use super::{
access_token::*, catch_error, json_stream, message::*, patch_system_message, Client,
CompletionData, CompletionOutput, ExtraConfig, Model, ModelData, ModelPatches, PromptAction,
PromptKind, SseHandler, ToolCall, VertexAIClient,
};
use anyhow::{anyhow, bail, Context, Result};
use async_trait::async_trait;
use chrono::{Duration, Utc};
use reqwest::{Client as ReqwestClient, RequestBuilder};
use serde::Deserialize;
use serde_json::{json, Value};
use std::path::PathBuf;
#[derive(Debug, Clone, Deserialize, Default)]
pub struct VertexAIConfig {
pub name: Option<String>,
pub project_id: Option<String>,
pub location: Option<String>,
pub adc_file: Option<String>,
#[serde(rename = "safetySettings")]
pub safety_settings: Option<Value>,
#[serde(default)]
pub models: Vec<ModelData>,
pub patches: Option<ModelPatches>,
pub extra: Option<ExtraConfig>,
}
impl VertexAIClient {
config_get_fn!(project_id, get_project_id);
config_get_fn!(location, get_location);
pub const PROMPTS: [PromptAction<'static>; 2] = [
("project_id", "Project ID", true, PromptKind::String),
("location", "Location", true, PromptKind::String),
];
fn request_builder(
&self,
client: &ReqwestClient,
data: CompletionData,
) -> Result<RequestBuilder> {
let project_id = self.get_project_id()?;
let location = self.get_location()?;
let access_token = get_access_token(self.name())?;
let base_url = format!("https://{location}-aiplatform.googleapis.com/v1/projects/{project_id}/locations/{location}/publishers");
let func = match data.stream {
true => "streamGenerateContent",
false => "generateContent",
};
let url = format!("{base_url}/google/models/{}:{func}", self.model.name());
let mut body = gemini_build_body(data, &self.model)?;
self.patch_request_body(&mut body);
debug!("VertexAI Request: {url} {body}");
let builder = client.post(url).bearer_auth(access_token).json(&body);
Ok(builder)
}
}
#[async_trait]
impl Client for VertexAIClient {
client_common_fns!();
async fn send_message_inner(
&self,
client: &ReqwestClient,
data: CompletionData,
) -> Result<CompletionOutput> {
prepare_gcloud_access_token(client, self.name(), &self.config.adc_file).await?;
let builder = self.request_builder(client, data)?;
gemini_send_message(builder).await
}
async fn send_message_streaming_inner(
&self,
client: &ReqwestClient,
handler: &mut SseHandler,
data: CompletionData,
) -> Result<()> {
prepare_gcloud_access_token(client, self.name(), &self.config.adc_file).await?;
let builder = self.request_builder(client, data)?;
gemini_send_message_streaming(builder, handler).await
}
}
pub async fn gemini_send_message(builder: RequestBuilder) -> Result<CompletionOutput> {
let res = builder.send().await?;
let status = res.status();
let data: Value = res.json().await?;
if !status.is_success() {
catch_error(&data, status.as_u16())?;
}
debug!("non-stream-data: {data}");
gemini_extract_completion_text(&data)
}
pub async fn gemini_send_message_streaming(
builder: RequestBuilder,
handler: &mut SseHandler,
) -> Result<()> {
let res = builder.send().await?;
let status = res.status();
if !status.is_success() {
let data: Value = res.json().await?;
catch_error(&data, status.as_u16())?;
} else {
let handle = |value: &str| -> Result<()> {
let data: Value = serde_json::from_str(value)?;
debug!("stream-data: {data}");
if let Some(text) = data["candidates"][0]["content"]["parts"][0]["text"].as_str() {
if !text.is_empty() {
handler.text(text)?;
}
} else if let Some("SAFETY") = data["promptFeedback"]["blockReason"]
.as_str()
.or_else(|| data["candidates"][0]["finishReason"].as_str())
{
bail!("Content Blocked")
} else if let Some(parts) = data["candidates"][0]["content"]["parts"].as_array() {
for part in parts {
if let (Some(name), Some(args)) = (
part["functionCall"]["name"].as_str(),
part["functionCall"]["args"].as_object(),
) {
handler.tool_call(ToolCall::new(name.to_string(), json!(args), None))?;
}
}
}
Ok(())
};
json_stream(res.bytes_stream(), handle).await?;
}
Ok(())
}
fn gemini_extract_completion_text(data: &Value) -> Result<CompletionOutput> {
let text = data["candidates"][0]["content"]["parts"][0]["text"]
.as_str()
.unwrap_or_default();
let mut tool_calls = vec![];
if let Some(parts) = data["candidates"][0]["content"]["parts"].as_array() {
tool_calls = parts
.iter()
.filter_map(|part| {
if let (Some(name), Some(args)) = (
part["functionCall"]["name"].as_str(),
part["functionCall"]["args"].as_object(),
) {
Some(ToolCall::new(name.to_string(), json!(args), None))
} else {
None
}
})
.collect()
}
if text.is_empty() && tool_calls.is_empty() {
if let Some("SAFETY") = data["promptFeedback"]["blockReason"]
.as_str()
.or_else(|| data["candidates"][0]["finishReason"].as_str())
{
bail!("Content Blocked")
} else {
bail!("Invalid response data: {data}");
}
}
let output = CompletionOutput {
text: text.to_string(),
tool_calls,
id: None,
input_tokens: data["usageMetadata"]["promptTokenCount"].as_u64(),
output_tokens: data["usageMetadata"]["candidatesTokenCount"].as_u64(),
};
Ok(output)
}
pub(crate) fn gemini_build_body(data: CompletionData, model: &Model) -> Result<Value> {
let CompletionData {
mut messages,
temperature,
top_p,
functions,
stream: _,
} = data;
patch_system_message(&mut messages);
let mut network_image_urls = vec![];
let contents: Vec<Value> = messages
.into_iter()
.flat_map(|message| {
let Message { role, content } = message;
let role = match role {
MessageRole::User => "user",
_ => "model",
};
match content {
MessageContent::Text(text) => vec![json!({
"role": role,
"parts": [{ "text": text }]
})],
MessageContent::Array(list) => {
let parts: Vec<Value> = list
.into_iter()
.map(|item| match item {
MessageContentPart::Text { text } => json!({"text": text}),
MessageContentPart::ImageUrl { image_url: ImageUrl { url } } => {
if let Some((mime_type, data)) = url.strip_prefix("data:").and_then(|v| v.split_once(";base64,")) {
json!({ "inline_data": { "mime_type": mime_type, "data": data } })
} else {
network_image_urls.push(url.clone());
json!({ "url": url })
}
},
})
.collect();
vec![json!({ "role": role, "parts": parts })]
},
MessageContent::ToolResults((tool_call_results, _)) => {
let function_call_parts: Vec<Value> = tool_call_results.iter().map(|tool_call_result| {
json!({
"functionCall": {
"name": tool_call_result.call.name,
"args": tool_call_result.call.arguments,
}
})
}).collect();
let function_response_parts: Vec<Value> = tool_call_results.into_iter().map(|tool_call_result| {
json!({
"functionResponse": {
"name": tool_call_result.call.name,
"response": {
"name": tool_call_result.call.name,
"content": tool_call_result.output,
}
}
})
}).collect();
vec![
json!({ "role": "model", "parts": function_call_parts }),
json!({ "role": "function", "parts": function_response_parts }),
]
}
}
})
.collect();
if !network_image_urls.is_empty() {
bail!(
"The model does not support network images: {:?}",
network_image_urls
);
}
let mut body = json!({ "contents": contents, "generationConfig": {} });
if let Some(v) = model.max_tokens_param() {
body["generationConfig"]["maxOutputTokens"] = v.into();
}
if let Some(v) = temperature {
body["generationConfig"]["temperature"] = v.into();
}
if let Some(v) = top_p {
body["generationConfig"]["topP"] = v.into();
}
if let Some(functions) = functions {
body["tools"] = json!([{ "functionDeclarations": *functions }]);
}
Ok(body)
}
pub async fn prepare_gcloud_access_token(
client: &reqwest::Client,
client_name: &str,
adc_file: &Option<String>,
) -> Result<()> {
if !is_valid_access_token(client_name) {
let (token, expires_in) = fetch_access_token(client, adc_file)
.await
.with_context(|| "Failed to fetch access token")?;
let expires_at = Utc::now()
+ Duration::try_seconds(expires_in)
.ok_or_else(|| anyhow!("Failed to parse expires_in of access_token"))?;
set_access_token(client_name, token, expires_at.timestamp())
}
Ok(())
}
async fn fetch_access_token(
client: &reqwest::Client,
file: &Option<String>,
) -> Result<(String, i64)> {
let credentials = load_adc(file).await?;
let value: Value = client
.post("https://oauth2.googleapis.com/token")
.json(&credentials)
.send()
.await?
.json()
.await?;
if let (Some(access_token), Some(expires_in)) =
(value["access_token"].as_str(), value["expires_in"].as_i64())
{
Ok((access_token.to_string(), expires_in))
} else if let Some(err_msg) = value["error_description"].as_str() {
bail!("{err_msg}")
} else {
bail!("Invalid response data: {value}")
}
}
async fn load_adc(file: &Option<String>) -> Result<Value> {
let adc_file = file
.as_ref()
.map(PathBuf::from)
.or_else(default_adc_file)
.ok_or_else(|| anyhow!("No application_default_credentials.json"))?;
let data = tokio::fs::read_to_string(adc_file).await?;
let data: Value = serde_json::from_str(&data)?;
if let (Some(client_id), Some(client_secret), Some(refresh_token)) = (
data["client_id"].as_str(),
data["client_secret"].as_str(),
data["refresh_token"].as_str(),
) {
Ok(json!({
"client_id": client_id,
"client_secret": client_secret,
"refresh_token": refresh_token,
"grant_type": "refresh_token",
}))
} else {
bail!("Invalid application_default_credentials.json")
}
}
#[cfg(not(windows))]
fn default_adc_file() -> Option<PathBuf> {
let mut path = dirs::home_dir()?;
path.push(".config");
path.push("gcloud");
path.push("application_default_credentials.json");
Some(path)
}
#[cfg(windows)]
fn default_adc_file() -> Option<PathBuf> {
let mut path = dirs::config_dir()?;
path.push("gcloud");
path.push("application_default_credentials.json");
Some(path)
}