Add params models

src/soroban/models.py

@@ -1,11 +1,12 @@
 import pathlib
 from typing import Literal
 
-from pydantic import model_validator, HttpUrl
+from pydantic import BaseModel, ConfigDict, model_validator, HttpUrl
 from pydantic_settings import BaseSettings, SettingsConfigDict
-from stellar_sdk import Keypair, Network
+from stellar_sdk import xdr
+from stellar_sdk import Keypair, Network, scval
 
-__all__ = ["Identity", "NetworkConfig"]
+__all__ = ["Identity", "NetworkConfig", "Parameter", "Parameters"]
 
 
 def _load_configuration(id: str | pathlib.Path, kind: Literal["identity", "network"]):
@@ -72,3 +73,21 @@ def from_network(cls, network: str | pathlib.Path | None = None) -> "NetworkConf
             fname = _load_configuration(network, "network")
             network = NetworkConfig(_env_file=fname)
         return network
+
+
+class Parameter(BaseModel):
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+
+    name: str
+    type: str
+    value: int | float | str | xdr.SCVal
+
+    @model_validator(mode="after")
+    def value_to_scval(self) -> "Parameter":
+        if not isinstance(self.value, xdr.SCVal):
+            self.value = getattr(scval, f"to_{self.type}")(self.value)
+        return self
+
+
+class Parameters(BaseModel):
+    args: list[Parameter]

tests/params_invoke.json

@@ -0,0 +1,12 @@
+[
+  {
+    "name": "issuer",
+    "type": "address",
+    "value": "CAARHG6ZR6DPHOSH5HAHPJZKXJV6YJVDRYZ7ADGPEC2MQMDUKAQCGNWB"
+  },
+  {
+    "name": "distributor",
+    "type": "int128",
+    "value": 10
+  }
+]

tests/test_models.py

@@ -1,8 +1,9 @@
+import json
 import pathlib
 
 import pytest
 import soroban
-from stellar_sdk import Keypair
+from stellar_sdk import Keypair, scval
 
 
 class TestIdentity:
@@ -37,3 +38,19 @@ class TestNetworkConfig:
     def test_from_network(self):
         testnet = pathlib.Path(__file__).parent / "testnet.toml"
         soroban.NetworkConfig.from_network(network=testnet)
+
+
+class TestParams:
+
+    def test_parameter(self):
+        args = {"name": "distributor", "type": "int128", "value": 10}
+        soroban.Parameter(**args)
+
+        args = {"name": "distributor", "type": "int128", "value": scval.to_int128(10)}
+        soroban.Parameter(**args)
+
+    def test_parameters(self):
+        fname = pathlib.Path(__file__).parent / "params_invoke.json"
+        with open(fname, "rb") as fd:
+            args = json.load(fd)
+        soroban.Parameters(args=args)