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Basic usage examples added, not completed
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@ -7,6 +7,7 @@ BigchainDB Javascript Driver Documentation
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← Back to All BigchainDB Docs <https://bigchaindb.readthedocs.io/en/latest/index.html>
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readme
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quickstart
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usage
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Another header
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docs/source/quickstart.rst
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Quickstart
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==========
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=========================
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Quickstart / Installation
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=========================
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Quickstart comes here
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Installation with package manager npm:
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.. code-block:: bash
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$ npm install bigchaindb-driver
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====================
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Basic Usage Examples
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====================
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For the examples on this page, we assume you've :doc:`installed the bigchaindb_driver JavaScript package <quickstart>`,
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and you have determined the BigchainDB Root URL (issue: move this to general docs)
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of the node or cluster you want to connect to.
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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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Getting Started
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---------------
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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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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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Cryptographic Identities Generation
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-----------------------------------
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Alice and Bob are represented by public/private key pairs. The private key is
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used to sign transactions, meanwhile the public key is used to verify that a
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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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Digital Asset Definition
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------------------------
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As an example, let’s consider the creation and transfer of a digital asset
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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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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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Metadata Definition (*optional*)
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--------------------------------
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You can `optionally` add metadata to a transaction. Any JSON object is accepted.
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For example, the bicycle will be transferred on earth which is metadata:
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.. code-block:: js
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metadata = {'planet': 'earth'}
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Asset Creation
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--------------
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We're now ready to create the digital asset. First, let's make a 'CREATE'
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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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The transaction now needs to be fulfilled by signing it with Alice’s
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private key:
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.. code-block:: js
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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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Notice the transaction ``id``:
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.. code-block:: js
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txid = txCreateAliceSimpleSigned.id
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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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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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.. 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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Asset Transfer
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--------------
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Imagine some time goes by, during which Alice is happy with her bicycle, and
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one day, she meets Bob, who is interested in acquiring her bicycle. The timing
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is good for Alice as she had been wanting to get a new bicycle.
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To transfer the bicycle (asset) to Bob, Alice must consume the transaction in
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which the Bicycle asset was created.
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Alice could retrieve the transaction:
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.. code-block:: js
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driver.Connection.getTransaction(txCreateAliceSimpleSigned.id)
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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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0
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);
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The function ``makeTransferTransaction()`` needs following parameters:
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- Unspent transaction: Previous transaction you have control over (i.e. can fulfill its Output Condition)
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- Metadata for transaction (e.g. price of sold bike)
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- Array of output objects to add to the transaction: Think of these as the recipients of the asset after the transaction. For `TRANSFER` transactions, this should usually just be a list of outputs wrapping Ed25519 conditions generated from the public keys of the recipients.
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- Indices of the outputs in `unspent transaction` that this transaction fulfills.
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Fulfill transaction by signing it with Alice's private key.
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.. code-block:: js
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txTransferBobSigned = driver.Transaction.signTransaction(txTransferBob, alice.privateKey);
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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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Bob is the new owner:
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.. code-block:: js
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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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Recap: Asset Creation & Transfer
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--------------------------------
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.. code-block:: js
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Other examples
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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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