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61 lines
4.4 KiB
Markdown
61 lines
4.4 KiB
Markdown
Notary demo
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This demo shows a party getting transactions notarised by either a single-node or a distributed notary service.
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All versions of the demo start two counterparty nodes.
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One of the counterparties will generate transactions that transfer a self-issued asset to the other party and submit
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them for notarisation.
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The Raft (https://raft.github.io/) version of the demo will start three distributed notary nodes.
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The BFT SMaRt (https://bft-smart.github.io/library/) version of the demo will start four distributed notary nodes.
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The output will display a list of notarised transaction IDs and corresponding signer public keys. In the Raft distributed notary,
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every node in the cluster can service client requests, and one signature is sufficient to satisfy the notary composite key requirement.
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In the BFT SMaRt distributed notary, three signatures are required.
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You will notice that successive transactions get signed by different members of the cluster (usually allocated in a random order).
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To run the Raft version of the demo from the command line in Unix:
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1. Run ``./gradlew samples:notary-demo:deployNodes``, which will create all three types of notaries' node directories
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with configs under ``samples/notary-demo/build/nodes/nodesRaft`` (``nodesBFT`` and ``nodesSingle`` for BFT and
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Single notaries).
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2. Run ``./samples/notary-demo/build/nodes/nodesRaft/runnodes``, which will start the nodes in separate terminal windows/tabs.
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Wait until a "Node started up and registered in ..." message appears on each of the terminals
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3. Run ``./gradlew samples:notary-demo:notarise`` to make a call to the "Party" node to initiate notarisation requests
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In a few seconds you will see a message "Notarised 10 transactions" with a list of transaction ids and the signer public keys
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To run from the command line in Windows:
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1. Run ``gradlew samples:notary-demo:deployNodes``, which will create all three types of notaries' node directories
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with configs under ``samples/notary-demo/build/nodes/nodesRaft`` (``nodesBFT`` and ``nodesSingle`` for BFT and
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Single notaries).
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2. Run ``samples\notary-demo\build\nodes\nodesRaft\runnodes``, which will start the nodes in separate terminal windows/tabs.
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Wait until a "Node started up and registered in ..." message appears on each of the terminals
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3. Run ``gradlew samples:notary-demo:notarise`` to make a call to the "Party" node to initiate notarisation requests
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In a few seconds you will see a message "Notarised 10 transactions" with a list of transaction ids and the signer public keys
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To run the BFT SMaRt notary demo, use ``nodesBFT`` instead of ``nodesRaft`` in the path (you will see messages from notary nodes
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trying to communicate each other sometime with connection errors, that's normal). For a single notary node, use ``nodesSingle``.
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Distributed notary nodes store consumed states in a replicated commit log, which is backed by a H2 database on each node.
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You can ascertain that the commit log is synchronised across the cluster by accessing and comparing each of the nodes' backing stores
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by using the H2 web console:
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- Firstly, download H2 web console (http://www.h2database.com/html/download.html) (download the "platform-independent zip"),
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and start it using a script in the extracted folder: ``sh h2/bin/h2.sh`` (or ``h2\bin\h2`` for Windows)
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- If you are uncertain as to which version of h2 to install or if you have connectivity issues, refer to ``build.gradle``
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located in the corda directory and locate ``h2_version``. Use a client of the same major version - even if still in beta.
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- The H2 web console should start up in a web browser tab. To connect we first need to obtain a JDBC connection string.
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Each node outputs its connection string in the terminal window as it starts up. In a terminal window where a **notary** node is running,
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look for the following string:
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``Database connection url is : jdbc:h2:tcp://10.18.0.150:56736/node``
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You can use the string on the right to connect to the h2 database: just paste it into the `JDBC URL` field and click *Connect*.
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You will be presented with a web application that enumerates all the available tables and provides an interface for you to query them using SQL
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- The committed states are stored in the ``NOTARY_COMMITTED_STATES`` table (for Raft) or ``NODE_BFT_SMART_NOTARY_COMMITTED_STATES`` (for BFT).
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Note that in the Raft case the raw data is not human-readable, but we're only interested in the row count for this demo |