl http://[API-Server-Node-IP]:8080/api/query/CAR4

The running results are as follows:

We can also use postman to get the same result:

The above is all the content of the article "how to use Hyperledger Fabric's SDK to develop REST API server". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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