alef_e2e/codegen/
mod.rs

1//! E2e test code generation trait and language dispatch.
2//!
3//! ## DRY layer ([`client`])
4//!
5//! Per-language e2e codegen historically duplicated the structural shape of every
6//! test (function header, request build, response assert) and only differed in
7//! syntax. The [`client`] submodule pulls that shape into trait + driver pairs
8//! ([`client::TestClientRenderer`] + [`client::http_call::render_http_test`])
9//! so each language can be migrated to TestClient-driven tests by:
10//!
11//! 1. Implementing `TestClientRenderer` once per language (small, mechanical).
12//! 2. Replacing the language's monolithic `render_http_test_function` with a
13//!    call to `client::http_call::render_http_test(out, &MyRenderer, fixture)`.
14//! 3. Optionally splitting the per-language file into a directory
15//!    `<lang>/{mod.rs,client.rs,ws.rs,helpers.rs}` when the file gets unwieldy.
16//!
17//! Until a language migrates, it continues using the legacy monolithic renderer —
18//! both can coexist behind the per-language [`E2eCodegen::generate`] entry.
19
20pub mod brew;
21pub mod c;
22pub mod client;
23pub mod csharp;
24pub mod dart;
25pub mod elixir;
26pub mod gleam;
27pub mod go;
28pub mod java;
29pub mod kotlin;
30pub mod php;
31pub mod python;
32pub mod r;
33pub mod ruby;
34pub mod rust;
35pub mod swift;
36pub mod typescript;
37pub mod wasm;
38pub mod zig;
39
40use crate::config::E2eConfig;
41use crate::fixture::{Fixture, FixtureGroup};
42use alef_core::backend::GeneratedFile;
43use alef_core::config::ResolvedCrateConfig;
44use anyhow::Result;
45
46/// Check if a fixture should be included for the given language.
47///
48/// Returns false if:
49/// - The fixture has a skip condition that applies to this language
50/// - The fixture's call has no resolvable function for this language (no base
51///   `function` set and no override for the language). Calls that share a base
52///   function but only carry per-language type/arg overrides are still emitted
53///   for languages without an explicit override.
54pub(crate) fn should_include_fixture(fixture: &Fixture, language: &str, e2e_config: &E2eConfig) -> bool {
55    if let Some(skip) = &fixture.skip {
56        if skip.should_skip(language) {
57            return false;
58        }
59    }
60    let call_config = e2e_config.resolve_call(fixture.call.as_deref());
61    if call_config.function.is_empty() && !call_config.overrides.contains_key(language) {
62        return false;
63    }
64    true
65}
66
67/// Convert a JSON value's object keys from camelCase to snake_case recursively.
68///
69/// Used when serializing fixture options for FFI-based languages (Rust, C, Java)
70/// where the receiving Rust type uses default serde (snake_case) without `rename_all`.
71pub(crate) fn normalize_json_keys_to_snake_case(value: &serde_json::Value) -> serde_json::Value {
72    use heck::ToSnakeCase;
73    match value {
74        serde_json::Value::Object(obj) => {
75            let new_obj: serde_json::Map<String, serde_json::Value> = obj
76                .iter()
77                .map(|(k, v)| (k.to_snake_case(), normalize_json_keys_to_snake_case(v)))
78                .collect();
79            serde_json::Value::Object(new_obj)
80        }
81        serde_json::Value::Array(arr) => {
82            serde_json::Value::Array(arr.iter().map(normalize_json_keys_to_snake_case).collect())
83        }
84        other => other.clone(),
85    }
86}
87
88/// Trait for per-language e2e test code generation.
89pub trait E2eCodegen: Send + Sync {
90    /// Generate all e2e test project files for this language.
91    fn generate(
92        &self,
93        groups: &[FixtureGroup],
94        e2e_config: &E2eConfig,
95        config: &ResolvedCrateConfig,
96    ) -> Result<Vec<GeneratedFile>>;
97
98    /// Language name for display and directory naming.
99    fn language_name(&self) -> &'static str;
100}
101
102/// Get all available e2e code generators.
103pub fn all_generators() -> Vec<Box<dyn E2eCodegen>> {
104    vec![
105        Box::new(rust::RustE2eCodegen),
106        Box::new(python::PythonE2eCodegen),
107        Box::new(typescript::TypeScriptCodegen),
108        Box::new(go::GoCodegen),
109        Box::new(java::JavaCodegen),
110        Box::new(kotlin::KotlinE2eCodegen),
111        Box::new(csharp::CSharpCodegen),
112        Box::new(php::PhpCodegen),
113        Box::new(ruby::RubyCodegen),
114        Box::new(elixir::ElixirCodegen),
115        Box::new(gleam::GleamE2eCodegen),
116        Box::new(r::RCodegen),
117        Box::new(wasm::WasmCodegen),
118        Box::new(c::CCodegen),
119        Box::new(zig::ZigE2eCodegen),
120        Box::new(dart::DartE2eCodegen),
121        Box::new(swift::SwiftE2eCodegen),
122        Box::new(brew::BrewCodegen),
123    ]
124}
125
126/// Get e2e code generators for specific language names.
127pub fn generators_for(languages: &[String]) -> Vec<Box<dyn E2eCodegen>> {
128    all_generators()
129        .into_iter()
130        .filter(|g| languages.iter().any(|l| l == g.language_name()))
131        .collect()
132}
133
134/// Resolve a JSON field from a fixture input by path.
135///
136/// Field paths in call config are "input.path", "input.config", etc.
137/// Since we already receive `fixture.input`, strip the leading "input." prefix.
138/// When `field_path` is exactly `"input"`, the whole input object is returned.
139pub(crate) fn resolve_field<'a>(input: &'a serde_json::Value, field_path: &str) -> &'a serde_json::Value {
140    // "input" with no subpath means "the entire input object".
141    if field_path == "input" {
142        return input;
143    }
144    let path = field_path.strip_prefix("input.").unwrap_or(field_path);
145    let mut current = input;
146    for part in path.split('.') {
147        current = current.get(part).unwrap_or(&serde_json::Value::Null);
148    }
149    current
150}
alef_e2e/codegen/mod.rs

alef_e2e/codegen/
mod.rs
