WxRust

A comprehensive Rust SDK for the WeChat ecosystem, ported from WxJava

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Overview · Modules · Architecture · Quick Start · Features · Quality · Compatibility · Contributing

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Version: 0.1.0
MSRV: Rust 1.85
Edition: 2024
Workspace Resolver: 3
Maturity: Experimental
Last verified: 2026-08-10

1. Overview

1.1 What is WxRust?

WxRust is a Rust workspace providing a full-stack SDK for WeChat backend development, covering Official Accounts (MP), Mini Programs, WeChat Pay, WeChat Work (CP), Open Platform, Channels/Shop, and AI Speech.

It is a semantic port of WxJava (v4.8.4.B), aiming for 100% functional behavior parity while adopting idiomatic Rust patterns.

Dimension	Value
Version	0.1.0
MSRV / Edition	1.85 / 2024
unsafe policy	#![forbid(unsafe_code)]
Async runtime	tokio
HTTP client	reqwest (rustls)
License	Apache-2.0

1.2 What WxRust is NOT

• Not a binary-compatible drop-in for WxJava; API names are preserved but signatures use Rust idioms (Result, Option, async fn).
• Not a thin FFI wrapper; it is a pure Rust reimplementation.
• Not production-ready yet; the project is in experimental/migration phase.

1.3 Status Evidence

Claim	Value	Evidence
Workspace compiles	Pass	cargo check --workspace
Tests	All green, 0 failures	cargo test --workspace
Coverage (line)	39.81%	cargo llvm-cov --workspace
Java objects mapped	3287 / 3287 (0 MISSING)	docs/migration/README.md
Rust source files	3406	find crates -name '*.rs'

2. Module Map

Java Module	Rust Crate	Objects	Scope
weixin-java-common	wx-rust-common	174	Error model, token engine, HTTP, session, dedup
weixin-java-mp	wx-rust-mp	428	Official Accounts API, message router, XML crypto
weixin-java-miniapp	wx-rust-miniapp	611	Mini Program code2Session, 50+ sub-services
weixin-java-pay	wx-rust-pay	570	WeChat Pay v2/v3, certs, signatures, XML
weixin-java-cp	wx-rust-cp	594	WeChat Work, session archive, OA
weixin-java-open	wx-rust-open	240	Third-party platform, proxy mp/ma
weixin-java-channel	wx-rust-channel	618	Channels / WeChat Shop e-commerce
weixin-java-aispeech	wx-rust-aispeech	25	AI Speech
weixin-java-qidian	wx-rust-qidian	27	Qidian call center
facade	wx-rust	—	Feature-gated re-exports

3. Architecture

┌─────────────────────────────────────────────────────────┐
│  Integration (future)  wx-rust-vernal / wx-rust-axum    │
├─────────────────────────────────────────────────────────┤
│  Business Layer  wx-rust-mp / miniapp / pay / cp /       │
│                  open / channel / aispeech / qidian      │
│                  Service traits + sub-domain services    │
├─────────────────────────────────────────────────────────┤
│  Foundation      wx-rust-common                          │
│                  error / config / http / bean / session  │
├─────────────────────────────────────────────────────────┤
│  Facade          wx-rust (feature-gated re-exports)      │
└─────────────────────────────────────────────────────────┘

3.1 Dependency Rules

• wx-rust-common has zero business-crate dependencies.
• Business crates depend only on common; no inter-business dependencies.
• Facade does re-exports only; no logic.

3.2 Key Java-to-Rust Mappings

Java Mechanism	Rust Design	Reason
Inheritance chain (ServiceImpl -> HttpComponentsImpl -> Base)	trait + composition	No inheritance in Rust
synchronized / ReentrantLock	tokio::sync::Mutex / RwLock	Async-native
Gson	serde + serde_json	Compile-time zero-cost
Apache HttpClient / OkHttp / Jodd	reqwest (single backend)	Simplify to one HTTP stack
Checked exception	thiserror + Result	Explicit error propagation
null	Option<T>	Nullability visible in types
ExecutorService (Router)	tokio::task::spawn	Async task scheduling

4. Rust Baseline

Item	Value	Source
MSRV	1.85	workspace.package.rust-version
Edition	2024	workspace.package.edition
Resolver	3	[workspace] resolver
Clippy	-D warnings	CI

5. Quick Start

5.1 Add dependency

[dependencies]
wx-rust-common = { git = "https://github.com/easy-4-rust/WxRust", branch = "main" }

5.2 Minimal example

use wx_rust_common::error::WxError;

fn main() {
    let json = r#"{"errcode":0,"errmsg":"ok"}"#;
    let err = WxError::from_json(json);
    println!("error_code={}", err.error_code);
}

5.3 Enable a business module

[dependencies]
wx-rust-mp = { git = "https://github.com/easy-4-rust/WxRust", branch = "main" }

6. Cargo Features

Feature	Default	Description	Crate
default	Yes	Core types and traits	wx-rust-common
redis	No	Redis-backed storage (dedup, locks, config)	wx-rust-common

[dependencies]
wx-rust-common = { version = "0.1.0", default-features = false, features = ["redis"] }

7. Project Structure

WxRust/
├── Cargo.toml              # Workspace
├── crates/
│   ├── wx-rust/            # Facade (feature-gated)
│   ├── wx-rust-common/     # Foundation
│   ├── wx-rust-mp/         # Official Accounts
│   ├── wx-rust-miniapp/    # Mini Programs
│   ├── wx-rust-pay/        # WeChat Pay
│   ├── wx-rust-cp/         # WeChat Work
│   ├── wx-rust-open/       # Open Platform
│   ├── wx-rust-channel/    # Channels / Shop
│   ├── wx-rust-aispeech/   # AI Speech
│   └── wx-rust-qidian/     # Qidian
├── docs/                   # Architecture, migration, tech stack
├── scripts/                # Audit and generation scripts
├── integration/            # Framework integrations (future)
└── README.md

8. Quality Gates

8.1 Core gates

cargo check --workspace
cargo test --workspace
cargo clippy --workspace --all-targets --all-features -- -D warnings

8.2 Coverage

cargo llvm-cov --workspace --summary-only

Metric	Value
Line coverage	39.81%
Function coverage	25.67%
Region coverage	38.00%

Coverage is a signal for gap detection, not a completion authority. Completion authority is the per-module object ledger + semantic table + name consistency check.

9. Compatibility with WxJava

9.1 Upstream reference

Item	Value
Upstream project	WxJava
Pinned version	4.8.4.B (commit a49d6e1)
Authority source	WxJava source, tests, fixtures
Rust target	Behavioral parity + idiomatic Rust
Non-targets	ABI compatibility, JVM/bytecode/platform-specific classes

9.2 Object migration status

Java Module	Objects	Implemented	PLATFORM_NA	DEPENDENCY_REUSED	MISSING
common	174	90	87	1	0
mp	428	284	44	39	0
miniapp	611	560	35	16	0
pay	570	556	12	2	0
cp	594	565	20	9	0
open	240	213	14	13	0
channel	618	603	9	6	0
aispeech	25	23	2	0	0
qidian	27	20	7	0	0
Total	3287	2914	230	86	0

9.3 Key semantic mappings

Java Pattern	Rust Implementation
AccessToken double-check lock	async fn + tokio::sync::Mutex + 3s timeout
Execute engine with retry	loop + exponential backoff (1s, 2s, 4s, 8s, 16s)
Token auto-refresh (single retry)	execute_internal with no_auto_refresh flag
Message router (builder pattern)	WxMpMessageRouter + Vec<Rule> + async dispatch
ConfigStorage multi-backend	trait WxConfigStorage + memory/Redis implementations

9.4 Explicit non-migration items

Java Component	Reason	Rust Alternative
Apache/OkHttp/Jodd HTTP backends	Java HTTP client adapters	reqwest unified
Gson TypeAdapter	Gson-specific	serde derive
Native-image config	GraalVM-specific	Rust native binary
Solon plugins	JVM framework	No Rust equivalent

10. Documentation

Document	Path	Purpose
Migration Roadmap	docs/MIGRATION_ROADMAP.md	B0-V6 phase plan
Object Mapping	docs/OBJECT_MAPPING_TABLE.md	3287 object index
Semantic Mapping	docs/SEMANTIC_MAPPING_TABLE.md	Core call chain / error / serialization
Name Consistency	docs/NAME_CONSISTENCY_CHECK.md	Java-to-Rust naming
Tech Stack	docs/TECH_STACK_SELECTION.md	Dependency selection
Architecture	docs/ARCHITECTURE.md	Component replacement decisions
Module Migrations	docs/migration/<module>/	Per-module 4-document sets

11. Troubleshooting

Symptom	Common Cause	Fix
cargo check fails	MSRV too low	Use Rust >= 1.85
Feature compile error	Missing optional dep	Enable required feature
Test timeout	Async runtime conflict	Ensure tokio features match

12. Contributing & License

Contributions welcome. Before submitting, run:

cargo fmt --all -- --check
cargo clippy --workspace --all-targets --all-features -- -D warnings
cargo test --workspace

This project is licensed under Apache-2.0.

Upstream: WxJava (Apache-2.0).

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