Easy Schedule

A flexible and powerful task scheduler built on Tokio, providing multiple scheduling options with advanced skip conditions and timezone support.

✨ Features

🕐 Multiple Scheduling Types

• Wait - Execute once after a delay
• Interval - Execute repeatedly at fixed intervals
• At - Execute daily at specific times
• Once - Execute at an exact datetime

🚫 Flexible Skip Conditions

• Date-based: Skip specific dates or date ranges
• Weekday-based: Skip specific weekdays or weekday ranges
• Time-based: Skip specific times or time ranges (including overnight ranges)
• Combinable: Use multiple skip rules together

🌍 Advanced Features

• Timezone Support - Full timezone support with minute-level precision
• String Parsing - Create tasks from intuitive strings like wait(5), at(14:30)
• Cancellation - Comprehensive task cancellation support
• Error Handling - Robust error handling with sensible defaults
• Async/Await - Full async support with Tokio integration

🚀 Quick Start

Add to your Cargo.toml:

[dependencies]
easy-schedule = "0.10"
tokio = { version = "1", features = ["full"] }
time = { version = "0.3", features = ["macros"] }

📖 Usage Examples

Basic Task Types

use easy_schedule::prelude::*;
use time::{Time, OffsetDateTime, macros::offset};

#[derive(Debug)]
struct MyTask {
    name: String,
}

#[async_trait]
impl Notifiable for MyTask {
    fn get_schedule(&self) -> Task {
        match self.name.as_str() {
            "wait" => Task::Wait(5, None),                    // Wait 5 seconds
            "interval" => Task::Interval(10, None),           // Every 10 seconds
            "daily" => Task::At(Time::from_hms(9, 0, 0).unwrap(), None), // Daily at 9:00 AM
            "once" => {
                let future = OffsetDateTime::now_utc() + time::Duration::minutes(5);
                Task::Once(future, None)                      // Once, 5 minutes from now
            }
            _ => Task::Wait(1, None),
        }
    }

    async fn on_time(&self, cancel: CancellationToken) {
        println!("{} executed!", self.name);
        cancel.cancel(); // Stop after first execution
    }
}

#[tokio::main]
async fn main() {
    let scheduler = Scheduler::new();
    
    scheduler.run(MyTask { name: "wait".to_string() }).await;
    scheduler.run(MyTask { name: "interval".to_string() }).await;
    
    tokio::time::sleep(std::time::Duration::from_secs(30)).await;
    scheduler.stop();
}

Skip Conditions

use easy_schedule::prelude::*;
use time::{Time, macros::time};

#[derive(Debug)]
struct BusinessHoursTask;

#[async_trait]
impl Notifiable for BusinessHoursTask {
    fn get_schedule(&self) -> Task {
        let skip_rules = vec![
            Skip::Day(vec![6, 7]),                           // Skip weekends
            Skip::TimeRange(                                 // Skip night hours
                time!(22:00), 
                time!(06:00)
            ),
            Skip::Time(time!(12:00)),                        // Skip lunch time
        ];
        
        Task::Interval(3600, Some(skip_rules))              // Every hour, with skips
    }

    async fn on_time(&self, _cancel: CancellationToken) {
        println!("Business hours task executed!");
    }

    async fn on_skip(&self, _cancel: CancellationToken) {
        println!("Skipped execution (outside business hours)");
    }
}

String Parsing

use easy_schedule::prelude::*;

// ✅ Safe parsing with error handling
match Task::parse("wait(30)") {
    Ok(task) => println!("Task created: {}", task),
    Err(err) => println!("Parse error: {}", err),
}

// ⚠️ Direct parsing (panics on error)
let task = Task::from("wait(30)");                          // Wait 30 seconds

// Multiple tasks with error handling
let task_strings = vec!["wait(30)", "interval(60)", "at(14:30)"];
let tasks: Result<Vec<Task>, String> = task_strings
    .iter()
    .map(|s| Task::parse(s))
    .collect();

match tasks {
    Ok(tasks) => println!("All tasks parsed successfully: {} tasks", tasks.len()),
    Err(err) => println!("Parse failed: {}", err),
}

Timezone Support

use easy_schedule::prelude::*;

// Different timezone configurations
let utc_scheduler = Scheduler::with_timezone(0, 0);         // UTC
let tokyo_scheduler = Scheduler::with_timezone(9, 0);       // JST
let india_scheduler = Scheduler::with_timezone(5, 30);      // IST
let ny_scheduler = Scheduler::with_timezone(-5, 0);         // EST

// Or use minute offsets directly
let custom_scheduler = Scheduler::with_timezone_minutes(330); // UTC+5:30

📋 Task Types Reference

🚫 Skip Rules Reference

🛠️ Advanced Usage

Custom Cancellation Logic

#[async_trait]
impl Notifiable for SmartTask {
    async fn on_time(&self, cancel: CancellationToken) {
        // Custom logic to decide when to stop
        if self.should_stop() {
            cancel.cancel();
        }
    }
}

Multiple Skip Conditions

let complex_skips = vec![
    Skip::Day(vec![6, 7]),                    // No weekends
    Skip::TimeRange(time!(01:00), time!(06:00)), // No early morning
    Skip::Date(date!(2024-12-25)),            // No Christmas
];

Task::Interval(1800, Some(complex_skips))     // Every 30 minutes with conditions

🏗️ Architecture

The library follows a clean separation of concerns:

• Task - Defines when to execute (Wait, Interval, At, Once)
• Skip - Defines when NOT to execute (dates, times, weekdays)
• Notifiable - Your business logic (what to execute)
• Scheduler - Orchestrates everything with timezone support

🧪 Testing

Run the comprehensive test suite:

cargo test                    # Run all tests
cargo test --test skip_tests  # Test skip functionality
cargo test --test task_tests  # Test task parsing
cargo run --example basic     # Run basic example

📚 Examples

Check out the examples/ directory for complete working examples:

• basic.rs - Basic scheduling with all task types
• skip_example.rs - Advanced skip conditions
• string_parsing.rs - String-based task creation
• error_handling.rs - Robust error handling patterns

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.