Merge pull request #140 from ruby-no-kai/lambda2

lambda: follow up changes

Author: sorah

README.md

@@ -8,19 +8,26 @@ Detailed docs for RubyKaigi orgz: https://rubykaigi.esa.io/posts/1241
 
 Deployments are automatically performed on GitHub Actions on `master` branch after CI.
 
-- App Runner: [arn:aws:apprunner:us-west-2:005216166247:service/rko-router/2c9219ae5e14411baaf46fa932f33025](https://us-west-2.console.aws.amazon.com/apprunner/home?region=us-west-2#/services/dashboard?service_arn=arn%3Aaws%3Aapprunner%3Aus-west-2%3A005216166247%3Aservice%2Frko-router%2F2c9219ae5e14411baaf46fa932f33025&active_tab=logs)
+- Lambda: [rko-router](https://us-west-2.console.aws.amazon.com/lambda/home?region=us-west-2#/functions/rko-router?tab=monitoring)
+- App Runner (deprecated): [arn:aws:apprunner:us-west-2:005216166247:service/rko-router/2c9219ae5e14411baaf46fa932f33025](https://us-west-2.console.aws.amazon.com/apprunner/home?region=us-west-2#/services/dashboard?service_arn=arn%3Aaws%3Aapprunner%3Aus-west-2%3A005216166247%3Aservice%2Frko-router%2F2c9219ae5e14411baaf46fa932f33025&active_tab=logs)
 - CloudFront: [arn:aws:cloudfront::005216166247:distribution/E2WEWQCYU12GVD](https://us-east-1.console.aws.amazon.com/cloudfront/v3/home?region=ap-northeast-1#/distributions/E2WEWQCYU12GVD)
 
-All resources except App Runner deployment is managed under Terraform (`./tf`).
+All resources except deployment is managed under Terraform [./tf](./tf).
 
 ### Domains
 
-Due to the quota of custom domains per App Runner service, the first hop on rko-router proxies a request to itself with correct `Host` header.
+Due to the quota of custom domains per App Runner service and the lambda function URL, the first hop on rko-router proxies a request to itself with correct `Host` header. We call this virtual host a _jump host._
 
 `x-rko-host` and `x-rko-xfp` headers are referenced as a `Host` and `X-Forwarded-Proto` header for the second hop.
 
 These custom headers are assigned at CloudFront function (viewer-request) and implementation is at [./tf/cf_functions/src/viewreq.ts](./tf/cf_functions/src/viewreq.ts).
 
+### Cache invalidation
+
+While rubykaigi.org deployment automatically invalidates CloudFront cache on each deployment, rko-router does not.
+
+You need to manually invalidate the cache: https://rubykaigi.esa.io/posts/1241#%E3%82%AD%E3%83%A3%E3%83%83%E3%82%B7%E3%83%A5
+
 ## Run locally
 
 ```

config/github_pages.conf

@@ -11,3 +11,4 @@ proxy_hide_header x-served-by;
 add_header via "1.1 rko-router.rubykaigi.org";
 add_header x-rk-ghp "fi=\"$upstream_http_x_fastly_request_id\",fs=\"$upstream_http_x_served_by\",ghi=\"$upstream_http_x_github_request_id\",cache=\"$upstream_http_x_cache\",cache-hits=\"$upstream_http_x_cache_hits\"";
 add_header server-timing "rko-router;dur=$upstream_response_time,$fastly_timer_as_server_timing";
+add_header x-server-timing "rko-router;dur=$upstream_response_time,$fastly_timer_as_server_timing";

config/nginx.conf.erb

@@ -192,9 +192,15 @@ http {
         set $x_rko_xfp "http";
       }
 
+      set $x_request_id "$http_x_request_id";
+      if ( $http_x_request_id = "" ) {
+        set $x_request_id "$http_x_amz_cf_id";
+      }
+
       proxy_set_header Host $http_x_rko_host;
       proxy_set_header X-Forwarded-Proto $x_rko_xfp;
       proxy_set_header x-rko-forwarded "yes";
+      proxy_set_header x-request-id "$x_request_id";
       proxy_pass http://localhost:<%= ENV.fetch("PORT") %>;
     }
   }

tf/cf_functions/src/viewreq.ts

@@ -12,7 +12,5 @@ function handler(
     request.headers["x-rko-xfp"] = { value: "http" };
   }
 
-  request.headers["x-request-id"] = { value: context.requestId };
-
   return request;
 }