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kafka.go
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kafka.go
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package pubghealth
import (
"fmt"
"github.com/bsm/sarama-cluster"
"github.com/heptiolabs/healthcheck"
"github.com/pkg/errors"
"time"
)
// KafkaConnectionCheck verifies the client's connectivity to the Kafka cluster.
func KafkaConnectionCheck(client *cluster.Client, timeout time.Duration, frequency time.Duration) healthcheck.Check {
checkFunc := func() error {
brokers := (*client).Brokers()
if len(brokers) < 1 {
return errors.New("Kafka client is not connected to any brokers.")
}
for _, b := range brokers {
isConnected, err := b.Connected()
if err != nil {
// Error while trying to connect, wrap it.
return errors.Wrap(err, fmt.Sprintf("Kafka client is unable to connect to the broker at '%s'", b.Addr()))
}
if !isConnected {
// Not connected, no connection errors, report it.
return errors.Errorf("Kafka client is not connected to the broker at '%s'", b.Addr())
}
}
// S'all good!
return nil
}
return healthcheck.Timeout(healthcheck.Async(checkFunc, frequency), timeout)
}
// KafkaTopicsExist verifies that specific topics exist in the Kafka cluster.
func KafkaTopicsExist(client *cluster.Client, timeout time.Duration, frequency time.Duration, expected []string) healthcheck.Check {
checkFunc := func() error {
// Force a refresh of topics:
err := (*client).RefreshMetadata(expected...)
if err != nil {
return err
}
actual, err := (*client).Topics()
if err != nil {
return err
}
// Check that all expected topics are found in the list of actual topics.
for _, eT := range expected {
found := false
for _, aT := range actual {
if eT == aT {
found = true
break
}
}
if !found {
return errors.Errorf("Topic '%s' was not found in the Kafka cluster.", eT)
}
}
// S'all good!
return nil
}
return healthcheck.Timeout(healthcheck.Async(checkFunc, frequency), timeout)
}