improve endpoint support (#1577)

small PR to add a new interface endpoint behind a feature

router/Cargo.toml

@@ -52,3 +52,4 @@ vergen = { version = "8.2.5", features = ["build", "git", "gitcl"] }
 [features]
 default = ["ngrok"]
 ngrok = ["dep:ngrok"]
+google = []

router/src/lib.rs

@@ -20,6 +20,25 @@ pub(crate) type GenerateStreamResponse = (
     UnboundedReceiverStream<Result<InferStreamResponse, InferError>>,
 );
 
+#[derive(Clone, Deserialize, ToSchema)]
+pub(crate) struct VertexInstance {
+    #[schema(example = "What is Deep Learning?")]
+    pub inputs: String,
+    #[schema(nullable = true, default = "null", example = "null")]
+    pub parameters: Option<GenerateParameters>,
+}
+
+#[derive(Deserialize, ToSchema)]
+pub(crate) struct VertexRequest {
+    #[serde(rename = "instances")]
+    pub instances: Vec<VertexInstance>,
+}
+
+#[derive(Clone, Deserialize, ToSchema, Serialize)]
+pub(crate) struct VertexResponse {
+    pub predictions: Vec<String>,
+}
+
 /// Hub type
 #[derive(Clone, Debug, Deserialize)]
 pub struct HubModelInfo {
@@ -70,7 +89,7 @@ mod json_object_or_string_to_string {
     }
 }
 
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Clone, Debug, Deserialize, ToSchema)]
 #[serde(tag = "type", content = "value")]
 pub(crate) enum GrammarType {
     #[serde(
@@ -153,7 +172,7 @@ pub struct Info {
     pub docker_label: Option<&'static str>,
 }
 
-#[derive(Clone, Debug, Deserialize, ToSchema)]
+#[derive(Clone, Debug, Deserialize, ToSchema, Default)]
 pub(crate) struct GenerateParameters {
     #[serde(default)]
     #[schema(exclusive_minimum = 0, nullable = true, default = "null", example = 1)]

router/src/main.rs

@@ -328,6 +328,15 @@ async fn main() -> Result<(), RouterError> {
     tracing::info!("Setting max batch total tokens to {max_supported_batch_total_tokens}");
     tracing::info!("Connected");
 
+    // Determine the server port based on the feature and environment variable.
+    let port = if cfg!(feature = "google") {
+        std::env::var("AIP_HTTP_PORT")
+            .map(|aip_http_port| aip_http_port.parse::<u16>().unwrap_or(port))
+            .unwrap_or(port)
+    } else {
+        port
+    };
+
     let addr = match hostname.parse() {
         Ok(ip) => SocketAddr::new(ip, port),
         Err(_) => {

router/src/server.rs

@@ -5,9 +5,9 @@ use crate::validation::ValidationError;
 use crate::{
     BestOfSequence, ChatCompletion, ChatCompletionChoice, ChatCompletionChunk, ChatCompletionDelta,
     ChatCompletionLogprobs, ChatRequest, CompatGenerateRequest, Details, ErrorResponse,
-    FinishReason, GenerateParameters, GenerateRequest, GenerateResponse, HubModelInfo,
+    FinishReason, GenerateParameters, GenerateRequest, GenerateResponse, GrammarType, HubModelInfo,
     HubTokenizerConfig, Infer, Info, Message, PrefillToken, SimpleToken, StreamDetails,
-    StreamResponse, Token, TokenizeResponse, Validation,
+    StreamResponse, Token, TokenizeResponse, Validation, VertexRequest, VertexResponse,
 };
 use axum::extract::Extension;
 use axum::http::{HeaderMap, Method, StatusCode};
@@ -16,8 +16,10 @@ use axum::response::{IntoResponse, Response};
 use axum::routing::{get, post};
 use axum::{http, Json, Router};
 use axum_tracing_opentelemetry::middleware::OtelAxumLayer;
+use futures::stream::FuturesUnordered;
 use futures::stream::StreamExt;
 use futures::Stream;
+use futures::TryStreamExt;
 use metrics_exporter_prometheus::{Matcher, PrometheusBuilder, PrometheusHandle};
 use std::convert::Infallible;
 use std::net::SocketAddr;
@@ -693,6 +695,97 @@ async fn chat_completions(
     }
 }
 
+/// Generate tokens from Vertex request
+#[utoipa::path(
+    post,
+    tag = "Text Generation Inference",
+    path = "/vertex",
+    request_body = VertexRequest,
+    responses(
+    (status = 200, description = "Generated Text", body = VertexResponse),
+    (status = 424, description = "Generation Error", body = ErrorResponse,
+    example = json ! ({"error": "Request failed during generation"})),
+    (status = 429, description = "Model is overloaded", body = ErrorResponse,
+    example = json ! ({"error": "Model is overloaded"})),
+    (status = 422, description = "Input validation error", body = ErrorResponse,
+    example = json ! ({"error": "Input validation error"})),
+    (status = 500, description = "Incomplete generation", body = ErrorResponse,
+    example = json ! ({"error": "Incomplete generation"})),
+    )
+    )]
+#[instrument(
+    skip_all,
+    fields(
+        total_time,
+        validation_time,
+        queue_time,
+        inference_time,
+        time_per_token,
+        seed,
+    )
+)]
+async fn vertex_compatibility(
+    Extension(infer): Extension<Infer>,
+    Extension(compute_type): Extension<ComputeType>,
+    Json(req): Json<VertexRequest>,
+) -> Result<Response, (StatusCode, Json<ErrorResponse>)> {
+    metrics::increment_counter!("tgi_request_count");
+
+    // check that theres at least one instance
+    if req.instances.is_empty() {
+        return Err((
+            StatusCode::UNPROCESSABLE_ENTITY,
+            Json(ErrorResponse {
+                error: "Input validation error".to_string(),
+                error_type: "Input validation error".to_string(),
+            }),
+        ));
+    }
+
+    // Process all instances
+    let predictions = req
+        .instances
+        .iter()
+        .map(|instance| {
+            let generate_request = GenerateRequest {
+                inputs: instance.inputs.clone(),
+                parameters: GenerateParameters {
+                    do_sample: true,
+                    max_new_tokens: instance.parameters.as_ref().and_then(|p| p.max_new_tokens),
+                    seed: instance.parameters.as_ref().and_then(|p| p.seed),
+                    details: true,
+                    decoder_input_details: true,
+                    ..Default::default()
+                },
+            };
+
+            async {
+                generate(
+                    Extension(infer.clone()),
+                    Extension(compute_type.clone()),
+                    Json(generate_request),
+                )
+                .await
+                .map(|(_, Json(generation))| generation.generated_text)
+                .map_err(|_| {
+                    (
+                        StatusCode::INTERNAL_SERVER_ERROR,
+                        Json(ErrorResponse {
+                            error: "Incomplete generation".into(),
+                            error_type: "Incomplete generation".into(),
+                        }),
+                    )
+                })
+            }
+        })
+        .collect::<FuturesUnordered<_>>()
+        .try_collect::<Vec<_>>()
+        .await?;
+
+    let response = VertexResponse { predictions };
+    Ok((HeaderMap::new(), Json(response)).into_response())
+}
+
 /// Tokenize inputs
 #[utoipa::path(
     post,
@@ -818,6 +911,7 @@ pub async fn run(
     StreamResponse,
     StreamDetails,
     ErrorResponse,
+    GrammarType,
     )
     ),
     tags(
@@ -942,8 +1036,30 @@ pub async fn run(
         docker_label: option_env!("DOCKER_LABEL"),
     };
 
+    // Define VertextApiDoc conditionally only if the "google" feature is enabled
+    #[cfg(feature = "google")]
+    #[derive(OpenApi)]
+    #[openapi(
+        paths(vertex_compatibility),
+        components(schemas(VertexInstance, VertexRequest, VertexResponse))
+    )]
+    struct VertextApiDoc;
+
+    let doc = {
+        // avoid `mut` if possible
+        #[cfg(feature = "google")]
+        {
+            // limiting mutability to the smallest scope necessary
+            let mut doc = doc;
+            doc.merge(VertextApiDoc::openapi());
+            doc
+        }
+        #[cfg(not(feature = "google"))]
+        ApiDoc::openapi()
+    };
+
     // Configure Swagger UI
-    let swagger_ui = SwaggerUi::new("/docs").url("/api-doc/openapi.json", ApiDoc::openapi());
+    let swagger_ui = SwaggerUi::new("/docs").url("/api-doc/openapi.json", doc);
 
     // Define base and health routes
     let base_routes = Router::new()
@@ -953,6 +1069,7 @@ pub async fn run(
         .route("/generate", post(generate))
         .route("/generate_stream", post(generate_stream))
         .route("/v1/chat/completions", post(chat_completions))
+        .route("/vertex", post(vertex_compatibility))
         .route("/tokenize", post(tokenize))
         .route("/health", get(health))
         .route("/ping", get(health))
@@ -969,10 +1086,27 @@ pub async fn run(
         ComputeType(std::env::var("COMPUTE_TYPE").unwrap_or("gpu+optimized".to_string()));
 
     // Combine routes and layers
-    let app = Router::new()
+    let mut app = Router::new()
         .merge(swagger_ui)
         .merge(base_routes)
-        .merge(aws_sagemaker_route)
+        .merge(aws_sagemaker_route);
+
+    #[cfg(feature = "google")]
+    {
+        tracing::info!("Built with `google` feature");
+        tracing::info!(
+            "Environment variables `AIP_PREDICT_ROUTE` and `AIP_HEALTH_ROUTE` will be respected."
+        );
+        if let Ok(env_predict_route) = std::env::var("AIP_PREDICT_ROUTE") {
+            app = app.route(&env_predict_route, post(vertex_compatibility));
+        }
+        if let Ok(env_health_route) = std::env::var("AIP_HEALTH_ROUTE") {
+            app = app.route(&env_health_route, get(health));
+        }
+    }
+
+    // add layers after routes
+    app = app
         .layer(Extension(info))
         .layer(Extension(health_ext.clone()))
         .layer(Extension(compat_return_full_text))