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source_format.go
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source_format.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package sumologicexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/sumologicexporter"
import (
"fmt"
"regexp"
)
type sourceFormats struct {
name sourceFormat
host sourceFormat
category sourceFormat
}
type sourceFormat struct {
matches []string
template string
}
const sourceRegex = `\%\{([\w\.]+)\}`
// newSourceFormat builds sourceFormat basing on the regex and given text.
// Regex is basing on the `sourceRegex` const
// For given example text: `%{cluster}/%{namespace}“, it sets:
// - template to `%s/%s`, which can be used later by fmt.Sprintf
// - matches as map of (attribute) keys ({"cluster", "namespace"}) which will
// be used to put corresponding value into templates' `%s
func newSourceFormat(r *regexp.Regexp, text string) sourceFormat {
matches := r.FindAllStringSubmatch(text, -1)
template := r.ReplaceAllString(text, "%s")
m := make([]string, len(matches))
for i, match := range matches {
m[i] = match[1]
}
return sourceFormat{
matches: m,
template: template,
}
}
// newSourceFormats returns sourceFormats for name, host and category based on cfg
func newSourceFormats(cfg *Config) sourceFormats {
r := regexp.MustCompile(sourceRegex)
return sourceFormats{
category: newSourceFormat(r, cfg.SourceCategory),
host: newSourceFormat(r, cfg.SourceHost),
name: newSourceFormat(r, cfg.SourceName),
}
}
// format converts sourceFormat to string.
// Takes fields and put into template (%s placeholders) in order defined by matches
func (s *sourceFormat) format(f fields) string {
labels := make([]interface{}, 0, len(s.matches))
for _, matchset := range s.matches {
v, ok := f.orig.Get(matchset)
if ok {
labels = append(labels, v.AsString())
} else {
labels = append(labels, "")
}
}
return fmt.Sprintf(s.template, labels...)
}
// isSet returns true if template is non-empty
func (s *sourceFormat) isSet() bool {
return len(s.template) > 0
}