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use proc_macro2::TokenStream;
use quote::quote;
use syn::Type;
use super::{Response, ResponseField};
impl Response {
pub fn expand_incoming(&self, error_ty: &Type, ruma_api: &TokenStream) -> TokenStream {
let http = quote! { #ruma_api::exports::http };
let ruma_serde = quote! { #ruma_api::exports::ruma_serde };
let serde_json = quote! { #ruma_api::exports::serde_json };
let extract_response_headers = self.has_header_fields().then(|| {
quote! {
let mut headers = response.headers().clone();
}
});
let typed_response_body_decl = self.has_body_fields().then(|| {
quote! {
let response_body: <
ResponseBody
as #ruma_serde::Outgoing
>::Incoming = {
let body = ::std::convert::AsRef::<[::std::primitive::u8]>::as_ref(
response.body(),
);
#serde_json::from_slice(match body {
// If the response body is completely empty, pretend it is an empty
// JSON object instead. This allows responses with only optional body
// parameters to be deserialized in that case.
[] => b"{}",
b => b,
})?
};
}
});
let response_init_fields = {
let mut fields = vec![];
let mut raw_body = None;
for response_field in &self.fields {
let field = response_field.field();
let field_name =
field.ident.as_ref().expect("expected field to have an identifier");
let cfg_attrs =
field.attrs.iter().filter(|a| a.path.is_ident("cfg")).collect::<Vec<_>>();
fields.push(match response_field {
ResponseField::Body(_) | ResponseField::NewtypeBody(_) => {
quote! {
#( #cfg_attrs )*
#field_name: response_body.#field_name
}
}
ResponseField::Header(_, header_name) => {
let optional_header = match &field.ty {
syn::Type::Path(syn::TypePath {
path: syn::Path { segments, .. },
..
}) if segments.last().unwrap().ident == "Option" => {
quote! {
#( #cfg_attrs )*
#field_name: {
headers.remove(#http::header::#header_name)
.map(|h| h.to_str().map(|s| s.to_owned()))
.transpose()?
}
}
}
_ => quote! {
#( #cfg_attrs )*
#field_name: {
headers.remove(#http::header::#header_name)
.expect("response missing expected header")
.to_str()?
.to_owned()
}
},
};
quote! { #optional_header }
}
// This field must be instantiated last to avoid `use of move value` error.
// We are guaranteed only one new body field because of a check in
// `parse_response`.
ResponseField::RawBody(_) => {
raw_body = Some(quote! {
#( #cfg_attrs )*
#field_name: {
::std::convert::AsRef::<[::std::primitive::u8]>::as_ref(
response.body(),
)
.to_vec()
}
});
// skip adding to the vec
continue;
}
});
}
fields.extend(raw_body);
quote! {
#(#fields,)*
}
};
quote! {
#[automatically_derived]
#[cfg(feature = "client")]
impl #ruma_api::IncomingResponse for Response {
type EndpointError = #error_ty;
fn try_from_http_response<T: ::std::convert::AsRef<[::std::primitive::u8]>>(
response: #http::Response<T>,
) -> ::std::result::Result<
Self,
#ruma_api::error::FromHttpResponseError<#error_ty>,
> {
if response.status().as_u16() < 400 {
#extract_response_headers
#typed_response_body_decl
::std::result::Result::Ok(Self {
#response_init_fields
})
} else {
match <#error_ty as #ruma_api::EndpointError>::try_from_http_response(
response
) {
::std::result::Result::Ok(err) => {
Err(#ruma_api::error::ServerError::Known(err).into())
}
::std::result::Result::Err(response_err) => {
Err(#ruma_api::error::ServerError::Unknown(response_err).into())
}
}
}
}
}
}
}
}