Add the text_embeddings API

src/client.rs

@@ -8,6 +8,7 @@ use crate::dialogue::{Message, Role};
 use crate::error::{Error, Result};
 use crate::prelude::{
     Candidate, Content, GenerateContentRequest, GenerateContentResponse, GenerationConfig,
+    TextEmbeddingRequest, TextEmbeddingResponse,
 };
 use crate::{prelude::Part, token_provider::TokenProvider};
 
@@ -171,4 +172,26 @@ impl<T: TokenProvider + Clone> GeminiClient<T> {
             }
         }
     }
+
+    pub async fn text_embeddings(
+        &self,
+        request: &TextEmbeddingRequest,
+    ) -> Result<TextEmbeddingResponse> {
+        let model = "textembedding-gecko@003";
+        let endpoint_url = format!(
+            "https://{}/v1/projects/{}/locations/{}/publishers/google/models/{}:predict",
+            self.api_endpoint, self.project_id, self.location_id, model,
+        );
+        let access_token = self.token_provider.get_token(AUTH_SCOPE).await?;
+        let resp = self
+            .client
+            .post(&endpoint_url)
+            .bearer_auth(access_token)
+            .json(&request)
+            .send()
+            .await?;
+        let txt_json = resp.text().await?;
+        println!("{}", txt_json);
+        Ok(serde_json::from_str::<TextEmbeddingResponse>(&txt_json)?)
+    }
 }

src/types/mod.rs

@@ -2,8 +2,10 @@ mod common;
 mod count_tokens;
 mod error;
 mod generate_content;
+mod text_embeddings;
 
 pub use common::*;
 pub use count_tokens::*;
 pub use error::*;
 pub use generate_content::*;
+pub use text_embeddings::*;

src/types/text_embeddings.rs

@@ -0,0 +1,43 @@
+use serde::{Deserialize, Serialize};
+
+use super::Error;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct TextEmbeddingRequest {
+    pub instances: Vec<TextEmbeddingRequestInstance>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct TextEmbeddingRequestInstance {
+    pub content: String,
+    pub task_type: String,
+    pub title: String,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TextEmbeddingResponse {
+    Ok {
+        predictions: Vec<TextEmbeddingPrediction>,
+    },
+    Error {
+        error: Error,
+    },
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct TextEmbeddingPrediction {
+    pub embeddings: TextEmbeddingResult,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct TextEmbeddingResult {
+    statistics: TextEmbeddingStatistics,
+    values: Vec<f32>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct TextEmbeddingStatistics {
+    truncated: bool,
+    token_count: u32,
+}