mentra 0.6.0

An agent runtime for tool-using LLM applications
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
131
132
133
134
135
136
137

use async_trait::async_trait;
use url::Url;

mod model;
mod sse;

use crate::{
    BuiltinProvider,
    provider::{
        Provider,
        model::{ModelInfo, ProviderDescriptor, ProviderError, ProviderEventStream, Request},
    },
};

const DEFAULT_BASE_URL: &str = "https://generativelanguage.googleapis.com/";

#[derive(Clone)]
pub struct GeminiProvider {
    client: reqwest::Client,
    base_url: Url,
}

impl GeminiProvider {
    pub fn new(api_key: impl Into<String>) -> Self {
        let mut headers = reqwest::header::HeaderMap::new();
        headers.insert(
            "x-goog-api-key",
            api_key
                .into()
                .parse()
                .expect("Failed to parse Gemini API key"),
        );

        Self {
            client: reqwest::Client::builder()
                .default_headers(headers)
                .build()
                .expect("Failed to build client"),
            base_url: Url::parse(DEFAULT_BASE_URL).expect("Failed to parse default base URL"),
        }
    }
}

#[async_trait]
impl Provider for GeminiProvider {
    fn descriptor(&self) -> ProviderDescriptor {
        ProviderDescriptor {
            id: BuiltinProvider::Gemini.into(),
            display_name: Some("Gemini".to_string()),
            description: Some("Google Gemini Developer API provider".to_string()),
        }
    }

    async fn list_models(&self) -> Result<Vec<ModelInfo>, ProviderError> {
        let mut models = Vec::new();
        let mut page_token = None::<String>;

        loop {
            let mut request = self
                .client
                .get(
                    self.base_url
                        .join("v1beta/models")
                        .expect("Failed to join Gemini models URL"),
                )
                .query(&[("pageSize", "1000")]);

            if let Some(token) = page_token.as_deref() {
                request = request.query(&[("pageToken", token)]);
            }

            let response = request.send().await.map_err(ProviderError::Transport)?;
            if !response.status().is_success() {
                return Err(ProviderError::Http {
                    status: response.status(),
                    body: response.text().await.unwrap_or_default(),
                });
            }

            let page = response
                .json::<model::GeminiModelsPage>()
                .await
                .map_err(ProviderError::Decode)?;

            models.extend(
                page.models
                    .into_iter()
                    .filter(|model| model.supports_generate_content())
                    .map(ModelInfo::from),
            );

            page_token = page.next_page_token;
            if page_token.is_none() {
                break;
            }
        }

        Ok(models)
    }

    async fn stream(&self, request: Request<'_>) -> Result<ProviderEventStream, ProviderError> {
        let model_name = request.model.to_string();
        let request = model::GeminiGenerateContentRequest::try_from(request)?;
        let response = self
            .client
            .post(
                self.base_url
                    .join(&format!(
                        "v1beta/{}:streamGenerateContent",
                        normalize_model_name(&model_name)
                    ))
                    .expect("Failed to join Gemini stream URL"),
            )
            .query(&[("alt", "sse")])
            .json(&request)
            .send()
            .await
            .map_err(ProviderError::Transport)?;

        if !response.status().is_success() {
            return Err(ProviderError::Http {
                status: response.status(),
                body: response.text().await.unwrap_or_default(),
            });
        }

        Ok(sse::spawn_event_stream(response, model_name))
    }
}

fn normalize_model_name(model: &str) -> String {
    if model.starts_with("models/") {
        model.to_string()
    } else {
        format!("models/{model}")
    }
}