init
This commit is contained in:
3
.gitignore
vendored
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3
.gitignore
vendored
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@ -0,0 +1,3 @@
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/target
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/vendor
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session.vim
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47
Cargo.lock
generated
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47
Cargo.lock
generated
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 4
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[[package]]
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name = "derive_http"
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version = "0.1.0"
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dependencies = [
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "proc-macro2"
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version = "1.0.95"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "02b3e5e68a3a1a02aad3ec490a98007cbc13c37cbe84a3cd7b8e406d76e7f778"
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dependencies = [
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"unicode-ident",
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]
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[[package]]
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name = "quote"
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version = "1.0.40"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1885c039570dc00dcb4ff087a89e185fd56bae234ddc7f056a945bf36467248d"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "syn"
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version = "2.0.104"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "17b6f705963418cdb9927482fa304bc562ece2fdd4f616084c50b7023b435a40"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-ident",
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]
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[[package]]
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name = "unicode-ident"
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version = "1.0.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
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12
Cargo.toml
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12
Cargo.toml
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[package]
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name = "derive_http"
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version = "0.1.0"
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edition = "2024"
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[lib]
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proc-macro = true
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[dependencies]
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proc-macro2 = "1.0.95"
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quote = "1.0.40"
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syn = "2.0.104"
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113
src/lib.rs
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113
src/lib.rs
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use proc_macro::TokenStream;
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use quote::quote;
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use syn::{parse_macro_input, Data, DeriveInput, Fields};
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/// Derives a `.send()` method for API query structs and enums using `awc::Client`.
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///
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/// - Structs: sends GET requests using fields prefixed with `lnk_p_` as query parameters.
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/// - Enums: delegates `.send()` to inner struct that implements `Queryable`.
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#[proc_macro_derive(HttpGetRequest)]
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pub fn derive_http_get_request(input: TokenStream) -> TokenStream {
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let input = parse_macro_input!(input as DeriveInput);
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let name = input.ident;
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let expanded = match &input.data {
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// ---- Struct: Build .send() that builds and sends the GET request
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Data::Struct(data_struct) => {
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let fields = match &data_struct.fields {
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Fields::Named(named) => &named.named,
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_ => panic!("#[derive(HttpGetRequest)] supports only named fields for structs"),
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};
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// Gather query parameters from fields prefixed with lnk_p_
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let mut query_param_code = Vec::new();
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for field in fields {
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let ident = field.ident.clone().unwrap();
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let field_name = ident.to_string();
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if field_name.starts_with("lnk_p_") {
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let key = &field_name["lnk_p_".len()..];
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query_param_code.push(quote! {
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query_params.push((#key.to_string(), self.#ident.to_string()));
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});
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}
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}
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quote! {
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impl #name {
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/// Sends a GET request using `awc::Client`.
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pub async fn send(
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&self,
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base_url: &str,
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headers: Option<Vec<(&str, &str)>>
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) -> Result<awc::ClientResponse, awc::error::SendRequestError> {
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use awc::Client;
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use urlencoding::encode;
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// Collect query parameters
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let mut query_params: Vec<(String, String)> = Vec::new();
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#(#query_param_code)*
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// Build URL with query string
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let mut url = base_url.to_string();
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if !query_params.is_empty() {
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let mut query_parts = Vec::new();
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for (k, v) in &query_params {
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query_parts.push(format!("{}={}", k, encode(v)));
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}
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url.push('?');
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url.push_str(&query_parts.join("&"));
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}
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// Prepare client and request
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let client = Client::default();
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let mut request = client.get(url);
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// Optional headers
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if let Some(hdrs) = headers {
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for (k, v) in hdrs {
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request = request.append_header((k, v));
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}
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}
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// Send the request
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let response = request.send().await?;
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Ok(response)
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}
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}
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}
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}
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// ---- Enum: Match each variant and call .send() on the inner type
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Data::Enum(data_enum) => {
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let mut variant_arms = Vec::new();
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for variant in &data_enum.variants {
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let vname = &variant.ident;
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match &variant.fields {
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Fields::Unnamed(fields) if fields.unnamed.len() == 1 => {
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variant_arms.push(quote! {
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#name::#vname(inner) => inner.send().await,
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});
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}
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_ => panic!(
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"#[derive(HttpGetRequest)] enum variants must have a single unnamed field"
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),
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}
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}
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quote! {
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impl #name {
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/// Calls `.send()` on the wrapped query variant.
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pub async fn send(&self) -> Result<awc::ClientResponse, awc::error::SendRequestError> {
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match self {
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#(#variant_arms)*
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}
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}
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}
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}
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}
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_ => panic!("#[derive(HttpGetRequest)] only supports structs and enums"),
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};
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TokenStream::from(expanded)
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}
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