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Feature for probing functions

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Introduces a single-flight call to a function's health
endpoint to verify that it is registered with an Istio
sidecar (Envoy) before letting the invocation through.

Results are cached for 5 seconds, before a probe is
required again.

Tested without Istio, with probe_functions environment
variable set to true, I saw a probe execute in the logs.

Fixes: #1721 for Istio users.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>
This commit is contained in:
Alex Ellis (OpenFaaS Ltd)
2022-06-29 10:09:01 +01:00
committed by Alex Ellis
parent 01841f605c
commit 88eea5f62e
43 changed files with 784 additions and 468 deletions
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3
gateway/vendor/github.com/gorilla/mux/go.mod generated vendored
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module github.com/gorilla/mux
go 1.12