Allow using system instructions

src/client.rs

@@ -127,6 +127,7 @@ impl<T: TokenProvider + Clone> GeminiClient<T> {
                 .collect(),
             generation_config: None,
             tools: None,
+            system_instruction: None,
         };
 
         let response = self.generate_content(&request, model).await?;
@@ -154,6 +155,7 @@ impl<T: TokenProvider + Clone> GeminiClient<T> {
             }],
             generation_config: generation_config.cloned(),
             tools: None,
+            system_instruction: None,
         };
 
         let response = self.generate_content(&request, "gemini-pro").await?;

src/types/error.rs

@@ -22,10 +22,22 @@ pub enum ErrorType {
 
     #[serde(rename = "type.googleapis.com/google.rpc.Help")]
     Help { links: Vec<Link> },
+
+    #[serde(rename = "type.googleapis.com/google.rpc.BadRequest")]
+    BadRequest {
+        #[serde(rename = "fieldViolations")]
+        field_violations: Vec<FieldViolation>,
+    },
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct ErrorInfoMetadata {
-    service: String,
-    consumer: String,
+    pub service: String,
+    pub consumer: String,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct FieldViolation {
+    pub field: String,
+    pub description: String,
 }

src/types/generate_content.rs

@@ -4,11 +4,12 @@ use serde::{Deserialize, Serialize};
 
 use super::{Content, Error, Part};
 
-#[derive(Clone, Serialize, Deserialize)]
+#[derive(Clone, Default, Serialize, Deserialize)]
 pub struct GenerateContentRequest {
     pub contents: Vec<Content>,
     pub generation_config: Option<GenerationConfig>,
     pub tools: Option<Vec<Tools>>,
+    pub system_instruction: Option<Content>,
 }
 
 impl GenerateContentRequest {
@@ -20,6 +21,7 @@ impl GenerateContentRequest {
             }],
             generation_config,
             tools: None,
+            system_instruction: None,
         }
     }
 }