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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223

pub use multilink::http::*;

use multilink::{
    error::ProtocolErrorType,
    http::hyper::{Body, Method, StatusCode, Uri},
    http::util::{
        notification_sse_response, notification_sse_stream, parse_request, parse_response,
        serialize_to_http_request, serialize_to_http_response, validate_method,
    },
    util::parse_from_value,
    ProtocolError, ServiceResponse,
};
use serde_json::Value;

use crate::service::{BackendRequest, BackendResponse, CoreRequest, CoreResponse};

const GENERATE_PATH: &str = "/generate";
const GENERATE_STREAM_PATH: &str = "/generate_stream";
const GET_LAST_THREAD_INFO_METHOD: &str = "/threads/last";
const GET_THREAD_MESSAGES_METHOD_PREFIX: &str = "/threads/";
const GET_ALL_THREAD_INFOS_METHOD: &str = "/threads";

#[async_trait::async_trait]
impl RequestHttpConvert<CoreRequest> for CoreRequest {
    async fn from_http_request(request: HttpRequest<Body>) -> Result<Option<Self>, ProtocolError> {
        let path = request.uri().path();
        let request = match path {
            GENERATE_PATH => {
                validate_method(&request, Method::POST)?;
                CoreRequest::Generation(parse_request(request).await?)
            }
            GENERATE_STREAM_PATH => {
                validate_method(&request, Method::POST)?;
                CoreRequest::GenerationStream(parse_request(request).await?)
            }
            GET_ALL_THREAD_INFOS_METHOD => {
                validate_method(&request, Method::GET)?;
                CoreRequest::GetAllThreadInfos
            }
            GET_LAST_THREAD_INFO_METHOD => {
                validate_method(&request, Method::GET)?;
                CoreRequest::GetLastThreadInfo
            }
            _ => {
                if !path.starts_with(GET_THREAD_MESSAGES_METHOD_PREFIX)
                    || request.method() != &Method::GET
                    || path.split(&['/', '\\']).count() != 2
                {
                    return Ok(None);
                }
                let id = path.split(&['/', '\\']).nth(1).unwrap();
                CoreRequest::GetThreadMessages { id: id.to_string() }
            }
        };
        Ok(Some(request))
    }

    fn to_http_request(&self, base_url: &Uri) -> Result<Option<HttpRequest<Body>>, ProtocolError> {
        let request = match self {
            CoreRequest::Generation(request) => {
                serialize_to_http_request(base_url, GENERATE_PATH, Method::POST, &request)?
            }
            CoreRequest::GenerationStream(request) => {
                serialize_to_http_request(base_url, GENERATE_STREAM_PATH, Method::POST, &request)?
            }
            CoreRequest::GetLastThreadInfo => serialize_to_http_request(
                base_url,
                GET_LAST_THREAD_INFO_METHOD,
                Method::GET,
                &Value::Null,
            )?,
            CoreRequest::GetAllThreadInfos => serialize_to_http_request(
                base_url,
                GET_ALL_THREAD_INFOS_METHOD,
                Method::GET,
                &Value::Null,
            )?,
            CoreRequest::GetThreadMessages { id } => {
                serialize_to_http_request(base_url, GET_ALL_THREAD_INFOS_METHOD, Method::GET, &id)?
            }
            _ => return Ok(None),
        };
        Ok(Some(request))
    }
}

#[async_trait::async_trait]
impl ResponseHttpConvert<CoreRequest, CoreResponse> for CoreResponse {
    async fn from_http_response(
        response: ModalHttpResponse,
        original_request: &CoreRequest,
    ) -> Result<Option<ServiceResponse<Self>>, ProtocolError> {
        Ok(Some(match response {
            ModalHttpResponse::Single(response) => match original_request {
                CoreRequest::Generation(_) => ServiceResponse::Single(CoreResponse::Generation(
                    parse_response(response).await?,
                )),
                CoreRequest::GenerationStream(_) => ServiceResponse::Multiple(
                    notification_sse_stream(original_request.clone(), response),
                ),
                CoreRequest::GetLastThreadInfo => ServiceResponse::Single(
                    CoreResponse::GetLastThreadInfo(parse_response(response).await?),
                ),
                CoreRequest::GetAllThreadInfos => ServiceResponse::Single(
                    CoreResponse::GetAllThreadInfos(parse_response(response).await?),
                ),
                CoreRequest::GetThreadMessages { .. } => ServiceResponse::Single(
                    CoreResponse::GetThreadMessages(parse_response(response).await?),
                ),
                _ => return Ok(None),
            },
            ModalHttpResponse::Event(event) => ServiceResponse::Single(match original_request {
                CoreRequest::GenerationStream(_) => {
                    CoreResponse::GenerationStream(parse_from_value(event)?)
                }
                _ => return Ok(None),
            }),
        }))
    }

    fn to_http_response(
        response: ServiceResponse<Self>,
    ) -> Result<Option<ModalHttpResponse>, ProtocolError> {
        let response = match response {
            ServiceResponse::Single(response) => match response {
                CoreResponse::Generation(response) => ModalHttpResponse::Single(
                    serialize_to_http_response(&response, StatusCode::OK)?,
                ),
                CoreResponse::GenerationStream(response) => {
                    ModalHttpResponse::Event(serde_json::to_value(response).unwrap())
                }
                CoreResponse::GetLastThreadInfo(response) => ModalHttpResponse::Single(
                    serialize_to_http_response(&response, StatusCode::OK)?,
                ),
                CoreResponse::GetAllThreadInfos(response) => ModalHttpResponse::Single(
                    serialize_to_http_response(&response, StatusCode::OK)?,
                ),
                CoreResponse::GetThreadMessages(response) => ModalHttpResponse::Single(
                    serialize_to_http_response(&response, StatusCode::OK)?,
                ),
                _ => return Ok(None),
            },
            ServiceResponse::Multiple(stream) => {
                ModalHttpResponse::Single(notification_sse_response(stream))
            }
        };
        Ok(Some(response))
    }
}

#[async_trait::async_trait]
impl RequestHttpConvert<BackendRequest> for BackendRequest {
    async fn from_http_request(request: HttpRequest<Body>) -> Result<Option<Self>, ProtocolError> {
        let request = match request.uri().path() {
            GENERATE_PATH => match request.method() == &Method::POST {
                true => BackendRequest::Generation(parse_request(request).await?),
                false => return Err(generic_error(ProtocolErrorType::HttpMethodNotAllowed).into()),
            },
            GENERATE_STREAM_PATH => match request.method() == &Method::POST {
                true => BackendRequest::GenerationStream(parse_request(request).await?),
                false => return Err(generic_error(ProtocolErrorType::HttpMethodNotAllowed).into()),
            },
            _ => return Ok(None),
        };
        Ok(Some(request))
    }

    fn to_http_request(&self, base_url: &Uri) -> Result<Option<HttpRequest<Body>>, ProtocolError> {
        let request = match self {
            BackendRequest::Generation(request) => {
                serialize_to_http_request(base_url, GENERATE_PATH, Method::POST, &request)?
            }
            BackendRequest::GenerationStream(request) => {
                serialize_to_http_request(base_url, GENERATE_STREAM_PATH, Method::POST, &request)?
            }
        };
        Ok(Some(request))
    }
}

#[async_trait::async_trait]
impl ResponseHttpConvert<BackendRequest, BackendResponse> for BackendResponse {
    async fn from_http_response(
        response: ModalHttpResponse,
        original_request: &BackendRequest,
    ) -> Result<Option<ServiceResponse<Self>>, ProtocolError> {
        let response = match response {
            ModalHttpResponse::Single(response) => match original_request {
                BackendRequest::Generation(_) => ServiceResponse::Single(
                    BackendResponse::Generation(parse_response(response).await?),
                ),
                BackendRequest::GenerationStream(_) => ServiceResponse::Multiple(
                    notification_sse_stream(original_request.clone(), response),
                ),
            },
            ModalHttpResponse::Event(event) => ServiceResponse::Single(match original_request {
                BackendRequest::GenerationStream(_) => {
                    BackendResponse::GenerationStream(parse_from_value(event)?)
                }
                _ => return Ok(None),
            }),
        };
        Ok(Some(response))
    }

    fn to_http_response(
        response: ServiceResponse<Self>,
    ) -> Result<Option<ModalHttpResponse>, ProtocolError> {
        Ok(Some(match response {
            ServiceResponse::Single(response) => match response {
                BackendResponse::Generation(response) => ModalHttpResponse::Single(
                    serialize_to_http_response(&response, StatusCode::OK)?,
                ),
                BackendResponse::GenerationStream(response) => {
                    ModalHttpResponse::Event(serde_json::to_value(response).unwrap())
                }
            },
            ServiceResponse::Multiple(stream) => {
                ModalHttpResponse::Single(notification_sse_response(stream))
            }
        }))
    }
}