gno.land - /r/moul/x/vm/bfdemo/v0

Overview

Package bfdemo is the playground for the guest-VM work: a realm that runs Brainfuck programs on chain, a slice at a time.

It is a demo of two libraries and carries no logic of its own: p/moul/x/vm/bf(/p/moul/x/vm/bf/v0) is the machine, and p/moul/x/vm/vmkit(/p/moul/x/vm/vmkit/v0) is the host ABI, the fuel meter and the instance store.

What it exists to show is the thing gno realm code cannot do for itself: a program that runs out of fuel does not fail, it pauses. The realm keeps the snapshot, and the next caller pays for the next slice. Upload a program, call Step a few times, and watch one computation finish across several transactions.

Function

Upload


              func Upload(cur realm, src, input string, budget int64) string

Upload compiles src and stores it as a new instance, returning its id.

Compilation happens here rather than at the first Step, so an unbalanced program is rejected by the transaction that submitted it instead of costing somebody else the gas later.

Command

# WARNING: This command is running in an INSECURE mode.
# It is strongly recommended to use a hardware device for signing
# and avoid trusting any computer connected to the internet,
# as your private keys could be exposed.

gnokey maketx call -pkgpath "gno.land/r/moul/x/vm/bfdemo/v0" -func "Upload" -args $'' -args $'' -args $'' -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -chainid "gnoland-1" -remote "https://rpc.gno.land" ADDRESSgnokey query -remote "https://rpc.gno.land" auth/accounts/ADDRESS
gnokey maketx call -pkgpath "gno.land/r/moul/x/vm/bfdemo/v0" -func "Upload" -args $'' -args $'' -args $'' -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -broadcast=false ADDRESS > call.tx
gnokey sign -tx-path call.tx -chainid "gnoland-1" -account-number ACCOUNTNUMBER -account-sequence SEQUENCENUMBER ADDRESS
gnokey broadcast -remote "https://rpc.gno.land" call.tx

bfdemo/v0 package

Overview

Function

Upload

Params

Command