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pattern.go
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pattern.go
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// Copyright © 2023 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package events
import (
"regexp"
"sort"
"strings"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
)
var (
errInvalidRegexp = errors.DefineInvalidArgument("invalid_regexp", "invalid regexp")
errNoMatchingEvents = errors.DefineInvalidArgument("no_matching_events", "no matching events for regexp `{regexp}`")
errUnknownEventName = errors.DefineInvalidArgument("unknown_event_name", "unknown event `{name}`")
)
// NamesFromPatterns returns the event names which match the given patterns.
// The defined names are a set of event names which are used to match the patterns.
func NamesFromPatterns(definedNames map[string]struct{}, patterns []string) ([]string, error) {
if len(patterns) == 0 {
return nil, nil
}
nameMap := make(map[string]struct{})
for _, name := range patterns {
if strings.HasPrefix(name, "/") && strings.HasSuffix(name, "/") {
re, err := regexp.Compile(strings.Trim(name, "/"))
if err != nil {
return nil, errInvalidRegexp.WithCause(err)
}
var found bool
for defined := range definedNames {
if re.MatchString(defined) {
nameMap[defined] = struct{}{}
found = true
}
}
if !found {
return nil, errNoMatchingEvents.WithAttributes("regexp", re.String())
}
} else {
var found bool
for defined := range definedNames {
if name == defined {
nameMap[name] = struct{}{}
found = true
break
}
}
if !found {
return nil, errUnknownEventName.WithAttributes("name", name)
}
}
}
if len(nameMap) == 0 {
return nil, nil
}
out := make([]string, 0, len(nameMap))
for name := range nameMap {
out = append(out, name)
}
sort.Strings(out)
return out, nil
}