upload_contract_code.md

Upload Contract Code (WASM)

Warning Please note that Soroban is still under development, so breaking changes may occur.

Note All this actions require to use simulateTransaction and sendTransaction RPC endpoints when specified in the code comments to achieve the contract upload.

alias Stellar.TxBuild.{
  Account,
  BaseFee,
  InvokeHostFunction,
  HostFunction,
  SequenceNumber,
  Signature
}

alias Stellar.Horizon.Accounts
alias Stellar.KeyPair

server = Stellar.Horizon.Server.testnet()

# read file
{:ok, code} = File.read("file_path/file.wasm")

host_function = HostFunction.new(upload_contract_wasm: code)

invoke_host_function_op = InvokeHostFunction.new(host_function: host_function)

keypair = {public_key, _secret} = KeyPair.from_secret_seed("SDR...Q24")

source_account = Account.new(public_key)

{:ok, seq_num} = Accounts.fetch_next_sequence_number(server, public_key)
sequence_number = SequenceNumber.new(seq_num)

signature = Signature.new(keypair)

# Use this XDR to simulate the transaction and get the soroban_data and min_resource_fee
source_account
|> Stellar.TxBuild.new(sequence_number: sequence_number)
|> Stellar.TxBuild.add_operation(invoke_host_function_op)
|> Stellar.TxBuild.envelope()

# Simulate Transaction
soroban_data =
  "AAAAAAAAAAEAAAAHuoVwkiq7sFT5+6wPecWIC3zW3SXzDactjjMN9VUNzQIAAAAAAAAAAAABSTcAAAKUAAAAAAAAAAAAAAAAAAAAAA=="

min_resource_fee = 8800
fee = BaseFee.new(min_resource_fee + 100)

# Use the XDR generated here to send it to the futurenet
source_account
|> Stellar.TxBuild.new(sequence_number: sequence_number)
|> Stellar.TxBuild.add_operation(invoke_host_function_op)
|> Stellar.TxBuild.set_base_fee(fee)
|> Stellar.TxBuild.set_soroban_data(soroban_data)
|> Stellar.TxBuild.sign(signature)
|> Stellar.TxBuild.envelope()