gproxy_protocol/protocol/
endpoint.rs

1//! Target endpoint synthesis (M2): the provider-relative method/path/query a
2//! transformed request must hit for a given operation key. Passthrough keeps
3//! the inbound target and never calls this.
4
5use crate::protocol::operation::{
6    ContentGenerationKind, HttpMethod, Operation, OperationKey, OperationKind, Provider,
7};
8
9/// Provider-relative request target for a wired operation.
10#[derive(Debug, Clone, PartialEq, Eq)]
11pub struct RequestTarget {
12    pub method: HttpMethod,
13    pub path: String,
14    /// Extra query the wire format requires (e.g. gemini `alt=sse`).
15    pub query: Option<String>,
16}
17
18impl RequestTarget {
19    fn get(path: impl Into<String>) -> Self {
20        Self {
21            method: HttpMethod::Get,
22            path: path.into(),
23            query: None,
24        }
25    }
26
27    fn post(path: impl Into<String>) -> Self {
28        Self {
29            method: HttpMethod::Post,
30            path: path.into(),
31            query: None,
32        }
33    }
34}
35
36/// Build the upstream request target for any wired operation key. `model` is
37/// the upstream model id (path-templated providers embed it); `stream` selects
38/// the streaming variant where the wire format distinguishes it by endpoint.
39pub fn request_target(target: OperationKey, model: &str, stream: bool) -> RequestTarget {
40    use Provider as P;
41    let provider = match target.kind {
42        OperationKind::ContentGeneration(kind) => return content_target(kind, model, stream),
43        OperationKind::Provider(provider) => provider,
44    };
45    match (target.operation, provider) {
46        (Operation::ListModels, P::OpenAi | P::Claude) => RequestTarget::get("/v1/models"),
47        (Operation::ListModels, P::Gemini) => RequestTarget::get("/v1beta/models"),
48        (Operation::GetModel, P::OpenAi | P::Claude) => {
49            RequestTarget::get(format!("/v1/models/{model}"))
50        }
51        (Operation::GetModel, P::Gemini) => RequestTarget::get(format!("/v1beta/models/{model}")),
52        (Operation::CountTokens, P::OpenAi) => RequestTarget::post("/v1/responses/input_tokens"),
53        (Operation::CountTokens, P::Claude) => RequestTarget::post("/v1/messages/count_tokens"),
54        (Operation::CountTokens, P::Gemini) => {
55            RequestTarget::post(format!("/v1beta/models/{model}:countTokens"))
56        }
57        // Claude has no embeddings endpoint (no transform pair targets it);
58        // the OpenAI-shaped path is a harmless placeholder.
59        (Operation::CreateEmbedding, P::OpenAi | P::Claude) => {
60            RequestTarget::post("/v1/embeddings")
61        }
62        // single-embed form; batch (`:batchEmbedContents`) is a separate op
63        (Operation::CreateEmbedding, P::Gemini) => {
64            RequestTarget::post(format!("/v1beta/models/{model}:embedContent"))
65        }
66        // OpenAI-only families: cross-op routing targets carry a
67        // content-generation kind and take the content arm above, so other
68        // providers never reach these rows; the OpenAI path is the one target.
69        (Operation::CreateImage, _) => RequestTarget::post("/v1/images/generations"),
70        (Operation::EditImage, _) => RequestTarget::post("/v1/images/edits"),
71        (Operation::CompactContent, _) => RequestTarget::post("/v1/responses/compact"),
72        (Operation::CreateConversation, _) => RequestTarget::post("/v1/conversations"),
73        // Content ops never carry a bare Provider kind (constructor
74        // invariant); synthesize the provider's content path defensively.
75        (Operation::GenerateContent | Operation::StreamGenerateContent, p) => {
76            let kind = match p {
77                P::OpenAi => ContentGenerationKind::OpenAiResponses,
78                P::Claude => ContentGenerationKind::ClaudeMessages,
79                P::Gemini => ContentGenerationKind::GeminiGenerateContent,
80            };
81            content_target(kind, model, stream)
82        }
83    }
84}
85
86/// Content-generation targets (POST; gemini selects the verb by `stream`).
87fn content_target(kind: ContentGenerationKind, model: &str, stream: bool) -> RequestTarget {
88    use ContentGenerationKind as K;
89    match kind {
90        K::OpenAiChatCompletions => RequestTarget::post("/v1/chat/completions"),
91        K::OpenAiResponses => RequestTarget::post("/v1/responses"),
92        K::OpenAiResponsesWebSocket => RequestTarget::get("/v1/responses"),
93        K::ClaudeMessages => RequestTarget::post("/v1/messages"),
94        K::GeminiGenerateContent => {
95            let verb = if stream {
96                "streamGenerateContent"
97            } else {
98                "generateContent"
99            };
100            RequestTarget {
101                method: HttpMethod::Post,
102                path: format!("/v1beta/models/{model}:{verb}"),
103                query: stream.then(|| "alt=sse".to_owned()),
104            }
105        }
106    }
107}
gproxy_protocol/protocol/endpoint.rs

gproxy_protocol/protocol/
endpoint.rs
