Package: sidechain-launch-kit
Sidechain Launch KitIntroductionThis directory contains python scripts to tests and explore side chains.This document walks through the steps to setup a side chain running on your local machine and make your first cross chain transfers.Get ReadyThis section describes how to install the python dependencies, create the environment variables, and create the configuration files that scripts need to run correctly.Install the sidechain launch kitpip install sidechain-launch-kitBuild rippledCheckout thesidechainbranch from therippled repository, and follow the usual process to build rippled.Environment variablesThe python scripts need to know the locations of two files and one directory. These can be specified through command line arguments, by adding variables in the.envfile, or by setting environment variables.The location of the rippled executable used for main chain servers. Either set the environment variableRIPPLED_MAINCHAIN_EXE(in your system or in the.envfile) or use the command line switch--exe_mainchain. Until a new RPC is integrated into the main branch (this will happen very soon), use the code built from the sidechain branch as the main chain exe.The location of the rippled executable used for side chain servers. Either set the environment variableRIPPLED_SIDECHAIN_EXE(in your system or in the.envfile) or use the command line switch--exe_sidechain. This should be the rippled executable built from the sidechain branch.The location of the directory that has the rippled configuration files. Either set the environment variableRIPPLED_SIDECHAIN_CFG_DIR(in your system or in the.envfile) or use the command line switch--cfgs_dir. The configuration files do not exist yet. There is a script to create these for you. For now, just choose a location  where the files should live and make sure that directory exists.The number of federators to have in the sidechain. This must be a number between 1 and 8. Either set the environment variableNUM_FEDERATORS(in your system or in the.envfile) or use the command line switch--num_federators. The script that creates the config files uses this number to create the right config files for that number of federators.Additional environment variables for connecting to mainnet/devnet/testnetThe IP address of a node on the mainchain. Either set the environment variableMAINNET(in your system or in the.envfile) or use the command line switch--mainnet. This is used in both the script that creates the config files and in the script that runs the sidechain.The public Websocket port of the mainchain node. Either set the environment variableMAINNET_PORT(in your system or in the.envfile) or use the command line switch--mainnet_port. This is used in both the script that creates the config files and in the script that runs the sidechain.The seed of the issuer of the cross-chain token. Either set the environment variableIOU_ISSUER(in your system or in the.envfile) or use the command line switch--iou_issuer. This is used in both the script that creates the config files and in the script that runs the sidechain.The seed of the door account on the mainchain. Either set the environment variableDOOR_ACCOUNT_SEED(in your system or in the.envfile) or use the command line switch--door_seed. This is used in the script that creates the config files.Setting environment variables can be very convenient. For example, a small script can be sourced to set these environment variables when working with side chains.Creating configuration filesAssuming rippled is built, the three environment variables are set, and the python environment is activated, run the following script:sidechain-config --assets usdThere should now be many configuration files in the directory specified by theRIPPLED_SIDECHAIN_CFG_DIRenvironment variable. The--assets usdcreates a sample cross chain asset for USD -> USD transfers.Running the interactive shellThere is an interactive shell that can be used to explore side chains. It will use the configuration files built above to spin up test rippled main chain running in standalone mode as well as 5 side chain federators running in regular consensus mode.To start the shell, run the following script:sidechain-shellThe shell will not start until the servers have synced. It may take a minute or two until they do sync. The script should give feedback while it is syncing.Once the shell has started, the following message should appear:Welcome to the sidechain test shell.   Type help or ? to list commands.

SSX>Type the commandserver_infoto make sure the servers are running. An example output would be:SSX> server_info
           pid                                  config  running server_state  ledger_seq complete_ledgers
main 0  136206                   mainchain/rippled.cfg     True    proposing          75             2-75
side 0  136230                 sidechain_0/rippled.cfg     True    proposing          92             1-92
     1  136231                 sidechain_1/rippled.cfg     True    proposing          92             1-92
     2  136232                 sidechain_2/rippled.cfg     True    proposing          92             1-92
     3  136233                 sidechain_3/rippled.cfg     True    proposing          92             1-92
     4  136234                 sidechain_4/rippled.cfg     True    proposing          92             1-92Of course, you'll see slightly different output on your machine. The important thing to notice is there are two categories, one calledmainfor the main chain and one calledsidefor the side chain. There should be a single server for the main chain and five servers for the side chain.Next, type thebalancecommand, to see the balances of the accounts in the address book:SSX> balance
                           balance currency peer limit
     account
main root    99,999,989,999.999985      XRP
     door             9,999.999940      XRP
side door    99,999,999,999.999954      XRPThere are two accounts on the main chain:rootanddoor; and one account on the side chain:door. These are not user accounts. Let's add two user accounts, one on the main chain calledaliceand one on the side chain calledbob. Thenew_accountcommand does this for us.SSX> new_account mainchain alice
SSX> new_account sidechain bobThis just added the accounts to the address book, but they don't exist on the ledger yet. To do that, we need to fund the accounts with a payment. For now, let's just fund thealiceaccount and check the balances. Thepaycommand makes a payment on one of the chains:SSX> pay mainchain root alice 5000
SSX> balance
                           balance currency peer limit
     account
main root    99,999,984,999.999969      XRP
     door             9,999.999940      XRP
     alice            5,000.000000      XRP
side door    99,999,999,999.999954      XRP
     bob                  0.000000      XRPFinally, let's do something specific to side chains: make a cross chain payment. Thexchaincommand makes a payment between chains:SSX> xchain mainchain alice bob 4000
SSX> balance
                           balance currency peer limit
     account
main root    99,999,984,999.999969      XRP
     door            13,999.999940      XRP
     alice              999.999990      XRP
side door    99,999,995,999.999863      XRP
     bob              4,000.000000      XRPNote: the account reserve on the side chain is 100 XRP. The cross chain amount must be greater than 100 XRP or the payment will fail.Making a cross chain transaction from the side chain to the main chain is similar:SSX> xchain sidechain bob alice 2000
SSX> balance
                           balance currency peer limit
     account
main root    99,999,984,999.999969      XRP
     door            11,999.999840      XRP
     alice            2,999.999990      XRP
side door    99,999,997,999.999863      XRP
     bob              1,999.999990      XRPIf you typedbalancevery quickly, you may catch a cross chain payment in progress and the XRP may be deducted from bob's account before it is added to alice's. If this happens just wait a couple seconds and retry the command. Also note that accounts pay a ten drop fee when submitting transactions.Finally, exit the program with thequitcommand:SSX> quit
Thank you for using the sidechain shell. Goodbye.


WARNING: Server 0 is being stopped. RPC commands cannot be sent until this is restarted.Ignore the warning about the server being stopped.ConclusionThose two cross chain payments are a "hello world" for side chains. It makes sure you're environment is set up correctly.