inklings 0.1.0

A unified Rust API for various Large Language Model (LLM) providers
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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

use async_trait::async_trait;
use serde_json::json;
use crate::types::{Error, Message, Role};
use super::Provider;
use futures::{Stream, StreamExt};
use eventsource_stream::Eventsource;
use std::pin::Pin;

pub struct OpenAIProvider {
    api_key: String,
    client: reqwest::Client,
    model: String,
}

impl OpenAIProvider {
    pub fn new(api_key: String, model: Option<String>) -> Self {
        Self {
            api_key,
            client: reqwest::Client::new(),
            model: model.unwrap_or_else(|| "gpt-4o-mini".to_string()),
        }
    }

    fn convert_role(role: &Role) -> &'static str {
        match role {
            Role::System => "system",
            Role::User => "user",
            Role::Assistant => "assistant",
        }
    }
}

#[async_trait]
impl Provider for OpenAIProvider {
    async fn complete(&self, prompt: &str) -> Result<String, Error> {
        let messages = vec![Message {
            role: Role::User,
            content: prompt.to_string(),
        }];
        self.chat(messages).await
    }

    async fn chat(&self, messages: Vec<Message>) -> Result<String, Error> {
        let messages: Vec<serde_json::Value> = messages
            .iter()
            .map(|m| {
                json!({
                    "role": Self::convert_role(&m.role),
                    "content": m.content
                })
            })
            .collect();

        let response = self
            .client
            .post("https://api.openai.com/v1/chat/completions")
            .header("Authorization", format!("Bearer {}", self.api_key))
            .json(&json!({
                "model": self.model,
                "messages": messages,
            }))
            .send()
            .await?;

        if !response.status().is_success() {
            return Err(Error::ProviderError(format!(
                "OpenAI API error: {}",
                response.text().await?
            )));
        }

        let response: serde_json::Value = response.json().await?;
        Ok(response["choices"][0]["message"]["content"]
            .as_str()
            .ok_or_else(|| Error::ProviderError("Invalid response format".to_string()))?
            .to_string())
    }

    async fn stream_chat(&self, messages: Vec<Message>) -> Result<Pin<Box<dyn Stream<Item = Result<String, Error>> + Send>>, Error> {
        let messages: Vec<serde_json::Value> = messages
            .iter()
            .map(|m| {
                json!({
                    "role": Self::convert_role(&m.role),
                    "content": m.content
                })
            })
            .collect();

        let response = self
            .client
            .post("https://api.openai.com/v1/chat/completions")
            .header("Authorization", format!("Bearer {}", self.api_key))
            .json(&json!({
                "model": self.model,
                "messages": messages,
                "stream": true,
            }))
            .send()
            .await?;

        if !response.status().is_success() {
            return Err(Error::ProviderError(format!(
                "OpenAI API error: {}",
                response.text().await?
            )));
        }

        Ok(Box::pin(response
            .bytes_stream()
            .eventsource()
            .map(|event| {
                event
                    .map_err(|e| Error::ProviderError(e.to_string()))
                    .and_then(|event| {
                        let data = event.data;
                        if data == "[DONE]" {
                            return Ok("".to_string());
                        }
                        let json: serde_json::Value = serde_json::from_str(&data)
                            .map_err(|e| Error::ProviderError(e.to_string()))?;
                        Ok(json["choices"][0]["delta"]["content"]
                            .as_str()
                            .unwrap_or("")
                            .to_string())
                    })
            })
            .filter(|result| futures::future::ready(!matches!(result, Ok(s) if s.is_empty())))))
    }
}