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Add Concurrency Limiter

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This enables limiting concurrency. It is a naive approach which
will reject requests as soon as they exceed the maximum number
of in-flight requests.

It is a port of the following PR from the new watchdog code:
https://github.com/openfaas-incubator/of-watchdog/pull/54

Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>
This commit is contained in:
Sargun Dhillon
2019-04-08 23:51:38 -07:00
committed by Alex Ellis
parent 45cf4db4cb
commit b019f6ca54
7 changed files with 112 additions and 4 deletions
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7
watchdog/readconfig.go
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@ -92,6 +92,7 @@ func (ReadConfig) Read(hasEnv HasEnv) WatchdogConfig {
}
cfg.metricsPort = 8081
cfg.maxInflight = parseIntValue(hasEnv.Getenv("max_inflight"), 0)
return cfg
}
@ -137,4 +138,10 @@ type WatchdogConfig struct {
// metricsPort is the HTTP port to serve metrics on
metricsPort int
// maxInflight limits the number of simultaneous
// requests that the watchdog allows concurrently.
// Any request which exceeds this limit will
// have an immediate response of 429.
maxInflight int
}