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Merge pull request #458 from najeal/najeal-228-vm-filtering
Added: vm filtering
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| package filter | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
| "text/template" | ||
|
|
||
| api "github.com/weaveworks/ignite/pkg/apis/ignite" | ||
| ) | ||
|
|
||
| const ( | ||
| filterSeparator = "," | ||
| filterApplyFailed = "failed to apply filtering" | ||
| regexString = `^(?P<key>{{(?:\.|[a-zA-Z0-9]+)+}})(?P<operator>(?:=|==|!=|=~|!~))(?P<value>[a-zA-Z0-9-_:/\.\s]+)$` | ||
| ) | ||
|
|
||
| type metaFilter struct { | ||
| identifier string | ||
| expectedValue string | ||
| operator string | ||
| } | ||
|
|
||
| func (mf metaFilter) isExpected(object *api.VM) (bool, error) { | ||
| w := &bytes.Buffer{} | ||
| tm, err := template.New("generic-filtering-vm").Parse(mf.identifier) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to configure filtering with following template: %s", mf.identifier) | ||
| } | ||
| err = tm.Execute(w, object) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to apply filtering on VM, the filter might be incorrect") | ||
| } | ||
| res := w.String() | ||
| switch mf.operator { | ||
| case "==": | ||
| return mf.isEqual(res), nil | ||
| case "=": | ||
| return mf.isEqual(res), nil | ||
| case "!=": | ||
| return !mf.isEqual(res), nil | ||
| case "=~": | ||
| return mf.contains(res), nil | ||
| case "!~": | ||
| return !mf.contains(res), nil | ||
| default: | ||
| return false, fmt.Errorf("Unexpected operator: %s", mf.operator) | ||
| } | ||
| } | ||
|
|
||
| func (mf metaFilter) isEqual(value string) bool { | ||
| return mf.expectedValue == value | ||
| } | ||
|
|
||
| func (mf metaFilter) contains(value string) bool { | ||
| return strings.Contains(value, mf.expectedValue) | ||
| } | ||
|
|
||
| // MultipleMetaFilter stores multiples metaFilter rule | ||
| type MultipleMetaFilter struct { | ||
| filters []metaFilter | ||
| } | ||
|
|
||
| // AreExpected checks fileting rules are expected, an AND logical condition is applid between the underlying filters | ||
| func (mmf *MultipleMetaFilter) AreExpected(object *api.VM) (bool, error) { | ||
| for _, mf := range mmf.filters { | ||
| res, err := mf.isExpected(object) | ||
| if err != nil { | ||
| return false, err | ||
| } else if !res { | ||
| return false, nil | ||
| } | ||
| } | ||
| return true, nil | ||
| } | ||
|
|
||
| // extractKeyValueFiltering extracts the key to search for and the expected value form a string | ||
| func extractKeyValueFiltering(str string) (string, string, string, error) { | ||
| reg, err := regexp.Compile(regexString) | ||
| if err != nil { | ||
| return "", "", "", err | ||
| } | ||
| matches := reg.FindAllStringSubmatch(str, -1) | ||
| if len(matches) != 1 { | ||
| return "", "", "", fmt.Errorf("failed to generate filter") | ||
| } | ||
| match := matches[0] | ||
| if len(match) != 4 { | ||
| return "", "", "", fmt.Errorf("failed to generate filter") | ||
| } | ||
| return match[1], match[3], match[2], nil | ||
| } | ||
|
|
||
| // extractMultipleKeyValueFiltering extracts all the keys and values to filter | ||
| func extractMultipleKeyValueFiltering(f string) ([]metaFilter, error) { | ||
| filterList := strings.Split(f, filterSeparator) | ||
| captureList := make([]metaFilter, 0, len(filterList)) | ||
| for _, filter := range filterList { | ||
| key, value, op, err := extractKeyValueFiltering(filter) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to extract keys-values from filter list %s", filterList) | ||
| } | ||
| captureList = append(captureList, metaFilter{identifier: key, expectedValue: value, operator: op}) | ||
| } | ||
| return captureList, nil | ||
| } | ||
|
|
||
| // GenerateMultipleMetadataFiltering extract filterings and generates MultipleMetadataFiltering | ||
| func GenerateMultipleMetadataFiltering(str string) (*MultipleMetaFilter, error) { | ||
| metaFilterList, err := extractMultipleKeyValueFiltering(str) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &MultipleMetaFilter{ | ||
| filters: metaFilterList, | ||
| }, nil | ||
| } |
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