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authorAditya Rajan <arajan@redhat.com>2021-11-15 16:47:08 +0530
committerAditya Rajan <arajan@redhat.com>2021-11-15 17:49:54 +0530
commitc050f05ccff6416ccd41d271f0051b395cbe5a1f (patch)
treee0f22c476ab3939015321b338145768c53ba89f4 /pkg
parentcca6df428cb9ce187ae1341740ac1137c7a67a75 (diff)
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filter: add basic pattern matching for label keys
Following PR adds basic pattern matching to filter by labels for `keys`. Adds support for use-cases like `--filter label=some.prefix.com/key/*` where end-users want to match a pattern for keys as compared to exact value. Signed-off-by: Aditya Rajan <arajan@redhat.com>
Diffstat (limited to 'pkg')
-rw-r--r--pkg/util/filters.go25
1 files changed, 24 insertions, 1 deletions
diff --git a/pkg/util/filters.go b/pkg/util/filters.go
index e252c1ddf..5af868873 100644
--- a/pkg/util/filters.go
+++ b/pkg/util/filters.go
@@ -4,6 +4,7 @@ import (
"encoding/json"
"fmt"
"net/http"
+ "regexp"
"strings"
"time"
@@ -94,6 +95,28 @@ func PrepareFilters(r *http.Request) (*map[string][]string, error) {
return &filterMap, nil
}
+func wildCardToRegexp(pattern string) string {
+ var result strings.Builder
+ for i, literal := range strings.Split(pattern, "*") {
+ // Replace * with .*
+ if i > 0 {
+ result.WriteString(".*")
+ }
+ // Quote any regular expression meta characters in the
+ // literal text.
+ result.WriteString(regexp.QuoteMeta(literal))
+ }
+ return result.String()
+}
+
+func matchPattern(pattern string, value string) bool {
+ if strings.Contains(pattern, "*") {
+ result, _ := regexp.MatchString(wildCardToRegexp(pattern), value)
+ return result
+ }
+ return false
+}
+
// MatchLabelFilters matches labels and returns true if they are valid
func MatchLabelFilters(filterValues []string, labels map[string]string) bool {
outer:
@@ -106,7 +129,7 @@ outer:
filterValue = ""
}
for labelKey, labelValue := range labels {
- if labelKey == filterKey && (filterValue == "" || labelValue == filterValue) {
+ if ((labelKey == filterKey) || matchPattern(filterKey, labelKey)) && (filterValue == "" || labelValue == filterValue) {
continue outer
}
}