mirror of
https://github.com/bigchaindb/js-bigchaindb-driver.git
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docs updated to new makeTransferTransaction format
This commit is contained in:
manolodewiner
tim
parent
9f385c440d
commit
6031868245
@ -14,7 +14,7 @@ First, we create an asset registering the bicycle:
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const txCreateAliceSimple = driver.Transaction.makeCreateTransaction(
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{'asset': 'bicycle'},
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{'purchase_price': '€240'},
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[
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[
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driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(alice.publicKey))
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],
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alice.publicKey
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@ -29,10 +29,10 @@ So, Alice needs a crypto conditions that defines that she or her daughter can si
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We need to define a threshold as well. This defines how many persons have to sign the transaction to ``TRANSFER`` it.
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In this case, we define two subconditions with the public keys from Alice and Carly. Next, we set the threshold to **one**.
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This means that just one of the subconditions has to sign the transaction to transfer it.
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This can be the mother Alice, or Carly herself.
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This can be the mother Alice, or Carly herself.
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.. code-block:: js
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// Create condition for Alice and Carly
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let subConditionFrom = driver.Transaction.makeEd25519Condition(alice.publicKey, false)
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let subConditionTo = driver.Transaction.makeEd25519Condition(carly.publicKey, false)
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@ -47,11 +47,10 @@ This can be the mother Alice, or Carly herself.
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output.public_keys = [carly.publicKey]
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let transaction = driver.Transaction.makeTransferTransaction(
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txCreateAliceSimpleSigned,
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{'meta': 'Transfer to new user with conditions'},
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[output],
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0
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);
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[{ tx: txCreateAliceSimpleSigned, output_index: 0 }],
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[output],
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{'meta': 'Transfer to new user with conditions'}
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);
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// Add alice as previous owner
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transaction.inputs[0].owners_before = [alice.publicKey]
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@ -36,11 +36,11 @@ A simple connection with BigchainDB can be established like this.
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const conn = new driver.Connection(API_PATH)
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It is also possible to connect to a BigchainDB node of the IPDB test net.
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To do so, you need to pass the **app_id and app_key**.
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To do so, you need to pass the **app_id and app_key**.
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.. code-block:: js
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.. code-block:: js
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let bdb = new driver.Connection('https://test.ipdb.io/api/v1/', {
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let bdb = new driver.Connection('https://test.ipdb.io/api/v1/', {
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app_id: 'dgi829l9',
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app_key: 'u008ik1bf83b43ce3a95uu0727e66fb9'
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})
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@ -71,10 +71,10 @@ that represents a bicycle:
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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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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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In general, you are free to define any JSON object you which to store for the
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``'data'`` property (assetdata).
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Metadata Definition (*optional*)
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@ -91,11 +91,11 @@ For example, the bicycle will be transferred on earth which is metadata:
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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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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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assetdata,
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metadata,
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@ -113,10 +113,10 @@ For `CREATE` Transactions, this should usually just be a list of
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Outputs wrapping Ed25519 Conditions generated from the issuers' public
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keys (so that the issuers are the recipients of the created asset).
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``alice.publicKey`` can be considered as the Input for the transaction.
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Each input spends/transfers a previous output by satisfying/fulfilling
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the crypto-conditions on that output. A CREATE transaction should have
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exactly one input. A TRANSFER transaction should have at least one input (i.e. ≥1).
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``alice.publicKey`` can be considered as the Input for the transaction.
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Each input spends/transfers a previous output by satisfying/fulfilling
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the crypto-conditions on that output. A CREATE transaction should have
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exactly one input. A TRANSFER transaction should have at least one input (i.e. ≥1).
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Sign the transaction with private key of Alice to fulfill it:
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@ -142,7 +142,7 @@ To check the status of the transaction:
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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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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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@ -168,29 +168,28 @@ Alice could retrieve the transaction:
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conn.getTransaction(txCreateAliceSimpleSigned.id)
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First, let's prepare the transaction to be transferred.
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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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// signedTx to transfer
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txCreateAliceSimpleSigned,
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// signedTx to transfer and output index
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[{ tx: txCreateAliceSimpleSigned, output_index: 0 }],
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(bob.publicKey))],
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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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{price: '100 euro'}
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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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- Unspent outputs: Array of `unspent transactions outputs`. Each item contains `Transaction` itself and index of `unspent output` for that `Transaction`.
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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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- Metadata for transaction (e.g. price of sold bike)
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Fulfill transaction by signing it with Alice's private key.
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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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@ -245,9 +244,9 @@ Let’s perform a text search for all assets that contain the word 'Bicycle Inc.
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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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Which leads to following result:
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.. code-block:: js
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.. code-block:: js
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[
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{
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@ -331,13 +330,13 @@ Recap: Asset Creation & Transfer
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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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// signedTx to transfer and output index
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[{ tx: txCreateAliceSimpleSigned, output_index: 0 }],
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(bob.publicKey))],
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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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{price: '100 euro'}
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)
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// Sign with alice's private key
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let txTransferBobSigned = driver.Transaction.signTransaction(txTransferBob, alice.privateKey)
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console.log('Posting signed transaction: ', txTransferBobSigned)
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@ -356,13 +355,13 @@ Recap: Asset Creation & Transfer
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// Search for asset based on the serial number of the bicycle
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.then(() => conn.searchAssets('Bicycle Inc.'))
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.then(assets => console.log('Found assets with serial number Bicycle Inc.:', assets))
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Ed25519Keypair Seed Functionality
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Ed25519Keypair Seed Functionality
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---------------------------------
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BigchainDB JavaScript driver allows you to create a keypair based on a seed.
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The constructor accepts a 32 byte seed. One of the ways to create a seed from
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BigchainDB JavaScript driver allows you to create a keypair based on a seed.
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The constructor accepts a 32 byte seed. One of the ways to create a seed from
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a string (e.g. a passphrase) is the one used by ``bip39``, specifically the function ``mnemonicToSeed``.
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Install bip39 with npm: ``npm install bip39``
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@ -490,7 +489,7 @@ Below piece of code can be opened in your web browser. It will connect to your w
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</div>
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Besides that, a NodeJs version has been created to display the validated transactions.
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Besides that, a NodeJs version has been created to display the validated transactions.
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All transactions are printed to the console. To use this piece of code, you will need the ``ws`` (WebSocket package) through npm: ``npm install --save ws``.
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.. code-block:: js
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@ -514,13 +513,13 @@ All transactions are printed to the console. To use this piece of code, you will
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Difference unspent and spent output
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-----------------------------------
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An unspent output is simply an output of a transaction which isn't yet an input of another transaction.
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So, if we transfer an asset, the output becomes spent, because it becomes the input of the transfer transaction.
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So, if we transfer an asset, the output becomes spent, because it becomes the input of the transfer transaction.
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The transfer transactions its output becomes unspent now until he transfers the asset again to somebody else.
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We will demonstrate this with a piece of code where we transfer a bicycle from Alice to Bob,
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We will demonstrate this with a piece of code where we transfer a bicycle from Alice to Bob,
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and further we transfer it from Bob to Chris. Expectations:
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* Output for Alice is spent
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* Output for Alice is spent
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* Output for Bob is spent
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* Output for Chris is unspent (he is the last person in transaction chain)
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@ -528,8 +527,8 @@ and further we transfer it from Bob to Chris. Expectations:
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const driver = require('bigchaindb-driver')
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const API_PATH = 'http://localhost:9984/api/v1/'
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const conn = new driver.Connection(API_PATH)
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const conn = new driver.Connection(API_PATH)
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const alice = new driver.Ed25519Keypair()
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const bob = new driver.Ed25519Keypair()
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const chris = new driver.Ed25519Keypair()
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@ -571,11 +570,11 @@ and further we transfer it from Bob to Chris. Expectations:
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// Transfer bicycle from Alice to Bob
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.then(() => {
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const txTransferBob = driver.Transaction.makeTransferTransaction(
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txCreateAliceSimpleSigned,
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{'newOwner': 'Bob'},
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(bob.publicKey))],
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0)
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[{ tx: txCreateAliceSimpleSigned, output_index: 0 }],
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(bob.publicKey))],
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{'newOwner': 'Bob'}
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)
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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('\n\nPosting signed transaction to Bob:\n', txTransferBobSigned)
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@ -588,11 +587,11 @@ and further we transfer it from Bob to Chris. Expectations:
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// Second transfer of bicycle from Bob to Chris
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.then(tx => {
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const txTransferChris = driver.Transaction.makeTransferTransaction(
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txTransferBobSigned,
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{'newOwner': 'Chris'},
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(chris.publicKey))],
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0)
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[{ tx: txTransferBobSigned, output_index: 0 }],
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[driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(chris.publicKey))],
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{'newOwner': 'Chris'}
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)
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// Sign with bob's private key
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let txTransferChrisSigned = driver.Transaction.signTransaction(txTransferChris, bob.privateKey)
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console.log('\n\nPosting signed transaction to Chris:\n', txTransferChrisSigned)
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@ -627,7 +626,7 @@ and further we transfer it from Bob to Chris. Expectations:
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})
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.catch(res => {console.log(res)})
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Output of above code looks like this. As you can see, Chris has no spent output, but one unspent output.
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Output of above code looks like this. As you can see, Chris has no spent output, but one unspent output.
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.. code-block:: js
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@ -654,7 +653,7 @@ Let's assume we have created a token to pay each other for small transactions li
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}
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Let's create the asset. Note that we give an extra parameter to the ``makeOutput()`` function.
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We give it the parameter ``'4'`` to indicate that we want to create 4 tokens.
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We give it the parameter ``'4'`` to indicate that we want to create 4 tokens.
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**Pay attention to give the function a String instead of a plain Number.**
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.. code-block:: js
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@ -676,35 +675,36 @@ This gives us 4 tokens to transfer.
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.. code-block:: js
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const txTransferDivisible = driver.Transaction.makeTransferTransaction(
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txCreateAliceDivisibleSigned,
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{
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metaDataMessage: 'I am specific to this transfer transaction'
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},
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[{ tx: txCreateAliceDivisibleSigned, output_index: 0 }],
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[
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driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(carly.publicKey), '2'),
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driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(bob.publicKey), '1'),
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driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(alice.publicKey), '1')
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], 0);
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],
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{
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metaDataMessage: 'I am specific to this transfer transaction'
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}
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);
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To make the use of the last parameter of ``makeTransferTransaction()`` function more clear, we will do another transfer.
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We will fulfill the first and second output of the create transaction (0, 1) because Carly and Bob decide to redistribute some money.
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* Output 0 represents 2 tokens for Carly
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* Output 1 represents 1 token for Bob
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* Output 1 represents 1 token for Bob
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This gives us 3 tokens to redistribute. I want to give 1 token to Carly and 2 tokens Alice.
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.. code-block:: js
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const txTransferDivisibleInputs = driver.Transaction.makeTransferTransaction(
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txTransferDivisibleSigned,
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{
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metaDataMessage: 'I am specific to this transfer transaction'
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},
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[{ tx: txTransferDivisibleSigned, output_index: 0 }, { tx: txTransferDivisibleSigned, output_index: 1 }],
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[
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driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(carly.publicKey), '1'),
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driver.Transaction.makeOutput(driver.Transaction.makeEd25519Condition(alice.publicKey), '2')
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], 0, 1)
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],
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{
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metaDataMessage: 'I am specific to this transfer transaction'
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}
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);
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Because we want to fulfill two outputs (Carly and Bob), we have to sign the transfer transaction in the same order:
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