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[FAB-5898] porting samples to node.js chaincode
Fabric 1.1 supports javascript chaincode. This changeset addresses porting of the golang chaincode to node.js chiancode and the corresponding README files Change-Id: Iae24e713f16ab3508fe0cc18ee062ffa412b8ba6 Signed-off-by: ratnakar <asara.ratnakar@gmail.com>
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140
balance-transfer/artifacts/src/github.com/example_cc/node/example_cc.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| /* | ||
| # Copyright IBM Corp. All Rights Reserved. | ||
| # | ||
| # SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
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| const shim = require('fabric-shim'); | ||
| const util = require('util'); | ||
|
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| var Chaincode = class { | ||
|
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| // Initialize the chaincode | ||
| async Init(stub) { | ||
| console.info('========= example_cc Init ========='); | ||
| let ret = stub.getFunctionAndParameters(); | ||
| console.info(ret); | ||
| let args = ret.params; | ||
| // initialise only if 4 parameters passed. | ||
| if (args.length != 4) { | ||
| return shim.error('Incorrect number of arguments. Expecting 4'); | ||
| } | ||
|
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| let A = args[0]; | ||
| let B = args[2]; | ||
| let Aval = args[1]; | ||
| let Bval = args[3]; | ||
|
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| if (typeof parseInt(Aval) !== 'number' || typeof parseInt(Bval) !== 'number') { | ||
| return shim.error('Expecting integer value for asset holding'); | ||
| } | ||
|
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| try { | ||
| await stub.putState(A, Buffer.from(Aval)); | ||
| try { | ||
| await stub.putState(B, Buffer.from(Bval)); | ||
| return shim.success(); | ||
| } catch (err) { | ||
| return shim.error(err); | ||
| } | ||
| } catch (err) { | ||
| return shim.error(err); | ||
| } | ||
| } | ||
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| async Invoke(stub) { | ||
| let ret = stub.getFunctionAndParameters(); | ||
| console.info(ret); | ||
| let method = this[ret.fcn]; | ||
| if (!method) { | ||
| console.error('no method of name:' + ret.fcn + ' found'); | ||
| return shim.error('no method of name:' + ret.fcn + ' found'); | ||
| } | ||
|
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| console.info('\nCalling method : ' + ret.fcn); | ||
| try { | ||
| let payload = await method(stub, ret.params); | ||
| return shim.success(payload); | ||
| } catch (err) { | ||
| console.log(err); | ||
| return shim.error(err); | ||
| } | ||
| } | ||
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| async move(stub, args) { | ||
| if (args.length != 3) { | ||
| throw new Error('Incorrect number of arguments. Expecting 3'); | ||
| } | ||
|
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| let A = args[0]; | ||
| let B = args[1]; | ||
| if (!A || !B) { | ||
| throw new Error('asset holding must not be empty'); | ||
| } | ||
|
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| // Get the state from the ledger | ||
| let Avalbytes = await stub.getState(A); | ||
| if (!Avalbytes) { | ||
| throw new Error('Failed to get state of asset holder A'); | ||
| } | ||
| let Aval = parseInt(Avalbytes.toString()); | ||
|
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| let Bvalbytes = await stub.getState(B); | ||
| if (!Bvalbytes) { | ||
| throw new Error('Failed to get state of asset holder B'); | ||
| } | ||
|
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| let Bval = parseInt(Bvalbytes.toString()); | ||
| // Perform the execution | ||
| let amount = parseInt(args[2]); | ||
| if (typeof amount !== 'number') { | ||
| throw new Error('Expecting integer value for amount to be transaferred'); | ||
| } | ||
|
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| Aval = Aval - amount; | ||
| Bval = Bval + amount; | ||
| console.info(util.format('Aval = %d, Bval = %d\n', Aval, Bval)); | ||
|
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| // Write the states back to the ledger | ||
| await stub.putState(A, Buffer.from(Aval.toString())); | ||
| await stub.putState(B, Buffer.from(Bval.toString())); | ||
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| } | ||
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| // Deletes an entity from state | ||
| async delete(stub, args) { | ||
| if (args.length != 1) { | ||
| throw new Error('Incorrect number of arguments. Expecting 1'); | ||
| } | ||
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| let A = args[0]; | ||
|
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| // Delete the key from the state in ledger | ||
| await stub.deleteState(A); | ||
| } | ||
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| // query callback representing the query of a chaincode | ||
| async query(stub, args) { | ||
| if (args.length != 1) { | ||
| throw new Error('Incorrect number of arguments. Expecting name of the person to query') | ||
| } | ||
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| let jsonResp = {}; | ||
| let A = args[0]; | ||
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| // Get the state from the ledger | ||
| let Avalbytes = await stub.getState(A); | ||
| if (!Avalbytes) { | ||
| jsonResp.error = 'Failed to get state for ' + A; | ||
| throw new Error(JSON.stringify(jsonResp)); | ||
| } | ||
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| jsonResp.name = A; | ||
| jsonResp.amount = Avalbytes.toString(); | ||
| console.info('Query Response:'); | ||
| console.info(jsonResp); | ||
| return Avalbytes; | ||
| } | ||
| }; | ||
|
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| shim.start(new Chaincode()); |
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15
balance-transfer/artifacts/src/github.com/example_cc/node/package.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| { | ||
| "name": "example_cc", | ||
| "version": "1.0.0", | ||
| "description": "node-js version of example_02.go chaincode", | ||
| "engines": { | ||
| "node": ">=8.4.0", | ||
| "npm": ">=5.3.0" | ||
| }, | ||
| "scripts": { "start" : "node example_cc.js" }, | ||
| "engine-strict": true, | ||
| "license": "Apache-2.0", | ||
| "dependencies": { | ||
| "fabric-shim": "unstable" | ||
| } | ||
| } |
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