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Use regexp.Compile to avoid performance problems

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Signed-off-by: Lucas Thiesen <lucas.thiesen@zalando.de>
This commit is contained in:
Lucas Thiesen 2023-05-04 16:59:00 +02:00
parent 2f5d3f5a42
commit f28653de74
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GPG Key ID: 872C49663C2D93E5
1 changed files with 8 additions and 6 deletions
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14
pkg/collector/hostname_collector.go
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@ -30,7 +30,7 @@ func NewHostnameCollectorPlugin(
metricName string,
) (*HostnameCollectorPlugin, error) {
if metricName == "" {
return nil, fmt.Errorf("failed to initialize hostname collector plugin, metric name was not defined")
return nil, fmt.Errorf("Failed to initialize hostname collector plugin, metric name was not defined")
}
return &HostnameCollectorPlugin{
@ -52,15 +52,17 @@ func (p *HostnameCollectorPlugin) NewCollector(
// RPS data from a specific hostname from prometheus. The idea
// of the copy is to not modify the original config struct.
confCopy := *config
//hostnames := config.Config["hostnames"]
//weights := config.Config["weights"]
if _, ok := config.Config["hostnames"]; !ok {
return nil, fmt.Errorf("hostname is not specified, unable to create collector")
return nil, fmt.Errorf("Hostname is not specified, unable to create collector")
}
regex, err := regexp.Compile("^[a-zA-Z0-9.-]+$")
if err != nil {
return nil, fmt.Errorf("Failed to create regular expression to match hostname format")
}
hostnames := strings.Split(config.Config["hostnames"], ",")
for _, h := range hostnames {
if ok, err := regexp.MatchString("^[a-zA-Z0-9.-]+$", h); !ok || err != nil {
if ok := regex.MatchString(h); !ok {
return nil, fmt.Errorf(
"Invalid hostname format, unable to create collector: %s",
h,
@ -105,7 +107,7 @@ func (c *HostnameCollector) GetMetrics() ([]CollectedMetric, error) {
}
if len(v) != 1 {
return nil, fmt.Errorf("expected to only get one metric value, got %d", len(v))
return nil, fmt.Errorf("Expected to only get one metric value, got %d", len(v))
}
return v, nil
}