Gateway using Default Http Pattern

This recipe is a gateway using the defult http pattern which uses JWT, Rate Limiter, and Circuit Breaker.

Circuit Breaker Service:

Name	Type	Description
mode	string	The tripping mode: 'a' for contiguous errors, 'b' for errors within a time period, 'c' for contiguous errors within a time period, and 'd' for a probabilistic smart circuit breaker mode. Defaults to mode 'a'
threshold	number	The number of errors required for tripping
period	number	Number of seconds in which errors have to occur for the circuit breaker to trip. Applies to modes 'b' and 'c'
timeout	number	Number of seconds that the circuit breaker will remain tripped. Applies to modes 'a', 'b', 'c'

Rate Limiter

Name	Type	Description
limit	string	Limit can be specifed in the format of "limit-period". Valid periods are 'S', 'M' & 'H' to represent Second, Minute & Hour. Example: "10-S" represents 10 request/second

JWT

Name	Type	Description
token	string	The raw token
key	string	The key used to sign the token
signingMethod	string	The signing method used (HMAC, ECDSA, RSA, RSAPSS)
issuer	string	The 'iss' standard claim to match against
subject	string	The 'sub' standard claim to match against
audience	string	The 'aud' standard claim to match against

Installation

• Install Go
• Install the flogo cli

Setup

git clone https://github.com/project-flogo/microgateway
cd microgateway/examples/json/default-http-pattern

Testing

Create the gateway:

flogo create -f flogo.json
cd MyProxy
flogo install github.com/project-flogo/contrib/activity/rest
flogo install github.com/project-flogo/microgateway/activity/circuitbreaker
flogo install github.com/project-flogo/microgateway/activity/jwt
flogo install github.com/project-flogo/microgateway/activity/ratelimiter
flogo build

Start the gateway:

bin/MyProxy

and test below scenario.

In another terminal start the server:

go run main.go -server

Request is successful

Run the following command:

curl --request GET http://localhost:9096/endpoint -H "Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJNYXNobGluZyIsImlhdCI6MTU0NDEzMTYxOCwiZXhwIjoxNTc1NjY3NjE4LCJhdWQiOiJ3d3cubWFzaGxpbmcuaW8iLCJzdWIiOiJ0ZW1wdXNlckBtYWlsLmNvbSJ9.wgunWSIJqieRKsmObATT2VEHMMzkKte6amuUlhc1oKs"

You should see:

{"category":{"id":0,"name":"string"},"id":1,"name":"sally","photoUrls":["string"],"status":"available","tags":[{"id":0,"name":"string"}]}

JWT token is invalid

Run the following command:

curl --request GET http://localhost:9096/endpoint -H "Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJNYXNobGluZyIsImlhdCI6MTU0NDEzMTYxOCwiZXhwIjoxNTc1NjY3NjE4LCJhdWQiOiJ3d3cubWFzaGxpbmcuaW8iLCJzdWIiOiJ0ZW1wdXNlckBtYWlsLmNvbSJ9.wgunWSIJqieRKsmObATT2VEHMMzkKte6amuUlhc1oK"

You should see:

{"errorMessage":"","validationMessage":"signature is invalid"}

Rate limit is exceeded

Run the following command faster the 1 per second:

curl --request GET http://localhost:9096/endpoint -H "Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJNYXNobGluZyIsImlhdCI6MTU0NDEzMTYxOCwiZXhwIjoxNTc1NjY3NjE4LCJhdWQiOiJ3d3cubWFzaGxpbmcuaW8iLCJzdWIiOiJ0ZW1wdXNlckBtYWlsLmNvbSJ9.wgunWSIJqieRKsmObATT2VEHMMzkKte6amuUlhc1oKs"

You should see:

{"status":"Rate Limit Exceeded - The service you have requested is over the allowed limit."}

Circuit breaker tripped

Stop the server and run the following command 6 times:

curl --request GET http://localhost:9096/endpoint -H "Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJNYXNobGluZyIsImlhdCI6MTU0NDEzMTYxOCwiZXhwIjoxNTc1NjY3NjE4LCJhdWQiOiJ3d3cubWFzaGxpbmcuaW8iLCJzdWIiOiJ0ZW1wdXNlckBtYWlsLmNvbSJ9.wgunWSIJqieRKsmObATT2VEHMMzkKte6amuUlhc1oKs"

You should see:

{"error":"circuit breaker tripped"}