Main Interfaces to Communicate with Ledger Peer

Q

What are Main Interfaces to Communicate with a ledger peer on a hyperledger fabric network?

✍: FYIcenter.com

A

There are 3 Main Interfaces to Communicate with a ledger peer on a hyperledger fabric network.

1. Peer CLI - The Peer CLI is a Command Line Interface (CLI) provided as part of the Hyperledger Fabric distribution package. It is normally distributed as a Docker container image. and allows you to run the "peer" command to communicate with a ledger peer.

The following example shows you how to run the Peer CLI from the CLI docker container:

$ docker exec -it cli bash

bash-4.4# echo $CORE_PEER_ADDRESS
peer0.org1.example.com:7051

bash-4.4# peer node status
status:STARTED

2. Client REST API - The Client REST API is provided at default port 5000 of the ledger peer. But this API is no longer supported since Hyperledger Fabric 1.0.0.

The following example shows you how to get the blockchain information from a ledger peer running at 172.17.0.2:5000:

$ curl 172.17.0.2:5000/chain

{
    "height":10001,
    "currentBlockHash":"4Yc4yCO95wcpWHW2NLFlf76OGURBBxYZMf3yUyvrEXs5TMai9qNKfy9Yn/=="
}

3. Operation REST API - The Operation REST API is provided at default port 9443 of the ledger peer and default port 8443 of the orderer peer. This REST API is for operators to maintain the peer, not for users to interact with content of the network.

The following example shows you how to check the health of the ledger peer running at 172.17.0.2:9443:

$ curl 172.17.0.2:9443/healthz

{
  "status": "OK",
  "time": "2009-11-10T23:00:00Z"
}

4. Golang SDK - The Golang SDK is a set Golang library that encapsulates interaction protocol to allow you interface with a ledger peer with a Golang program.

For more information on Golang SDK, see github.com/hyperledger/fabric-sdk-go.

5. Other SDKs - SDKs for other languages are also available:

 

Download and Install Golang SDK

Interfaces to Communicate with Ledger Peer

Interfaces to Communicate with Ledger Peer

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2020-01-21, 259👍, 0💬