server readiness

README.md

@@ -52,12 +52,10 @@
 ## commands
 
 ```bash
-
 kubectl rollout restart deployment/name # to update image
 kubectl get ingress # ingress exposed url
-
-aws eks update-kubeconfig --region ap-south-1 --name cluster
 kubectl exec --stdin --tty pod/postgres-0 -- /bin/bash
+aws eks update-kubeconfig --region ap-south-1 --name cluster
 ```
 
 ## GHCR image build and push
@@ -319,4 +317,4 @@ go-todo-api-hpa   Deployment/go-todo-api   23%/30%   1         10        3
 go-todo-api-hpa   Deployment/go-todo-api   20%/30%   1         10        3          52m
 go-todo-api-hpa   Deployment/go-todo-api   8%/30%    1         10        3          53m
 go-todo-api-hpa   Deployment/go-todo-api   0%/30%    1         10        3          53m
-```
+```

database/database.go

@@ -8,11 +8,18 @@ import (
 	"log"
 )
 
-var database_ready = false
 var Connection *pg.DB
 
 func IsDtabaseReady() bool {
-	return database_ready
+	ctx := Connection.Context()
+	var version string
+
+	_, err := Connection.QueryOneContext(ctx, pg.Scan(&version), "SELECT version()")
+	if err != nil {
+		log.Printf("Failed to connect to database")
+		return false
+	}
+	return true
 }
 
 func GetDatabase() **pg.DB {
@@ -49,7 +56,7 @@ func Connect() *pg.DB {
 	}
 
 	log.Printf("Connected to db")
-	database_ready = true
+
 	return Connection
 }
 

k8s-deployments/deployment.yml

@@ -15,6 +15,15 @@ spec:
     spec: # Spec for the container which will run in the Pod
       imagePullSecrets:
         - name: dockerconfigjson-github-com
+      # initContainers:
+      #   - name: check-db-ready
+      #     image: postgres:latest
+      #     command: ['sh', '-c', 
+      #       'until pg_isready -h $DB_HOST -p $DB_PORT; 
+      #       do echo waiting for database; sleep 2; done;']
+      #     envFrom: 
+      #       - secretRef:
+      #           name: app-secret
       containers:
         - name: go-todo-api
           image: ghcr.io/harshsinghvi/golang-postgres-kubernetes:latest