Add canary promoting

src/adapters/ingresses/apig.rs

@@ -4,6 +4,7 @@ use crate::utils::load_default_aws_config;
 
 use super::Ingress;
 use async_trait::async_trait;
+use aws_sdk_apigateway::types::{Op, PatchOperation};
 use miette::miette;
 use miette::{IntoDiagnostic, Result};
 use tokio::{fs::File, io::AsyncReadExt};
@@ -104,6 +105,36 @@ impl AwsApiGateway {
 
         Ok(())
     }
+
+    pub async fn promote_apig_canary(&self, api_id: &str, stage_name: &str) -> Result<()> {
+        // Overwrite the main deployment's ID with the canary's
+        let replace_deployment_op = PatchOperation::builder()
+            .op(Op::Copy)
+            .from("/canarySettings/deploymentId")
+            .path("/deploymentId")
+            .build();
+
+        // Reset canary traffic to 0% so we're ready for another release
+        let reset_traffic_op = PatchOperation::builder()
+            .op(Op::Replace)
+            .path("/canarySettings/percentTraffic")
+            // Note: this must be a string to pass into Value, but it's actually an f64 in AWS
+            .value("0.0")
+            .build();
+
+        // Send request to update stage
+        self.apig_client
+            .update_stage()
+            .rest_api_id(api_id)
+            .stage_name(stage_name)
+            .patch_operations(replace_deployment_op)
+            .patch_operations(reset_traffic_op)
+            .send()
+            .await
+            .into_diagnostic()?;
+
+        Ok(())
+    }
 }
 
 /// given a path to a file, load it as an array of bytes.
@@ -128,4 +159,10 @@ impl Ingress for AwsApiGateway {
 
         Ok(())
     }
+
+    async fn promote_canary(&mut self) -> Result<()> {
+        self.promote_apig_canary("Releases", "prod").await?;
+
+        Ok(())
+    }
 }

src/adapters/ingresses/mod.rs

@@ -11,7 +11,7 @@ pub trait Ingress {
 
     // TODO: define the other methods on this type.
     // async fn yank_canary(&mut self) -> Result<()>;
-    // async fn promote_canary(&mut self) -> Result<()>;
+    async fn promote_canary(&mut self) -> Result<()>;
     // async fn set_canary_traffic(&mut self, percent: u8);
 }
 
@@ -22,6 +22,10 @@ impl Ingress for MockIngress {
     async fn deploy(&mut self) -> Result<()> {
         todo!()
     }
+
+    async fn promote_canary(&mut self) -> Result<()> {
+        todo!()
+    }
 }
 
 impl From<MockIngress> for BoxIngress {