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#![recursion_limit = "512"]
#![deny(missing_docs)]
#[macro_use]
extern crate failure;
extern crate graphql_parser;
extern crate heck;
extern crate itertools;
#[macro_use]
extern crate lazy_static;
extern crate proc_macro;
extern crate proc_macro2;
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;
extern crate syn;
#[macro_use]
extern crate quote;
use proc_macro2::TokenStream;
pub mod attributes;
mod codegen;
pub mod deprecation;
mod introspection_response;
mod query;
pub mod schema;
mod constants;
mod enums;
mod field_type;
mod fragments;
mod inputs;
mod interfaces;
mod objects;
mod operations;
mod scalars;
mod selection;
mod shared;
mod unions;
mod variables;
use heck::SnakeCase;
#[cfg(test)]
mod tests;
use proc_macro2::{Ident, Span};
type CacheMap<T> =
::std::sync::Mutex<::std::collections::hash_map::HashMap<::std::path::PathBuf, T>>;
lazy_static! {
static ref SCHEMA_CACHE: CacheMap<schema::Schema> = CacheMap::default();
static ref QUERY_CACHE: CacheMap<(String, graphql_parser::query::Document)> =
CacheMap::default();
}
pub struct GraphQLClientDeriveOptions {
pub struct_name: String,
pub additional_derives: Option<String>,
pub deprecation_strategy: Option<deprecation::DeprecationStrategy>,
}
#[derive(Serialize, Deserialize, Debug)]
pub(crate) struct FullResponse<T> {
data: T,
}
pub fn generate_module_token_stream(
query_path: std::path::PathBuf,
schema_path: std::path::PathBuf,
options: Option<GraphQLClientDeriveOptions>,
) -> Result<TokenStream, failure::Error> {
let options = options.unwrap();
let response_derives = options.additional_derives;
let deprecation_strategy = options
.deprecation_strategy
.unwrap_or(deprecation::DeprecationStrategy::default());
let (query_string, query) = {
let mut lock = QUERY_CACHE.lock().expect("query cache is poisoned");
match lock.entry(query_path) {
::std::collections::hash_map::Entry::Occupied(o) => o.get().clone(),
::std::collections::hash_map::Entry::Vacant(v) => {
let query_string = read_file(v.key())?;
let query = graphql_parser::parse_query(&query_string)?;
v.insert((query_string, query)).clone()
}
}
};
let operation = if let Some(op) = codegen::select_operation(&query, &options.struct_name) {
op
} else {
panic!("Query document defines no operation.")
};
let operation_name_literal = &operation.name;
let schema = {
let mut lock = SCHEMA_CACHE.lock().expect("schema cache is poisoned");
match lock.entry(schema_path) {
::std::collections::hash_map::Entry::Occupied(o) => o.get().clone(),
::std::collections::hash_map::Entry::Vacant(v) => {
let schema_string = read_file(v.key())?;
let schema = {
let extension = v
.key()
.extension()
.and_then(|e| e.to_str())
.unwrap_or("INVALID");
match extension {
"graphql" | "gql" => {
let s = graphql_parser::schema::parse_schema(&schema_string)?;
schema::Schema::from(s)
}
"json" => {
let parsed: FullResponse<introspection_response::IntrospectionResponse> = ::serde_json::from_str(&schema_string)?;
schema::Schema::from(parsed.data)
}
extension => panic!("Unsupported extension for the GraphQL schema: {} (only .json and .graphql are supported)", extension)
}
};
v.insert(schema).clone()
}
}
};
let module_name = Ident::new(
options.struct_name.to_snake_case().as_str(),
Span::call_site(),
);
let struct_name = Ident::new(options.struct_name.as_str(), Span::call_site());
let schema_output = codegen::response_for_query(
schema,
query,
&operation,
response_derives,
deprecation_strategy,
)?;
let result = quote!(
pub mod #module_name {
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
#![allow(dead_code)]
use serde;
pub const QUERY: &'static str = #query_string;
pub const OPERATION_NAME: &'static str = #operation_name_literal;
#schema_output
}
impl<'de> ::graphql_client::GraphQLQuery<'de> for #struct_name {
type Variables = #module_name::Variables;
type ResponseData = #module_name::ResponseData;
fn build_query(variables: Self::Variables) -> ::graphql_client::QueryBody<Self::Variables> {
::graphql_client::QueryBody {
variables,
query: #module_name::QUERY,
operation_name: #module_name::OPERATION_NAME,
}
}
}
);
Ok(result)
}
fn read_file(path: &::std::path::Path) -> Result<String, failure::Error> {
use std::io::prelude::*;
let mut out = String::new();
let mut file = ::std::fs::File::open(path).map_err(|io_err| {
let err: failure::Error = io_err.into();
err.context(format!(
r#"
Could not find file with path: {}
Hint: file paths in the GraphQLQuery attribute are relative to the project root (location of the Cargo.toml). Example: query_path = "src/my_query.graphql".
"#,
path.display()
))
})?;
file.read_to_string(&mut out)?;
Ok(out)
}