March 2019
Intermediate to advanced
636 pages
27h 50m
English
book
Blockchain Development with Hyperledger
by Salman A. Baset, Luc Desrosiers, Nitin Gaur, Petr Novotny
Content preview from Blockchain Development with Hyperledger
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Modification in chaincode logic
Let us first consider a scenario that requires us to update (or upgrade) our trade chaincode. The addition of a new organization, which we just carried out in the previous section, necessitates certain changes in chaincode. As an example, let us consider the following code snippet in the acceptTrade function in chaincode/src/github.com/trade_workflow/tradeWorkflow.go:
// Accept a trade agreement func (t *TradeWorkflowChaincode) acceptTrade(stub shim.ChaincodeStubInterface, creatorOrg string, creatorCertIssuer string, args []string) pb.Response { // Access control: Only an Exporter Org member can invoke this transaction if !t.testMode && !authenticateExporterOrg(creatorOrg, creatorCertIssuer) { return shim.Error("Caller ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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