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//! Helper functions for dealing with "system.multicall" method calls.
use std::collections::HashMap;
use crate::error::Error;
use crate::fault::Fault;
use crate::serde::{XmlArray, XmlStruct, XmlStructMember, XmlValue};
use crate::traits::{TryFromValue, TryToParams, TryToValue};
use crate::types::Value;
/// Convenience method for constructing arguments for "system.multicall" calls.
pub fn into_multicall_params<P>(calls: Vec<(String, P)>) -> Result<Value, Error>
where
P: TryToParams,
{
let params: Vec<Value> = calls
.into_iter()
.map(|(n, p)| {
let members = vec![
XmlStructMember::new(Into::into("methodName"), XmlValue::string(n.into())),
XmlStructMember::new(Into::into("params"), p.try_to_params()?.try_to_value()?.into()),
];
Ok(Value::from(XmlValue::structure(XmlStruct::new(members))))
})
.collect::<Result<Vec<Value>, Error>>()?;
params.try_to_value()
}
/// Convenience method for reconstructing method calls from "system.multicall" arguments.
#[allow(clippy::type_complexity)]
pub fn from_multicall_params(mut values: Vec<Value>) -> Result<Vec<Result<(String, Vec<Value>), Error>>, Error> {
// system.multicall calls take an array of arguments as single argument
let Some(value) = values.pop() else {
return Err(Error::parameter_mismatch(0, 1));
};
// check if there are more than one arguments
if !values.is_empty() {
return Err(Error::parameter_mismatch(values.len() + 1, 1));
}
// extract vector of argument values
let params = <Vec<Value>>::try_from_value(&value)?;
let calls: Vec<Result<(String, Vec<Value>), Error>> = params
.into_iter()
.map(|v| {
let mut members: HashMap<String, Value> = HashMap::try_from_value(&v)?;
if members.len() != 2 {
return Err(Error::parameter_mismatch(members.len(), 2));
}
let Some(name) = members.remove("methodName") else {
return Err(Error::missing_field("system.multicall", "methodName"));
};
let Some(params) = members.remove("params") else {
return Err(Error::missing_field("system.multicall", "params"));
};
Ok((String::try_from_value(&name)?, <Vec<Value>>::try_from_value(¶ms)?))
})
.collect();
Ok(calls)
}
/// Convenience method for constructing return values for "system.multicall" calls.
#[must_use]
pub fn into_multicall_response(results: Vec<Result<Value, Fault>>) -> Value {
let values: Vec<Value> = results
.into_iter()
.map(|r| match r {
Ok(value) => Value::from(XmlValue::array(XmlArray::new(vec![value.into()]))),
Err(fault) => {
let members = vec![
XmlStructMember::new(Into::into("faultCode"), XmlValue::i4(fault.code())),
XmlStructMember::new(Into::into("faultString"), XmlValue::string(fault.string().into())),
];
Value::from(XmlValue::structure(XmlStruct::new(members)))
},
})
.collect();
Value::Array(values)
}
#[cfg(test)]
mod tests {
#![allow(clippy::unwrap_used)]
use super::*;
use crate::types::MethodCall;
#[test]
fn from_multicall() {
let string = "\
<methodCall>
<methodName>system.multicall</methodName>
<params>
<param>
<value>
<array>
<data>
<value>
<struct>
<member>
<name>methodName</name>
<value>event</value>
</member>
<member>
<name>params</name>
<value>
<array>
<data>
<value>foo</value>
<value>bar</value>
<value>baz</value>
<value><boolean>1</boolean></value>
</data>
</array>
</value>
</member>
</struct>
</value>
<value>
<struct>
<member>
<name>methodName</name>
<value>event</value>
</member>
<member>
<name>params</name>
<value>
<array>
<data>
<value>another</value>
<value>call</value>
<value>hi</value>
<value><boolean>1</boolean></value>
</data>
</array>
</value>
</member>
</struct>
</value>
</data>
</array>
</value>
</param>
</params>
</methodCall>";
let call: MethodCall = MethodCall::from_xml(string).unwrap();
let params = from_multicall_params(call.params).unwrap();
let expected: Vec<Result<(String, Vec<Value>), Error>> = vec![
Ok((
String::from("event"),
vec![
Value::String(String::from("foo")),
Value::String(String::from("bar")),
Value::String(String::from("baz")),
Value::Boolean(true),
],
)),
Ok((
String::from("event"),
vec![
Value::String(String::from("another")),
Value::String(String::from("call")),
Value::String(String::from("hi")),
Value::Boolean(true),
],
)),
];
assert_eq!(params, expected);
}
}