Soroban.ex

Soroban.ex is an open source library for Elixir to interact with the Soroban-RPC server, and facilitate the deployment and invocation of Soroban smart contracts.

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

Installation

Available in Hex, add soroban to your list of dependencies in mix.exs:

def deps do
  [
    {:soroban, "~> 0.20.1"}
  ]
end

Documentation

Soroban.ex is made up of three components:

• Types: Soroban types that can be utilized as function arguments when invoking a smart contract.
• RPC: Interface to interact with the Soroban-RPC server.
• Contract: Deploy and invoke Soroban smart contracts with ease. No need to worry about transaction building.

Types

The Soroban.Types context defines a comprehensive set of types that are crucial since they can be utilized as function arguments when invoking a smart contract.

The types provided by Soroban.ex aim to replicate the experience of working with types in smart contract development. They range from scalar types (such as Bool, Int32, etc.) to compound types (such as Map, Struct, Tuple, etc.).

Bool

Soroban.Types.Bool.new(true)
Soroban.Types.Bool.new(false)

Integers

These types include signed integers (Int32, Int64, Int128, Int256) and unsigned integers (UInt32, UInt64, UInt128, UInt256).

Soroban.Types.Int32.new(1)
Soroban.Types.Int64.new(1)
Soroban.Types.Int128.new(1)
Soroban.Types.Int256.new(1)

Soroban.Types.UInt32.new(1)
Soroban.Types.UInt64.new(1)
Soroban.Types.UInt128.new(1)
Soroban.Types.UInt256.new(1)

TimePoint

Soroban.Types.TimePoint.new(12_345)

Duration

Soroban.Types.Duration.new(12_345)

Bytes

# From raw bytes
Soroban.Types.Bytes.new(<<1, 2, 3>>)

# From string
Soroban.Types.Bytes.new("Hello World!")

Symbol

Soroban.Types.Symbol.new("symbol")

String

Soroban.Types.String.new("Hello World!")

Address

# Account address
Soroban.Types.Address.new("GB6FIXFOEK46VBDAG5USXRKKDJYFOBQZDMAPOYY6MC4KMRTSPVUH3X2A")

# Contract address
Soroban.Types.Address.new("CCEMOFO5TE7FGOAJOA3RDHPC6RW3CFXRVIGOFQPFE4ZGOKA2QEA636SN")

Option

Option is a type that represents an optional value. It can hold any Soroban.Types type.

# When the value is not present
Soroban.Types.Option.new()

# When the value is present
100
|> Soroban.Types.UInt32.new()
|> Soroban.Types.Option.new()

Vec

Vec is a type that represents a vector of values. It can hold any Soroban.Types type as long as all the values are of the same type.

values = [
  Soroban.Types.Symbol.new("A"),
  Soroban.Types.Symbol.new("B"),
  Soroban.Types.Symbol.new("C")
]

Soroban.Types.Vec.new(values)

Tuple

Tuple is a type that represents a tuple of values. It can hold any Soroban.Types type.

alias Soroban.Types.{Tuple, Symbol, Int32}

values = [Symbol.new("A"), Symbol.new("B"), Int32.new(1)]

Tuple.new(values)

Map

Map is a type that represents a map of key-value pairs. It can hold any Soroban.Types type as key and value.

alias Soroban.Types.{Map, MapEntry, Symbol, UInt32, Bool}

key1 = Symbol.new("key1")
value1 = UInt32.new(100)
entry1 = MapEntry.new({key1, value1})

key2 = Symbol.new("key2")
value2 = Bool.new(true)
entry2 = MapEntry.new({key2, value2})

Map.new([entry1, entry2])

Enum

The Enum type supports both unit and tuple variants. More info can be found here.

alias Soroban.Types.{Enum, UInt32}

# Unit variant
Enum.new("A")

# Tuple variant
Enum.new({"B", UInt32.new(100)})

Struct

Struct is a type that represents a custom struct. It can hold any Soroban.Types type.

alias Soroban.Types.{Struct, StructField, UInt32, Address}

key1 = "key1"
value1 = UInt32.new(100)
field1 = StructField.new({key1, value1})

key2 = "key2"
value2 = Address.new("GB6FIXFOEK46VBDAG5USXRKKDJYFOBQZDMAPOYY6MC4KMRTSPVUH3X2A")
field2 = StructField.new({key2, value2})

Struct.new([field1, field2])

Soroban RPC endpoints

Interaction with the Soroban-RPC server is done through the Soroban.RPC module.

Server

To interact with the Soroban-RPC server, it is required to create a Soroban-RPC server struct.

# with a custom URL
Soroban.RPC.Server.new("https://soroban-testnet.stellar.org")

Soroban.RPC.Server.testnet() # https://soroban-testnet.stellar.org

Soroban.RPC.Server.futurenet() # https://rpc-futurenet.stellar.org

Soroban.RPC.Server.local() # http://localhost:8000

Simulate Transaction

Submit a trial contract invocation to get back return values, expected ledger footprint, and expected costs.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• params: Parameters to simulate the transaction:
  • transaction: <xdr.TransactionEnvelope> - The transaction to be simulated (serialized in base64).
  • addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
    • cpu_instructions: Number of additional CPU instructions to reserve.

Example

server = Soroban.RPC.Server.testnet()
base64_envelope =
  "AAAAAgAAAADWKIRtrzg/aTCtUHeZnpyYu0iNxJxcn4tr0jXG2hOIlwAAAGQABzbWAAAAAwAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAGAAAAAAAAAAEAAAADQAAACC8xDySpTRgcsckFZY9QBvIP3LL70Jp0xG3cmpCvp0d/QAAAA8AAAAJaW5jcmVtZW50AAAAAAAAEwAAAAAAAAAA1iiEba84P2kwrVB3mZ6cmLtIjcScXJ+La9I1xtoTiJcAAAADAAAACgAAAAAAAAAAAAAAAQAAAAC8xDySpTRgcsckFZY9QBvIP3LL70Jp0xG3cmpCvp0d/QAAAAlpbmNyZW1lbnQAAAAAAAACAAAAEwAAAAAAAAAA1iiEba84P2kwrVB3mZ6cmLtIjcScXJ+La9I1xtoTiJcAAAADAAAACgAAAAAAAAAAAAAAAAAAAAA="

addl_resources = [cpu_instructions: 100]

Soroban.RPC.simulate_transaction(server, transaction: base64_envelope, addl_resources: addl_resources)

{:ok,
 %Soroban.RPC.SimulateTransactionResponse{
   results: [
     %{
       auth: nil,
       events: nil,
       footprint:
         "AAAAAgAAAAYU0EuZrCKggMgcYHtwMuiHqnrYwhksO17kfjwJ8h2l3QAAABQAAAAHCoKrtqgxTcxBJ+F9JX+3Gvlw3NtYGwCu8hzxUsbupwIAAAAA",
       xdr: "AAAAEAAAAAEAAAACAAAADwAAAAVIZWxsbwAAAAAAAA8AAAAFd29ybGQAAAA="
     }
   ],
   cost: %{cpu_insns: "1048713", mem_bytes: "1201148"},
   latest_ledger: 45075181,
   restore_preamble: nil,
   error: nil
 }}

Send Transaction

Submit a real transaction to the Stellar network. This is the only way to make changes "on-chain".

Unlike Horizon, this does not wait for transaction completion. It simply validates and enqueues the transaction. Clients should call Get Transaction to learn about transaction success/failure.

This supports all transactions, not only smart contract-related transactions.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• base64_envelope: <xdr.TransactionEnvelope> - The signed transaction to broadcast (serialized in base64).

Example

server = Soroban.RPC.Server.testnet()
base64_envelope =
  "AAAAAgAAAADBPp7TMinJylnn+6dQXJACNc15LF+aJ2Py1BaR4P10JAAAAGQAAFBfAAAAIQAAAAEAAAAAAAAAAAAAAABkUtg3AAAAAAAAAAEAAAABAAAAAME+ntMyKcnKWef7p1BckAI1zXksX5onY/LUFpHg/XQkAAAAGAAAAAAAAAADAAAADQAAACAU0EuZrCKggMgcYHtwMuiHqnrYwhksO17kfjwJ8h2l3QAAAA8AAAAFaGVsbG8AAAAAAAAPAAAABXdvcmxkAAAAAAAAAgAAAAYU0EuZrCKggMgcYHtwMuiHqnrYwhksO17kfjwJ8h2l3QAAABQAAAAHCoKrtqgxTcxBJ+F9JX+3Gvlw3NtYGwCu8hzxUsbupwIAAAAAAAAAAAAAAAAAAAAB4P10JAAAAEDS4+hvSG1JqhOIPaGSqUerNsjhIcS+AwWhH/K8IOafcmMlZJoyZvMftV1QcdWA/LQhr2QJRTWNT6I52/eTP3IH"

Soroban.RPC.send_transaction(server, base64_envelope)

{:ok,
 %Soroban.RPC.SendTransactionResponse{
   status: "PENDING",
   hash: "a4721e2a61e9a6b3f54030396e41c3e352101e6cd649b4453e89fb3e827744f4",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1683150612",
   error_result_xdr: nil,
   diagnostic_events_xdr: nil
 }}

Get Transaction

Clients will poll this to tell when the transaction has been completed.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• hash: Transaction hash to query, as a hex-encoded string.

Example

server = Soroban.RPC.Server.testnet()
hash = "a4721e2a61e9a6b3f54030396e41c3e352101e6cd649b4453e89fb3e827744f4"

Soroban.RPC.get_transaction(server, hash)

{:ok,
 %Soroban.RPC.GetTransactionResponse{
   status: "SUCCESS",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1683151229",
   oldest_ledger: 475097,
   oldest_ledger_close_time: "1683143656",
   application_order: 1,
   envelope_xdr:
     "AAAAAgAAAADBPp7TMinJylnn+6dQXJACNc15LF+aJ2Py1BaR4P10JAAAAGQAAFBfAAAAIQAAAAEAAAAAAAAAAAAAAABkUtg3AAAAAAAAAAEAAAABAAAAAME+ntMyKcnKWef7p1BckAI1zXksX5onY/LUFpHg/XQkAAAAGAAAAAAAAAADAAAADQAAACAU0EuZrCKggMgcYHtwMuiHqnrYwhksO17kfjwJ8h2l3QAAAA8AAAAFaGVsbG8AAAAAAAAPAAAABXdvcmxkAAAAAAAAAgAAAAYU0EuZrCKggMgcYHtwMuiHqnrYwhksO17kfjwJ8h2l3QAAABQAAAAHCoKrtqgxTcxBJ+F9JX+3Gvlw3NtYGwCu8hzxUsbupwIAAAAAAAAAAAAAAAAAAAAB4P10JAAAAEDS4+hvSG1JqhOIPaGSqUerNsjhIcS+AwWhH/K8IOafcmMlZJoyZvMftV1QcdWA/LQhr2QJRTWNT6I52/eTP3IH",
   result_xdr:
     "AAAAAAAAAGQAAAAAAAAAAQAAAAAAAAAYAAAAAAAAABAAAAABAAAAAgAAAA8AAAAFSGVsbG8AAAAAAAAPAAAABXdvcmxkAAAAAAAAAA==",
   result_meta_xdr:
     "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",
   ledger: 476421
 }}

Get Health

General node health check.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.

Example

server = Soroban.RPC.Server.testnet()
Soroban.RPC.get_health(server)

{:ok, %Soroban.RPC.GetHealthResponse{status: "healthy"}}

Get Latest Ledger

For finding out the current latest known ledger of this node. This is a subset of the ledger info from Horizon.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.

Example

server = Soroban.RPC.Server.testnet()
Soroban.RPC.get_latest_ledger(server)

{:ok,
 %Soroban.RPC.GetLatestLedgerResponse{
   id: "2a00000000000000000000000000000000000000000000000000000000000000",
   protocol_version: 20,
   sequence: 666
 }}

Get Network

General info about the currently configured network.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.

Example

server = Soroban.RPC.Server.testnet()
Soroban.RPC.get_network(server)

{:ok,
 %Soroban.RPC.GetNetworkResponse{
   friendbot_url: "https://friendbot-futurenet.stellar.org/",
   passphrase: "Test SDF Future Network ; October 2022",
   protocol_version: "20"
 }}

Get Ledger Entries

For reading the current value of ledger entries directly.

Allows you to directly inspect the current state of a contract, a contract's code, or any other ledger entry. This is a backup way to access your contract data which may not be available via events or simulateTransaction.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• keys: <xdr.LedgerKey[]> - Array containing the keys of the ledger entries you wish to retrieve (an array of serialized base64 strings).

Example

server = Soroban.RPC.Server.testnet()
keys = ["AAAABvrOGFv9hxq4ke1yjqrbfSQPrggCrdo12YvueQldm8h8AAAADwAAAAdDT1VOVEVSAA=="]

Soroban.RPC.get_ledger_entries(server, keys)

{:ok,
 %GetLedgerEntriesResponse{
   entries: [
     %{
       key: "AAAAB+qfy4GuVKKfazvyk4R9P9fpo2n9HICsr+xqvVcTF+DC",
       xdr: "AAAABwAAAADqn8uBrlSin2s78pOEfT/X6aNp/RyArK/sar1XExfgwgAAAAphIGNvbnRyYWN0AAA=",
       last_modified_ledger_seq: 13,
       live_until_ledger_seq: 320384
     }
   ],
   latest_ledger: 45075181
 }}

Get Events

Clients can request a filtered list of events emitted by a given ledger range.

Soroban-RPC will support querying within a maximum 24 hours of recent ledgers.

Note: This could be used by the client to only prompt a refresh when there is a new ledger with relevant events. It should also be used by backend Dapp components to "ingest" events into their own database for querying and serving.

If making multiple requests, clients should deduplicate any events received, based on the event's unique id field. This prevents double-processing in the case of duplicate events being received.

By default soroban-rpc retains the most recent 24 hours of events.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.

• EventsPayload:

  • start_ledger: Stringified ledger sequence number to fetch events after (inclusive). This method will return an error if start_ledger is less than the oldest ledger stored in this node, or greater than the latest ledger seen by this node. If a cursor is included in the request, start_ledger must be omitted.

  • cursor: (optional) A string ID that points to a specific location in a collection of responses and is pulled from the paging_token value of a record. When a cursor is provided Soroban-RPC will not include the element whose id matches the cursor in the response. Only elements which appear after the cursor are included.

  • limit: (optional) The maximum number of records returned. The limit for getEvents can range from 1 to 10000 - an upper limit that is hardcoded in Soroban-RPC for performance reasons. If this argument isn't designated, it defaults to 100.

  • filters: List of EventFilter for the returned events. Events matching any of the filters are included. To match a filter, an event must match both a contractId and a topic. Maximum 5 filters are allowed per request.

    • type: (optional) A list of event types (:system, :contract, or :diagnostic) used to filter events. If omitted, all event types are included.
    • contract_ids: (optional) List of contract ids to query for events. If omitted, return events for all contracts. Maximum 5 contract IDs are allowed per request.
    • topics: (optional) List of TopicFilter. If omitted, query for all events. If multiple filters are specified, events will be included if they match any of the filters. Maximum 5 filters are allowed per request.
      • TopicFilter: is a SegmentMatcher[]. The list can be 1-4 SegmentMatchers long.
      • SegmentMatcher:
        • For an exact segment match, use Soroban.ex Types that will be converted into string base64-encoded ScVal values.
        • For a wildcard single-segment match, the string "*", matches exactly one segment.
      • E.g: [Symbol.new("transfer"), "*", "*", "*"]

Example

alias Soroban.RPC.{
  EventsPayload,
  EventFilter,
  TopicFilter
}

alias Soroban.Types.Symbol

server = Soroban.RPC.Server.testnet()

limit = 1
start_ledger = "674736"
args = [Symbol.new("transfer"), "*", "*", "*"]
topic_filter = [TopicFilter.new(args)]
contract_ids = ["CCEMOFO5TE7FGOAJOA3RDHPC6RW3CFXRVIGOFQPFE4ZGOKA2QEA636SN"]

filters = [
  EventFilter.new(type: [:contract], contract_ids: contract_ids, topics: topic_filter)
]

events_payload =
  EventsPayload.new(
    start_ledger: start_ledger,
    filters: filters,
    limit: limit
  )

Soroban.RPC.get_events(server, events_payload)

{:ok,
 %Soroban.RPC.GetEventsResponse{
   latest_ledger: 45075181,
   events: [
     %{
       contract_id: "CCEMOFO5TE7FGOAJOA3RDHPC6RW3CFXRVIGOFQPFE4ZGOKA2QEA636SN",
       id: "0002917807507378176-0000000000",
       in_successful_contract_call: true,
       ledger: 679355,
       ledger_closed_at: "2023-05-16T06:02:47Z",
       paging_token: "0002917807507378176-0000000000",
       topic: [
         "AAAADwAAAAh0cmFuc2Zlcg==",
         "AAAAEwAAAAAAAAAAVAw2XIf/C6hPQZ2EgaY6R7RKuLfchP7836ZvBjZxdVY=",
         "AAAAEwAAAAG2UFHmWnQeBKU73RLX7AQKCktEUE/F/bKqVy+ejoC/YQ==",
         "AAAADQAAACVVU0RDOl3dfLGIo7lPPO+E0KPPSVxWCQ1qOen8umo/g+Jx8baEAAAA"
       ],
       type: "contract",
       value: "AAAACgAAAAAF9eEAAAAAAAAAAAA="
     }
   ]
 }}

Deploy and Invoke Soroban smart contracts

The deployment and invocation of Soroban smart contracts is done through the Soroban.Contract module which provides convenient functions that streamline the process.

Invoke contract function

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• contract_address: Identifier of the contract to be invoked, encoded as StrKey.
• source_secret_key: Secret key of the function invoker responsible for signing the transaction.
• function_name: String indicating the name of the function to be invoked.
• function_args: List of Soroban.Types representing the arguments required by the indicated function (function_name). They should be provided in the specific order expected by the function.
• auth_secret_key: (optional) Secret key used to authorize the function invocation when the function invoker is not the same function authorizer.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

Simple invocation - no authorization required

alias Soroban.Contract
alias Soroban.Types.String

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
source_secret_key = "SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK"
function_name = "hello"

function_args = [String.new("world")]

addl_resources = [cpu_instructions: 100]

Contract.invoke(server, network_passphrase, contract_address, source_secret_key, function_name, function_args, [], addl_resources)

{:ok,
  %Soroban.RPC.SendTransactionResponse{
    status: "PENDING",
    hash: "f62cb9e20c6d297316f49dca2041be4bf1af6b069c784764e51ac008b313d716",
    latest_ledger: 45075181,
    latest_ledger_close_time: "1683643419",
    error_result_xdr: nil,
    diagnostic_events_xdr: nil
  }}

Invocation with required authorization

• When the function invoker authorizes the function invocation

  alias Soroban.Contract
  alias Soroban.Types.{Address, UInt128}
  
  server = Soroban.RPC.Server.testnet()
  network_passphrase = Stellar.Network.testnet_passphrase()
  contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
  source_secret_key = "SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK"
  function_name = "inc"
  
  function_args = [
    Address.new("GDEU46HFMHBHCSFA3K336I3MJSBZCWVI3LUGSNL6AF2BW2Q2XR7NNAPM"),
    UInt128.new(2)
  ]
  
  addl_resources = [cpu_instructions: 100]
  
  Contract.invoke(
    server,
    network_passphrase,
    contract_address,
    source_secret_key,
    function_name,
    function_args,
    [],
    addl_resources
  )
  
  {:ok,
    %Soroban.RPC.SendTransactionResponse{
      status: "PENDING",
      hash: "e888193b4fed9b3ca6ad2beca3c1ed5bef3e0099e558756de85d03511cbaa00b",
      latest_ledger: 45075181,
      latest_ledger_close_time: "1683643728",
      error_result_xdr: nil,
      diagnostic_events_xdr: nil
    }}

• When the function invoker is not the function authorizer.

  Note This operation will not succeed if one of the auth_secret_keys is the same as the source_secret_key, because the simulate_transaction will return that auth as a SOROBAN_CREDENTIALS_SOURCE_ACCOUNT type.

  alias Soroban.Contract
  alias Soroban.Types.{Address, Int128}
  
  server = Soroban.RPC.Server.testnet()
  network_passphrase = Stellar.Network.testnet_passphrase()
  contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
  source_secret_key = "SDRD4CSRGPWUIPRDS5O3CJBNJME5XVGWNI677MZDD4OD2ZL2R6K5IQ24"
  function_name = "swap"
  
  function_args = [
    Address.new("GDEU46HFMHBHCSFA3K336I3MJSBZCWVI3LUGSNL6AF2BW2Q2XR7NNAPM"),
    Address.new("GDAH3LPNC32U2HLJ4UKDSG2HSJN65XTMZKAZII4Z4NOAFFWJTI2PUN5W"),
    Int128.new(100),
    Int128.new(4500)
  ]
  
  auth_secret_keys = [
    "SCAVFA3PI3MJLTQNMXOUNBSEUOSY66YMG3T2KCQKLQBENNVLVKNPV3EK",
    "SDLOYUOMX67YX6NK7TZLWTGYU3V4FIEBL5RFRX36EYDZ4OM46VSJXV7C"
  ]
  
  addl_resources = [cpu_instructions: 100]
  
  Contract.invoke(
    server,
    network_passphrase,
    contract_address,
    source_secret_key,
    function_name,
    function_args,
    auth_secret_keys,
    addl_resources
  )
  
  {:ok,
    %Soroban.RPC.SendTransactionResponse{
      status: "PENDING",
      hash: "da263f59a8f8b29f415e7e26758cad6e8d88caec875112641b88757ce8e01873",
      latest_ledger: 45075181,
      latest_ledger_close_time: "1683644240",
      error_result_xdr: nil,
      diagnostic_events_xdr: nil
    }}

Deploy contracts

Upload Contract Code

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• wasm: Binary of the web assembly (WASM) file resulting from building the contract.
• secret_key: Secret key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.Contract.UploadContractCode
alias Soroban.RPC
alias Soroban.RPC.SendTransactionResponse

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
wasm = File.read!("../your_wasm_path/hello.wasm")
secret_key = "SCA..."
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} = Contract.upload(
  server,
  network_passphrase,
  wasm,
  secret_key,
  addl_resources
)

{:ok,
  %Soroban.RPC.SendTransactionResponse{
    status: "PENDING",
    hash: "65d...",
    latest_ledger: 45075181,
    latest_ledger_close_time: "16",
    error_result_xdr: nil,
    diagnostic_events_xdr: nil
  }}

Deploy Contract from WASM

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• wasm_id: Binary identification of the uploaded contract to deploy.
• secret_key: Secret key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse
alias Soroban.Contract.DeployContract

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
wasm_id = <<187, 187, 69, ...>>
secret_key = "SCA..."
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} = Contract.deploy(
  server,
  network_passphrase,
  wasm_id,
  secret_key,
  addl_resources
)

{:ok,
  %Soroban.RPC.SendTransactionResponse{
    status: "PENDING",
    hash: "f95...",
    latest_ledger: 45075181,
    latest_ledger_close_time: "16",
    error_result_xdr: nil,
    diagnostic_events_xdr: nil
  }}

Deploy Asset Contract

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• asset_code: String from 1 to 12 characters indicating the asset symbol.
• asset_issuer: Public key of the asset issuer.
• secret_key: Secret key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse
alias Soroban.Contract.DeployAssetContract

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
asset_code = "DBZ"
asset_issuer = "GBL..."
secret_key = "SCA..."
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} = Contract.deploy_asset(
  server,
  network_passphrase,
  asset_code,
  asset_issuer,
  secret_key,
  addl_resources
)

{:ok,
%Soroban.RPC.SendTransactionResponse{
  status: "PENDING",
  hash: "b667...",
  latest_ledger: 45075181,
  latest_ledger_close_time: "16",
  error_result_xdr: nil,
  diagnostic_events_xdr: nil
}}

ExtendFootprintTTL operation

Extend contract

Extends a contract instance lifetime.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• contract_address: Identifier of the contract to be extended, encoded as StrKey.
• source_secret_key: Secret key of the function invoker responsible for signing the transaction.
• ledgers_to_extend: The number of ledgers wanted to extend the contract lifetime.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
secret_key = "SDRD4CSRGPWUIPRDS5O3CJBNJME5XVGWNI677MZDD4OD2ZL2R6K5IQ24"
ledgers_to_extend = 100_000
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} =
  Contract.extend_contract(
    server,
    network_passphrase,
    contract_address,
    secret_key,
    ledgers_to_extend,
    addl_resources
  )

{:ok,
 %Soroban.RPC.SendTransactionResponse{
   status: "PENDING",
   hash: "2f6f...",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1691441432",
   error_result_xdr: nil,
   diagnostic_events_xdr: nil
}}

Extend contract wasm

Extends the lifetime of a contract's uploaded wasm code.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• wasm_id: Binary identification of an uploaded contract.
• source_secret_key: Secret key of the function invoker responsible for signing the transaction.
• ledgers_to_extend: The number of ledgers wanted to extend the wasm lifetime.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
wasm_id = "067eb7ba419edd3e946e08eb17a81fbe1e850e690ed7692160875c2b65b45f21"
secret_key = "SDRD4CSRGPWUIPRDS5O3CJBNJME5XVGWNI677MZDD4OD2ZL2R6K5IQ24"
ledgers_to_extend = 100_000
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} =
  Contract.extend_contract_wasm(
    server,
    network_passphrase,
    wasm_id,
    secret_key,
    ledgers_to_extend,
    addl_resources
  )

{:ok,
 %Soroban.RPC.SendTransactionResponse{
   status: "PENDING",
   hash: "2f6f...",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1691441432",
   error_result_xdr: nil,
   diagnostic_events_xdr: nil
}}

Extend contract keys

Extends the lifetime of a contract's data entry keys.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• contract_address: Identifier of the contract to be extended, encoded as StrKey.
• source_secret_key: Secret key of the function invoker responsible for signing the transaction.
• ledgers_to_extend: The number of ledgers wanted to extend the contract lifetime.
• keys: A list of tuples indicating the durability and the name of the data entry, to increase its lifetime.
  • durability: Allowed types :persistent, :temporary
  • data entry: Any String that is 32 characters or less.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
secret_key = "SDRD4CSRGPWUIPRDS5O3CJBNJME5XVGWNI677MZDD4OD2ZL2R6K5IQ24"
ledgers_to_extend = 100_000
keys =  [{:persistent, "Prst"}, {:temporary, "Tmp"}]
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} =
  Contract.extend_contract_keys(
    server,
    network_passphrase,
    contract_address,
    secret_key,
    ledgers_to_extend,
    keys,
    addl_resources
  )

{:ok,
 %Soroban.RPC.SendTransactionResponse{
   status: "PENDING",
   hash: "2f6f...",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1691441432",
   error_result_xdr: nil,
   diagnostic_events_xdr: nil
}}

RestoreFootprint operation

Restore contract

Restores a contract instance.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• contract_address: Identifier of the contract to be restored, encoded as StrKey.
• source_secret_key: Secret key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
secret_key = "SDRD4CSRGPWUIPRDS5O3CJBNJME5XVGWNI677MZDD4OD2ZL2R6K5IQ24"
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} =
  Contract.restore_contract(
    server,
    network_passphrase,
    contract_address,
    secret_key,
    addl_resources
  )

{:ok,
 %Soroban.RPC.SendTransactionResponse{
   status: "PENDING",
   hash: "eedb...",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1691523150",
   error_result_xdr: nil,
   diagnostic_events_xdr: nil
 }}

Restore contract wasm

Restores a contract uploaded wasm code.

Note: When restoring a contract wasm make sure the contract wasn't re-uploaded, because the transaction could succeed but, since the wasm_id changed, the restored one will continue not working.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• wasm_id: Binary identification of an uploaded contract.
• source_secret_key: Secret key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
wasm_id = "067eb7ba419edd3e946e08eb17a81fbe1e850e690ed7692160875c2b65b45f21"
secret_key = "SDRD4CSRGPWUIPRDS5O3CJBNJME5XVGWNI677MZDD4OD2ZL2R6K5IQ24"
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} = Contract.restore_contract_wasm(
  server,
  network_passphrase,
  wasm_id,
  secret_key,
  addl_resources
)

{:ok,
 %Soroban.RPC.SendTransactionResponse{
   status: "PENDING",
   hash: "eedb...",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1691523689",
   error_result_xdr: nil,
   diagnostic_events_xdr: nil
 }}

Restore contract keys

Restore contract's data entry keys.

Note: Only persistent data entries are allowed because temporary entries cannot be restored as they are permanently deleted when they expire.

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• contract_address: Identifier of the contract to be restored, encoded as StrKey.
• source_secret_key: Secret key of the function invoker responsible for signing the transaction.
• keys: A keyword list indicating the durability and the name of the data entry, to restore.
  • durability: Allowed types :persistent
  • data entry: Any String that is 32 characters or less.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.RPC.SendTransactionResponse

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
secret_key = "SDRD4CSRGPWUIPRDS5O3CJBNJME5XVGWNI677MZDD4OD2ZL2R6K5IQ24"
keys =  [persistent: ["Prst"]]
addl_resources = [cpu_instructions: 100]

{:ok, %SendTransactionResponse{hash: hash}} =
  Contract.restore_contract_keys(
    server,
    network_passphrase,
    contract_address,
    secret_key,
    keys,
    addl_resources
  )

{:ok,
 %Soroban.RPC.SendTransactionResponse{
   status: "PENDING",
   hash: "0521...",
   latest_ledger: 45075181,
   latest_ledger_close_time: "1691524532",
   error_result_xdr: nil,
   diagnostic_events_xdr: nil
 }}

Retrieve unsigned Transaction Envelope XDR

In order to facilitate seamless integration with wallets, we have developed functions that enable the retrieval of the unsigned Transaction Envelope XDR for each type of interaction with contracts: invocation, upload, and deployment.

This XDR is required by wallets to sign transactions before they can be submitted to the network. Once the wallet returns the signed XDR, the Soroban.RPC.send_transaction/1 function can be used to submit the transaction.

Invoke contract function

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• contract_address: Identifier of the contract to be invoked, encoded as StrKey.
• source_public_key: Public key of the function invoker responsible for signing the transaction.
• function_name: String value indicating the name of the function to be invoked.
• function_args: List of Soroban.Types representing the arguments required by the indicated function (function_name). They should be provided in the specific order expected by the function.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract
alias Soroban.Types.String

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
contract_address = "CAEYZ6JI5YV2CBI3NRRUNA2DMERJ4KLJTI76WDZBTWZ7VMPGY6JDIZD5"
source_public_key = "GDEU46HFMHBHCSFA3K336I3MJSBZCWVI3LUGSNL6AF2BW2Q2XR7NNAPM"
function_name = "hello"

function_args = [String.new("world")]

addl_resources = [cpu_instructions: 100]

Contract.retrieve_unsigned_xdr_to_invoke(
  server,
  network_passphrase,
  contract_address,
  source_public_key,
  function_name,
  function_args,
  addl_resources
)

"AAAAAgAAAAD...QAAAAAAAAAAAAAAAAAAAAA="

Install contract code

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• wasm: Binary of the web assembly (WASM) file resulting from building the contract.
• source_public_key: Public key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
wasm = File.read!("../your_wasm_path/hello.wasm")
source_public_key = "GDEU46HFMHBHCSFA3K336I3MJSBZCWVI3LUGSNL6AF2BW2Q2XR7NNAPM"
addl_resources = [cpu_instructions: 100]

Contract.retrieve_unsigned_xdr_to_upload(
  server,
  network_passphrase,
  wasm,
  source_public_key,
  addl_resources
)

"AAAAAgAAAABaOyGfG/GU6itO0ElcKHcFqVS+fbN5bGtw0yDCwWKx2gAAAGQAADg8AAAAOgAAAAAAAAAAAAAAAQAAAAAAAAAYAA..."

Deploy Contract

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• wasm_id: Binary identification of the uploaded contract to deploy.
• source_public_key: Public key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
wasm_id = <<43, 175, 217, 68, 182, 222, 246, 123, 230, 77, 134, 236, 60, 179, 45, 137, 54,
  44, 8, 19, 0, 134, 104, 112, 90, 233, 87, 199, 60, 136, 151, 169>>
source_public_key = "GDEU46HFMHBHCSFA3K336I3MJSBZCWVI3LUGSNL6AF2BW2Q2XR7NNAPM"
addl_resources = [cpu_instructions: 100]

Contract.retrieve_unsigned_xdr_to_deploy(
  server,
  network_passphrase,
  wasm_id,
  source_public_key,
  addl_resources
)

"AAAAAgAAAAD...ZAAAAFAAAAAAAAAAAAAAAAA=="

Deploy Asset Contract

Parameters

• server: Soroban.RPC.Server struct - The Soroban-RPC server to interact with.
• network_passphrase: String - The network passphrase.
• asset_code: String from 1 to 12 characters indicating the asset symbol.
• source_public_key: Public key of the function invoker responsible for signing the transaction.
• addl_resources: (optional) Keyword list to specify additional resources to include in the transaction simulation.
  • cpu_instructions: Number of additional CPU instructions to reserve.

alias Soroban.Contract

server = Soroban.RPC.Server.testnet()
network_passphrase = Stellar.Network.testnet_passphrase()
asset_code = "DBZ"
source_public_key = "GDEU46HFMHBHCSFA3K336I3MJSBZCWVI3LUGSNL6AF2BW2Q2XR7NNAPM"
addl_resources = [cpu_instructions: 100]

Contract.retrieve_unsigned_xdr_to_deploy_asset(
  server,
  network_passphrase,
  asset_code,
  source_public_key,
  addl_resources
)

"AAAAAgAAAADJ...d4kfn7AAAAFAAAAAAAAAAAAAAAAA=="

Configuration

The default HTTP Client is :hackney. Options can be passed to :hackney via configuration parameters.

config :soroban, hackney_options: [{:connect_timeout, 1000}, {:recv_timeout, 5000}]

You can also change the default HTTP Client library.

config :soroban, http_client: YourApp.CustomHTTPClient

Custom HTTP Client

soroban.ex allows you to use the HTTP client implementation of your choice. See Soroban.RPC.Client.Spec for details.

config :soroban, :http_client_impl, YourApp.CustomClientImpl

Custom JSON library

Following the same approach as the HTTP client, the JSON parsing library can also be configured. Defaults to Jason.

config :soroban, :json_library, YourApp.CustomJSONLibrary

Development

• Install an Elixir version v1.14 or lower.
• Compile dependencies: mix deps.get.
• Run tests: mix test.

Changelog

Features and bug fixes are listed in the CHANGELOG file.

Code of conduct

We welcome everyone to contribute. Make sure you have read the CODE_OF_CONDUCT before.

Contributing

For information on how to contribute, please refer to our CONTRIBUTING guide.

License

This library is licensed under an MIT license. See LICENSE for details.

Acknowledgements

Made with 💙 by kommitters Open Source