gproxy-protocol

Wire-format types and endpoint metadata for the OpenAI, Anthropic Claude, and Google Gemini APIs.

gproxy-protocol is the protocol layer used by GPROXY. It provides serializable request, response, streaming-event, and shared operation types without coupling them to an HTTP client or server implementation. Dependencies are serde, serde_json, and http — nothing else, and it builds for wasm32.

Usage

[dependencies]
gproxy-protocol = "=2.3.2"

use gproxy_protocol::{
    ContentGenerationKind, Operation, OperationKey, Provider, request_target,
};

let key = OperationKey::content_generation(
    Operation::StreamGenerateContent,
    ContentGenerationKind::ClaudeMessages,
);

assert_eq!(key.kind().provider(), Provider::Claude);

// Method + path for this operation against the target provider.
let target = request_target(key, "claude-sonnet-4-5", true)?;

Layout

• gproxy_protocol::openai — chat completions, responses, embeddings, images, models, conversations, compaction.
• gproxy_protocol::claude — messages, count tokens, models.
• gproxy_protocol::gemini — generateContent, embeddings, caching, batch, count tokens, models.
• Root re-exports — the shared taxonomy: Provider, Operation, OperationGroup, OperationKind, ContentGenerationKind, OperationKey, plus Endpoint / HttpMethod / request_target endpoint metadata.

These modules model provider wire shapes only. Conversion between them lives in gproxy-transform.

Compatibility

The crate version tracks the GPROXY release it ships with, so a minor bump can carry additive wire-type changes. Public wire structs and enums are #[non_exhaustive]: construct named structs through their generated Type::builder() or the gproxy_protocol::wire! helper, and include a wildcard arm when matching enums. Lockstep GPROXY crates use exact dependency versions; downstreams that combine protocol and transform should pin the same exact version as well.

OperationKey protects the operation/kind invariant. Its fields are private; read them with operation() / kind() and construct keys with content_generation, provider, or checked try_new.

request_target accepts a raw model id, encodes it as one path/query component, and returns a structured error for inconsistent or unsupported combinations.

License

Licensed under the MIT License.