17.3. libeufin-sandbox(1)

17.3.1. Name

libeufin-sandbox - Simulate a banking system core with EBICS access to bank accounts

17.3.2. Synopsis

libeufin-sandbox [-h | –help] [–version] COMMAND [ARGS…]

Commands: serve, reset-tables, config, make-transaction, camt053tick default-exchange

17.3.3. Description

libeufin-sandbox is a program to simulate a banking system core with EBICS access to bank accounts. It maintains state in its own private database. You interact with it through HTTP requests either over the network or via a Unix domain socket. Related program libeufin-cli is the preferred front end for that mode of operation. There is also a mode where libeufin-sandbox accepts commands directly, useful for configuring one or more “demobank” (simulated bank) instances.

Its options are as follows:

-h | –help
Print short help on options.
–version
Print version information.

The interaction model is as follows:

  • Configure the sandbox with commands config, default-exchange, make-transaction, and camt053tick.
  • Start the HTTP server with command serve. Let this run in a shell, writing logs to stderr.
  • Point program libeufin-nexus at the sandbox.
  • Interact with libeufin-nexus.
  • When finished, interrupt the serve process and clean up with command reset-tables.

The following sections describe each command in detail.

config

This command takes argument NAME and creates a demobank with that name.

Option --currency CUR (default: EUR) specifes another currency. Option --bank-debt-limit N (default: 1000000) specifies that the bank debt limit should be N (units of currency). Similarly, option --users-debt-limit N (default: 1000) specifies that the users debt limit should be N (units of currency).

For example:

$ libeufin-sandbox config default

This creates the demobank default with currency EUR, bank debt limit 1000000, users debt limit 1000, and allows registrations.

default-exchange

This command sets the exchange that a demobank will suggest to wallets. (Wallets are of course free to disregard the suggestion and choose another exchange.) It requires two arguments, EXCHANGE-BASEURL and EXCHANGE-PAYTO. The option --demobank NAME (default: default) specifies which demobank this setting affects.

For example:

$ libeufin-sandbox default-exchange \
    --demobank bank01 \
    https://exchange.example.com/ \
    payto://iban/CH9300762011623852957

This sets the default exchange for demobank bank01. It is an error if the demobank does not exist.

make-transaction

This is a “legacy” command, useful in a previous iteration of LibEuFin and for internal testing. It creates and records a wire transfer transaction in the database.

It takes two arguments and several required options. The arguments are AMOUNT, in CUR:X.Y format; and SUBJECT, a short textual description of the transaction. The options are: --credit-account LABEL and --debit-account LABEL, where each LABEL names a bank account for receiving and issuing, respectively, the wire transfer. The option --demobank NAME (default: default) specifies in which demobank the wire transfer occurs.

Note

If you have not yet called config, this command creates a demobank named default on its first use. The currency, and bank debt limit have the same defaults as for the config command. The users debt limit, however, defaults to 10000.

FIXME: How to achieve the same result with libeufin-cli?

camt053tick

This command advances the internal time step that the demobank uses to group transactions for reporting. (Successive transactions will be inserted in a new Camt.053 report.)

For example:

$ libeufin-sandbox camt053tick

FIXME: How to achieve the same result with libeufin-cli?

serve

This command starts the HTTP server, listening on port 5000. To use a different port, use option --port INT. To listen, instead, on a Unix domain socket, use option --with-unix-socket PATH. When both --port and --with-unix-socket are given, --with-unix-socket takes precedence.

Note

If you have not yet called config, this command creates a demobank named default on its first use. The currency, and bank debt limit have the same defaults as for the config command. The users debt limit, however, defaults to 10000.

The process runs in the foreground, writing its logs to standard error. The normal log level is DEBUG. To change it, use --log-level LEVEL, where LEVEL is one of: ERROR, WARN, INFO, DEBUG, TRACE.

Before invoking serve, the following environment variables need to be set:

LIBEUFIN_SANDBOX_ADMIN_PASSWORD
The password required for later use by libeufin-cli. For testing purposes, you can use option --no-auth to disable this requirement. (In that case, this environment variable need not be set.)
LIBEUFIN_SANDBOX_DB_CONNECTION

This specifies the database libeufin-sandbox uses to maintain state. Currently, both Sqlite and PostgreSQL are supported. (Only one needs to be specified.) Examples:

  • jdbc:sqlite:/tmp/libeufin-sandbox.db
  • jdbc:postgresql://localhost:5432/libeufindb?user=Foo&password=secret

Normally, the serve command runs until interrupted. When run in a shell, you can use Control-C for that.

reset-tables

This command drops all the tables in the internal database. (The next time the tables are needed, libeufin-sandbox creates them again, automatically.)

It should only be used when the sandbox is quiescent.

17.3.4. See Also

17.3.5. Bugs

Report bugs by using https://bugs.taler.net or by sending electronic mail to <taler@gnu.org>.