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< h1 > Client RPC API< a class = "headerlink" href = "#client-rpc-api" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > In this tutorial we will build a simple command line utility that connects to a node and dumps the transaction graph to
the standard output. We will then put some simple visualisation on top. For an explanation on how the RPC works see
< a class = "reference internal" href = "clientrpc.html" > < span class = "doc" > Client RPC< / span > < / a > .< / p >
< p > We start off by connecting to the node itself. For the purposes of the tutorial we will run the Trader demo on some
local port and connect to the Buyer side. We will pass in the address as a command line argument. To connect to the node
we also need to access the certificates of the node, we will access the node’ s < code class = "docutils literal" > < span class = "pre" > certificates< / span > < / code > directory directly.< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > < span class = "k" > enum< / span > < span class = "k" > class< / span > < span class = "nc" > PrintOrVisualise< / span > < span class = "p" > {< / span >
< span class = "n" > Print< / span > < span class = "p" > ,< / span >
< span class = "n" > Visualise< / span >
< span class = "p" > }< / span >
< span class = "k" > fun< / span > < span class = "nf" > main< / span > < span class = "p" > (< / span > < span class = "n" > args< / span > < span class = "p" > :< / span > < span class = "n" > Array< / span > < span class = "p" > < < / span > < span class = "n" > String< / span > < span class = "p" > > )< / span > < span class = "p" > {< / span >
< span class = "k" > if< / span > < span class = "p" > (< / span > < span class = "n" > args< / span > < span class = "p" > .< / span > < span class = "n" > size< / span > < span class = "p" > < < / span > < span class = "m" > 2< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "k" > throw< / span > < span class = "n" > IllegalArgumentException< / span > < span class = "p" > (< / span > < span class = "s" > " Usage: < binary> < node address> [Print|Visualise]" < / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "k" > val< / span > < span class = "py" > nodeAddress< / span > < span class = "p" > =< / span > < span class = "n" > HostAndPort< / span > < span class = "p" > .< / span > < span class = "n" > fromString< / span > < span class = "p" > (< / span > < span class = "n" > args< / span > < span class = "p" > [< / span > < span class = "m" > 0< / span > < span class = "p" > ])< / span >
< span class = "k" > val< / span > < span class = "py" > printOrVisualise< / span > < span class = "p" > =< / span > < span class = "n" > PrintOrVisualise< / span > < span class = "p" > .< / span > < span class = "n" > valueOf< / span > < span class = "p" > (< / span > < span class = "n" > args< / span > < span class = "p" > [< / span > < span class = "m" > 1< / span > < span class = "p" > ])< / span >
< span class = "k" > val< / span > < span class = "py" > certificatesPath< / span > < span class = "p" > =< / span > < span class = "n" > Paths< / span > < span class = "p" > .< / span > < span class = "k" > get< / span > < span class = "p" > (< / span > < span class = "s" > " build/trader-demo/buyer/certificates" < / span > < span class = "p" > )< / span >
< / pre > < / div >
< / div >
< p > Now we can connect to the node itself:< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > < span class = "k" > val< / span > < span class = "py" > client< / span > < span class = "p" > =< / span > < span class = "n" > CordaRPCClient< / span > < span class = "p" > (< / span > < span class = "n" > nodeAddress< / span > < span class = "p" > ,< / span > < span class = "n" > certificatesPath< / span > < span class = "p" > )< / span >
< span class = "n" > client< / span > < span class = "p" > .< / span > < span class = "n" > start< / span > < span class = "p" > ()< / span >
< span class = "k" > val< / span > < span class = "py" > proxy< / span > < span class = "p" > =< / span > < span class = "n" > client< / span > < span class = "p" > .< / span > < span class = "n" > proxy< / span > < span class = "p" > ()< / span >
< / pre > < / div >
< / div >
< p > < code class = "docutils literal" > < span class = "pre" > proxy< / span > < / code > now exposes the full RPC interface of the node:< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > < span class = "cm" > /**< / span >
< span class = "cm" > * Returns a pair of currently in-progress state machine infos and an observable of future state machine adds/removes.< / span >
< span class = "cm" > */< / span >
< span class = "n" > @RPCReturnsObservables< / span >
< span class = "k" > fun< / span > < span class = "nf" > stateMachinesAndUpdates< / span > < span class = "p" > ():< / span > < span class = "n" > Pair< / span > < span class = "p" > < < / span > < span class = "n" > List< / span > < span class = "p" > < < / span > < span class = "n" > StateMachineInfo< / span > < span class = "p" > > ,< / span > < span class = "n" > Observable< / span > < span class = "p" > < < / span > < span class = "n" > StateMachineUpdate< / span > < span class = "p" > > > < / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * Returns a pair of head states in the vault and an observable of future updates to the vault.< / span >
< span class = "cm" > */< / span >
< span class = "n" > @RPCReturnsObservables< / span >
< span class = "k" > fun< / span > < span class = "nf" > vaultAndUpdates< / span > < span class = "p" > ():< / span > < span class = "n" > Pair< / span > < span class = "p" > < < / span > < span class = "n" > List< / span > < span class = "p" > < < / span > < span class = "n" > StateAndRef< / span > < span class = "p" > < < / span > < span class = "n" > ContractState< / span > < span class = "p" > > > ,< / span > < span class = "n" > Observable< / span > < span class = "p" > < < / span > < span class = "n" > Vault< / span > < span class = "p" > .< / span > < span class = "n" > Update< / span > < span class = "p" > > > < / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * Returns a pair of all recorded transactions and an observable of future recorded ones.< / span >
< span class = "cm" > */< / span >
< span class = "n" > @RPCReturnsObservables< / span >
< span class = "k" > fun< / span > < span class = "nf" > verifiedTransactions< / span > < span class = "p" > ():< / span > < span class = "n" > Pair< / span > < span class = "p" > < < / span > < span class = "n" > List< / span > < span class = "p" > < < / span > < span class = "n" > SignedTransaction< / span > < span class = "p" > > ,< / span > < span class = "n" > Observable< / span > < span class = "p" > < < / span > < span class = "n" > SignedTransaction< / span > < span class = "p" > > > < / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * Returns a snapshot list of existing state machine id - recorded transaction hash mappings, and a stream of future< / span >
< span class = "cm" > * such mappings as well.< / span >
< span class = "cm" > */< / span >
< span class = "n" > @RPCReturnsObservables< / span >
< span class = "k" > fun< / span > < span class = "nf" > stateMachineRecordedTransactionMapping< / span > < span class = "p" > ():< / span > < span class = "n" > Pair< / span > < span class = "p" > < < / span > < span class = "n" > List< / span > < span class = "p" > < < / span > < span class = "n" > StateMachineTransactionMapping< / span > < span class = "p" > > ,< / span > < span class = "n" > Observable< / span > < span class = "p" > < < / span > < span class = "n" > StateMachineTransactionMapping< / span > < span class = "p" > > > < / span >
< span class = "cm" > /**< / span >
< span class = "cm" > * Executes the given command, possibly triggering cash creation etc.< / span >
< span class = "cm" > * TODO: The signature of this is weird because it' s the remains of an old service call, we should have a call for each command instead.< / span >
< span class = "cm" > */< / span >
< span class = "k" > fun< / span > < span class = "nf" > executeCommand< / span > < span class = "p" > (< / span > < span class = "n" > command< / span > < span class = "p" > :< / span > < span class = "n" > ClientToServiceCommand< / span > < span class = "p" > ):< / span > < span class = "n" > TransactionBuildResult< / span >
< / pre > < / div >
< / div >
< p > The one we need in order to dump the transaction graph is < code class = "docutils literal" > < span class = "pre" > verifiedTransactions< / span > < / code > . The type signature tells us that the
RPC will return a list of transactions and an Observable stream. This is a general pattern, we query some data and the
node will return the current snapshot and future updates done to it.< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > val (transactions: List< SignedTransaction> , futureTransactions: Observable< SignedTransaction> ) = proxy.verifiedTransactions()
< / pre > < / div >
< / div >
< p > The graph will be defined by nodes and edges between them. Each node represents a transaction and edges represent
output-input relations. For now let’ s just print < code class = "docutils literal" > < span class = "pre" > NODE< / span > < span class = "pre" > < txhash> < / span > < / code > for the former and < code class = "docutils literal" > < span class = "pre" > EDGE< / span > < span class = "pre" > < txhash> < / span > < span class = "pre" > < txhash> < / span > < / code > for the
latter.< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > < span class = "k" > when< / span > < span class = "p" > (< / span > < span class = "n" > printOrVisualise< / span > < span class = "p" > )< / span > < span class = "p" > {< / span >
< span class = "n" > PrintOrVisualise< / span > < span class = "p" > .< / span > < span class = "n" > Print< / span > < span class = "p" > -> < / span > < span class = "p" > {< / span >
< span class = "n" > futureTransactions< / span > < span class = "p" > .< / span > < span class = "n" > startWith< / span > < span class = "p" > (< / span > < span class = "n" > transactions< / span > < span class = "p" > ).< / span > < span class = "n" > subscribe< / span > < span class = "p" > {< / span > < span class = "n" > transaction< / span > < span class = "p" > -> < / span >
< span class = "n" > println< / span > < span class = "p" > (< / span > < span class = "s" > " NODE ${transaction.id}" < / span > < span class = "p" > )< / span >
< span class = "n" > transaction< / span > < span class = "p" > .< / span > < span class = "n" > tx< / span > < span class = "p" > .< / span > < span class = "n" > inputs< / span > < span class = "p" > .< / span > < span class = "n" > forEach< / span > < span class = "p" > {< / span > < span class = "n" > input< / span > < span class = "p" > -> < / span >
< span class = "n" > println< / span > < span class = "p" > (< / span > < span class = "s" > " EDGE ${input.txhash} ${transaction.id}" < / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
< span class = "n" > CompletableFuture< / span > < span class = "p" > < < / span > < span class = "n" > Unit< / span > < span class = "p" > > ().< / span > < span class = "k" > get< / span > < span class = "p" > ()< / span > < span class = "c1" > // block indefinitely< / span >
< span class = "p" > }< / span >
< / pre > < / div >
< / div >
< p > Now we can start the trader demo as per described in < a class = "reference internal" href = "running-the-demos.html" > < span class = "doc" > Running the demos< / span > < / a > :< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > # Build the demo
./gradlew installDist
# Start the buyer
./build/install/r3prototyping/bin/trader-demo --role=BUYER
< / pre > < / div >
< / div >
< p > In another terminal we can connect to it with our client:< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > # Connect to localhost:31337
./docs/source/example-code/build/install/docs/source/example-code/bin/client-rpc-tutorial localhost:31337 Print
< / pre > < / div >
< / div >
< p > We should see some < code class = "docutils literal" > < span class = "pre" > NODE< / span > < / code > -s printed. This is because the buyer self-issues some cash for the demo.
Unless we ran the seller before we shouldn’ t see any < code class = "docutils literal" > < span class = "pre" > EDGE< / span > < / code > -s because the cash hasn’ t been spent yet.< / p >
< p > In another terminal we can now start the seller:< / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > # Start sellers in a loop
for i in {0..9} ; do ./build/install/r3prototyping/bin/trader-demo --role=SELLER ; done
< / pre > < / div >
< / div >
< p > We should start seeing new < code class = "docutils literal" > < span class = "pre" > NODE< / span > < / code > -s and < code class = "docutils literal" > < span class = "pre" > EDGE< / span > < / code > -s appearing.< / p >
< p > Now let’ s try to visualise the transaction graph. We will use a graph drawing library called < a class = "reference external" href = "http://graphstream-project.org/" > graphstream< / a > < / p >
< div class = "highlight-kotlin" > < div class = "highlight" > < pre > < span > < / span > < span class = "n" > PrintOrVisualise< / span > < span class = "p" > .< / span > < span class = "n" > Visualise< / span > < span class = "p" > -> < / span > < span class = "p" > {< / span >
< span class = "k" > val< / span > < span class = "py" > graph< / span > < span class = "p" > =< / span > < span class = "n" > SingleGraph< / span > < span class = "p" > (< / span > < span class = "s" > " transactions" < / span > < span class = "p" > )< / span >
< span class = "n" > transactions< / span > < span class = "p" > .< / span > < span class = "n" > forEach< / span > < span class = "p" > {< / span > < span class = "n" > transaction< / span > < span class = "p" > -> < / span >
< span class = "n" > graph< / span > < span class = "p" > .< / span > < span class = "n" > addNode< / span > < span class = "p" > < < / span > < span class = "n" > Node< / span > < span class = "p" > > (< / span > < span class = "s" > " ${transaction.id}" < / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "n" > transactions< / span > < span class = "p" > .< / span > < span class = "n" > forEach< / span > < span class = "p" > {< / span > < span class = "n" > transaction< / span > < span class = "p" > -> < / span >
< span class = "n" > transaction< / span > < span class = "p" > .< / span > < span class = "n" > tx< / span > < span class = "p" > .< / span > < span class = "n" > inputs< / span > < span class = "p" > .< / span > < span class = "n" > forEach< / span > < span class = "p" > {< / span > < span class = "n" > ref< / span > < span class = "p" > -> < / span >
< span class = "n" > graph< / span > < span class = "p" > .< / span > < span class = "n" > addEdge< / span > < span class = "p" > < < / span > < span class = "n" > Edge< / span > < span class = "p" > > (< / span > < span class = "s" > " $ref" < / span > < span class = "p" > ,< / span > < span class = "s" > " ${ref.txhash}" < / span > < span class = "p" > ,< / span > < span class = "s" > " ${transaction.id}" < / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
< span class = "n" > futureTransactions< / span > < span class = "p" > .< / span > < span class = "n" > subscribe< / span > < span class = "p" > {< / span > < span class = "n" > transaction< / span > < span class = "p" > -> < / span >
< span class = "n" > graph< / span > < span class = "p" > .< / span > < span class = "n" > addNode< / span > < span class = "p" > < < / span > < span class = "n" > Node< / span > < span class = "p" > > (< / span > < span class = "s" > " ${transaction.id}" < / span > < span class = "p" > )< / span >
< span class = "n" > transaction< / span > < span class = "p" > .< / span > < span class = "n" > tx< / span > < span class = "p" > .< / span > < span class = "n" > inputs< / span > < span class = "p" > .< / span > < span class = "n" > forEach< / span > < span class = "p" > {< / span > < span class = "n" > ref< / span > < span class = "p" > -> < / span >
< span class = "n" > graph< / span > < span class = "p" > .< / span > < span class = "n" > addEdge< / span > < span class = "p" > < < / span > < span class = "n" > Edge< / span > < span class = "p" > > (< / span > < span class = "s" > " ${ref}" < / span > < span class = "p" > ,< / span > < span class = "s" > " ${ref.txhash}" < / span > < span class = "p" > ,< / span > < span class = "s" > " ${transaction.id}" < / span > < span class = "p" > )< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
< span class = "n" > graph< / span > < span class = "p" > .< / span > < span class = "n" > display< / span > < span class = "p" > ()< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
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< p > If we run the client with < code class = "docutils literal" > < span class = "pre" > Visualise< / span > < / code > we should see a simple graph being drawn as new transactions are being created
by the seller runs.< / p >
< p > That’ s it! We saw how to connect to the node and stream data from it.< / p >
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