meals-demo

Meals demo

Demo for a meals service. It's written in Go.

Deployment

The deployment is worked out for a local Kubernetes described at https://github.com/pgillich/kind-on-dev with default values. Add foodstore.kind-01.company.com to the /etc/hosts, similar to monitoring.kind-01.company.com.

Postgres

Run below command:

kubectl apply -k kubernetes/postgres

After a while, the postgres service can be accessed on a Load Balancer port, see:

k get svc -n postgres -o wide
NAME       TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)          AGE   SELECTOR
postgres   LoadBalancer   10.96.224.184   172.18.1.128   5432:31113/TCP   31m   app=postgres

The connection can be checked by psql, and the database should be created, for example:

psql -h 172.18.1.128 -U admin --password -p 5432 postgresdb
Password:
psql (12.9 (Ubuntu 12.9-0ubuntu0.20.04.1), server 10.1)
Type "help" for help.

postgresdb=# create database foodstore;

The app compiled by make build can also be run out of the Kubernetes cluster, for examle:

PORT=8080 SERVICE_DB_DIALECT=postgres SERVICE_DB_DSN="host=172.18.1.128 user=admin password=test123 dbname=foodstore port=5432 sslmode=disable" SERVICE_DB_SAMPLE=true SERVICE_DB_DEBUG=true ./build/bin/meals-demo

Image

The built image should be accessible from the cluster. The simplest way to make it accessible for Kind is loading the image, for example:

kind load docker-image --name demo pgillich/meals-demo:v0.0.3

Service

Review kubernetes/foodstore/values.yaml and run below command:

helm install --create-namespace --namespace foodstore foodstore kubernetes/foodstore

Above deployment is confugured for Traefik of https://github.com/pgillich/kind-on-dev, so the service can be accessed with http://foodstore.kind-01.company.com, for example:

curl http://foodstore.kind-01.company.com/v1/tags

Usage

The API is specified in api/foodstore.yaml, in OpenAPI 2.0. It can be seen in browser at http://localhost:8088/docs, after running below command:

make openapi-view

Examples, getting info

The /v1/livez endpoint is used by Kubernetes.

The /v1/version returns build information, for example:

curl 127.0.0.1:8080/v1/version
{"appName":"meals-demo","buildTime":"2022-02-06T14:19:15+0100","goMod":"module github.com/pgillich/meals-demo\n\ngo 1.17\n\nrequire (\n\tgithub.com/go-openapi/errors v0.20.1\n\tgithub.com/go-openapi/loads v0.21.1\n\tgithub.com/go-openapi/runtime v0.23.0\n\tgithub.com/go-openapi/spec v0.20.4\n\tgithub.com/go-openapi/strfmt v0.21.0\n\tgithub.com/go-openapi/swag v0.19.15\n\tgithub.com/go-openapi/validate v0.20.3\n\tgithub.com/jessevdk/go-flags v1.5.0\n\tgithub.com/stretchr/testify v1.7.0\n\tgolang.org/x/net v0.0.0-20210421230115-4e50805a0758\n)\n\nrequire (\n\temperror.dev/errors v0.8.0 // indirect\n\tgithub.com/PuerkitoBio/purell v1.1.1 // indirect\n\tgithub.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect\n\tgithub.com/asaskevich/govalidator v0.0.0-20200907205600-7a23bdc65eef // indirect\n\tgithub.com/davecgh/go-spew v1.1.1 // indirect\n\tgithub.com/docker/go-units v0.4.0 // indirect\n\tgithub.com/go-openapi/analysis v0.21.2 // indirect\n\tgithub.com/go-openapi/jsonpointer v0.19.5 // indirect\n\tgithub.com/go-openapi/jsonreference v0.19.6 // indirect\n\tgithub.com/go-stack/stack v1.8.0 // indirect\n\tgithub.com/jinzhu/gorm v1.9.16 // indirect\n\tgithub.com/jinzhu/inflection v1.0.0 // indirect\n\tgithub.com/josharian/intern v1.0.0 // indirect\n\tgithub.com/lib/pq v1.1.1 // indirect\n\tgithub.com/mailru/easyjson v0.7.6 // indirect\n\tgithub.com/mattn/go-sqlite3 v1.14.0 // indirect\n\tgithub.com/mitchellh/mapstructure v1.4.1 // indirect\n\tgithub.com/oklog/ulid v1.3.1 // indirect\n\tgithub.com/pkg/errors v0.9.1 // indirect\n\tgithub.com/pmezard/go-difflib v1.0.0 // indirect\n\tgo.mongodb.org/mongo-driver v1.7.3 // indirect\n\tgo.uber.org/atomic v1.7.0 // indirect\n\tgo.uber.org/multierr v1.6.0 // indirect\n\tgolang.org/x/sys v0.0.0-20210420072515-93ed5bcd2bfe // indirect\n\tgolang.org/x/text v0.3.7 // indirect\n\tgopkg.in/yaml.v2 v2.4.0 // indirect\n\tgopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect\n)\n","version":"v0.0.2-1-g8cb47e5"}

Examples, listing all records

Geting all records:

curl 127.0.0.1:8080/v1/tags
[{"id":3,"name":"gluten free"},{"id":1,"name":"spicy"},{"id":2,"name":"vegan"}]

curl 127.0.0.1:8080/v1/ingredients
[{"description":"Tomato","id":6,"name":"tomato"},{"description":"Onion","id":7,"name":"onion"},{"description":"Tomato sauce","id":1,"name":"tomato sauce"},{"description":"Bacon","id":3,"name":"bacon"},{"description":"Salami","id":4,"name":"salami"},{"description":"Sour cream sauce","id":2,"name":"sour cream sauce"},{"description":"Mozzarella","id":5,"name":"mozzarella"}]

curl 127.0.0.1:8080/v1/meal/findByTag
[{"description":"Spicy pizza","id":1,"ingredients":[{"description":"Tomato sauce","id":1,"name":"tomato sauce"},{"description":"Bacon","id":3,"name":"bacon"},{"description":"Salami","id":4,"name":"salami"}],"kcal":123,"name":"Spicy","pictureUrl":"http://a.com","price":3.25,"tags":[{"id":1,"name":"spicy"}]},{"description":"Vegan pizza","id":2,"ingredients":[{"description":"Sour cream sauce","id":2,"name":"sour cream sauce"},{"description":"Mozzarella","id":5,"name":"mozzarella"}],"kcal":234,"name":"Vegan","pictureUrl":"http://a.com","price":4.1,"tags":[{"id":2,"name":"vegan"}]}]

Examples, filtering meals

Getting meals filtered by tag ID:

curl 127.0.0.1:8080/v1/meal/findByTag?tag=1
[{"description":"Spicy pizza","id":1,"ingredients":[{"description":"Tomato sauce","id":1,"name":"tomato sauce"},{"description":"Bacon","id":3,"name":"bacon"},{"description":"Salami","id":4,"name":"salami"}],"kcal":123,"name":"Spicy","pictureUrl":"http://a.com","price":3.25,"tags":[{"id":1,"name":"spicy"}]}]

Getting only one meal by ID:

curl 127.0.0.1:8080/v1/meal/1
{"description":"Spicy pizza","id":1,"ingredients":[{"description":"Tomato sauce","id":1,"name":"tomato sauce"},{"description":"Bacon","id":3,"name":"bacon"},{"description":"Salami","id":4,"name":"salami"}],"kcal":123,"name":"Spicy","pictureUrl":"http://a.com","price":3.25,"tags":[{"id":1,"name":"spicy"}]}

Examples, changing data

Creating a new meal (the ID at the end of path is needed, but skipped):

curl -X POST -H 'Content-Type: application/json' 127.0.0.1:8080/v1/meal/0 -d '{"description":"Tomato pizza","ingredients":[{"description":"Tomato sauce","id":1,"name":"tomato sauce"}],"kcal":200,"name":"Spicy","pictureUrl":"http://c.com","price":3.25,"tags":[{"id":3,"name":"gluten free"}]}'

Updating a meal (the ID at the end of path is needed, but skipped):

curl -X PUT -H 'Content-Type: application/json' 127.0.0.1:8080/v1/meal/0 -d '{"description":"Tomato pizza","id":5,"ingredients":[{"description":"Tomato sauce","id":1,"name":"tomato sauce"}],"kcal":200,"name":"Spicy","pictureUrl":"http://c.com","price":3.55,"tags":[{"id":3,"name":"gluten free"}]}'

Deleting a meal:

curl -X DELETE 127.0.0.1:8080/v1/meal/5

Development

Prerequisites

• Ubuntu
• Docker
• git
• make
• Golang compiler, linters, etc. are not needed (they are run in container)

Building

Builds exacutable binary to build/bin/.

make build

Image making

Below command makes Docker image:

make image

Checks

Includes belows:

• make test:go test
• make lint: https://github.com/golangci/golangci-lint
• make shellcheck: https://github.com/koalaman/shellcheck
• make mdlint: https://github.com/DavidAnson/markdownlint-cli2

make check

OpenAPI sleketons

Go source code generating can be executed by below command:

make openapi-server