openapi_nexus/generators/go/http/
codegen.rs

1//! Go HTTP code generator: IR + sigil-stitch.
2//!
3//! Receives a lowered `IrSpec` and emits:
4//! 1. Models via `sigil_emit::generate_model_files`.
5//! 2. APIs via `sigil_emit_api::generate_api_files`.
6//! 3. Hardcoded runtime (`client.go`, `auth.go`, `errors.go`).
7//! 4. `go.mod` and `README.md`.
8
9use std::error::Error;
10
11use heck::ToKebabCase as _;
12
13use super::config::GoHttpConfig;
14use super::runtime::runtime_files;
15use super::{sigil_emit, sigil_emit_api};
16use crate::codegen::traits::code_generator::CodeGenerator;
17use crate::codegen::traits::file_writer::{FileInfo, FileWriter};
18use crate::codegen::{GeneratorType, Language};
19use crate::ir::types::{IrInfo, IrSpec};
20
21const DEFAULT_MODULE_PATH: &str = "example.com/sdk";
22
23/// Go HTTP code generator.
24#[derive(Debug, Clone)]
25pub struct GoHttpCodeGenerator {
26    config: GoHttpConfig,
27}
28
29impl GoHttpCodeGenerator {
30    /// Create a new Go HTTP generator from a TOML config fragment.
31    pub fn new(config: toml::value::Table) -> Self {
32        Self {
33            config: GoHttpConfig::from(config),
34        }
35    }
36
37    fn module_path(&self) -> String {
38        self.config
39            .module_path
40            .clone()
41            .unwrap_or_else(|| DEFAULT_MODULE_PATH.to_string())
42    }
43
44    /// Orchestrate emission from the lowered IR.
45    fn generate_ir(&self, ir: &IrSpec) -> Result<Vec<FileInfo>, Box<dyn Error + Send + Sync>> {
46        let module_path = self.module_path();
47        let header = render_file_header(&ir.info);
48
49        let mut files = Vec::new();
50
51        // Models
52        files.extend(
53            sigil_emit::generate_model_files(ir, &header).map_err(|msg| {
54                Box::<dyn Error + Send + Sync>::from(format!("sigil_emit models: {msg}"))
55            })?,
56        );
57
58        // APIs
59        files.extend(
60            sigil_emit_api::generate_api_files(ir, &module_path, &header).map_err(|msg| {
61                Box::<dyn Error + Send + Sync>::from(format!("sigil_emit_api: {msg}"))
62            })?,
63        );
64
65        // Runtime (hardcoded)
66        files.extend(runtime_files(&header));
67
68        // Project files: go.mod, README.md
69        files.push(go_mod_file(&module_path));
70        files.push(readme_file(&ir.info));
71
72        Ok(files)
73    }
74}
75
76impl CodeGenerator for GoHttpCodeGenerator {
77    fn language(&self) -> Language {
78        Language::Go
79    }
80
81    fn generator_type(&self) -> GeneratorType {
82        GeneratorType::GoHttp
83    }
84
85    fn generate(&self, ir: &IrSpec) -> Result<Vec<FileInfo>, Box<dyn Error + Send + Sync>> {
86        self.generate_ir(ir)
87    }
88}
89
90impl FileWriter for GoHttpCodeGenerator {}
91
92fn render_file_header(info: &IrInfo) -> String {
93    let mut out = String::new();
94    out.push_str("// Code generated by openapi-nexus. DO NOT EDIT.\n");
95    out.push_str("//\n");
96    out.push_str(&format!("// {} — {}\n", info.title, info.version));
97    if let Some(desc) = &info.description {
98        for line in desc.lines() {
99            out.push_str(&format!("// {line}\n"));
100        }
101    }
102    out.push('\n');
103    out
104}
105
106fn go_mod_file(module_path: &str) -> FileInfo {
107    let content = format!("module {module_path}\n\ngo 1.21\n");
108    FileInfo::project("go.mod".to_string(), content)
109}
110
111fn readme_file(info: &IrInfo) -> FileInfo {
112    let title = &info.title;
113    let version = &info.version;
114    let description = info
115        .description
116        .clone()
117        .unwrap_or_else(|| "Generated Go SDK.".to_string());
118    let package = info.title.to_kebab_case();
119    let content = format!(
120        "# {title}\n\n{description}\n\nVersion: `{version}`\n\nGenerated by [openapi-nexus](https://github.com/adamcavendish/openapi-nexus) for `{package}`.\n"
121    );
122    FileInfo::readme("README.md".to_string(), content)
123}
openapi_nexus/generators/go/http/codegen.rs

openapi_nexus/generators/go/http/
codegen.rs
