finops: Replace Azure Cache for Redis by a Redis container

Lower POC cost for users.

Author: clemlesne

Diff for: Makefile

@@ -212,7 +212,7 @@ sync-local-config:
 			--query "[0].properties.template.containers[0].env[?name=='CONFIG_JSON'].value" \
 			--resource-group $(name_sanitized) \
 		| iconv -f utf-8 -t utf-8 -c \
-		| yq \
-			--output-format yaml \
+		| yq eval 'del(.cache)' \
+			--output-format=yaml \
 			--prettyPrint \
 		> config.yaml

Diff for: README.md

@@ -633,12 +633,6 @@ This totalizes $720.07 /month, $0.12 /hour, with the following breakdown:
 | Sweden Central | Serverless vCPU | $0.000024 /sec | $128.56 | Avg of 2 replicas with 1 vCPU |
 | Sweden Central | Serverless memory (average of 2 replicas) | $0.000003 /sec | $32.14 | Avg of 2 replicas with 2GB |
 
-[Azure Cache for Redis](https://azure.microsoft.com/en-us/pricing/details/cache/):
-
-| Region | Metric | Cost | Total (monthly $) | Note |
-|-|-|-|-|-|
-| Sweden Central | Standard C0 | $40.15 /month | $40.15 | Has 250MB of memory, should be upgraded for more intensive usage |
-
 [Azure AI Search](https://azure.microsoft.com/en-us/pricing/details/search/):
 
 | Region | Metric | Cost | Total (monthly $) | Note |

Diff for: app/helpers/config_models/cache.py

@@ -28,7 +28,7 @@ def instance(self) -> ICache:
 class RedisModel(BaseModel, frozen=True):
     database: int = Field(default=0, ge=0)
     host: str
-    password: SecretStr
+    password: SecretStr | None = None
     port: int = 6379
     ssl: bool = True
 

Diff for: app/persistence/redis.py

@@ -138,7 +138,9 @@ async def _use_connection_pool(self) -> ConnectionPool:
             host=self._config.host,
             port=self._config.port,
             # Authentication
-            password=self._config.password.get_secret_value(),
+            password=self._config.password.get_secret_value()
+            if self._config.password
+            else None,
         )
 
     @asynccontextmanager

Diff for: cicd/bicep/app.bicep

@@ -101,9 +101,8 @@ var config = {
   cache: {
     mode: 'redis'
     redis: {
-      host: redis.properties.hostName
-      password: redis.listKeys().primaryKey
-      port: redis.properties.sslPort
+      host: redis.name
+      ssl: false
     }
   }
   app_configuration: {
@@ -160,6 +159,48 @@ resource acaEnv 'Microsoft.App/managedEnvironments@2024-02-02-preview' = {
   }
 }
 
+resource redis 'Microsoft.App/containerApps@2024-03-01' = {
+  name: 'redis'
+  location: location
+  tags: tags
+  properties: {
+    configuration: {
+      activeRevisionsMode: 'Single'
+      ingress: {
+        exposedPort: 6379
+        targetPort: 6379
+        transport: 'tcp'
+      }
+    }
+    environmentId: acaEnv.id
+    template: {
+      scale: {
+        maxReplicas: 1
+        minReplicas: 1
+      }
+      containers: [
+        {
+          image: 'redis/redis-stack-server:7.4.0-v2'
+          name: 'redis'
+          resources: {
+            cpu: json('0.5')
+            memory: '1Gi'
+          }
+          probes: [
+            {
+              type: 'Startup'
+              tcpSocket: {
+                port: 6379
+              }
+              initialDelaySeconds: 10
+            }
+          ]
+        }
+      ]
+    }
+  }
+}
+
 var containerAppScaleRules = [
   for queue in [
     callQueue.name
@@ -909,21 +950,6 @@ resource translate 'Microsoft.CognitiveServices/accounts@2024-06-01-preview' = {
   }
 }
 
-resource redis 'Microsoft.Cache/redis@2024-03-01' = {
-  name: prefix
-  location: location
-  tags: tags
-  properties: {
-    sku: {
-      capacity: 0 // 250 MB of data
-      family: 'C'
-      name: 'Standard' // First tier with SLA
-    }
-    minimumTlsVersion: '1.2'
-    redisVersion: '6' // v6.x
-  }
-}
-
 resource configStore 'Microsoft.AppConfiguration/configurationStores@2023-03-01' = {
   name: prefix
   location: location