From c050f05ccff6416ccd41d271f0051b395cbe5a1f Mon Sep 17 00:00:00 2001 From: Aditya Rajan Date: Mon, 15 Nov 2021 16:47:08 +0530 Subject: 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 --- pkg/util/filters.go | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) (limited to 'pkg/util') 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 } } -- cgit v1.2.3-54-g00ecf