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| 1 | +// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 2 | +// SPDX-License-Identifier: Apache-2.0 |
| 3 | + |
| 4 | +use aws_config::{BehaviorVersion, SdkConfig}; |
| 5 | +use aws_sdk_bedrockagentruntime::{ |
| 6 | + self as bedrockagentruntime, |
| 7 | + types::{error::ResponseStreamError, ResponseStream}, |
| 8 | +}; |
| 9 | +#[allow(unused_imports)] |
| 10 | +use mockall::automock; |
| 11 | + |
| 12 | +const BEDROCK_AGENT_ID: &str = "AJBHXXILZN"; |
| 13 | +const BEDROCK_AGENT_ALIAS_ID: &str = "AVKP1ITZAA"; |
| 14 | +const BEDROCK_AGENT_REGION: &str = "us-east-1"; |
| 15 | + |
| 16 | +#[cfg(not(test))] |
| 17 | +pub use EventReceiverImpl as EventReceiver; |
| 18 | +#[cfg(test)] |
| 19 | +pub use MockEventReceiverImpl as EventReceiver; |
| 20 | + |
| 21 | +pub struct EventReceiverImpl { |
| 22 | + inner: aws_sdk_bedrockagentruntime::primitives::event_stream::EventReceiver< |
| 23 | + ResponseStream, |
| 24 | + ResponseStreamError, |
| 25 | + >, |
| 26 | +} |
| 27 | + |
| 28 | +#[cfg_attr(test, automock)] |
| 29 | +impl EventReceiverImpl { |
| 30 | + #[allow(dead_code)] |
| 31 | + pub fn new( |
| 32 | + inner: aws_sdk_bedrockagentruntime::primitives::event_stream::EventReceiver< |
| 33 | + ResponseStream, |
| 34 | + ResponseStreamError, |
| 35 | + >, |
| 36 | + ) -> Self { |
| 37 | + Self { inner } |
| 38 | + } |
| 39 | + |
| 40 | + pub async fn recv( |
| 41 | + &mut self, |
| 42 | + ) -> Result< |
| 43 | + Option<ResponseStream>, |
| 44 | + aws_sdk_bedrockagentruntime::error::SdkError< |
| 45 | + ResponseStreamError, |
| 46 | + aws_smithy_types::event_stream::RawMessage, |
| 47 | + >, |
| 48 | + > { |
| 49 | + self.inner.recv().await |
| 50 | + } |
| 51 | +} |
| 52 | + |
| 53 | +#[tokio::main] |
| 54 | +async fn main() -> Result<(), Box<bedrockagentruntime::Error>> { |
| 55 | + let result = invoke_bedrock_agent("I need help.".to_string(), "123".to_string()).await?; |
| 56 | + println!("{}", result); |
| 57 | + Ok(()) |
| 58 | +} |
| 59 | + |
| 60 | +async fn invoke_bedrock_agent( |
| 61 | + prompt: String, |
| 62 | + session_id: String, |
| 63 | +) -> Result<String, bedrockagentruntime::Error> { |
| 64 | + let sdk_config: SdkConfig = aws_config::defaults(BehaviorVersion::latest()) |
| 65 | + .region(BEDROCK_AGENT_REGION) |
| 66 | + .load() |
| 67 | + .await; |
| 68 | + let bedrock_client = bedrockagentruntime::Client::new(&sdk_config); |
| 69 | + |
| 70 | + let command_builder = bedrock_client |
| 71 | + .invoke_agent() |
| 72 | + .agent_id(BEDROCK_AGENT_ID) |
| 73 | + .agent_alias_id(BEDROCK_AGENT_ALIAS_ID) |
| 74 | + .session_id(session_id) |
| 75 | + .input_text(prompt); |
| 76 | + |
| 77 | + let response = command_builder.send().await?; |
| 78 | + |
| 79 | + let response_stream = response.completion; |
| 80 | + |
| 81 | + let event_receiver = EventReceiver::new(response_stream); |
| 82 | + |
| 83 | + process_agent_response_stream(event_receiver).await |
| 84 | +} |
| 85 | + |
| 86 | +async fn process_agent_response_stream( |
| 87 | + mut event_receiver: EventReceiver, |
| 88 | +) -> Result<String, bedrockagentruntime::Error> { |
| 89 | + let mut full_agent_text_response = String::new(); |
| 90 | + |
| 91 | + while let Some(event_result) = event_receiver.recv().await? { |
| 92 | + match event_result { |
| 93 | + ResponseStream::Chunk(chunk) => { |
| 94 | + if let Some(bytes) = chunk.bytes { |
| 95 | + match String::from_utf8(bytes.into_inner()) { |
| 96 | + Ok(text_chunk) => { |
| 97 | + full_agent_text_response.push_str(&text_chunk); |
| 98 | + } |
| 99 | + Err(e) => { |
| 100 | + eprintln!("UTF-8 decoding error for chunk: {}", e); |
| 101 | + } |
| 102 | + } |
| 103 | + } |
| 104 | + } |
| 105 | + _ => { |
| 106 | + panic!("received an unhandled event type from Bedrock stream",); |
| 107 | + } |
| 108 | + } |
| 109 | + } |
| 110 | + Ok(full_agent_text_response) |
| 111 | +} |
| 112 | + |
| 113 | +#[cfg(test)] |
| 114 | +mod test { |
| 115 | + |
| 116 | + use super::*; |
| 117 | + |
| 118 | + #[tokio::test] |
| 119 | + async fn test_process_agent_response_stream() { |
| 120 | + let mut mock = MockEventReceiverImpl::default(); |
| 121 | + mock.expect_recv().times(1).returning(|| { |
| 122 | + Ok(Some( |
| 123 | + aws_sdk_bedrockagentruntime::types::ResponseStream::Chunk( |
| 124 | + aws_sdk_bedrockagentruntime::types::PayloadPart::builder() |
| 125 | + .set_bytes(Some(aws_smithy_types::Blob::new(vec![ |
| 126 | + 116, 101, 115, 116, 32, 99, 111, 109, 112, 108, 101, 116, 105, 111, 110, |
| 127 | + ]))) |
| 128 | + .build(), |
| 129 | + ), |
| 130 | + )) |
| 131 | + }); |
| 132 | + |
| 133 | + // end the stream |
| 134 | + mock.expect_recv().times(1).returning(|| Ok(None)); |
| 135 | + |
| 136 | + let response = process_agent_response_stream(mock).await.unwrap(); |
| 137 | + |
| 138 | + assert_eq!("test completion", response); |
| 139 | + } |
| 140 | + |
| 141 | + #[tokio::test] |
| 142 | + #[should_panic(expected = "received an unhandled event type from Bedrock stream")] |
| 143 | + async fn test_process_agent_response_stream_error() { |
| 144 | + let mut mock = MockEventReceiverImpl::default(); |
| 145 | + mock.expect_recv().times(1).returning(|| { |
| 146 | + Ok(Some( |
| 147 | + aws_sdk_bedrockagentruntime::types::ResponseStream::Trace( |
| 148 | + aws_sdk_bedrockagentruntime::types::TracePart::builder().build(), |
| 149 | + ), |
| 150 | + )) |
| 151 | + }); |
| 152 | + |
| 153 | + let _ = process_agent_response_stream(mock).await.unwrap(); |
| 154 | + } |
| 155 | +} |
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