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248 lines
10 KiB
ReStructuredText
248 lines
10 KiB
ReStructuredText
Creating nodes locally
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======================
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.. contents::
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Handcrafting a node
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-------------------
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A node can be created manually by creating a folder that contains the following items:
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* The Corda JAR
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* Can be downloaded from https://r3.bintray.com/corda/net/corda/corda/ (under /VERSION_NUMBER/corda-VERSION_NUMBER.jar)
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* A node configuration file entitled ``node.conf``, configured as per :doc:`corda-configuration-file`
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* A folder entitled ``cordapps`` containing any CorDapp JARs you want the node to load
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* **Optional:** A webserver JAR entitled ``corda-webserver.jar`` that will connect to the node via RPC
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* The (deprecated) default webserver can be downloaded from http://r3.bintray.com/corda/net/corda/corda-webserver/ (under /VERSION_NUMBER/corda-VERSION_NUMBER.jar)
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* A Spring Boot alternative can be found here: https://github.com/corda/spring-webserver
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The remaining files and folders described in :doc:`node-structure` will be generated at runtime.
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The Cordform task
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-----------------
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Corda provides a gradle plugin called ``Cordform`` that allows you to automatically generate and configure a set of
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nodes for testing and demos. Here is an example ``Cordform`` task called ``deployNodes`` that creates three nodes, defined
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in the `Kotlin CorDapp Template <https://github.com/corda/cordapp-template-kotlin/blob/release-V3/build.gradle#L100>`_:
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.. sourcecode:: groovy
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task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['jar']) {
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directory "./build/nodes"
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node {
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name "O=Notary,L=London,C=GB"
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// The notary will offer a validating notary service.
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notary = [validating : true]
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p2pPort 10002
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rpcSettings {
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port 10003
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adminPort 10023
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}
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// No webport property, so no webserver will be created.
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h2Port 10004
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// Starts an internal SSH server providing a management shell on the node.
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sshdPort 2223
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// Includes the corda-finance CorDapp on our node.
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cordapps = ["net.corda:corda-finance:$corda_release_version"]
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// Specify a JVM argument to be used when running the node (in this case, extra heap size).
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extraConfig = [
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jvmArgs : [ "-Xmx1g"]
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]
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}
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node {
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name "O=PartyA,L=London,C=GB"
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p2pPort 10005
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rpcSettings {
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port 10006
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adminPort 10026
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}
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webPort 10007
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h2Port 10008
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cordapps = ["net.corda:corda-finance:$corda_release_version"]
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// Grants user1 all RPC permissions.
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rpcUsers = [[ user: "user1", "password": "test", "permissions": ["ALL"]]]
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}
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node {
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name "O=PartyB,L=New York,C=US"
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p2pPort 10009
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rpcSettings {
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port 10010
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adminPort 10030
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}
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webPort 10011
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h2Port 10012
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cordapps = ["net.corda:corda-finance:$corda_release_version"]
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// Grants user1 the ability to start the MyFlow flow.
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rpcUsers = [[ user: "user1", "password": "test", "permissions": ["StartFlow.net.corda.flows.MyFlow"]]]
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}
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}
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Running this task will create three nodes in the ``build/nodes`` folder:
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* A ``Notary`` node that:
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* Offers a validating notary service
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* Will not have a webserver (since ``webPort`` is not defined)
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* Is running the ``corda-finance`` CorDapp
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* ``PartyA`` and ``PartyB`` nodes that:
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* Are not offering any services
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* Will have a webserver (since ``webPort`` is defined)
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* Are running the ``corda-finance`` CorDapp
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* Have an RPC user, ``user1``, that can be used to log into the node via RPC
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Additionally, all three nodes will include any CorDapps defined in the project's source folders, even though these
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CorDapps are not listed in each node's ``cordapps`` entry. This means that running the ``deployNodes`` task from the
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template CorDapp, for example, would automatically build and add the template CorDapp to each node.
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You can extend ``deployNodes`` to generate additional nodes.
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.. warning:: When adding nodes, make sure that there are no port clashes!
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To extend node configuration beyond the properties defined in the ``deployNodes`` task use the ``configFile`` property with the path (relative or absolute) set to an additional configuration file.
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This file should follow the standard :doc:`corda-configuration-file` format, as per node.conf. The properties from this file will be appended to the generated node configuration. Note, if you add a property already created by the 'deployNodes' task, both properties will be present in the file.
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The path to the file can also be added while running the Gradle task via the ``-PconfigFile`` command line option. However, the same file will be applied to all nodes.
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Following the previous example ``PartyB`` node will have additional configuration options added from a file ``none-b.conf``:
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.. sourcecode:: groovy
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task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['jar']) {
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[...]
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node {
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name "O=PartyB,L=New York,C=US"
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[...]
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// Grants user1 the ability to start the MyFlow flow.
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rpcUsers = [[ user: "user1", "password": "test", "permissions": ["StartFlow.net.corda.flows.MyFlow"]]]
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configFile = "samples/trader-demo/src/main/resources/node-b.conf"
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}
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}
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Cordform parameter `drivers` of the `node` entry lists paths of the files to be copied to the `./drivers` subdirectory of the node.
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To copy the same file to all nodes `ext.drivers` can be defined in the top level and reused for each node via `drivers=ext.drivers``.
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.. sourcecode:: groovy
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task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['jar']) {
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ext.drivers = ['lib/my_common_jar.jar']
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[...]
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node {
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name "O=PartyB,L=New York,C=US"
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[...]
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drivers = ext.drivers + ['lib/my_specific_jar.jar']
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}
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}
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Specifying a custom webserver
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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By default, any node listing a web port will use the default development webserver, which is not production-ready. You
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can use your own webserver JAR instead by using the ``webserverJar`` argument in a ``Cordform`` ``node`` configuration
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block:
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.. sourcecode:: groovy
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node {
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name "O=PartyA,L=New York,C=US"
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webPort 10005
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webserverJar "lib/my_webserver.jar"
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}
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The webserver JAR will be copied into the node's ``build`` folder with the name ``corda-webserver.jar``.
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.. warning:: This is an experimental feature. There is currently no support for reading the webserver's port from the
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node's ``node.conf`` file.
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The Dockerform task
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-------------------
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The ``Dockerform`` is a sister task of ``Cordform`` that provides an extra file allowing you to easily spin up
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nodes using ``docker-compose``. It supports the following configuration options for each node:
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* ``name``
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* ``notary``
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* ``cordapps``
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* ``rpcUsers``
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* ``useTestClock``
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There is no need to specify the nodes' ports, as every node has a separate container, so no ports conflict will occur.
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Every node will expose port ``10003`` for RPC connections.
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The nodes' webservers will not be started. Instead, you should interact with each node via its shell over SSH
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(see the :doc:`node configuration options <corda-configuration-file>`). You have to enable the shell by adding the
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following line to each node's ``node.conf`` file:
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``sshd { port = 2222 }``
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Where ``2222`` is the port you want to open to SSH into the shell.
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Below you can find the example task from the `IRS Demo <https://github.com/corda/corda/blob/release-V3.0/samples/irs-demo/cordapp/build.gradle#L111>`_ included in the samples directory of main Corda GitHub repository:
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.. sourcecode:: groovy
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def rpcUsersList = [
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['username' : "user",
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'password' : "password",
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'permissions' : [
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"StartFlow.net.corda.irs.flows.AutoOfferFlow\$Requester",
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"StartFlow.net.corda.irs.flows.UpdateBusinessDayFlow\$Broadcast",
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"StartFlow.net.corda.irs.api.NodeInterestRates\$UploadFixesFlow",
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"InvokeRpc.vaultQueryBy",
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"InvokeRpc.networkMapSnapshot",
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"InvokeRpc.currentNodeTime",
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"InvokeRpc.wellKnownPartyFromX500Name"
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]]
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]
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// (...)
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task deployNodes(type: net.corda.plugins.Dockerform, dependsOn: ['jar']) {
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node {
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name "O=Notary Service,L=Zurich,C=CH"
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notary = [validating : true]
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cordapps = ["$corda_release_group:corda-finance:$corda_release_version"]
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rpcUsers = rpcUsersList
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useTestClock true
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}
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node {
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name "O=Bank A,L=London,C=GB"
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cordapps = ["$corda_release_group:corda-finance:$corda_release_version"]
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rpcUsers = rpcUsersList
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useTestClock true
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}
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node {
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name "O=Bank B,L=New York,C=US"
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cordapps = ["$corda_release_group:corda-finance:$corda_release_version"]
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rpcUsers = rpcUsersList
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useTestClock true
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}
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node {
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name "O=Regulator,L=Moscow,C=RU"
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cordapps = ["$corda_release_group:corda-finance:$corda_release_version"]
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rpcUsers = rpcUsersList
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useTestClock true
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}
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}
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Running the Cordform/Dockerform tasks
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-------------------------------------
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To create the nodes defined in our ``deployNodes`` task, run the following command in a terminal window from the root
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of the project where the ``deployNodes`` task is defined:
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* Linux/macOS: ``./gradlew deployNodes``
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* Windows: ``gradlew.bat deployNodes``
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This will create the nodes in the ``build/nodes`` folder. There will be a node folder generated for each node defined
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in the ``deployNodes`` task, plus a ``runnodes`` shell script (or batch file on Windows) to run all the nodes at once
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for testing and development purposes. If you make any changes to your CorDapp source or ``deployNodes`` task, you will
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need to re-run the task to see the changes take effect.
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If the task is a ``Dockerform`` task, running the task will also create an additional ``Dockerfile`` in each node
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directory, and a ``docker-compose.yml`` file in the ``build/nodes`` directory.
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You can now run the nodes by following the instructions in :doc:`Running a node <running-a-node>`.
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