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https://github.com/bigchaindb/js-bigchaindb-driver.git
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Completed basic usage example
This commit is contained in:
michielmulders
Tim Daubenschütz
parent
dfaf97e5ce
commit
f2e7e1606b
@ -10,6 +10,7 @@ This example guides you through creating and transferring an asset.
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We walk through the code explaining its use, some pieces are left out
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because they have no real use (e.g. defenition of global variable)
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*Full working code* can be found at the bottom of this document.
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The following code are just snippets.
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Getting Started
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---------------
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@ -17,19 +18,13 @@ We begin by creating an object of BigchainDB driver:
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.. code-block:: js
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// ES6 Browser
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import * as driver from 'js-bigchaindb-driver';
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// ES<<6 Browser
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let driver = require('js-bigchaindb-driver');
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// ES<<6 CommonJS / node
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let driver = require('js-bigchaindb-driver/dist/node');
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const driver = require('bigchaindb-driver')
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Next, we define a constant containing the API path.
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.. code-block:: js
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// http(s)://<bigchaindb-API-url>/ (e.g. http://localhost:9984/api/v1/)
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const API_PATH = 'http://localhost:9984/api/v1/';
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const API_PATH = 'http://localhost:9984/api/v1/'
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Cryptographic Identities Generation
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-----------------------------------
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@ -39,8 +34,8 @@ signed transaction was indeed signed by the one who claims to be the signee.
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.. code-block:: js
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const alice = new driver.Ed25519Keypair();
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const bob = new driver.Ed25519Keypair();
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const alice = new driver.Ed25519Keypair()
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const bob = new driver.Ed25519Keypair()
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Digital Asset Definition
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------------------------
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@ -50,20 +45,18 @@ that represents a bicycle:
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.. code-block:: js
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bicycle = {
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'data': {
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'bicycle': {
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'serial_number': 'abcd1234',
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'manufacturer': 'bkfab',
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},
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},
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}
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assetdata = {
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'bicycle': {
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'serial_number': 'abcd1234',
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'manufacturer': 'Bicycle Inc.',
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}
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}
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We'll suppose that the bike belongs to Alice, and that it eventually will be
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transferred to Bob.
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In general, you are free to define any JSON object you which to store for the
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``'data'`` property
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``'data'`` property (assetdata).
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Metadata Definition (*optional*)
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--------------------------------
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@ -85,26 +78,27 @@ transaction:
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.. code-block:: js
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const txCreateAliceSimple = driver.Transaction.makeCreateTransaction(
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bicycle,
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metadata,
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[ driver.Transaction.makeOutput(
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driver.Transaction.makeEd25519Condition(alice.publicKey)
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)],
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alice.publicKey
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);
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assetdata,
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metadata,
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The transaction now needs to be fulfilled by signing it with Alice’s
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private key:
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// A transaction needs an output
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[ driver.Transaction.makeOutput(
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driver.Transaction.makeEd25519Condition(alice.publicKey))
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],
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alice.publicKey
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)
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Sign the transaction with private key of Alice to fulfill it:
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.. code-block:: js
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const txCreateAliceSimpleSigned = driver.Transaction.signTransaction(txCreateAliceSimple, alice.privateKey);
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const txCreateAliceSimpleSigned = driver.Transaction.signTransaction(txCreateAliceSimple, alice.privateKey)
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And sent over to a BigchainDB node:
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.. code-block:: js
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driver.Connection.postTransaction(txCreateAliceSimpleSigned, API_PATH)
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conn.postTransaction(txCreateAliceSimpleSigned)
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Notice the transaction ``id``:
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@ -116,14 +110,14 @@ To check the status of the transaction:
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.. code-block:: js
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driver.Connection.getStatus(txCreateAliceSimpleSigned.id, API_PATH)
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conn.getStatus(txCreateAliceSimpleSigned.id)
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It is also possible to check the status every 0.5 seconds
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with use of the transaction ``id``:
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.. code-block:: js
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return driver.Connection.pollStatusAndFetchTransaction(txCreateAliceSimpleSigned.id, API_PATH)
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conn.pollStatusAndFetchTransaction(txCreateAliceSimpleSigned.id)
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.. note:: It may take a small amount of time before a BigchainDB cluster
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confirms a transaction as being valid.
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@ -148,12 +142,14 @@ First, let's prepare the transaction to be transferred.
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.. code-block:: js
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const txTransferBob = driver.Transaction.makeTransferTransaction(
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txCreateAliceSimpleSigned,
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{price: '100 euro'},
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[ driver.Transaction.makeOutput(
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driver.Transaction.makeEd25519Condition(bob.publicKey)
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)],
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const txTransferBob = driver.Transaction.makeTransferTransaction(
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// signedTx to transfer
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txCreateAliceSimpleSigned,
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// metadata
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{price: '100 euro'},
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(bob.publicKey))],
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0
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);
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@ -174,21 +170,73 @@ And sent over to a BigchainDB node:
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.. code-block:: js
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return driver.Connection.postTransaction(txTransferBobSigned, API_PATH)
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conn.postTransaction(txTransferBobSigned, API_PATH)
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Check the status again:
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.. code-block:: js
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conn.pollStatusAndFetchTransaction(txTransferBobSigned.id)
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Bob is the new owner:
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.. code-block:: js
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console.log('Is Bob the owner?', tx['outputs'][0]['public_keys'][0] == bob.publicKey)
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// Output: true
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Alice is the former owner:
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.. code-block:: js
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code
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console.log('Was Alice the previous owner?', txTransferBobSigned['inputs'][0]['owners_before'][0] == alice.publicKey )
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// Output: true
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Querying for Assets
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-------------------
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BigchainDB allows you to query for assets using simple text search. This search is applied to all the strings inside the asset payload and returns all the assets that match a given text search string.
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Let’s assume that we created 3 assets that look like this:
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.. code-block:: js
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assets = [
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{'data': {'bicycle': {'serial_number': 'abc', manufacturer: 'Bicycle Inc.'}}},
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{'data': {'bicycle': {'serial_number': 'cde', manufacturer: 'Bicycle Inc.'}}},
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{'data': {'bicycle': {'serial_number': 'fgh', manufacturer: 'Bicycle Inc.'}}}
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]
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Let’s perform a text search for all assets that contain the word 'Bicycle Inc.':
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.. code-block:: js
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let assets = conn.searchAssets('Bicycle Inc.')
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.then((assets) => console.log('Found assets with serial number Bicycle Inc.:', assets))
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Which leads to following result:
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.. code-block:: js
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[
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{
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'data': {'bicycle': {'serial_number': 'abc', manufacturer: 'Bicycle Inc.'}},
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'id': '7582d7a81652d0230fefb47dafc360ff09b2c2566b68f05c3a004d57e7fe7610'
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},
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{
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'data': {'bicycle': {'serial_number': 'cde', manufacturer: 'Bicycle Inc.'}},
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'id': 'e40f4b6ac70b9c1b3b237ec13f4174384fd4d54d36dfde25520171577c49caa4'
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},
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{
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'data': {'bicycle': {'serial_number': 'fgh', manufacturer: 'Bicycle Inc.'}},
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'id': '748f6c30daaf771c9020d84db9ad8ac4d1f7c8de7013db55e16f10ba090f7013'
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}
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]
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This call returns all the assets that match the string 'Bicycle Inc.', sorted by text score, as well as the asset id. This is the same id of the transaction that created the asset.
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Recap: Asset Creation & Transfer
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@ -196,13 +244,102 @@ Recap: Asset Creation & Transfer
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.. code-block:: js
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const driver = require('bigchaindb-driver')
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Other examples
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--------------
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// BigchainDB server instance or IPDB (e.g. https://test.ipdb.io/api/v1/)
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const API_PATH = 'http://localhost:9984/api/v1/'
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// Create a new keypair for Alice and Bob
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const alice = new driver.Ed25519Keypair()
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const bob = new driver.Ed25519Keypair()
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console.log('Alice: ', alice.publicKey)
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console.log('Bob: ', bob.publicKey)
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// Define the asset to store, in this example
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// we store a bicycle with its serial number and manufacturer
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assetdata = {
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'bicycle': {
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'serial_number': 'cde',
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'manufacturer': 'Bicycle Inc.',
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}
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}
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// Metadata contains information about the transaction itself
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// (can be `null` if not needed)
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// E.g. the bicycle is fabricated on earth
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metadata = {'planet': 'earth'}
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// Construct a transaction payload
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const txCreateAliceSimple = driver.Transaction.makeCreateTransaction(
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assetdata,
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metadata,
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// A transaction needs an output
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[ driver.Transaction.makeOutput(
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driver.Transaction.makeEd25519Condition(alice.publicKey))
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],
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alice.publicKey
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)
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// Sign the transaction with private keys of Alice to fulfill it
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const txCreateAliceSimpleSigned = driver.Transaction.signTransaction(txCreateAliceSimple, alice.privateKey)
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// Send the transaction off to BigchainDB
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const conn = new driver.Connection(API_PATH)
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conn.postTransaction(txCreateAliceSimpleSigned)
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// Check status of transaction every 0.5 seconds until fulfilled
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.then(() => conn.pollStatusAndFetchTransaction(txCreateAliceSimpleSigned.id))
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.then(retrievedTx => console.log('Transaction', retrievedTx.id, 'successfully posted.'))
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// Check status after transaction has completed (result: { 'status': 'valid' })
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// If you check the status of a transaction to fast without polling,
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// It returns that the transaction is waiting in the 'backlog'
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.then(() => conn.getStatus(txCreateAliceSimpleSigned.id))
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.then(status => console.log('Retrieved status method 2: ', status))
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// Transfer bicycle to Bob
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.then(() => {
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const txTransferBob = driver.Transaction.makeTransferTransaction(
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// signedTx to transfer
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txCreateAliceSimpleSigned,
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// metadata
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{price: '100 euro'},
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(bob.publicKey))],
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0)
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// Sign with alice's private key
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txTransferBobSigned = driver.Transaction.signTransaction(txTransferBob, alice.privateKey)
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console.log('Posting signed transaction: ', txTransferBobSigned)
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// Post and poll status
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return conn.postTransaction(txTransferBobSigned, API_PATH)
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})
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.then((res) => {
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console.log('Response from BDB server:', res)
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return conn.pollStatusAndFetchTransaction(txTransferBobSigned.id)
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})
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.then((tx) => {
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console.log('Is Bob the owner?', tx['outputs'][0]['public_keys'][0] == bob.publicKey)
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console.log('Was Alice the previous owner?', txTransferBobSigned['inputs'][0]['owners_before'][0] == alice.publicKey )
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})
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.then(() => {
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// Search for asset based on the serial number of the bicycle
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let assets = conn.searchAssets('Bicycle Inc.')
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.then((assets) => console.log('Found assets with serial number Bicycle Inc.:', assets))
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})
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.then(() => {
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// Search for asset based on the serial number of the bicycle
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let assets = conn.searchAssets('Bicycle Inc.')
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.then((assets) => console.log('Found assets with serial number Bicycle Inc.:', assets))
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})
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Divisible Assets
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----------------
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TODO:
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- Add lexer: https://stackoverflow.com/questions/4259105/which-sphinx-code-block-language-to-use-for-json
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- Add lexer: https://stackoverflow.com/questions/4259105/which-sphinx-code-block-language-to-use-for-json
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- Add divisible assets example
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