We now have two write interceptors, with one moved into
faas-provider. This commit makes the gateway use the new
external package and deletes its own.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>

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>

Uses the sync package from the unofficial Go library instead
of simpler solution.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>

update docker/distribution lib

Signed-off-by: Hilário Coelho <hilario.coelho@securityside.com>

* Add service target metric
* Add service min replicas metric
* Add scale type metric

These combined allow new auto-scaling modes and parameters
for OpenFaaS Pro customers.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

The queue type now resides in the provider, so that there is
no risk of a circular reference.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

For compatibility with newer NATS streaming version

https://github.com/openfaas/faas-netes/pull/819



Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Includes CreatedAt

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

This commits updates version endpoint to use ProviderInfo and VersionInfo structs from
faas-provider.GatewayInfo now uses ProviderInfo and VersionInfo structs. GatewayInfo is
left within gateway. Consumer of this endpoint should use typed struct GatewayInfo to
parse response.

Signed-off-by: Vivek Singh <vivekkmr45@yahoo.in>

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>