langchain-rust 5.1.0

LangChain for Rust, the easiest way to write LLM-based programs in Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

use std::sync::Arc;

use tokio::sync::Mutex;

use crate::schemas::{memory::BaseMemory, messages::Message};

pub struct DummyMemory {}

impl DummyMemory {
    pub fn new() -> Self {
        Self {}
    }
}

impl Into<Arc<dyn BaseMemory>> for DummyMemory {
    fn into(self) -> Arc<dyn BaseMemory> {
        Arc::new(self)
    }
}

impl Into<Arc<Mutex<dyn BaseMemory>>> for DummyMemory {
    fn into(self) -> Arc<Mutex<dyn BaseMemory>> {
        Arc::new(Mutex::new(self))
    }
}

impl BaseMemory for DummyMemory {
    fn messages(&self) -> Vec<Message> {
        vec![]
    }
    fn add_message(&mut self, _message: Message) {}
    fn clear(&mut self) {}
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn never_stores_messages() {
        let mut memory = DummyMemory::new();
        memory.add_user_message(&"ignored");
        memory.add_ai_message(&"ignored");
        assert!(memory.messages().is_empty());
        assert_eq!(memory.to_string(), "");
    }
}