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to_value proc macro

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This commit is contained in:
nora 2024-04-15 19:56:05 +02:00
parent 7d28815065
commit f3c37539f0
4 changed files with 57 additions and 47 deletions
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35
terraform-provider-example/src/main.rs
View file

@ -1,4 +1,4 @@
use std::collections::{BTreeMap, HashMap};
use std::collections::HashMap;
use terustform::{
framework::{
@ -6,7 +6,7 @@ use terustform::{
provider::Provider,
AttrPath, DResult, Diagnostics, StringValue, ValueModel,
},
values::{Value, ValueKind},
values::Value,
};
#[tokio::main]
@ -28,6 +28,13 @@ impl Provider for ExampleProvider {
struct ExampleDataSource {}
#[derive(terustform::DataSourceModel)]
struct ExampleDataSourceModel {
name: StringValue,
meow: StringValue,
id: StringValue,
}
impl DataSource for ExampleDataSource {
fn name(&self, provider_name: &str) -> String {
format!("{provider_name}_kitty")
@ -66,7 +73,7 @@ impl DataSource for ExampleDataSource {
}
fn read(&self, config: Value) -> DResult<Value> {
let model = ExampleDataSourceModel::from_value(config, &AttrPath::root())?;
let mut model = ExampleDataSourceModel::from_value(config, &AttrPath::root())?;
let StringValue::Known(name_str) = &model.name else {
return Err(Diagnostics::error_string(
@ -75,23 +82,9 @@ impl DataSource for ExampleDataSource {
};
let meow = format!("mrrrrr i am {name_str}");
Ok(Value::Known(ValueKind::Object(BTreeMap::from([
("name".to_owned(), model.name.to_value()),
(
"meow".to_owned(),
Value::Known(ValueKind::String(meow)),
),
(
"id".to_owned(),
Value::Known(ValueKind::String("0".to_owned())),
),
]))))
}
}
model.meow = StringValue::Known(meow);
model.id = StringValue::Known("0".to_owned());
#[derive(terustform::DataSourceModel)]
struct ExampleDataSourceModel {
name: StringValue,
meow: StringValue,
id: StringValue,
Ok(model.to_value())
}
}

57
terustform-macros/src/lib.rs
View file

@ -30,7 +30,7 @@ fn data_source_model_inner(
));
};
let terustform = quote!(::terustform::__derive_private);
let tf = quote!(::terustform::__derive_private);
let fields = fields
.named
@ -44,61 +44,74 @@ fn data_source_model_inner(
})
.collect::<Result<Vec<_>, _>>()?;
let field_extractions = fields.iter().map(|(name, ty)| {
let name_str = proc_macro2::Literal::string(&name.to_string());
quote! {
let #terustform::Some(#name) = obj.remove(#name_str) else {
return #terustform::Err(
#terustform::Diagnostics::error_string(
let #tf::Some(#name) = obj.remove(#name_str) else {
return #tf::Err(
#tf::Diagnostics::error_string(
format!("Expected property '{}', which was not present", #name_str),
).with_path(path.clone())
);
};
let #name = <#ty as #terustform::ValueModel>::from_value(
let #name = <#ty as #tf::ValueModel>::from_value(
#name,
&path.append_attribute_name(#terustform::ToOwned::to_owned(#name_str))
&path.append_attribute_name(#tf::ToOwned::to_owned(#name_str))
)?;
}
});
let constructor_fields = fields.iter().map(|(name, _)| quote! { #name, });
let to_value_fields = fields.iter().map(|(name, ty)| {
let name_str = proc_macro2::Literal::string(&name.to_string());
quote! { (#name_str, <#ty as #tf::ValueModel>::to_value(self.#name)), }
});
let (impl_generics, type_generics, where_clause) = input.generics.split_for_impl();
Ok(quote! {
#[automatically_derived]
impl #impl_generics #terustform::ValueModel
impl #impl_generics #tf::ValueModel
for #struct_name #type_generics #where_clause
{
fn from_value(v: #terustform::Value, path: &#terustform::AttrPath) -> #terustform::DResult<Self> {
fn from_value(v: #tf::Value, path: &#tf::AttrPath) -> #tf::DResult<Self> {
match v {
#terustform::BaseValue::Unknown => {
return #terustform::Err(#terustform::Diagnostics::with_path(
#terustform::Diagnostics::error_string(#terustform::ToOwned::to_owned("Expected object, found unknown value")),
#terustform::Clone::clone(&path),
#tf::BaseValue::Unknown => {
return #tf::Err(#tf::Diagnostics::with_path(
#tf::Diagnostics::error_string(#tf::ToOwned::to_owned("Expected object, found unknown value")),
#tf::Clone::clone(&path),
));
},
#terustform::BaseValue::Null => {
return #terustform::Err(#terustform::Diagnostics::with_path(
#terustform::Diagnostics::error_string(#terustform::ToOwned::to_owned("Expected object, found null value")),
#terustform::Clone::clone(&path),
#tf::BaseValue::Null => {
return #tf::Err(#tf::Diagnostics::with_path(
#tf::Diagnostics::error_string(#tf::ToOwned::to_owned("Expected object, found null value")),
#tf::Clone::clone(&path),
));
},
#terustform::BaseValue::Known(#terustform::ValueKind::Object(mut obj)) => {
#tf::BaseValue::Known(#tf::ValueKind::Object(mut obj)) => {
#(#field_extractions)*
Ok(#struct_name {
#(#constructor_fields)*
})
},
#terustform::BaseValue::Known(v) => {
return #terustform::Err(#terustform::Diagnostics::with_path(
#terustform::Diagnostics::error_string(format!("Expected object, found {} value", v.diagnostic_type_str())),
#terustform::Clone::clone(&path),
#tf::BaseValue::Known(v) => {
return #tf::Err(#tf::Diagnostics::with_path(
#tf::Diagnostics::error_string(format!("Expected object, found {} value", v.diagnostic_type_str())),
#tf::Clone::clone(&path),
));
},
}
}
fn to_value(self) -> #tf::Value {
#tf::new_object(
[
#(#to_value_fields)*
]
)
}
}
})
}

4
terustform/src/framework/mod.rs
View file

@ -90,9 +90,7 @@ impl<T> BaseValue<T> {
pub trait ValueModel: Sized {
fn from_value(v: Value, path: &AttrPath) -> DResult<Self>;
fn to_value(self) -> Value {
todo!()
}
fn to_value(self) -> Value;
}
impl ValueModel for StringValue {

8
terustform/src/lib.rs
View file

@ -108,5 +108,11 @@ pub mod __derive_private {
AttrPath, AttrPathSegment, BaseValue, DResult, Diagnostics, ValueModel,
};
pub use crate::values::{Value, ValueKind};
pub use {Clone, Result::Err, Option::Some, ToOwned};
pub use {Clone, Option::Some, Result::Err, ToOwned};
pub fn new_object<const N: usize>(elems: [(&str, Value); N]) -> Value {
Value::Known(ValueKind::Object(std::collections::BTreeMap::from_iter(
elems.into_iter().map(|(k, v)| (k.to_owned(), v)),
)))
}
}