Update nix derivation with examples

README.md

@@ -6,7 +6,7 @@ Create [AWS CloudFront Lambda@Edge](https://docs.aws.amazon.com/lambda/latest/dg
 
 This package uses an [Elm headless worker](https://package.elm-lang.org/packages/elm/core/latest/Platform#worker) under
 the hood requiring [ports](https://guide.elm-lang.org/interop/ports) and a small JavaScript snippet to be bundled and
-deployed into AWS CloudFront Lambda@Edge.
+deployed into AWS CloudFront Lambda@Edge. Check the [examples folder](/examples).
 
 Elm part:
 
@@ -75,9 +75,9 @@ makeLambda.buildElmAWSCloudFront {
   elmSrc = ./elm-srcs.nix;
   elmRegistryDat = ./registry.dat;
   lambdas = [
-    { module = "MyModuleTwo"; }
+    { module = ./src/MyModuleTwo.elm; }
     {
-      module = "MyModuleOne";
+      module = ./src/MyModuleOne.elm;
       flags = [ ''token:"token-goes-here"'' ''url:"url-goes-here"'' ];
     }
   ];

default.nix

@@ -3,8 +3,7 @@
     stdenv.mkDerivation {
       name = "elm-aws-cloudfront";
       src = src;
-      buildInputs =
-        [ pkgs.elmPackages.elm pkgs.esbuild ];
+      buildInputs = [ pkgs.elmPackages.elm pkgs.esbuild ];
 
       buildPhase = pkgs.elmPackages.fetchElmDeps {
         elmPackages = import elmSrc;
@@ -14,10 +13,11 @@
 
       installPhase = let
         buildFlags = flags: "{flags: {${lib.concatStringsSep ", " flags}}}";
+        moduleName = module: lib.removeSuffix ".elm" (baseNameOf module);
         jsHandler = lambda:
-          pkgs.writeText "${lambda.module}.js" ''
+          pkgs.writeText "${moduleName lambda.module}.js" ''
             const {Elm} = require('./elm.tmp');
-            const app = Elm.${lambda.module}.init(${
+            const app = Elm.${moduleName lambda.module}.init(${
               if lambda ? "flags" then buildFlags lambda.flags else ""
             });
             exports.handler = (event, context, callback) => {
@@ -32,14 +32,16 @@
       in "${lib.concatStrings (map (lambda: ''
         mkdir -p $out
 
-        echo "creating js handler for ${lambda.module}"
-        cp ${jsHandler lambda} $out/${lambda.module}.tmp.js
+        echo "creating js handler for ${baseNameOf lambda.module}"
+        cp ${jsHandler lambda} $out/${moduleName lambda.module}.tmp.js
 
-        echo "compiling ${lambda.module}.elm"
-        ${pkgs.elmPackages.elm}/bin/elm make src/${lambda.module}.elm --optimize --output $out/elm.tmp.js
+        echo "compiling ${baseNameOf lambda.module}"
+        ${pkgs.elmPackages.elm}/bin/elm make ${lambda.module} --optimize --output $out/elm.tmp.js
 
-        echo "bundle ${lambda.module}"
-        ${pkgs.esbuild}/bin/esbuild --bundle --minify --pure:A2 --pure:A3 --pure:A4 --pure:A5 --pure:A6 --pure:A7 --pure:A8 --pure:A9 --pure:F2 --pure:F3 --pure:F3 --pure:F4 --pure:F5 --pure:F6 --pure:F7 --pure:F8 --pure:F9 --platform=node --outfile=$out/${lambda.module}.js $out/${lambda.module}.tmp.js
+        echo "bundle ${moduleName lambda.module}"
+        ${pkgs.esbuild}/bin/esbuild --bundle --minify --pure:A2 --pure:A3 --pure:A4 --pure:A5 --pure:A6 --pure:A7 --pure:A8 --pure:A9 --pure:F2 --pure:F3 --pure:F3 --pure:F4 --pure:F5 --pure:F6 --pure:F7 --pure:F8 --pure:F9 --platform=node --outfile=$out/${
+          moduleName lambda.module
+        }.js $out/${moduleName lambda.module}.tmp.js
 
         echo "cleanup temporary files"
         rm $out/*.tmp.js

examples/MyModule.elm

@@ -0,0 +1,26 @@
+port module MyModule exposing (main)
+
+import CloudFront exposing (Model, Msg, cloudFront)
+import CloudFront.Header exposing (withHeader)
+import CloudFront.Lambda exposing (originResponse, toResponse)
+import Json.Decode as Decode
+import Json.Encode as Encode
+
+
+port inputEvent : (Decode.Value -> msg) -> Sub msg
+
+
+port outputEvent : Encode.Value -> Cmd msg
+
+
+main : Program () (Model ()) Msg
+main =
+    ( inputEvent, outputEvent )
+        |> (originResponse
+                (\{ response, request } _ ->
+                    response
+                        |> withHeader { key = "cache-control", value = "public, max-age=31536000" }
+                        |> toResponse
+                )
+                |> cloudFront
+           )

examples/default.nix

@@ -0,0 +1,27 @@
+let
+  cloudfront = pkgs.callPackage (pkgs.stdenv.mkDerivation {
+    name = "elm-aws-cloudfront";
+    src = fetchGit {
+      url = "https://github.com/MarcoDaniels/elm-aws-cloudfront.git";
+      ref = "refs/tags/nix-1.0.0";
+    };
+    installPhase = ''
+      mkdir -p $out
+      cp $src/default.nix $out
+    '';
+  }) { };
+
+in cloudfront.buildElmAWSCloudFront {
+  src = ../../.;
+  elmSrc = ../../nix/elm-srcs.nix;
+  elmRegistryDat = ../../nix/registry.dat;
+  lambdas = [
+    { module = ./src/WebsiteRequest.elm; }
+    { module = ./src/WebsiteResponse.elm; }
+    {
+      module = ./src/AssetRequest.elm;
+      flags = [ ''token:"token"'' ''domain:"domain"'' ];
+    }
+    { module = ./src/AssetResponse.elm; }
+  ];
+}

examples/myModule.js

@@ -0,0 +1,10 @@
+const {Elm} = require('./elm');
+const app = Elm.MyModule.init();
+exports.handler = (event, context, callback) => {
+    const caller = (output) => {
+        callback(null, output);
+        app.ports.outputEvent.unsubscribe(caller);
+    }
+    app.ports.outputEvent.subscribe(caller);
+    app.ports.inputEvent.send(event);
+}