Cloudwatch alarms (#760)

* Add CloudWatch Alarm events

CloudWatch has added the ability to trigger Lambda functions base on alarms.

See annoucement here: https://aws.amazon.com/about-aws/whats-new/2023/12/amazon-cloudwatch-alarms-lambda-change-action/

Signed-off-by: David Calavera <david.calavera@gmail.com>

* Remove unnecessary import from tests.

Signed-off-by: David Calavera <david.calavera@gmail.com>

* Update events section in the readme.

Signed-off-by: David Calavera <david.calavera@gmail.com>

* Remove empty lines.

Signed-off-by: David Calavera <david.calavera@gmail.com>

* Implement custom serde interfaces with known reason data.

Signed-off-by: David Calavera <david.calavera@gmail.com>

* Add more docs

Signed-off-by: David Calavera <david.calavera@gmail.com>

---------

Signed-off-by: David Calavera <david.calavera@gmail.com>

Author: calavera

Makefile

@@ -72,6 +72,7 @@ check-event-features:
 	cargo test --package aws_lambda_events --no-default-features --features bedrock_agent_runtime
 	cargo test --package aws_lambda_events --no-default-features --features chime_bot
 	cargo test --package aws_lambda_events --no-default-features --features clientvpn
+	cargo test --package aws_lambda_events --no-default-features --features cloudwatch_alarms
 	cargo test --package aws_lambda_events --no-default-features --features cloudwatch_events
 	cargo test --package aws_lambda_events --no-default-features --features cloudwatch_logs
 	cargo test --package aws_lambda_events --no-default-features --features code_commit

README.md

@@ -374,7 +374,7 @@ Lambdas can be run and debugged locally using a special [Lambda debug proxy](htt
 
 ## AWS event objects
 
-This project does not currently include Lambda event struct definitions. Instead, the community-maintained [`aws_lambda_events`](https://crates.io/crates/aws_lambda_events) crate can be leveraged to provide strongly-typed Lambda event structs. You can create your own custom event objects and their corresponding structs as well.
+This project includes Lambda event struct definitions, [`aws_lambda_events`](https://crates.io/crates/aws_lambda_events). This crate can be leveraged to provide strongly-typed Lambda event structs. You can create your own custom event objects and their corresponding structs as well.
 
 ### Custom event objects
 

lambda-events/Cargo.toml

@@ -47,6 +47,7 @@ default = [
   "chime_bot",
   "clientvpn",
   "cloudformation",
+  "cloudwatch_alarms",
   "cloudwatch_events",
   "cloudwatch_logs",
   "code_commit",
@@ -90,6 +91,7 @@ bedrock_agent_runtime = []
 chime_bot = ["chrono"]
 clientvpn = []
 cloudformation = []
+cloudwatch_alarms = ["chrono"]
 cloudwatch_events = ["chrono"]
 cloudwatch_logs = ["flate2"]
 code_commit = ["chrono"]

lambda-events/src/custom_serde/mod.rs

@@ -96,7 +96,6 @@ where
 mod test {
     use super::*;
     use serde::{Deserialize, Serialize};
-    use serde_json;
 
     #[test]
     fn test_deserialize_base64() {

lambda-events/src/encodings/http.rs

@@ -246,7 +246,6 @@ impl HttpBody for Body {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use serde_json;
     use std::collections::HashMap;
 
     #[test]

lambda-events/src/encodings/time.rs

@@ -215,7 +215,6 @@ where
 mod test {
     use super::*;
     use chrono::TimeZone;
-    use serde_json;
 
     #[test]
     fn test_deserialize_milliseconds() {

lambda-events/src/event/activemq/mod.rs

@@ -54,8 +54,6 @@ pub struct ActiveMqDestination {
 mod test {
     use super::*;
 
-    use serde_json;
-
     #[test]
     #[cfg(feature = "activemq")]
     fn example_activemq_event() {

lambda-events/src/event/alb/mod.rs

@@ -69,8 +69,6 @@ pub struct AlbTargetGroupResponse {
 mod test {
     use super::*;
 
-    use serde_json;
-
     #[test]
     #[cfg(feature = "alb")]
     fn example_alb_lambda_target_request_headers_only() {

lambda-events/src/event/apigw/mod.rs

@@ -769,8 +769,6 @@ fn default_http_method() -> Method {
 mod test {
     use super::*;
 
-    use serde_json;
-
     #[test]
     #[cfg(feature = "apigw")]
     fn example_apigw_custom_auth_request_type_request() {

lambda-events/src/event/appsync/mod.rs

@@ -122,8 +122,6 @@ where
 mod test {
     use super::*;
 
-    use serde_json;
-
     #[test]
     #[cfg(feature = "appsync")]
     fn example_appsync_identity_cognito() {