640 lines
21 KiB
Rust
640 lines
21 KiB
Rust
use super::*;
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use crate::utils::{base64_decode, encode_uri, hex_encode, hmac_sha256, sha256, strip_think_tag};
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use anyhow::{Context, Result, bail};
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use aws_smithy_eventstream::frame::{DecodedFrame, MessageFrameDecoder};
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use aws_smithy_eventstream::smithy::parse_response_headers;
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use bytes::BytesMut;
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use chrono::{DateTime, Utc};
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use futures_util::StreamExt;
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use indexmap::IndexMap;
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use reqwest::{Client as ReqwestClient, Method, RequestBuilder};
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use serde::Deserialize;
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use serde_json::{Value, json};
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#[derive(Debug, Clone, Deserialize)]
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pub struct BedrockConfig {
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pub name: Option<String>,
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pub access_key_id: Option<String>,
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pub secret_access_key: Option<String>,
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pub region: Option<String>,
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pub session_token: Option<String>,
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#[serde(default)]
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pub models: Vec<ModelData>,
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pub patch: Option<RequestPatch>,
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pub extra: Option<ExtraConfig>,
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}
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impl BedrockClient {
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config_get_fn!(access_key_id, get_access_key_id);
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config_get_fn!(secret_access_key, get_secret_access_key);
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config_get_fn!(region, get_region);
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config_get_fn!(session_token, get_session_token);
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create_client_config!([
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("access_key_id", "AWS Access Key ID", None, true),
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("secret_access_key", "AWS Secret Access Key", None, true),
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("region", "AWS Region", None, false),
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]);
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fn chat_completions_builder(
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&self,
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client: &ReqwestClient,
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data: ChatCompletionsData,
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) -> Result<RequestBuilder> {
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let access_key_id = self.get_access_key_id()?;
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let secret_access_key = self.get_secret_access_key()?;
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let region = self.get_region()?;
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let session_token = self.get_session_token().ok();
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let host = format!("bedrock-runtime.{region}.amazonaws.com");
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let model_name = &self.model.real_name();
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let uri = if data.stream {
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format!("/model/{model_name}/converse-stream")
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} else {
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format!("/model/{model_name}/converse")
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};
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let body = build_chat_completions_body(data, &self.model)?;
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let mut request_data = RequestData::new("", body);
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self.patch_request_data(&mut request_data);
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let RequestData {
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url: _,
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headers,
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body,
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} = request_data;
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let builder = aws_fetch(
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client,
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&AwsCredentials {
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access_key_id,
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secret_access_key,
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region,
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session_token,
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},
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AwsRequest {
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method: Method::POST,
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host,
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service: "bedrock".into(),
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uri,
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querystring: "".into(),
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headers,
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body: body.to_string(),
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},
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)?;
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Ok(builder)
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}
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fn embeddings_builder(
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&self,
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client: &ReqwestClient,
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data: &EmbeddingsData,
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) -> Result<RequestBuilder> {
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let access_key_id = self.get_access_key_id()?;
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let secret_access_key = self.get_secret_access_key()?;
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let region = self.get_region()?;
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let session_token = self.get_session_token().ok();
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let host = format!("bedrock-runtime.{region}.amazonaws.com");
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let uri = format!("/model/{}/invoke", self.model.real_name());
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let input_type = match data.query {
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true => "search_query",
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false => "search_document",
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};
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let body = json!({
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"texts": data.texts,
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"input_type": input_type,
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});
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let mut request_data = RequestData::new("", body);
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self.patch_request_data(&mut request_data);
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let RequestData {
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url: _,
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headers,
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body,
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} = request_data;
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let builder = aws_fetch(
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client,
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&AwsCredentials {
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access_key_id,
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secret_access_key,
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region,
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session_token,
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},
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AwsRequest {
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method: Method::POST,
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host,
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service: "bedrock".into(),
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uri,
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querystring: "".into(),
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headers,
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body: body.to_string(),
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},
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)?;
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Ok(builder)
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}
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}
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#[async_trait::async_trait]
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impl Client for BedrockClient {
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client_common_fns!();
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async fn chat_completions_inner(
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&self,
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client: &ReqwestClient,
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data: ChatCompletionsData,
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) -> Result<ChatCompletionsOutput> {
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let builder = self.chat_completions_builder(client, data)?;
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chat_completions(builder).await
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}
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async fn chat_completions_streaming_inner(
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&self,
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client: &ReqwestClient,
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handler: &mut SseHandler,
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data: ChatCompletionsData,
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) -> Result<()> {
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let builder = self.chat_completions_builder(client, data)?;
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chat_completions_streaming(builder, handler).await
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}
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async fn embeddings_inner(
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&self,
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client: &ReqwestClient,
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data: &EmbeddingsData,
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) -> Result<EmbeddingsOutput> {
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let builder = self.embeddings_builder(client, data)?;
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embeddings(builder).await
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}
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}
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async fn chat_completions(builder: RequestBuilder) -> Result<ChatCompletionsOutput> {
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let res = builder.send().await?;
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let status = res.status();
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let data: Value = res.json().await?;
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if !status.is_success() {
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catch_error(&data, status.as_u16())?;
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}
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debug!("non-stream-data: {data}");
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extract_chat_completions(&data)
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}
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async fn chat_completions_streaming(
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builder: RequestBuilder,
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handler: &mut SseHandler,
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) -> Result<()> {
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let res = builder.send().await?;
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let status = res.status();
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if !status.is_success() {
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let data: Value = res.json().await?;
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catch_error(&data, status.as_u16())?;
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bail!("Invalid response data: {data}");
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}
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let mut function_name = String::new();
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let mut function_arguments = String::new();
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let mut function_id = String::new();
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let mut reasoning_state = 0;
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let mut stream = res.bytes_stream();
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let mut buffer = BytesMut::new();
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let mut decoder = MessageFrameDecoder::new();
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while let Some(chunk) = stream.next().await {
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let chunk = chunk?;
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buffer.extend_from_slice(&chunk);
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while let DecodedFrame::Complete(message) = decoder.decode_frame(&mut buffer)? {
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let response_headers = parse_response_headers(&message)?;
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let message_type = response_headers.message_type.as_str();
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let smithy_type = response_headers.smithy_type.as_str();
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match (message_type, smithy_type) {
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("event", _) => {
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let data: Value = serde_json::from_slice(message.payload())?;
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debug!("stream-data: {smithy_type} {data}");
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match smithy_type {
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"contentBlockStart" => {
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if let Some(tool_use) = data["start"]["toolUse"].as_object()
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&& let (Some(id), Some(name)) = (
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json_str_from_map(tool_use, "toolUseId"),
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json_str_from_map(tool_use, "name"),
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)
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{
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if !function_name.is_empty() {
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if function_arguments.is_empty() {
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function_arguments = String::from("{}");
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}
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let arguments: Value =
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function_arguments.parse().with_context(|| {
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format!("Tool call '{function_name}' has non-JSON arguments '{function_arguments}'")
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})?;
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handler.tool_call(ToolCall::new(
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function_name.clone(),
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arguments,
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Some(function_id.clone()),
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))?;
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}
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function_arguments.clear();
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function_name = name.into();
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function_id = id.into();
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}
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}
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"contentBlockDelta" => {
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if let Some(text) = data["delta"]["text"].as_str() {
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handler.text(text)?;
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} else if let Some(text) =
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data["delta"]["reasoningContent"]["text"].as_str()
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{
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if reasoning_state == 0 {
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handler.text("<think>\n")?;
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reasoning_state = 1;
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}
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handler.text(text)?;
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} else if let Some(input) = data["delta"]["toolUse"]["input"].as_str() {
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function_arguments.push_str(input);
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}
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}
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"contentBlockStop" => {
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if reasoning_state == 1 {
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handler.text("\n</think>\n\n")?;
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reasoning_state = 0;
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}
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if !function_name.is_empty() {
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if function_arguments.is_empty() {
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function_arguments = String::from("{}");
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}
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let arguments: Value = function_arguments.parse().with_context(|| {
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format!("Tool call '{function_name}' has non-JSON arguments '{function_arguments}'")
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})?;
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handler.tool_call(ToolCall::new(
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function_name.clone(),
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arguments,
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Some(function_id.clone()),
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))?;
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}
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}
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_ => {}
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}
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}
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("exception", _) => {
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let payload = base64_decode(message.payload())?;
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let data = String::from_utf8_lossy(&payload);
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bail!("Invalid response data: {data} (smithy_type: {smithy_type})")
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}
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_ => {
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bail!(
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"Unrecognized message, message_type: {message_type}, smithy_type: {smithy_type}",
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);
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}
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}
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}
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}
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Ok(())
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}
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async fn embeddings(builder: RequestBuilder) -> Result<EmbeddingsOutput> {
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let res = builder.send().await?;
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let status = res.status();
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let data: Value = res.json().await?;
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if !status.is_success() {
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catch_error(&data, status.as_u16())?;
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}
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let res_body: EmbeddingsResBody =
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serde_json::from_value(data).context("Invalid embeddings data")?;
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Ok(res_body.embeddings)
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}
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#[derive(Deserialize)]
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struct EmbeddingsResBody {
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embeddings: Vec<Vec<f32>>,
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}
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fn build_chat_completions_body(data: ChatCompletionsData, model: &Model) -> Result<Value> {
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let ChatCompletionsData {
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mut messages,
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temperature,
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top_p,
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functions,
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stream: _,
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} = data;
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let system_message = extract_system_message(&mut messages);
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let mut network_image_urls = vec![];
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let messages_len = messages.len();
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let messages: Vec<Value> = messages
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.into_iter()
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.enumerate()
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.flat_map(|(i, message)| {
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let Message { role, content } = message;
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match content {
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MessageContent::Text(text) if role.is_assistant() && i != messages_len - 1 => {
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vec![json!({ "role": role, "content": [ { "text": strip_think_tag(&text) } ] })]
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}
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MessageContent::Text(text) => vec![json!({
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"role": role,
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"content": [
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{
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"text": text,
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}
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],
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})],
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MessageContent::Array(list) => {
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let content: Vec<_> = list
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.into_iter()
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.map(|item| match item {
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MessageContentPart::Text { text } => {
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json!({"text": text})
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}
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MessageContentPart::ImageUrl {
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image_url: ImageUrl { url },
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} => {
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if let Some((mime_type, data)) = url
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.strip_prefix("data:")
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.and_then(|v| v.split_once(";base64,"))
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{
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json!({
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"image": {
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"format": mime_type.replace("image/", ""),
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"source": {
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"bytes": data,
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}
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}
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})
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} else {
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network_image_urls.push(url.clone());
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json!({ "url": url })
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}
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}
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})
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.collect();
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vec![json!({
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"role": role,
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"content": content,
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})]
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}
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MessageContent::ToolCalls(MessageContentToolCalls {
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tool_results, text, ..
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}) => {
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let mut assistant_parts = vec![];
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let mut user_parts = vec![];
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if !text.is_empty() {
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assistant_parts.push(json!({
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"text": text,
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}))
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}
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for tool_result in tool_results {
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assistant_parts.push(json!({
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"toolUse": {
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"toolUseId": tool_result.call.id,
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"name": tool_result.call.name,
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"input": tool_result.call.arguments,
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}
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}));
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user_parts.push(json!({
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"toolResult": {
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"toolUseId": tool_result.call.id,
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"content": [
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{
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"json": tool_result.output,
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}
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]
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}
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}));
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}
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vec![
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json!({
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"role": "assistant",
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"content": assistant_parts,
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}),
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json!({
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"role": "user",
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"content": user_parts,
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}),
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]
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}
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}
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})
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.collect();
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if !network_image_urls.is_empty() {
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bail!(
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"The model does not support network images: {:?}",
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network_image_urls
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);
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}
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let mut body = json!({
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"inferenceConfig": {},
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"messages": messages,
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});
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if let Some(v) = system_message {
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body["system"] = json!([
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{
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"text": v,
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}
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])
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}
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if let Some(v) = model.max_tokens_param() {
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body["inferenceConfig"]["maxTokens"] = v.into();
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}
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if let Some(v) = temperature {
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body["inferenceConfig"]["temperature"] = v.into();
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}
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if let Some(v) = top_p {
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body["inferenceConfig"]["topP"] = v.into();
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}
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if let Some(functions) = functions {
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let tools: Vec<_> = functions
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.iter()
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.map(|v| {
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json!({
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"toolSpec": {
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"name": v.name,
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"description": v.description,
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"inputSchema": {
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"json": v.parameters,
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},
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}
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})
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})
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.collect();
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body["toolConfig"] = json!({
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"tools": tools,
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})
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}
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Ok(body)
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}
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fn extract_chat_completions(data: &Value) -> Result<ChatCompletionsOutput> {
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let mut text = String::new();
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let mut reasoning = None;
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let mut tool_calls = vec![];
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if let Some(array) = data["output"]["message"]["content"].as_array() {
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for item in array {
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if let Some(v) = item["text"].as_str() {
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if !text.is_empty() {
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text.push_str("\n\n");
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}
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text.push_str(v);
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} else if let Some(reasoning_text) =
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item["reasoningContent"]["reasoningText"].as_object()
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{
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if let Some(text) = json_str_from_map(reasoning_text, "text") {
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reasoning = Some(text.to_string());
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}
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} else if let Some(tool_use) = item["toolUse"].as_object()
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&& let (Some(id), Some(name), Some(input)) = (
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json_str_from_map(tool_use, "toolUseId"),
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json_str_from_map(tool_use, "name"),
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tool_use.get("input"),
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)
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{
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tool_calls.push(ToolCall::new(
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name.to_string(),
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input.clone(),
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Some(id.to_string()),
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))
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}
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}
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}
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if let Some(reasoning) = reasoning {
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text = format!("<think>\n{reasoning}\n</think>\n\n{text}")
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}
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if text.is_empty() && tool_calls.is_empty() {
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bail!("Invalid response data: {data}");
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}
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let output = ChatCompletionsOutput { text, tool_calls };
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Ok(output)
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}
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|
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#[derive(Debug)]
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struct AwsCredentials {
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access_key_id: String,
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secret_access_key: String,
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region: String,
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session_token: Option<String>,
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}
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|
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#[derive(Debug)]
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|
struct AwsRequest {
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method: Method,
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host: String,
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service: String,
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uri: String,
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querystring: String,
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headers: IndexMap<String, String>,
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body: String,
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}
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|
|
fn aws_fetch(
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client: &ReqwestClient,
|
|
credentials: &AwsCredentials,
|
|
request: AwsRequest,
|
|
) -> Result<RequestBuilder> {
|
|
let AwsRequest {
|
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method,
|
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host,
|
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service,
|
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uri,
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querystring,
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mut headers,
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|
body,
|
|
} = request;
|
|
let region = &credentials.region;
|
|
|
|
let endpoint = format!("https://{host}{uri}");
|
|
|
|
let now: DateTime<Utc> = Utc::now();
|
|
let amz_date = now.format("%Y%m%dT%H%M%SZ").to_string();
|
|
let date_stamp = amz_date[0..8].to_string();
|
|
headers.insert("host".into(), host.clone());
|
|
headers.insert("x-amz-date".into(), amz_date.clone());
|
|
if let Some(token) = credentials.session_token.clone() {
|
|
headers.insert("x-amz-security-token".into(), token);
|
|
}
|
|
|
|
let canonical_headers = headers
|
|
.iter()
|
|
.map(|(key, value)| format!("{key}:{value}\n"))
|
|
.collect::<Vec<_>>()
|
|
.join("");
|
|
|
|
let signed_headers = headers
|
|
.iter()
|
|
.map(|(key, _)| key.as_str())
|
|
.collect::<Vec<_>>()
|
|
.join(";");
|
|
|
|
let payload_hash = sha256(&body);
|
|
|
|
let canonical_request = format!(
|
|
"{}\n{}\n{}\n{}\n{}\n{}",
|
|
method,
|
|
encode_uri(&uri),
|
|
querystring,
|
|
canonical_headers,
|
|
signed_headers,
|
|
payload_hash
|
|
);
|
|
|
|
let algorithm = "AWS4-HMAC-SHA256";
|
|
let credential_scope = format!("{date_stamp}/{region}/{service}/aws4_request");
|
|
let string_to_sign = format!(
|
|
"{}\n{}\n{}\n{}",
|
|
algorithm,
|
|
amz_date,
|
|
credential_scope,
|
|
sha256(&canonical_request)
|
|
);
|
|
|
|
let signing_key = gen_signing_key(
|
|
&credentials.secret_access_key,
|
|
&date_stamp,
|
|
region,
|
|
&service,
|
|
);
|
|
let signature = hmac_sha256(&signing_key, &string_to_sign);
|
|
let signature = hex_encode(&signature);
|
|
|
|
let authorization_header = format!(
|
|
"{} Credential={}/{}, SignedHeaders={}, Signature={}",
|
|
algorithm, credentials.access_key_id, credential_scope, signed_headers, signature
|
|
);
|
|
|
|
headers.insert("authorization".into(), authorization_header);
|
|
|
|
debug!("Request {endpoint} {body}");
|
|
|
|
let mut request_builder = client.request(method, endpoint).body(body);
|
|
|
|
for (key, value) in &headers {
|
|
request_builder = request_builder.header(key, value);
|
|
}
|
|
|
|
Ok(request_builder)
|
|
}
|
|
|
|
fn gen_signing_key(key: &str, date_stamp: &str, region: &str, service: &str) -> Vec<u8> {
|
|
let k_date = hmac_sha256(format!("AWS4{key}").as_bytes(), date_stamp);
|
|
let k_region = hmac_sha256(&k_date, region);
|
|
let k_service = hmac_sha256(&k_region, service);
|
|
hmac_sha256(&k_service, "aws4_request")
|
|
}
|