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88eea5f62e
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>
26 lines
400 B
Go
26 lines
400 B
Go
package types
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import (
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"log"
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"time"
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)
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type routine func(attempt int) error
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func Retry(r routine, label string, attempts int, interval time.Duration) error {
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var err error
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for i := 0; i < attempts; i++ {
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res := r(i)
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if res != nil {
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err = res
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log.Printf("[%s]: %d/%d, error: %s\n", label, i, attempts, res)
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} else {
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err = nil
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break
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}
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time.Sleep(interval)
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}
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return err
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}
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