json-rules-engine

Installation

Add this package to Cargo.toml of your project. (Check https://crates.io/crates/json-rules-engine for right version)

toml [dependencies] json-rules-engine = { version = "0.6.0", features = ["email"] } tokio = { version = "0.3.3", features = ["macros"] } serde_json = { version = "*" } anyhow = { version = "*" }

Features

• Built in operators
• Full support for ALL, ANY, AtLeast boolean operators, including recursive nesting
• Type Safe
• Load rules from json
• HTTP post to callback url
• Built in Moustache render
• Email notifications based on SendGrid
• Safe script
• Custom function

Get started

```rust use jsonrulesengine::{Engine, Rule, Map, fromdynamic}; use serdejson::json; use serde::{Serialize, Deserialize};

[derive(Deserialize, Serialize)]

struct Facts { name: String, age: u8, action: String }

fn agegreaterthan20lessthaninclusive25(p: Map) -> bool { let facts: Facts = fromdynamic(&p.into()).unwrap(); facts.age > 20 && facts.age <= 25 }

[tokio::main]

async main() -> anyhow::Result<()> { let rulejson = json!({ "conditions": { "and": [ { "field": "name", "operator": "stringequals", "value": "Cheng JIANG" }, { "field": "age", "operator": "intinrange", "value": [20, 25] }, { "script": "facts.age > 20 && facts.age <= 25", }, { "script": "myfunction(facts)", }, { "field": "action", "operator": "stringequals", "value": "coding in rust" } ] }, "event": { "type": "posttocallbackurl", "params": { "callbackurl": "http://example.com/people/condinginrust", "type": "info", "title": "Another person is coding in rust", "message": "Name: {{ name }}, Age: {{ age }}, Action: {{ action }}," } } });

let rule: Rule = serde_json::from_str::<Rule>(&serde_json::to_string(&rule_json).unwrap()).unwrap();

let mut engine = Engine::new();
engine.add_rule(rule);
engine.add_function("my_function", age_greater_than20_less_than_inclusive25);

let facts = json!({
    "name": "Cheng JIANG",
    "age": 24,
    "action": "coding in rust",
});

let rule_results = engine.run(&facts).await?;

println!("{:?}", rule_results);

} ```

Special Thanks

• bsundsrud for its basic implementation ruuls-rs