zinit 0.3.9

Process supervisor with dependency management
Documentation 
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#!/usr/bin/env zinit
//! Complete Production Example
//!
//! Full-featured example with system services, logging, and health monitoring

let z = zinit.log_level(2).connect();

print("=== Complete Production Setup ===");
print("");

// System service for logging (system class, protected from bulk ops)
print("1. Setting up logging service:");
z.service_new()
    .name("log_aggregator")
    .exec("rsyslog")
    .class("system")
    .critical(true)
    .restart("always")
    .register();

// Database service with persistent logging
print("");
print("2. Setting up database:");
z.service_new()
    .name("postgres")
    .exec("postgres -D /var/lib/postgres")
    .class("system")
    .critical(true)
    .after("log_aggregator")
    .health_tcp("127.0.0.1:5432")
    .health_interval_ms(10000)
    .health_retries(3)
    .restart("on-failure")
    .restart_delay_ms(5000)
    .start_timeout_ms(30000)
    .log_buffer_lines(5000)
    .log_file("/var/log/postgres.log")
    .register();

// Cache service
print("");
print("3. Setting up cache:");
z.service_new()
    .name("redis")
    .exec("redis-server --port 6379")
    .after("log_aggregator")
    .health_tcp("127.0.0.1:6379")
    .health_interval_ms(5000)
    .restart("on-failure")
    .register();

// Main API service
print("");
print("4. Setting up API server:");
z.service_new()
    .name("api")
    .exec("node /app/server.js")
    .dir("/app")
    .env("NODE_ENV", "production")
    .env("DB_HOST", "localhost")
    .env("REDIS_HOST", "localhost")
    .requires("postgres")
    .requires("redis")
    .after("postgres")
    .after("redis")
    .health_http("http://localhost:3000/health")
    .health_expect_status(200)
    .health_interval_ms(10000)
    .health_timeout_ms(5000)
    .health_retries(3)
    .restart("always")
    .restart_delay_ms(5000)
    .restart_delay_max_ms(60000)
    .max_restarts(0)
    .stability_period_ms(60000)
    .start_timeout_ms(30000)
    .stop_timeout_ms(10000)
    .log_buffer_lines(10000)
    .register();

// Worker service
print("");
print("5. Setting up background workers:");
z.service_new()
    .name("workers")
    .exec("node /app/workers.js")
    .dir("/app")
    .env("NODE_ENV", "production")
    .env("DB_HOST", "localhost")
    .wants("redis")
    .after("api")
    .restart("on-failure")
    .log_buffer_lines(2000)
    .register();

print("");
print("6. Starting core services:");
z.start("log_aggregator");
z.start("postgres");
z.start("redis");
z.start("api");
z.start("workers");

print("");
print("7. Viewing service status:");
let services = z.list();
for svc in services {
    let status = z.status(svc);
    print("   " + svc + ": " + status.state);
}

print("");
print("✓ Production setup complete");