refactor: Overhaul Rhai scripting with multi-file hot reloading

This commit represents a major refactoring of our Rhai scripting system,
transforming it from a factory-based approach to a more robust system-based
architecture with improved hot reloading capabilities.

Key Changes:
- Renamed package from rhai_factory to rhai_system to better reflect its purpose
- Renamed system_factory.rs to factory.rs for consistency and clarity
- Implemented support for multiple script files in hot reloading
- Added cross-script function calls, allowing functions in one script to call functions in another
- Improved file watching to monitor all script files for changes
- Enhanced error handling for script compilation failures
- Simplified the API with a cleaner create_hot_reloadable_system function
- Removed unused modules (error.rs, factory.rs, hot_reload_old.rs, module_cache.rs, relative_resolver.rs)
- Updated all tests to work with the new architecture

The new architecture:
- Uses a System struct that holds references to script paths and provides a clean API
- Compiles and merges multiple Rhai script files into a single AST
- Automatically detects changes to any script file and recompiles them
- Maintains thread safety with proper synchronization primitives
- Provides better error messages when scripts fail to compile

This refactoring aligns with our BasePathModuleResolver approach for module imports,
making the resolution process more predictable and consistent. The hot reload example
has been updated to demonstrate the new capabilities, showing how to:
1. Load and execute multiple script files
2. Watch for changes to these files
3. Automatically reload scripts when they change
4. Call functions across different script files

All tests are passing, and the example demonstrates the improved functionality.
This commit is contained in:
Timur Gordon
2025-05-02 21:04:33 +02:00
parent 939b6b4e57
commit 372b7a2772
54 changed files with 5692 additions and 0 deletions

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[package]
name = "base_path_imports"
version = "0.1.0"
edition = "2021"
[dependencies]
rhai_factory = { path = "../.." }
rhai = "1.14.0"
chrono = "0.4.24"

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# Base Path Module Resolver Example
This example demonstrates the use of the `BasePathModuleResolver` for simplifying Rhai script module imports.
## Overview
The `BasePathModuleResolver` provides a more predictable and consistent approach to module resolution by:
1. Using a single base path for resolving all module imports
2. Eliminating the complexity of resolving imports relative to the importing file
3. Requiring all import paths to be specified relative to the base path
## Directory Structure
The example follows a hierarchical directory structure:
```
base_path_imports/
├── components/
│ ├── calendar/
│ │ └── controller/
│ │ └── mock/
│ │ └── calendar_model.rhai
│ ├── common/
│ │ └── utils/
│ │ ├── date_utils.rhai
│ │ └── string_utils.rhai
│ └── website/
│ └── controller/
│ └── mock/
│ └── website_model.rhai
├── main.rhai
└── src/
└── main.rs
```
## Key Components
### 1. BasePathModuleResolver
Located in `rhai_factory/src/relative_resolver.rs`, this resolver simplifies module imports by:
- Taking a base path during initialization
- Resolving all module imports relative to this base path
- Providing clear logging of the resolution process
### 2. Utility Modules
Common utility functions are organized in the `components/common/utils/` directory:
- `string_utils.rhai`: Basic string manipulation functions
- `date_utils.rhai`: Date formatting and validation functions
### 3. Component-Specific Modules
Component-specific functionality is organized in dedicated directories:
- `components/calendar/controller/mock/calendar_model.rhai`: Calendar event creation and validation
- `components/website/controller/mock/website_model.rhai`: Website page creation and validation
### 4. Main Script
The `main.rhai` script demonstrates importing and using modules from different components.
## Running the Example
To run the example:
```bash
cd rhai_factory/examples/base_path_imports
cargo run
```
## Key Benefits
1. **Simplified Imports**: All imports are relative to a single base path
2. **Predictable Resolution**: No need to calculate relative paths between files
3. **Cleaner Code**: No need for complex "../../../" style paths
4. **Better Organization**: Encourages a modular, component-based structure
5. **Improved Debugging**: Clear logging of the module resolution process
## Implementation Details
The example demonstrates:
1. Setting up the `BasePathModuleResolver` with a base path
2. Importing modules using paths relative to the base path
3. Using utility functions from common modules
4. Creating component-specific functionality that leverages common utilities

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// Calendar model functions
// Import common utility functions
import "components/common/utils/date_utils" as date_utils;
import "components/common/utils/string_utils" as string_utils;
// Creates a new calendar event
fn create_event(title, description, year, month, day) {
let formatted_title = string_utils::to_upper(title);
let formatted_date = date_utils::format_date(year, month, day);
return #{
title: formatted_title,
description: description,
date: formatted_date,
is_valid: is_valid_event_date(year, month, day)
};
}
// Checks if an event date is valid
fn is_valid_event_date(year, month, day) {
// Convert all parameters to integers to ensure consistent comparison
let y = year.to_int();
let m = month.to_int();
let d = day.to_int();
if m < 1 || m > 12 {
return false;
}
let max_days = date_utils::days_in_month(y, m);
return d >= 1 && d <= max_days;
}

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// Simple date utility functions
// Format a date as YYYY-MM-DD
fn format_date(year, month, day) {
let month_str = month;
let day_str = day;
return year + "-" + month_str + "-" + day_str;
}
// Check if a year is a leap year
fn is_leap_year(year) {
return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}
// Get the number of days in a month
fn days_in_month(year, month) {
if month == 2 {
if is_leap_year(year) {
return 29;
} else {
return 28;
}
}
if month == 4 || month == 6 || month == 9 || month == 11 {
return 30;
}
return 31;
}

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// Simple string utility functions
// Make a string uppercase
fn to_upper(s) {
return s.to_upper();
}
// Make a string lowercase
fn to_lower(s) {
return s.to_lower();
}
// Get string length
fn length(s) {
return s.len();
}

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// Website model functions
// Import common utility functions
import "components/common/utils/string_utils" as string_utils;
// Creates a new website page
fn create_page(title, content, slug) {
let formatted_title = string_utils::to_upper(title);
let slug_length = string_utils::length(slug);
return #{
title: formatted_title,
content: content,
slug: slug,
slug_length: slug_length,
is_valid: is_valid_slug(slug)
};
}
// Validates a page slug
fn is_valid_slug(slug) {
// Simple validation - check if it's not empty and has reasonable length
if slug.len() == 0 || slug.len() > 100 {
return false;
}
return true;
}

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// Main script that demonstrates importing modules from different components
// Import the calendar and website models
import "components/calendar/controller/mock/calendar_model" as calendar;
import "components/website/controller/mock/website_model" as website;
// Create a calendar event
fn create_calendar_event(title, description, year, month, day) {
if !calendar::is_valid_event_date(year, month, day) {
return #{ error: "Invalid date" };
}
return calendar::create_event(title, description, year, month, day);
}
// Create a website page
fn create_website_page(title, content, slug) {
if !website::is_valid_slug(slug) {
return #{ error: "Invalid slug" };
}
return website::create_page(title, content, slug);
}
// Example function that combines calendar and website functionality
fn demo() {
// Create a calendar event
let event = create_calendar_event("Team Meeting", "Weekly sync", 2025, 4, 15);
print("Calendar event: " + event);
// Create a website page
let page = create_website_page("About Us", "Company information", "about-us");
print("Website page: " + page);
return "Demo completed successfully";
}

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use rhai_factory::{RhaiFactory, BasePathModuleResolver};
use std::path::Path;
fn main() -> Result<(), Box<dyn std::error::Error>> {
// Get the base path for our scripts
let base_path = Path::new(env!("CARGO_MANIFEST_DIR"));
println!("Base path: {}", base_path.display());
println!("This example demonstrates the BasePathModuleResolver which resolves all imports relative to a base path");
// Create a new RhaiFactory
let factory = RhaiFactory::new();
// Create an engine with the base path for module resolution
let mut engine = factory.create_engine();
// Set up the BasePathModuleResolver - this is the key component that simplifies module imports
// All module imports will be resolved relative to this base path
let resolver = BasePathModuleResolver::new_with_path(&base_path);
engine.set_module_resolver(resolver);
// Register basic functions needed by our scripts
engine.register_fn("now", || chrono::Utc::now().to_rfc3339());
// Path to our main script
let main_script_path = base_path.join("main.rhai");
println!("\nEvaluating script: {}", main_script_path.display());
// Compile the main script to an AST
let ast = engine.compile_file(main_script_path)?;
// Create a scope for evaluation
let mut scope = rhai::Scope::new();
// Example 1: Call the demo function which demonstrates both calendar and website functionality
println!("\nExample 1: Running demo function");
let result: String = engine.call_fn(
&mut scope,
&ast,
"demo",
()
)?;
println!("Demo result: {}", result);
// Example 2: Call the calendar event creation function
println!("\nExample 2: Creating a calendar event");
let result: rhai::Map = engine.call_fn(
&mut scope,
&ast,
"create_calendar_event",
("Conference", "Annual tech conference", 2025, 6, 15)
)?;
println!("Calendar event: {:#?}", result);
// Example 3: Call the website page creation function
println!("\nExample 3: Creating a website page");
let result: rhai::Map = engine.call_fn(
&mut scope,
&ast,
"create_website_page",
("Contact", "Our contact information", "contact-us")
)?;
println!("Website page: {:#?}", result);
println!("\nThe BasePathModuleResolver successfully resolved all module imports relative to the base path.");
println!("This approach simplifies module imports and makes the resolution process more predictable.");
Ok(())
}