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Ensure valid metric names and change statsd metric escaping.

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This commit is contained in:
Julius Volz 2013-07-12 14:27:51 +02:00
parent eff54bdcf9
commit 728bdc52ae
3 changed files with 26 additions and 5 deletions
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16
bridge.go
View file

@ -10,12 +10,17 @@ import (
"fmt" "fmt"
"log" "log"
"net" "net"
"regexp"
"strconv" "strconv"
"strings" "strings"
"github.com/prometheus/client_golang/prometheus" "github.com/prometheus/client_golang/prometheus"
) )
var (
illegalCharsRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
)
type CounterContainer struct { type CounterContainer struct {
Elements map[string]prometheus.Counter Elements map[string]prometheus.Counter
} }
@ -121,10 +126,13 @@ type Bridge struct {
} }
func escapeMetricName(metricName string) string { func escapeMetricName(metricName string) string {
// TODO: evaluate what kind of escaping we really want. // If a metric starts with a digit, prepend an underscore.
metricName = strings.Replace(metricName, "_", "__", -1) if metricName[0] >= '0' && metricName[0] <= '9' {
metricName = strings.Replace(metricName, "-", "__", -1) metricName = "_" + metricName
metricName = strings.Replace(metricName, ".", "_", -1) }
// Replace all illegal metric chars with underscores.
metricName = illegalCharsRE.ReplaceAllString(metricName, "_")
return metricName return metricName
} }

7
mapper.go
View file

@ -20,6 +20,7 @@ var (
identifierRE = `[a-zA-Z_][a-zA-Z0-9_]+` identifierRE = `[a-zA-Z_][a-zA-Z0-9_]+`
metricLineRE = regexp.MustCompile(`^(\*\.|` + identifierRE + `\.)+(\*|` + identifierRE + `)$`) metricLineRE = regexp.MustCompile(`^(\*\.|` + identifierRE + `\.)+(\*|` + identifierRE + `)$`)
labelLineRE = regexp.MustCompile(`^(` + identifierRE + `)\s*=\s*"(.*)"$`) labelLineRE = regexp.MustCompile(`^(` + identifierRE + `)\s*=\s*"(.*)"$`)
metricNameRE = regexp.MustCompile(`^` + identifierRE + `$`)
) )
type metricMapping struct { type metricMapping struct {
@ -85,7 +86,11 @@ func (m *metricMapper) initFromString(fileContents string) error {
if len(matches) != 3 { if len(matches) != 3 {
return fmt.Errorf("Line %d: expected label mapping line, got: %s", i, line) return fmt.Errorf("Line %d: expected label mapping line, got: %s", i, line)
} }
currentMapping.labels[matches[1]] = matches[2] label, value := matches[1], matches[2]
if label == "name" && !metricNameRE.MatchString(value) {
return fmt.Errorf("Line %d: metric name '%s' doesn't match regex '%s'", i, value, metricNameRE)
}
currentMapping.labels[label] = value
default: default:
panic("illegal state") panic("illegal state")
} }

8
mapper_test.go
View file

@ -69,6 +69,14 @@ func TestMetricMapper(t *testing.T) {
`, `,
configBad: true, configBad: true,
}, },
// Config with bad metric name.
{
config: `
test.*.*
name="0foo"
`,
configBad: true,
},
} }
mapper := metricMapper{} mapper := metricMapper{}