Can Hyperledger Fabric Chaincodes Retrieve Their Caller\'s Identity?

How to Retrieve Chaincode Caller ID in Hyperledger Fabric Node SDK

In a multi-chaincode network architecture, the question arises of how a called chaincode can identify the originating chaincode. This article explores this topic and its limitations.

Network Architecture

Consider the following network setup:

• A: Application
• Chaincode1: Chaincode written in Go
• fabcar: Chaincode written in Node.js

All components reside on the same channel, "mychannel".

Querying Caller ID

When Chaincode1 utilizes the InvokeChaincode() API to interact with fabcar, the need arises to identify the caller's origin. However, the getCreator() method only provides the caller's organization information, falling short of the desired chaincode-specific identification.

Signed Transaction Analysis

An investigation into the getSignedProposal() method reveals that it provides a decoded SignedProposal object. This object represents the client application's request to the chaincode. However, deciphering the calling chaincode ID from the complex SignedProposal structure proves challenging.

Current Limitations

At present, Hyperledger Fabric does not support chaincode caller ID retrieval directly. As chaincodes are inherently devoid of explicit identities, this information cannot be surfaced. This limitation prevents chaincodes from dynamically adapting their behavior based on the initiating chaincode's identity.

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