Changed: DB Params

templ/examples/counter/Dockerfile

@@ -0,0 +1,3 @@
+FROM pierrezemb/gostatic
+COPY ./public/ /srv/http/
+ENTRYPOINT ["/goStatic", "-port", "8080"]

templ/examples/counter/README.md

@@ -0,0 +1,25 @@
+## Tasks
+
+### generate
+
+```sh
+templ generate
+```
+
+### deploy
+
+requires: generate
+dir: cdk
+
+```sh
+cdk deploy
+```
+
+### deploy-hotswap
+
+requires: generate
+dir: cdk
+
+```sh
+cdk deploy --hotswap
+```

templ/examples/counter/assets/favicon/about.txt

@@ -0,0 +1,6 @@
+This favicon was generated using the following font:
+
+- Font Title: Leckerli One
+- Font Author: Copyright (c) 2011 Gesine Todt (www.gesine-todt.de), with Reserved Font Names "Leckerli"
+- Font Source: http://fonts.gstatic.com/s/leckerlione/v16/V8mCoQH8VCsNttEnxnGQ-1itLZxcBtItFw.ttf
+- Font License: SIL Open Font License, 1.1 (http://scripts.sil.org/OFL))

templ/examples/counter/assets/favicon/site.webmanifest

@@ -0,0 +1 @@
+{"name":"","short_name":"","icons":[{"src":"/assets/favicon/android-chrome-192x192.png","sizes":"192x192","type":"image/png"},{"src":"/assets/favicon/android-chrome-512x512.png","sizes":"512x512","type":"image/png"}],"theme_color":"#ffffff","background_color":"#ffffff","display":"standalone"}

templ/examples/counter/cdk/.gitignore

@@ -0,0 +1,19 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# go.sum should be committed
+!go.sum
+
+# CDK asset staging directory
+.cdk.staging
+cdk.out

templ/examples/counter/cdk/cdk.json

@@ -0,0 +1,47 @@
+{
+  "app": "go mod download && go run stack.go",
+  "watch": {
+    "include": [
+      "**"
+    ],
+    "exclude": [
+      "README.md",
+      "cdk*.json",
+      "go.mod",
+      "go.sum",
+      "**/*test.go"
+    ]
+  },
+  "context": {
+    "@aws-cdk/aws-lambda:recognizeLayerVersion": true,
+    "@aws-cdk/core:checkSecretUsage": true,
+    "@aws-cdk/core:target-partitions": [
+      "aws",
+      "aws-cn"
+    ],
+    "@aws-cdk-containers/ecs-service-extensions:enableDefaultLogDriver": true,
+    "@aws-cdk/aws-ec2:uniqueImdsv2TemplateName": true,
+    "@aws-cdk/aws-ecs:arnFormatIncludesClusterName": true,
+    "@aws-cdk/aws-iam:minimizePolicies": true,
+    "@aws-cdk/core:validateSnapshotRemovalPolicy": true,
+    "@aws-cdk/aws-codepipeline:crossAccountKeyAliasStackSafeResourceName": true,
+    "@aws-cdk/aws-s3:createDefaultLoggingPolicy": true,
+    "@aws-cdk/aws-sns-subscriptions:restrictSqsDescryption": true,
+    "@aws-cdk/aws-apigateway:disableCloudWatchRole": true,
+    "@aws-cdk/core:enablePartitionLiterals": true,
+    "@aws-cdk/aws-events:eventsTargetQueueSameAccount": true,
+    "@aws-cdk/aws-iam:standardizedServicePrincipals": true,
+    "@aws-cdk/aws-ecs:disableExplicitDeploymentControllerForCircuitBreaker": true,
+    "@aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName": true,
+    "@aws-cdk/aws-s3:serverAccessLogsUseBucketPolicy": true,
+    "@aws-cdk/aws-route53-patters:useCertificate": true,
+    "@aws-cdk/customresources:installLatestAwsSdkDefault": false,
+    "@aws-cdk/aws-rds:databaseProxyUniqueResourceName": true,
+    "@aws-cdk/aws-codedeploy:removeAlarmsFromDeploymentGroup": true,
+    "@aws-cdk/aws-apigateway:authorizerChangeDeploymentLogicalId": true,
+    "@aws-cdk/aws-ec2:launchTemplateDefaultUserData": true,
+    "@aws-cdk/aws-secretsmanager:useAttachedSecretResourcePolicyForSecretTargetAttachments": true,
+    "@aws-cdk/aws-redshift:columnId": true,
+    "@aws-cdk/aws-stepfunctions-tasks:enableEmrServicePolicyV2": true
+  }
+}

templ/examples/counter/cdk/stack.go

@@ -0,0 +1,136 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/aws/aws-cdk-go/awscdk/v2"
+	"github.com/aws/aws-cdk-go/awscdk/v2/awscloudfront"
+	"github.com/aws/aws-cdk-go/awscdk/v2/awscloudfrontorigins"
+	"github.com/aws/aws-cdk-go/awscdk/v2/awsdynamodb"
+	"github.com/aws/aws-cdk-go/awscdk/v2/awsiam"
+	"github.com/aws/aws-cdk-go/awscdk/v2/awslambda"
+	"github.com/aws/aws-cdk-go/awscdk/v2/awss3"
+	"github.com/aws/aws-cdk-go/awscdk/v2/awss3deployment"
+	awslambdago "github.com/aws/aws-cdk-go/awscdklambdagoalpha/v2"
+	"github.com/aws/constructs-go/constructs/v10"
+	"github.com/aws/jsii-runtime-go"
+)
+
+type CounterStackProps struct {
+	awscdk.StackProps
+}
+
+func NewCounterStack(scope constructs.Construct, id string, props *CounterStackProps) awscdk.Stack {
+	var sprops awscdk.StackProps
+	if props != nil {
+		sprops = props.StackProps
+	}
+	stack := awscdk.NewStack(scope, &id, &sprops)
+
+	// Create a global count database.
+	db := awsdynamodb.NewTable(stack, jsii.String("count"), &awsdynamodb.TableProps{
+		PartitionKey: &awsdynamodb.Attribute{
+			Name: jsii.String("_pk"),
+			Type: awsdynamodb.AttributeType_STRING,
+		},
+		BillingMode: awsdynamodb.BillingMode_PAY_PER_REQUEST,
+		// Change this for production systems.
+		RemovalPolicy:       awscdk.RemovalPolicy_DESTROY,
+		TimeToLiveAttribute: jsii.String("_ttl"),
+	})
+
+	// Strip the binary, and remove the deprecated Lambda SDK RPC code for performance.
+	// These options are not required, but make cold start faster.
+	bundlingOptions := &awslambdago.BundlingOptions{
+		GoBuildFlags: &[]*string{jsii.String(`-ldflags "-s -w" -tags lambda.norpc`)},
+	}
+	f := awslambdago.NewGoFunction(stack, jsii.String("handler"), &awslambdago.GoFunctionProps{
+		Runtime:      awslambda.Runtime_PROVIDED_AL2(),
+		MemorySize:   jsii.Number(1024),
+		Architecture: awslambda.Architecture_ARM_64(),
+		Entry:        jsii.String("../lambda"),
+		Bundling:     bundlingOptions,
+		Environment: &map[string]*string{
+			"TABLE_NAME": db.TableName(),
+		},
+	})
+	// Grant DB access.
+	db.GrantReadWriteData(f)
+	// Add a Function URL.
+	lambdaURL := f.AddFunctionUrl(&awslambda.FunctionUrlOptions{
+		AuthType: awslambda.FunctionUrlAuthType_NONE,
+	})
+	awscdk.NewCfnOutput(stack, jsii.String("lambdaFunctionUrl"), &awscdk.CfnOutputProps{
+		ExportName: jsii.String("lambdaFunctionUrl"),
+		Value:      lambdaURL.Url(),
+	})
+
+	assetsBucket := awss3.NewBucket(stack, jsii.String("assets"), &awss3.BucketProps{
+		BlockPublicAccess: awss3.BlockPublicAccess_BLOCK_ALL(),
+		Encryption:        awss3.BucketEncryption_S3_MANAGED,
+		EnforceSSL:        jsii.Bool(true),
+		RemovalPolicy:     awscdk.RemovalPolicy_DESTROY,
+		Versioned:         jsii.Bool(false),
+	})
+	// Allow CloudFront to read from the bucket.
+	cfOAI := awscloudfront.NewOriginAccessIdentity(stack, jsii.String("cfnOriginAccessIdentity"), &awscloudfront.OriginAccessIdentityProps{})
+	cfs := awsiam.NewPolicyStatement(&awsiam.PolicyStatementProps{})
+	cfs.AddActions(jsii.String("s3:GetBucket*"))
+	cfs.AddActions(jsii.String("s3:GetObject*"))
+	cfs.AddActions(jsii.String("s3:List*"))
+	cfs.AddResources(assetsBucket.BucketArn())
+	cfs.AddResources(jsii.String(fmt.Sprintf("%v/*", *assetsBucket.BucketArn())))
+	cfs.AddCanonicalUserPrincipal(cfOAI.CloudFrontOriginAccessIdentityS3CanonicalUserId())
+	assetsBucket.AddToResourcePolicy(cfs)
+
+	// Add a CloudFront distribution to route between the public directory and the Lambda function URL.
+	lambdaURLDomain := awscdk.Fn_Select(jsii.Number(2), awscdk.Fn_Split(jsii.String("/"), lambdaURL.Url(), nil))
+	lambdaOrigin := awscloudfrontorigins.NewHttpOrigin(lambdaURLDomain, &awscloudfrontorigins.HttpOriginProps{
+		ProtocolPolicy: awscloudfront.OriginProtocolPolicy_HTTPS_ONLY,
+	})
+	cf := awscloudfront.NewDistribution(stack, jsii.String("customerFacing"), &awscloudfront.DistributionProps{
+		DefaultBehavior: &awscloudfront.BehaviorOptions{
+			AllowedMethods:       awscloudfront.AllowedMethods_ALLOW_ALL(),
+			Origin:               lambdaOrigin,
+			CachedMethods:        awscloudfront.CachedMethods_CACHE_GET_HEAD(),
+			OriginRequestPolicy:  awscloudfront.OriginRequestPolicy_ALL_VIEWER_EXCEPT_HOST_HEADER(),
+			CachePolicy:          awscloudfront.CachePolicy_CACHING_DISABLED(),
+			ViewerProtocolPolicy: awscloudfront.ViewerProtocolPolicy_REDIRECT_TO_HTTPS,
+		},
+		PriceClass: awscloudfront.PriceClass_PRICE_CLASS_100,
+	})
+
+	// Add /assets* to the distribution backed by S3.
+	assetsOrigin := awscloudfrontorigins.NewS3Origin(assetsBucket, &awscloudfrontorigins.S3OriginProps{
+		// Get content from the / directory in the bucket.
+		OriginPath:           jsii.String("/"),
+		OriginAccessIdentity: cfOAI,
+	})
+	cf.AddBehavior(jsii.String("/assets*"), assetsOrigin, nil)
+
+	// Export the domain.
+	awscdk.NewCfnOutput(stack, jsii.String("cloudFrontDomain"), &awscdk.CfnOutputProps{
+		ExportName: jsii.String("cloudfrontDomain"),
+		Value:      cf.DomainName(),
+	})
+
+	// Deploy the contents of the ./assets directory to the S3 bucket.
+	awss3deployment.NewBucketDeployment(stack, jsii.String("assetsDeployment"), &awss3deployment.BucketDeploymentProps{
+		DestinationBucket: assetsBucket,
+		Sources: &[]awss3deployment.ISource{
+			awss3deployment.Source_Asset(jsii.String("../assets"), nil),
+		},
+		DestinationKeyPrefix: jsii.String("assets"),
+		Distribution:         cf,
+		DistributionPaths:    jsii.Strings("/assets*"),
+	})
+
+	return stack
+}
+
+func main() {
+	defer jsii.Close()
+	app := awscdk.NewApp(nil)
+	NewCounterStack(app, "CounterStack", &CounterStackProps{})
+	app.Synth(nil)
+}

templ/examples/counter/components/components.templ

@@ -0,0 +1,62 @@
+package components
+
+import "strconv"
+
+css border() {
+	border: 1px solid #eeeeee;
+	border-radius: 4px;
+	margin: 10px;
+	padding-top: 30px;
+	padding-bottom: 30px;
+}
+
+templ counts(global, session int) {
+	<form id="countsForm" action="/" method="POST" hx-post="/" hx-select="#countsForm" hx-swap="outerHTML">
+		<div class="columns">
+			<div class={ "column", "has-text-centered", "is-primary", border }>
+				<h1 class="title is-size-1 has-text-centered">{ strconv.Itoa(global) }</h1>
+				<p class="subtitle has-text-centered">Global</p>
+				<div><button class="button is-primary" type="submit" name="global" value="global">+1</button></div>
+			</div>
+			<div class={ "column", "has-text-centered", border }>
+				<h1 class="title is-size-1 has-text-centered">{ strconv.Itoa(session) }</h1>
+				<p class="subtitle has-text-centered">Session</p>
+				<div><button class="button is-secondary" type="submit" name="session" value="session">+1</button></div>
+			</div>
+		</div>
+	</form>
+}
+
+templ Page(global, session int) {
+	<html>
+		<head>
+			<meta charset="UTF-8"/>
+			<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+			<title>Counts</title>
+			<link rel="stylesheet" href="/assets/css/bulma.min.css"/>
+			<link rel="apple-touch-icon" sizes="180x180" href="/assets/favicon/apple-touch-icon.png"/>
+			<link rel="icon" type="image/png" sizes="32x32" href="/assets/favicon/favicon-32x32.png"/>
+			<link rel="icon" type="image/png" sizes="16x16" href="/assets/favicon/favicon-16x16.png"/>
+			<link rel="manifest" href="/assets/favicon/site.webmanifest"/>
+			<script src="/assets/js/htmx.min.js"></script>
+		</head>
+		<body class="bg-gray-100">
+			<header class="hero is-primary">
+				<div class="hero-body">
+					<div class="container">
+						<h1 class="title">Counts</h1>
+					</div>
+				</div>
+			</header>
+			<section class="section">
+				<div class="container">
+					<div class="columns is-centered">
+						<div class="column is-half">
+							@counts(global, session)
+						</div>
+					</div>
+				</div>
+			</section>
+		</body>
+	</html>
+}

templ/examples/counter/components/components_templ.go

@@ -0,0 +1,163 @@
+// Code generated by templ - DO NOT EDIT.
+
+// templ: version: v0.3.833
+package components
+
+//lint:file-ignore SA4006 This context is only used if a nested component is present.
+
+import "github.com/a-h/templ"
+import templruntime "github.com/a-h/templ/runtime"
+
+import "strconv"
+
+func border() templ.CSSClass {
+	templ_7745c5c3_CSSBuilder := templruntime.GetBuilder()
+	templ_7745c5c3_CSSBuilder.WriteString(`border:1px solid #eeeeee;`)
+	templ_7745c5c3_CSSBuilder.WriteString(`border-radius:4px;`)
+	templ_7745c5c3_CSSBuilder.WriteString(`margin:10px;`)
+	templ_7745c5c3_CSSBuilder.WriteString(`padding-top:30px;`)
+	templ_7745c5c3_CSSBuilder.WriteString(`padding-bottom:30px;`)
+	templ_7745c5c3_CSSID := templ.CSSID(`border`, templ_7745c5c3_CSSBuilder.String())
+	return templ.ComponentCSSClass{
+		ID:    templ_7745c5c3_CSSID,
+		Class: templ.SafeCSS(`.` + templ_7745c5c3_CSSID + `{` + templ_7745c5c3_CSSBuilder.String() + `}`),
+	}
+}
+
+func counts(global, session int) templ.Component {
+	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
+		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
+		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
+			return templ_7745c5c3_CtxErr
+		}
+		templ_7745c5c3_Buffer, templ_7745c5c3_IsBuffer := templruntime.GetBuffer(templ_7745c5c3_W)
+		if !templ_7745c5c3_IsBuffer {
+			defer func() {
+				templ_7745c5c3_BufErr := templruntime.ReleaseBuffer(templ_7745c5c3_Buffer)
+				if templ_7745c5c3_Err == nil {
+					templ_7745c5c3_Err = templ_7745c5c3_BufErr
+				}
+			}()
+		}
+		ctx = templ.InitializeContext(ctx)
+		templ_7745c5c3_Var1 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var1 == nil {
+			templ_7745c5c3_Var1 = templ.NopComponent
+		}
+		ctx = templ.ClearChildren(ctx)
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<form id=\"countsForm\" action=\"/\" method=\"POST\" hx-post=\"/\" hx-select=\"#countsForm\" hx-swap=\"outerHTML\"><div class=\"columns\">")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var2 = []any{"column", "has-text-centered", "is-primary", border}
+		templ_7745c5c3_Err = templ.RenderCSSItems(ctx, templ_7745c5c3_Buffer, templ_7745c5c3_Var2...)
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 2, "<div class=\"")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var3 string
+		templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(templ.CSSClasses(templ_7745c5c3_Var2).String())
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `templ/examples/counter/components/components.templ`, Line: 1, Col: 0}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var3))
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 3, "\"><h1 class=\"title is-size-1 has-text-centered\">")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var4 string
+		templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.JoinStringErrs(strconv.Itoa(global))
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `templ/examples/counter/components/components.templ`, Line: 17, Col: 72}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var4))
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 4, "</h1><p class=\"subtitle has-text-centered\">Global</p><div><button class=\"button is-primary\" type=\"submit\" name=\"global\" value=\"global\">+1</button></div></div>")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var5 = []any{"column", "has-text-centered", border}
+		templ_7745c5c3_Err = templ.RenderCSSItems(ctx, templ_7745c5c3_Buffer, templ_7745c5c3_Var5...)
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 5, "<div class=\"")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var6 string
+		templ_7745c5c3_Var6, templ_7745c5c3_Err = templ.JoinStringErrs(templ.CSSClasses(templ_7745c5c3_Var5).String())
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `templ/examples/counter/components/components.templ`, Line: 1, Col: 0}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var6))
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 6, "\"><h1 class=\"title is-size-1 has-text-centered\">")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		var templ_7745c5c3_Var7 string
+		templ_7745c5c3_Var7, templ_7745c5c3_Err = templ.JoinStringErrs(strconv.Itoa(session))
+		if templ_7745c5c3_Err != nil {
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `templ/examples/counter/components/components.templ`, Line: 22, Col: 73}
+		}
+		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var7))
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 7, "</h1><p class=\"subtitle has-text-centered\">Session</p><div><button class=\"button is-secondary\" type=\"submit\" name=\"session\" value=\"session\">+1</button></div></div></div></form>")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		return nil
+	})
+}
+
+func Page(global, session int) templ.Component {
+	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
+		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
+		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
+			return templ_7745c5c3_CtxErr
+		}
+		templ_7745c5c3_Buffer, templ_7745c5c3_IsBuffer := templruntime.GetBuffer(templ_7745c5c3_W)
+		if !templ_7745c5c3_IsBuffer {
+			defer func() {
+				templ_7745c5c3_BufErr := templruntime.ReleaseBuffer(templ_7745c5c3_Buffer)
+				if templ_7745c5c3_Err == nil {
+					templ_7745c5c3_Err = templ_7745c5c3_BufErr
+				}
+			}()
+		}
+		ctx = templ.InitializeContext(ctx)
+		templ_7745c5c3_Var8 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var8 == nil {
+			templ_7745c5c3_Var8 = templ.NopComponent
+		}
+		ctx = templ.ClearChildren(ctx)
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 8, "<html><head><meta charset=\"UTF-8\"><meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"><title>Counts</title><link rel=\"stylesheet\" href=\"/assets/css/bulma.min.css\"><link rel=\"apple-touch-icon\" sizes=\"180x180\" href=\"/assets/favicon/apple-touch-icon.png\"><link rel=\"icon\" type=\"image/png\" sizes=\"32x32\" href=\"/assets/favicon/favicon-32x32.png\"><link rel=\"icon\" type=\"image/png\" sizes=\"16x16\" href=\"/assets/favicon/favicon-16x16.png\"><link rel=\"manifest\" href=\"/assets/favicon/site.webmanifest\"><script src=\"/assets/js/htmx.min.js\"></script></head><body class=\"bg-gray-100\"><header class=\"hero is-primary\"><div class=\"hero-body\"><div class=\"container\"><h1 class=\"title\">Counts</h1></div></div></header><section class=\"section\"><div class=\"container\"><div class=\"columns is-centered\"><div class=\"column is-half\">")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = counts(global, session).Render(ctx, templ_7745c5c3_Buffer)
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 9, "</div></div></div></section></body></html>")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		return nil
+	})
+}
+
+var _ = templruntime.GeneratedTemplate

templ/examples/counter/db/db.go

@@ -0,0 +1,189 @@
+package db
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
+)
+
+type OptionsFunc func(*CountStore)
+
+func WithClient(client *dynamodb.Client) func(*CountStore) {
+	return func(ms *CountStore) {
+		ms.db = client
+	}
+}
+
+func NewCountStore(tableName, region string, options ...OptionsFunc) (s *CountStore, err error) {
+	s = &CountStore{
+		tableName: tableName,
+	}
+	for _, o := range options {
+		o(s)
+	}
+	if s.db == nil {
+		cfg, err := config.LoadDefaultConfig(context.Background(), config.WithRegion(region))
+		if err != nil {
+			return s, err
+		}
+		s.db = dynamodb.NewFromConfig(cfg)
+	}
+	return
+}
+
+type CountStore struct {
+	db        *dynamodb.Client
+	tableName string
+}
+
+func stripEmpty(strings []string) (op []string) {
+	for _, s := range strings {
+		if s != "" {
+			op = append(op, s)
+		}
+	}
+	return
+}
+
+type countRecord struct {
+	PK    string `dynamodbav:"_pk"`
+	Count int    `dynamodbav:"count"`
+}
+
+func (s CountStore) BatchGet(ctx context.Context, ids ...string) (counts []int, err error) {
+	nonEmptyIDs := stripEmpty(ids)
+	if len(nonEmptyIDs) == 0 {
+		return nil, nil
+	}
+
+	// Make DynamoDB keys.
+	ris := make(map[string]types.KeysAndAttributes)
+	for _, id := range nonEmptyIDs {
+		ri := ris[s.tableName]
+		ri.Keys = append(ris[s.tableName].Keys, map[string]types.AttributeValue{
+			"_pk": &types.AttributeValueMemberS{
+				Value: id,
+			},
+		})
+		ri.ConsistentRead = aws.Bool(true)
+		ris[s.tableName] = ri
+	}
+
+	// Execute the batch request.
+	var batchResponses []map[string]types.AttributeValue
+
+	// DynamoDB might not process everything, so we need a loop.
+	var unprocessedAttempts int
+	for {
+		var bgio *dynamodb.BatchGetItemOutput
+		bgio, err = s.db.BatchGetItem(ctx, &dynamodb.BatchGetItemInput{
+			RequestItems: ris,
+		})
+		if err != nil {
+			return
+		}
+		for _, responses := range bgio.Responses {
+			batchResponses = append(batchResponses, responses...)
+		}
+		if len(bgio.UnprocessedKeys) > 0 {
+			ris = bgio.UnprocessedKeys
+			unprocessedAttempts++
+			if unprocessedAttempts > 3 {
+				err = fmt.Errorf("countstore: exceeded three attempts to get all counts")
+				return
+			}
+			continue
+		}
+		break
+	}
+
+	// Process the responses into structs.
+	crs := []countRecord{}
+	err = attributevalue.UnmarshalListOfMaps(batchResponses, &crs)
+	if err != nil {
+		err = fmt.Errorf("countstore: failed to unmarshal result of BatchGet: %w", err)
+		return
+	}
+
+	// Match up the inputs to the records.
+	idToCount := make(map[string]int, len(ids))
+	for _, cr := range crs {
+		idToCount[cr.PK] = cr.Count
+	}
+
+	// Create the output in the right order.
+	// Missing values are defaulted to zero.
+	for _, id := range ids {
+		counts = append(counts, idToCount[id])
+	}
+
+	return
+}
+
+func (s CountStore) Get(ctx context.Context, id string) (count int, err error) {
+	if id == "" {
+		return
+	}
+	gio, err := s.db.GetItem(ctx, &dynamodb.GetItemInput{
+		Key: map[string]types.AttributeValue{
+			"_pk": &types.AttributeValueMemberS{
+				Value: id,
+			},
+		},
+		TableName:      &s.tableName,
+		ConsistentRead: aws.Bool(true),
+	})
+	if err != nil || gio.Item == nil {
+		return
+	}
+
+	var cr countRecord
+	err = attributevalue.UnmarshalMap(gio.Item, &cr)
+	if err != nil {
+		return 0, fmt.Errorf("countstore: failed to process result of Get: %w", err)
+	}
+	count = cr.Count
+
+	return
+}
+
+func (s CountStore) Increment(ctx context.Context, id string) (count int, err error) {
+	if id == "" {
+		return
+	}
+	uio, err := s.db.UpdateItem(ctx, &dynamodb.UpdateItemInput{
+		Key: map[string]types.AttributeValue{
+			"_pk": &types.AttributeValueMemberS{
+				Value: id,
+			},
+		},
+		TableName:        &s.tableName,
+		UpdateExpression: aws.String("SET #c = if_not_exists(#c, :zero) + :one"),
+		ExpressionAttributeNames: map[string]string{
+			"#c": "count",
+		},
+		ExpressionAttributeValues: map[string]types.AttributeValue{
+			":zero": &types.AttributeValueMemberN{Value: "0"},
+			":one":  &types.AttributeValueMemberN{Value: "1"},
+		},
+		ReturnValues: types.ReturnValueAllNew,
+	})
+	if err != nil {
+		return
+	}
+
+	// Parse the response.
+	var cr countRecord
+	err = attributevalue.UnmarshalMap(uio.Attributes, &cr)
+	if err != nil {
+		return 0, fmt.Errorf("countstore: failed to process result of Increment: %w", err)
+	}
+	count = cr.Count
+
+	return
+}

templ/examples/counter/go.mod

@@ -0,0 +1,53 @@
+module github.com/a-h/templ/examples/counter
+
+go 1.23
+
+toolchain go1.23.3
+
+require (
+	github.com/a-h/templ v0.2.234-0.20230427112944-80f0dc03a8a8
+	github.com/akrylysov/algnhsa v1.1.0
+	github.com/aws/aws-cdk-go/awscdk/v2 v2.147.3
+	github.com/aws/aws-cdk-go/awscdklambdagoalpha/v2 v2.147.3-alpha.0
+	github.com/aws/aws-sdk-go-v2 v1.30.1
+	github.com/aws/aws-sdk-go-v2/config v1.27.24
+	github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.14.7
+	github.com/aws/aws-sdk-go-v2/service/dynamodb v1.34.1
+	github.com/aws/constructs-go/constructs/v10 v10.3.0
+	github.com/aws/jsii-runtime-go v1.101.0
+	github.com/segmentio/ksuid v1.0.4
+	golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8
+)
+
+require (
+	github.com/Masterminds/semver/v3 v3.2.1 // indirect
+	github.com/aws/aws-lambda-go v1.47.0 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.24 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.9 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.13 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.13 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 // indirect
+	github.com/aws/aws-sdk-go-v2/service/dynamodbstreams v1.22.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/endpoint-discovery v1.9.14 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.15 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.22.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.26.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.30.1 // indirect
+	github.com/aws/smithy-go v1.20.3 // indirect
+	github.com/cdklabs/awscdk-asset-awscli-go/awscliv1/v2 v2.2.202 // indirect
+	github.com/cdklabs/awscdk-asset-kubectl-go/kubectlv20/v2 v2.1.2 // indirect
+	github.com/cdklabs/awscdk-asset-node-proxy-agent-go/nodeproxyagentv6/v2 v2.0.3 // indirect
+	github.com/fatih/color v1.17.0 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/yuin/goldmark v1.7.4 // indirect
+	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616 // indirect
+	golang.org/x/mod v0.20.0 // indirect
+	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/tools v0.24.0 // indirect
+)
+
+replace github.com/a-h/templ => ../../

templ/examples/counter/go.sum

@@ -0,0 +1,109 @@
+github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
+github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
+github.com/akrylysov/algnhsa v1.1.0 h1:G0SoP16tMRyiism7VNc3JFA0wq/cVgEkp/ExMVnc6PQ=
+github.com/akrylysov/algnhsa v1.1.0/go.mod h1:+bOweRs/WBu5awl+ifCoSYAuKVPAmoTk8XOMrZ1xwiw=
+github.com/aws/aws-cdk-go/awscdk/v2 v2.147.3 h1:7Wbi5d1f+RGn6fg9YzzMjD5D/rc/62zuFOtmJIed+B0=
+github.com/aws/aws-cdk-go/awscdk/v2 v2.147.3/go.mod h1:WF3lt7ah4wNktbClICIBbKdITtCqyCrPBQl3nkaLug4=
+github.com/aws/aws-cdk-go/awscdklambdagoalpha/v2 v2.147.3-alpha.0 h1:j+eT+oCMXTQZL+9ERI1FBDxkFApHPZTYZhtj9zalvlo=
+github.com/aws/aws-cdk-go/awscdklambdagoalpha/v2 v2.147.3-alpha.0/go.mod h1:uUP2KJ0yXDOlAl5VmSN36cSpw5Ajv10JVhPl1M7WJ6A=
+github.com/aws/aws-lambda-go v1.47.0 h1:0H8s0vumYx/YKs4sE7YM0ktwL2eWse+kfopsRI1sXVI=
+github.com/aws/aws-lambda-go v1.47.0/go.mod h1:dpMpZgvWx5vuQJfBt0zqBha60q7Dd7RfgJv23DymV8A=
+github.com/aws/aws-sdk-go-v2 v1.30.1 h1:4y/5Dvfrhd1MxRDD77SrfsDaj8kUkkljU7XE83NPV+o=
+github.com/aws/aws-sdk-go-v2 v1.30.1/go.mod h1:nIQjQVp5sfpQcTc9mPSr1B0PaWK5ByX9MOoDadSN4lc=
+github.com/aws/aws-sdk-go-v2/config v1.27.24 h1:NM9XicZ5o1CBU/MZaHwFtimRpWx9ohAUAqkG6AqSqPo=
+github.com/aws/aws-sdk-go-v2/config v1.27.24/go.mod h1:aXzi6QJTuQRVVusAO8/NxpdTeTyr/wRcybdDtfUwJSs=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.24 h1:YclAsrnb1/GTQNt2nzv+756Iw4mF8AOzcDfweWwwm/M=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.24/go.mod h1:Hld7tmnAkoBQdTMNYZGzztzKRdA4fCdn9L83LOoigac=
+github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.14.7 h1:pPhmvNKbgb9l5VHcPmMx9g+FHtRbY+ba2J6GefXQGEI=
+github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.14.7/go.mod h1:OZU7QRvIYXhKry99PttkDTQyN8yCo8RzYjhIKHdQXoo=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.9 h1:Aznqksmd6Rfv2HQN9cpqIV/lQRMaIpJkLLaJ1ZI76no=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.9/go.mod h1:WQr3MY7AxGNxaqAtsDWn+fBxmd4XvLkzeqQ8P1VM0/w=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.13 h1:5SAoZ4jYpGH4721ZNoS1znQrhOfZinOhc4XuTXx/nVc=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.13/go.mod h1:+rdA6ZLpaSeM7tSg/B0IEDinCIBJGmW8rKDFkYpP04g=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.13 h1:WIijqeaAO7TYFLbhsZmi2rgLEAtWOC1LhxCAVTJlSKw=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.13/go.mod h1:i+kbfa76PQbWw/ULoWnp51EYVWH4ENln76fLQE3lXT8=
+github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 h1:hT8rVHwugYE2lEfdFE0QWVo81lF7jMrYJVDWI+f+VxU=
+github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0/go.mod h1:8tu/lYfQfFe6IGnaOdrpVgEL2IrrDOf6/m9RQum4NkY=
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templ/examples/counter/handlers/default.go

@@ -0,0 +1,81 @@
+package handlers
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/a-h/templ/examples/counter/components"
+	"github.com/a-h/templ/examples/counter/services"
+	"github.com/a-h/templ/examples/counter/session"
+	"golang.org/x/exp/slog"
+)
+
+type CountService interface {
+	Increment(ctx context.Context, it services.IncrementType, sessionID string) (counts services.Counts, err error)
+	Get(ctx context.Context, sessionID string) (counts services.Counts, err error)
+}
+
+func New(log *slog.Logger, cs CountService) *DefaultHandler {
+	return &DefaultHandler{
+		Log:          log,
+		CountService: cs,
+	}
+}
+
+type DefaultHandler struct {
+	Log          *slog.Logger
+	CountService CountService
+}
+
+func (h *DefaultHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.Method == http.MethodPost {
+		h.Post(w, r)
+		return
+	}
+	h.Get(w, r)
+}
+
+func (h *DefaultHandler) Get(w http.ResponseWriter, r *http.Request) {
+	var props ViewProps
+	var err error
+	props.Counts, err = h.CountService.Get(r.Context(), session.ID(r))
+	if err != nil {
+		h.Log.Error("failed to get counts", slog.Any("error", err))
+		http.Error(w, "failed to get counts", http.StatusInternalServerError)
+		return
+	}
+	h.View(w, r, props)
+}
+
+func (h *DefaultHandler) Post(w http.ResponseWriter, r *http.Request) {
+	r.ParseForm()
+
+	// Decide the action to take based on the button that was pressed.
+	var it services.IncrementType
+	if r.Form.Has("global") {
+		it = services.IncrementTypeGlobal
+	}
+	if r.Form.Has("session") {
+		it = services.IncrementTypeSession
+	}
+
+	counts, err := h.CountService.Increment(r.Context(), it, session.ID(r))
+	if err != nil {
+		h.Log.Error("failed to increment", slog.Any("error", err))
+		http.Error(w, "failed to increment", http.StatusInternalServerError)
+		return
+	}
+
+	// Display the view.
+	h.View(w, r, ViewProps{
+		Counts: counts,
+	})
+}
+
+type ViewProps struct {
+	Counts services.Counts
+}
+
+func (h *DefaultHandler) View(w http.ResponseWriter, r *http.Request, props ViewProps) {
+	components.Page(props.Counts.Global, props.Counts.Session).Render(r.Context(), w)
+}

templ/examples/counter/lambda/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"os"
+
+	"github.com/a-h/templ/examples/counter/db"
+	"github.com/a-h/templ/examples/counter/handlers"
+	"github.com/a-h/templ/examples/counter/services"
+	"github.com/a-h/templ/examples/counter/session"
+	"github.com/akrylysov/algnhsa"
+	"golang.org/x/exp/slog"
+)
+
+func main() {
+	// Create handlers.
+	log := slog.New(slog.NewJSONHandler(os.Stderr, nil))
+	s, err := db.NewCountStore(os.Getenv("TABLE_NAME"), os.Getenv("AWS_REGION"))
+	if err != nil {
+		log.Error("failed to create store", slog.Any("error", err))
+		os.Exit(1)
+	}
+	cs := services.NewCount(log, s)
+	h := handlers.New(log, cs)
+
+	// Add session middleware.
+	sh := session.NewMiddleware(h)
+
+	// Start Lambda.
+	algnhsa.ListenAndServe(sh, nil)
+}

templ/examples/counter/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/a-h/templ/examples/counter/db"
+	"github.com/a-h/templ/examples/counter/handlers"
+	"github.com/a-h/templ/examples/counter/services"
+	"github.com/a-h/templ/examples/counter/session"
+	"golang.org/x/exp/slog"
+)
+
+func main() {
+	log := slog.New(slog.NewJSONHandler(os.Stderr, nil))
+	s, err := db.NewCountStore(os.Getenv("TABLE_NAME"), os.Getenv("AWS_REGION"))
+	if err != nil {
+		log.Error("failed to create store", slog.Any("error", err))
+		os.Exit(1)
+	}
+	cs := services.NewCount(log, s)
+	h := handlers.New(log, cs)
+
+	var secureFlag = true
+	if os.Getenv("SECURE_FLAG") == "false" {
+		secureFlag = false
+	}
+
+	// Add session middleware.
+	sh := session.NewMiddleware(h, session.WithSecure(secureFlag))
+
+	server := &http.Server{
+		Addr:         "localhost:9000",
+		Handler:      sh,
+		ReadTimeout:  time.Second * 10,
+		WriteTimeout: time.Second * 10,
+	}
+
+	fmt.Printf("Listening on %v\n", server.Addr)
+	server.ListenAndServe()
+}

templ/examples/counter/services/count.go

@@ -0,0 +1,84 @@
+package services
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+
+	"github.com/a-h/templ/examples/counter/db"
+	"golang.org/x/exp/slog"
+)
+
+type Counts struct {
+	Global  int
+	Session int
+}
+
+type IncrementType int
+
+const (
+	IncrementTypeUnknown IncrementType = iota
+	IncrementTypeGlobal
+	IncrementTypeSession
+)
+
+var ErrUnknownIncrementType error = errors.New("unknown increment type")
+
+func NewCount(log *slog.Logger, cs *db.CountStore) Count {
+	return Count{
+		Log:        log,
+		CountStore: cs,
+	}
+}
+
+type Count struct {
+	Log        *slog.Logger
+	CountStore *db.CountStore
+}
+
+func (cs Count) Increment(ctx context.Context, it IncrementType, sessionID string) (counts Counts, err error) {
+	// Work out which operations to do.
+	var global, session func(ctx context.Context, id string) (count int, err error)
+	switch it {
+	case IncrementTypeGlobal:
+		global = cs.CountStore.Increment
+		session = cs.CountStore.Get
+	case IncrementTypeSession:
+		global = cs.CountStore.Get
+		session = cs.CountStore.Increment
+	default:
+		return counts, ErrUnknownIncrementType
+	}
+
+	// Run the operations in parallel.
+	var wg sync.WaitGroup
+	wg.Add(2)
+	errs := make([]error, 2)
+	go func() {
+		defer wg.Done()
+		counts.Global, errs[0] = global(ctx, "global")
+	}()
+	go func() {
+		defer wg.Done()
+		counts.Session, errs[1] = session(ctx, sessionID)
+	}()
+	wg.Wait()
+
+	return counts, errors.Join(errs...)
+}
+
+func (cs Count) Get(ctx context.Context, sessionID string) (counts Counts, err error) {
+	globalAndSessionCounts, err := cs.CountStore.BatchGet(ctx, "global", sessionID)
+	if err != nil {
+		err = fmt.Errorf("countservice: failed to get counts: %w", err)
+		return
+	}
+	if len(globalAndSessionCounts) != 2 {
+		err = fmt.Errorf("countservice: unexpected counts returned, expected 2, got %d", len(globalAndSessionCounts))
+		return
+	}
+	counts.Global = globalAndSessionCounts[0]
+	counts.Session = globalAndSessionCounts[1]
+	return
+}

templ/examples/counter/session/session.go

@@ -0,0 +1,56 @@
+package session
+
+import (
+	"net/http"
+
+	"github.com/segmentio/ksuid"
+)
+
+type MiddlewareOpts func(*Middleware)
+
+func NewMiddleware(next http.Handler, opts ...MiddlewareOpts) http.Handler {
+	mw := Middleware{
+		Next:     next,
+		Secure:   true,
+		HTTPOnly: true,
+	}
+	for _, opt := range opts {
+		opt(&mw)
+	}
+	return mw
+}
+
+func WithSecure(secure bool) MiddlewareOpts {
+	return func(m *Middleware) {
+		m.Secure = secure
+	}
+}
+
+func WithHTTPOnly(httpOnly bool) MiddlewareOpts {
+	return func(m *Middleware) {
+		m.HTTPOnly = httpOnly
+	}
+}
+
+type Middleware struct {
+	Next     http.Handler
+	Secure   bool
+	HTTPOnly bool
+}
+
+func ID(r *http.Request) (id string) {
+	cookie, err := r.Cookie("sessionID")
+	if err != nil {
+		return
+	}
+	return cookie.Value
+}
+
+func (mw Middleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	id := ID(r)
+	if id == "" {
+		id = ksuid.New().String()
+		http.SetCookie(w, &http.Cookie{Name: "sessionID", Value: id, Secure: mw.Secure, HttpOnly: mw.HTTPOnly})
+	}
+	mw.Next.ServeHTTP(w, r)
+}