Cloud Native Catalog

wasm filter

HTTP Auth

FILTER001

wasm filter

Related Patterns

wasm filter

Metrics Store

FILTER005

HTTP Auth

What this fiter does

Simulates handling authentication of requests at proxy level. Requests with a header `token` with value `hello` are accepted as authorized while the rest unauthorized. The actual authentication is handled by the Upstream server. Whenever the proxy recieves a request it extracts the `token` header and makes a request to the Upstream server which validates the token and returns a response.

Build and deploy:


cd http-auth
make run-filtered

Test:


curl  -H "token":"hello" 0.0.0.0:18000 -v # Authorized
curl  -H "token":"world" 0.0.0.0:18000 -v # Unauthorized

Caveats and Considerations

Compatibility

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wasm filter

Metrics Store

FILTER005

wasm filter

Related Patterns

wasm filter

HTTP Auth

FILTER001

Metrics Store

What this fiter does

This example showcases communication between a WASM filter and a service via shared queue. It combines the Singleton HTTP Call and TCP Metrics examples. The filter collects metrics and enqueues it onto the queue while the service dequeues it and sends it to upstream server where it is stored.

Build and Deploy:


cd metrics-store
make run-filtered

Test this filer by executing:


# make a few of these calls
curl 0.0.0.0:18000 -v -d "request body"


# Retrieves the stored stats
curl 0.0.0.0:8080/retrieve -v 
x | y | z  === 
# x : downstream bytes, 
# y : upstream bytes, 
# z: the latency for application server to respond

Collects simple metrics for every TCP packet sent, and logs it down.

Caveats and Considerations

Potentially log large files depending upon volue of traffic handled.

Compatibility

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wasm filter

Singleton HTTP Call

FILTER004

wasm filter

Related Patterns

wasm filter

HTTP Auth

FILTER001

Singleton HTTP Call

What this fiter does

The filter is responsible for intercepting HTTP requests, authorizing them based on the stored cache, and performing rate limiting. In the context of the envoy, this component is an HTTP filter and gets executed in the worker threads. For each request, a context object gets created.

Caveats and Considerations

Compatibility

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wasm filter

Singleton Queue

FILTER006

wasm filter

Related Patterns

wasm filter

HTTP Auth

FILTER001

Singleton Queue

What this fiter does

An example which depicts a singleton HTTP WASM service which does an HTTP call once every 2 seconds. Build and deploy:


cd singleton-http-call
make run-filtered

Caveats and Considerations

Compatibility

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wasm filter

TCP Metrics

FILTER002

wasm filter

Related Patterns

wasm filter

HTTP Auth

FILTER001

TCP Metrics

What this fiter does

Collects simple metrics for every TCP packet and logs it.

Build and Deploy:


cd tcp-metrics
make run-filtered

Test this filer by executing:


curl 0.0.0.0:18000 -v -d "request body"

Caveats and Considerations

none

Compatibility

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wasm filter

TCP Packet Parse

FILTER003

wasm filter

Related Patterns

wasm filter

HTTP Auth

FILTER001

TCP Packet Parse

What this fiter does

Parses the contents of every TCP packet the proxy receives and logs it.

Build and deploy:


cd tcp-packet-parse
make run-filtered

Test this filter by executing:


curl 0.0.0.0:18000 -v -d "request body"

Caveats and Considerations

Compatibility

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Cloud Native Catalog

Meshery UI

Meshery CLI

HTTP Auth

FILTER001

wasm filter

Related Patterns

Metrics Store

FILTER005

HTTP Auth

What this fiter does

Caveats and Considerations

Compatibility

Metrics Store

FILTER005

wasm filter

Related Patterns

HTTP Auth

FILTER001

Metrics Store

What this fiter does

Caveats and Considerations

Compatibility

Singleton HTTP Call

FILTER004

wasm filter

Related Patterns

HTTP Auth

FILTER001

Singleton HTTP Call

What this fiter does

Caveats and Considerations

Compatibility

Singleton Queue

FILTER006

wasm filter

Related Patterns

HTTP Auth

FILTER001

Singleton Queue

What this fiter does

Caveats and Considerations

Compatibility

TCP Metrics

FILTER002

wasm filter

Related Patterns

HTTP Auth

FILTER001

TCP Metrics

What this fiter does

Caveats and Considerations

Compatibility

TCP Packet Parse

FILTER003

wasm filter

Related Patterns

HTTP Auth

FILTER001

TCP Packet Parse

What this fiter does

Caveats and Considerations

Compatibility