Add example back

Signed-off-by: David Calavera <[email protected]>

Author: calavera

examples/extension-logs-kinesis-firehose/Cargo.toml

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+[package]
+name = "lambda-logs-firehose-extension"
+version = "0.1.0"
+edition = "2021"
+
+# Use cargo-edit(https://github.com/killercup/cargo-edit#installation)
+# to manage dependencies.
+# Running `cargo add DEPENDENCY_NAME` will
+# add the latest version of a dependency to the list,
+# and it will keep the alphabetic ordering for you.
+
+[dependencies]
+lambda-extension = { path = "../../lambda-extension" }
+tokio = { version = "1.17.0", features = ["full"] }
+aws-config = "0.13.0"
+aws-sdk-firehose = "0.13.0"
+

examples/extension-logs-kinesis-firehose/README.md

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+# AWS Lambda Logs extension example
+
+## Build & Deploy
+
+1. Install [cargo-lambda](https://github.com/cargo-lambda/cargo-lambda#installation)
+2. Build the extension with `cargo lambda build --release --extension`
+3. Deploy the extension as a layer with `cargo lambda deploy --extension`
+
+The last command will give you an ARN for the extension layer that you can use in your functions.
+
+
+## Build for ARM 64
+
+Build the extension with `cargo lambda build --release --extension --arm64`

examples/extension-logs-kinesis-firehose/src/main.rs

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+use aws_sdk_firehose::{model::Record, types::Blob, Client};
+use lambda_extension::{Error, Extension, LambdaLog, LambdaLogRecord, Service, SharedService};
+use std::{future::Future, pin::Pin, task::Poll};
+
+#[derive(Clone)]
+struct FirehoseLogsProcessor {
+    client: Client,
+}
+
+impl FirehoseLogsProcessor {
+    pub fn new(client: Client) -> Self {
+        FirehoseLogsProcessor { client }
+    }
+}
+
+/// Implementation of the actual log processor
+///
+/// This receives a `Vec<LambdaLog>` whenever there are new log entries available.
+impl Service<Vec<LambdaLog>> for FirehoseLogsProcessor {
+    type Response = ();
+    type Error = Error;
+    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
+
+    fn poll_ready(&mut self, _cx: &mut core::task::Context<'_>) -> core::task::Poll<Result<(), Self::Error>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, logs: Vec<LambdaLog>) -> Self::Future {
+        let mut records = Vec::with_capacity(logs.len());
+
+        for log in logs {
+            match log.record {
+                LambdaLogRecord::Function(record) => {
+                    records.push(Record::builder().data(Blob::new(record.as_bytes())).build())
+                }
+                _ => unreachable!(),
+            }
+        }
+
+        let fut = self
+            .client
+            .put_record_batch()
+            .set_records(Some(records))
+            .delivery_stream_name(std::env::var("KINESIS_DELIVERY_STREAM").unwrap())
+            .send();
+
+        Box::pin(async move {
+            let _ = fut.await?;
+            Ok(())
+        })
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    let config = aws_config::load_from_env().await;
+    let logs_processor = SharedService::new(FirehoseLogsProcessor::new(Client::new(&config)));
+
+    Extension::new()
+        .with_log_types(&["function"])
+        .with_logs_processor(logs_processor)
+        .run()
+        .await?;
+
+    Ok(())
+}