yosoy is a HTTP service for stubbing and prototyping distributed applications. It is a service which will introduce itself to the caller and print some useful information about its environment. "Yo soy" in español means "I am".
yosoy is extremely useful when creating a distributed application stub and you need to see more meaningful responses than a default nginx welcome page.
Typical use cases include:
- testing HTTP routing & ingress
- testing HTTP load balancing
- testing HTTP caching
- stubbing and prototyping distributed applications
yosoy responds to all requests with a JSON containing the information about:
- HTTP request:
- Host
- Request URI
- Method
- Scheme
- Proto
- URL
- Remote IP
- HTTP headers
- HTTP proxy headers
- host:
- Hostname
- How many times it was called
- Env variables if
YOSOY_SHOW_ENVS
is set totrue
,yes
,on
, or1
- Files' contents if
YOSOY_SHOW_FILES
is set to a comma-separated list of (valid) files
Checkout out Sample JSON response below to see how useful yosoy is when troubleshooting/stubbing/prototyping distributed applications.
The docker image is available on docker hub:
docker pull lukasz/yosoy
and ghcr.io:
docker pull ghcr.io/lukaszbudnik/yosoy
It exposes HTTP service on port 80.
There is a sample Kubernetes deployment file in the test
folder. It uses both YOSOY_SHOW_ENVS
and YOSOY_SHOW_FILES
. The deployment uses Kubernetes Downward API to expose labels and annotations as volume files which are then returned by yosoy.
Deploy it to minikube and execute curl to the service a couple of times:
# start minikube
minikube start
# deploy test service
kubectl apply -f test/deployment.yaml
# tunnel to it and copy the URL as $URL variable
minikube service --url camarero
# simulate some HTTP requests
curl -H "Host: gateway.myapp.com" $URL/camarero/abc
curl -H "Host: gateway.myapp.com" $URL/camarero/abc
curl -H "Host: gateway.myapp.com" $URL/camarero/abc
curl -H "Host: gateway.myapp.com" $URL/camarero/abc
A sample yosoy JSON response to a request made from a single page application (SPA) to a backend API deployed in Kubernetes behind nginx ingress and haproxy-auth-gateway looks like this:
{
"host": "api.localtest.me",
"proto": "HTTP/1.1",
"method": "GET",
"scheme": "https",
"requestUri": "/camarero",
"url": "https:///camarero",
"remoteAddr": "192.168.65.3",
"counter": 1,
"headers": {
"Accept": ["*/*"],
"Accept-Encoding": ["gzip, deflate, br"],
"Accept-Language": ["en-US,en;q=0.9,pl-PL;q=0.8,pl;q=0.7,es;q=0.6"],
"Authorization": [
"Bearer eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJXejFuaDNCWDI4UHMxVEMzSDRoOW52Q1VWRXpjVVBzQms4Z1NmeEp4ZS1JIn0.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.t5y3L4FzGxM0zwI3fskDI8Kemxz_izcvPPKciSEvNHnZWGQK-9AclGNFz_A9cLFSkpc6l6lBmt7WaC0i04c4h1a9G9AOFImmVXPMPDdTXOQ4aah4CvlN6Fy8ShvSHrQA-wMHEELBpIFsKFx2WP3QHiy27ycr3kqQzW4QymyU7J8tM4-qKR_H1_8aiNOrm5fIED-nEP096V2zvWXiGZX7ts6XE2-annhKphCABLdmIiwgDUnhlAz0hdiDrDbIjzr0ldW4AnUkSQxIZY0PnoEnGVuUvkOYvJpFx10gjORMnRgHSEj9Mk5dtyVGHcihZ5TntCL40WoymNxae6K4-FH3Lw"
],
"Origin": ["https://lukaszbudnik.github.io"],
"Referer": ["https://lukaszbudnik.github.io/"],
"Sec-Ch-Ua": [
"\" Not;A Brand\";v=\"99\", \"Google Chrome\";v=\"91\", \"Chromium\";v=\"91\""
],
"Sec-Ch-Ua-Mobile": ["?0"],
"Sec-Fetch-Dest": ["empty"],
"Sec-Fetch-Mode": ["cors"],
"Sec-Fetch-Site": ["cross-site"],
"User-Agent": [
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36"
],
"X-Forwarded-For": ["192.168.65.3", "10.1.3.9"],
"X-Forwarded-Host": ["api.localtest.me"],
"X-Forwarded-Port": ["443"],
"X-Forwarded-Proto": ["https"],
"X-Real-Ip": ["192.168.65.3"],
"X-Request-Id": ["48a77564d88ca8a893610b9458bfd885"],
"X-Scheme": ["https"]
},
"hostname": "camarero-cf7c95ccd-cz5lh",
"envVariables": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"HOSTNAME=camarero-cf7c95ccd-cz5lh",
"YOSOY_SHOW_FILES=/etc/podinfo/labels,/etc/podinfo/annotations",
"YOSOY_SHOW_ENVS=true",
"KUBERNETES_SERVICE_PORT=443",
"KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443",
"KUBERNETES_PORT=tcp://10.96.0.1:443",
"KUBERNETES_PORT_443_TCP_PORT=443",
"KUBERNETES_SERVICE_HOST=10.96.0.1",
"KUBERNETES_PORT_443_TCP_PROTO=tcp",
"KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1",
"HOME=/root"
],
"files": {
"/etc/podinfo/annotations": "kubernetes.io/config.seen=\"2021-08-24T15:12:19.555374430Z\"\nkubernetes.io/config.source=\"api\"",
"/etc/podinfo/labels": "app.kubernetes.io/component=\"api\"\napp.kubernetes.io/name=\"camarero\"\napp.kubernetes.io/part-of=\"hotel\"\napp.kubernetes.io/version=\"0.0.1\"\npod-template-hash=\"cf7c95ccd\""
}
}