The blockchain application in Golang
You need to add the hyperledger GO code to your local installation.
so in your GO/src/github.com folder:
mkdir hyperledger
cd hyperledger
git clone [email protected]:hyperledger/fabric.git
cd fabric
git fetch
git checkout v.06
Then return to this repo and run:
go build .
The run and register it with the blockchain using
CORE_CHAINCODE_ID_NAME=<applicationname> CORE_PEER_ADDRESS=0.0.0.0:7051 ./blockchain-golang-chaincode
CORE_CHAINCODE_ID_NAME=DecodedBlockChain CORE_PEER_ADDRESS=0.0.0.0:7051 ./blockchain-golang-chaincode
### Deploy
Now deploy the chaincode using:
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "deploy",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"init",
"args": []
}
},
"id": 46664
}' "http://0.0.0.0:7050/chaincode"
Note: This will be different in the future when using a cluster of peers since you cannot attach a process to all of them it seems
To create a new owner we need to use the invoke method (this adds a transaction to the blockchain).
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"addOwnerString",
"args": [ "dcd", "Decoded", "100000", "description", "logo-url", "tag" ]
}
},
"id": 2600
}' "http://0.0.0.0:7050/chaincode"
and create another one
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"addOwnerString",
"args": [ "bc", "BlockChain", "100000", "description", "logo-url", "tag" ]
}
},
"id": 2600
}' "http://0.0.0.0:7050/chaincode"
Now we have two companies available. We can read the owners in three ways:
- To now query a specific owner:
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "query",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"read",
"args": [ "dcd" ]
}
},
"id": 1337
}' "http://0.0.0.0:7050/chaincode"
To query all owners without the owners full information
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "query",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"read",
"args": [ "Owners" ]
}
},
"id": 1337
}' "http://0.0.0.0:7050/chaincode"
To query all Owners with full information you can use the function readAllOwners
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "query",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"readAllOwners",
"args": []
}
},
"id": 1337
}' "http://0.0.0.0:7050/chaincode"
To add an asset:
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"addAssetString",
"args": [ "appleId", "Apples", "dcd", "100", "13", "description", "logo", "approval", "approvalqty", "phonenr", "phonemsg", "tag" ]
}
},
"id": 2600
}' "http://0.0.0.0:7050/chaincode"
The quantity and price are no optional
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"addAssetString",
"args": [ "bananaId", "Banana", "dcd", "100", "23", "description", "logo", "approval", "approvalqty", "phonenr", "phonemsg", "tag" ]
}
},
"id": 2600
}' "http://0.0.0.0:7050/chaincode"
To read all the Assets you can use a similar function as for the Owners: readAllAssets
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "query",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"readAllAssets",
"args": [ ]
}
},
"id": 0
}' "http://0.0.0.0:7050/chaincode"
There are two types of Transactions possible at this moment: straight-through (no approval needed) and pending (approval needed).
To transact an asset straight away without approval:
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type": 1,
"chaincodeID": {
"name": "DecodedBlockChain"
},
"ctorMsg": {
"function": "transactAsset",
"args": [
"appleId", "dcd", "bc", "33", "12345", "FALSE"
]
}
},
"id": 1
}' "http://0.0.0.0:7050/chaincode"
The input arguments are: assetId, sellerId, buyerId, quantity, price, approvalRequired.
You can check the transactions using
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "query",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"readAllTransactions",
"args": []
}
},
"id": 0
}' "http://0.0.0.0:7050/chaincode"
To create a transaction that needs to be approved use:
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type": 1,
"chaincodeID": {
"name": "DecodedBlockChain"
},
"ctorMsg": {
"function": "transactAsset",
"args": [
"appleId", "dcd", "bc", "47", "8888", "TRUE"
]
}
},
"id": 1
}' "http://0.0.0.0:7050/chaincode"
To approve a transaction
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type": 1,
"chaincodeID": {
"name": "DecodedBlockChain"
},
"ctorMsg": {
"function": "approveTransaction",
"args": [
"<TRANSACTION-ID>"
]
}
},
"id": 1
}' "http://0.0.0.0:7050/chaincode"
To decline a transaction
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type": 1,
"chaincodeID": {
"name": "DecodedBlockChain"
},
"ctorMsg": {
"function": "declineTransaction",
"args": [
"<TRANSACTION-ID>"
]
}
},
"id": 1
}' "http://0.0.0.0:7050/chaincode"
To change the validation status of an owner:
curl -X POST -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type":1,
"chaincodeID": {
"name":"DecodedBlockChain"
},
"ctorMsg": {
"function":"changeOwnerValidationStatus",
"args": [ "bc" ]
}
},
"id": 2600
}' "http://0.0.0.0:7050/chaincode"
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