Echo-Server / Docker / Kubernetes / Helm

July 16, 2022 · View on GitHub

Read the docs : https://ealenn.github.io/Echo-Server

An echo server is a server that replicates the request sent by the client and sends it back.

Available:

GET / POST / PUT / PATCH / DELETE
Request (Query, Body, IPs, Host, Urls...)
Request Headers / Response Headers
Environment variables
Control via Headers/Query
Folders and Files
Monitoring

docker

Echo-Server / Docker / Kubernetes / Helm
- Table of contents
- Configuration
- Use Echo-Server
  - Custom responses
    - Custom HTTP Status Code
    - Custom Body
    - Custom Body with Environment variable value
    - Custom Headers
    - Custom response latency
    - File/Folder explorer
    - Combine custom actions
- Change default Queries/Request commands
- Loggers
  - Format
  - Seq
  - ELK
- Setting up
  - Docker
  - Docker-Compose
  - Kubernetes
  - Kubernetes with Helm
  - NodeJS
- Contributing
- Versioning
- License
- Development
  - Documentation
  - Tests
  - Release notes
  - Update Helm Chart

Configuration

Environment	Helm	CLI	Default
PORT	service.port	--port	`80`
LOGS__IGNORE__PING	application.logs.ignore.ping	--logs:ignore:ping	`false`
ENABLE__HOST	application.enable.host	--enable:host	`true`
ENABLE__HTTP	application.enable.http	--enable:http	`true`
ENABLE__REQUEST	application.enable.request	--enable:request	`true`
ENABLE__COOKIES	application.enable.cookies	--enable:cookies	`true`
ENABLE__HEADER	application.enable.header	--enable:header	`true`
ENABLE__ENVIRONMENT	application.enable.environment	--enable:environment	`true`
ENABLE__FILE	application.enable.file	--enable:file	`true`

Use Echo-Server

curl

I use jq for nice curl results ;)

Custom responses

Query	Header	Content	Conditions
?echo_code=	X-ECHO-CODE	HTTP code `200`, `404`	200 <= `CODE` <= 599
		`404-401` or `200-500-301`
?echo_body=	X-ECHO-BODY	Body message
?echo_env_body=	X-ECHO-ENV-BODY	The key of environment variable	Enable environment `true`
?echo_header=	X-ECHO-HEADER	Response Header `Lang: en-US`	Enable header `true`
?echo_time=	X-ECHO-TIME	Wait time in `ms`	0 <= `TIME` <= 30.000
?echo_file=	X-ECHO-FILE	Path of Directory or File	Enable file `true`

Custom HTTP Status Code

➜ curl -I --header 'X-ECHO-CODE: 404' localhost:8080
➜ curl -I localhost:8080/?echo_code=404

HTTP/1.1 404 Not Found

➜ curl -I --header 'X-ECHO-CODE: 404-300' localhost:8080
➜ curl -I localhost:8080/?echo_code=404-300

HTTP/1.1 404 Not Found
HTTP/1.1 300 Multiple Choices

➜ for i in {1..10}
➜ do
➜    curl -I localhost:8080/?echo_code=200-400-500
➜ done

HTTP/1.1 500 Internal Server Error
HTTP/1.1 400 Bad Request
HTTP/1.1 200 OK
HTTP/1.1 500 Internal Server Error
HTTP/1.1 200 OK
HTTP/1.1 500 Internal Server Error

Custom Body

➜ curl --header 'X-ECHO-BODY: amazing' localhost:8080
➜ curl localhost:8080/?echo_body=amazing

"amazing"

Custom Body with Environment variable value

➜ curl --header 'X-ECHO-ENV-BODY: HOSTNAME' localhost:8080
➜ curl localhost:8080/?echo_env_body=HOSTNAME

"c53a9ed79fa2"

➜ for i in {1..10}
➜ do
➜    curl localhost:8080/?echo_env_body=HOSTNAME
➜ done

"c53a9ed79fa2"
"f10c3af61e40"
"c53a9ed79fa2"
"f10c3af61e40"
"c53a9ed79fa2"

Custom Headers

➜ curl --header 'X-ECHO-HEADER: One:1' localhost:8080
➜ curl localhost:8080/?echo_header=One:1

HTTP/1.1 200 OK
One: 1

➜ curl --header 'X-ECHO-HEADER: One:1, Two:2' localhost:8080
➜ curl "localhost:8080/?echo_header=One:1,%20Two:2"

HTTP/1.1 200 OK
One: 1
Two: 2

Custom response latency

➜ curl --header 'X-ECHO-TIME: 5000' localhost:8080
➜ curl "localhost:8080/?echo_time=5000"

⏳... 5000 ms

You can change default validations with

ENVIRONMENT	CLI	Default
CONTROLS__TIMES__MIN	--controls:times:min	`0`
CONTROLS__TIMES__MAX	--controls:times:max	`60000`

(Latency is defined in milliseconds)

File/Folder explorer

➜ curl --header 'X-ECHO-FILE: /' localhost:8080
➜ curl "localhost:8080/?echo_file=/"

["app", "bin", "etc", "usr", "var"]

Combine custom actions

➜ curl --header 'X-ECHO-CODE: 401' --header 'X-ECHO-BODY: Oups' localhost:8080
➜ curl "localhost:8080/?echo_body=Oups&echo_code=401"

HTTP/1.1 401 Unauthorized
"Oups"

Change default Queries/Request commands

Read the docs

Environment	CLI	Default
COMMANDS__HTTPBODY__QUERY	--commands:httpBody:query	`echo_body`
COMMANDS__HTTPBODY__HEADER	--commands:httpBody:header	`x-echo-body`
COMMANDS__HTTPENVBODY__QUERY	--commands:httpEnvBody:query	`echo_env_body`
COMMANDS__HTTPENVBODY__HEADER	--commands:httpEnvBody:header	`x-echo-env-body`
COMMANDS__HTTPCODE__QUERY	--commands:httpCode:query	`echo_code`
COMMANDS__HTTPCODE__HEADER	--commands:httpCode:header	`x-echo-code`
COMMANDS__HTTPHEADERS__QUERY	--commands:httpHeaders:query	`echo_header`
COMMANDS__HTTPHEADERS__HEADER	--commands:httpHeaders:header	`x-echo-header`
COMMANDS__TIME__QUERY	--commands:time:query	`echo_time`
COMMANDS__TIME__HEADER	--commands:time:header	`x-echo-time`
COMMANDS__FILE__QUERY	--commands:file:query	`echo_file`
COMMANDS__FILE__HEADER	--commands:file:header	`x-echo-file`

Loggers

Read the docs

Environment	CLI	Default
LOGS__APP	--logs:app	`echo-server`
LOGS__LEVEL	--logs:level	`debug`
LOGS__FORMAT	--logs:format	`default`

Format

LOG FORMAT	DESCRIPTION
default	Combine `line` & `object`
line	Simple `Fri, 22 Jan 2021 10:45:20 GMT
object	JSON `{ "host": {}, http: {}, request: {}}`

Seq

Full example - Documentation

Environment	CLI	Default
LOGS__SEQ__ENABLED	--logs:seq:enabled	`false`
LOGS__SEQ__SERVER	--logs:seq:server
LOGS__SEQ__KEY	--logs:seq:key
LOGS__SEQ__LEVEL	--logs:seq:level	`info`

ELK

Full example - Documentation

Setting up

Docker

Read the docs

docker run -p 8080:80 ealen/echo-server

Docker-Compose

Read the docs

Sample

version: "3"
services:
  echo-server:
    image: ealen/echo-server
    ports:
      - 8080:80

With Seq

version: "3"
services:
  echo:
    image: ealen/echo-server
    environment: 
      PORT: 80
      LOGS__SEQ__ENABLED: "true"
      LOGS__SEQ__SERVER: "http://seq:5341"
    ports: 
      - 8080:80

  seq:
    image: datalust/seq
    environment: 
      ACCEPT_EULA: "Y"
    ports:
      - 3010:80

Kubernetes

Read the docs

curl -sL https://raw.githubusercontent.com/Ealenn/Echo-Server/master/docs/examples/echo.kube.yaml | kubectl apply -f -

Kubernetes with Helm

Read the docs - Artifact Hub

helm repo add ealenn https://ealenn.github.io/charts
helm repo update
helm install --set ingress.enable=true --name echoserver ealenn/echo-server

NodeJS

Read the docs

# Dependencies
npm ci
# Run with node
node ./src/webserver --port 8080
# Run with npm script
PORT=8080 npm run start

Contributing

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.

Versioning

We use SemVer for versioning. For the versions available, see the tags on this repository.

License

This project is licensed under the GNU Lesser General Public License - see the LICENSE.txt file for details.

Development

Documentation

Docker-Compose is available on ./docs folder.

docker compose up -d

The documentation is here localhost:4000

Tests

npm ci
# Without code coverage
npm run test
# With code coverage
npm run test-with-coverage

Release notes

git log --pretty=oneline

Update Helm Chart

=> https://github.com/Ealenn/charts/tree/master/charts/echo-server

Table of contents

Configuration

Use Echo-Server

Custom responses

Custom HTTP Status Code

Custom Body

Custom Body with Environment variable value

Custom Headers

Custom response latency

File/Folder explorer

Combine custom actions

Change default Queries/Request commands

Loggers

Format

Seq

ELK

Setting up

Docker

Docker-Compose

Kubernetes

Kubernetes with Helm

NodeJS

Contributing

Versioning

License

Development

Documentation

Tests

Release notes

Update Helm Chart