mirror of
https://github.com/grafana/grafana.git
synced 2024-11-30 12:44:10 -06:00
220 lines
6.9 KiB
Go
220 lines
6.9 KiB
Go
package cloudwatch
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import (
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"errors"
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"fmt"
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"math"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"time"
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"github.com/grafana/grafana-plugin-sdk-go/backend"
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"github.com/grafana/grafana/pkg/components/simplejson"
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)
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// parseQueries parses the json queries and returns a map of cloudWatchQueries by region. The cloudWatchQuery has a 1 to 1 mapping to a query editor row
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func (e *cloudWatchExecutor) parseQueries(queries []backend.DataQuery, startTime time.Time, endTime time.Time) (map[string][]*cloudWatchQuery, error) {
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requestQueries := make(map[string][]*cloudWatchQuery)
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migratedQueries, err := migrateLegacyQuery(queries, startTime, endTime)
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if err != nil {
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return nil, err
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}
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for _, query := range migratedQueries {
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model, err := simplejson.NewJson(query.JSON)
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if err != nil {
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return nil, &queryError{err: err, RefID: query.RefID}
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}
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queryType := model.Get("type").MustString()
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if queryType != "timeSeriesQuery" && queryType != "" {
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continue
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}
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refID := query.RefID
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query, err := parseRequestQuery(model, refID, startTime, endTime)
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if err != nil {
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return nil, &queryError{err: err, RefID: refID}
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}
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if _, exist := requestQueries[query.Region]; !exist {
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requestQueries[query.Region] = []*cloudWatchQuery{}
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}
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requestQueries[query.Region] = append(requestQueries[query.Region], query)
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}
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return requestQueries, nil
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}
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// migrateLegacyQuery migrates queries that has a `statistics` field to use the `statistic` field instead.
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// This migration is also done in the frontend, so this should only ever be needed for alerting queries
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// In case the query used more than one stat, the first stat in the slice will be used in the statistic field
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// Read more here https://github.com/grafana/grafana/issues/30629
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func migrateLegacyQuery(queries []backend.DataQuery, startTime time.Time, endTime time.Time) ([]*backend.DataQuery, error) {
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migratedQueries := []*backend.DataQuery{}
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for _, q := range queries {
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query := q
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model, err := simplejson.NewJson(query.JSON)
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if err != nil {
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return nil, err
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}
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_, err = model.Get("statistic").String()
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// If there's not a statistic property in the json, we know it's the legacy format and then it has to be migrated
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if err != nil {
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stats, err := model.Get("statistics").StringArray()
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if err != nil {
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return nil, fmt.Errorf("query must have either statistic or statistics field")
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}
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model.Del("statistics")
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model.Set("statistic", stats[0])
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query.JSON, err = model.MarshalJSON()
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if err != nil {
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return nil, err
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}
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}
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migratedQueries = append(migratedQueries, &query)
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}
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return migratedQueries, nil
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}
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func parseRequestQuery(model *simplejson.Json, refId string, startTime time.Time, endTime time.Time) (*cloudWatchQuery, error) {
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plog.Debug("Parsing request query", "query", model)
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reNumber := regexp.MustCompile(`^\d+$`)
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region, err := model.Get("region").String()
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if err != nil {
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return nil, err
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}
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namespace, err := model.Get("namespace").String()
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if err != nil {
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return nil, fmt.Errorf("failed to get namespace: %v", err)
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}
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metricName, err := model.Get("metricName").String()
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if err != nil {
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return nil, fmt.Errorf("failed to get metricName: %v", err)
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}
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dimensions, err := parseDimensions(model)
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if err != nil {
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return nil, fmt.Errorf("failed to parse dimensions: %v", err)
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}
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statistic, err := model.Get("statistic").String()
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if err != nil {
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return nil, fmt.Errorf("failed to parse statistic: %v", err)
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}
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p := model.Get("period").MustString("")
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var period int
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if strings.ToLower(p) == "auto" || p == "" {
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deltaInSeconds := endTime.Sub(startTime).Seconds()
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periods := getRetainedPeriods(time.Since(startTime))
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datapoints := int(math.Ceil(deltaInSeconds / 2000))
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period = periods[len(periods)-1]
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for _, value := range periods {
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if datapoints <= value {
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period = value
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break
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}
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}
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} else {
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if reNumber.Match([]byte(p)) {
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period, err = strconv.Atoi(p)
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if err != nil {
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return nil, fmt.Errorf("failed to parse period as integer: %v", err)
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}
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} else {
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d, err := time.ParseDuration(p)
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if err != nil {
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return nil, fmt.Errorf("failed to parse period as duration: %v", err)
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}
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period = int(d.Seconds())
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}
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}
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id := model.Get("id").MustString("")
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if id == "" {
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// Why not just use refId if id is not specified in the frontend? When specifying an id in the editor,
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// and alphabetical must be used. The id must be unique, so if an id like for example a, b or c would be used,
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// it would likely collide with some ref id. That's why the `query` prefix is used.
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id = fmt.Sprintf("query%s", refId)
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}
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expression := model.Get("expression").MustString("")
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alias := model.Get("alias").MustString()
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returnData := !model.Get("hide").MustBool(false)
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queryType := model.Get("type").MustString()
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if queryType == "" {
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// If no type is provided we assume we are called by alerting service, which requires to return data!
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// Note, this is sort of a hack, but the official Grafana interfaces do not carry the information
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// who (which service) called the TsdbQueryEndpoint.Query(...) function.
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returnData = true
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}
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matchExact := model.Get("matchExact").MustBool(true)
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return &cloudWatchQuery{
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RefId: refId,
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Region: region,
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Id: id,
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Namespace: namespace,
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MetricName: metricName,
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Statistic: statistic,
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Expression: expression,
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ReturnData: returnData,
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Dimensions: dimensions,
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Period: period,
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Alias: alias,
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MatchExact: matchExact,
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UsedExpression: "",
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}, nil
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}
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func getRetainedPeriods(timeSince time.Duration) []int {
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// See https://aws.amazon.com/about-aws/whats-new/2016/11/cloudwatch-extends-metrics-retention-and-new-user-interface/
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if timeSince > time.Duration(455)*24*time.Hour {
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return []int{21600, 86400}
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} else if timeSince > time.Duration(63)*24*time.Hour {
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return []int{3600, 21600, 86400}
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} else if timeSince > time.Duration(15)*24*time.Hour {
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return []int{300, 900, 3600, 21600, 86400}
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} else {
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return []int{60, 300, 900, 3600, 21600, 86400}
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}
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}
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func parseDimensions(model *simplejson.Json) (map[string][]string, error) {
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parsedDimensions := make(map[string][]string)
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for k, v := range model.Get("dimensions").MustMap() {
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// This is for backwards compatibility. Before 6.5 dimensions values were stored as strings and not arrays
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if value, ok := v.(string); ok {
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parsedDimensions[k] = []string{value}
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} else if values, ok := v.([]interface{}); ok {
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for _, value := range values {
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parsedDimensions[k] = append(parsedDimensions[k], value.(string))
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}
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} else {
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return nil, errors.New("unknown type as dimension value")
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}
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}
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sortedDimensions := sortDimensions(parsedDimensions)
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return sortedDimensions, nil
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}
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func sortDimensions(dimensions map[string][]string) map[string][]string {
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sortedDimensions := make(map[string][]string)
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var keys []string
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for k := range dimensions {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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for _, k := range keys {
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sortedDimensions[k] = dimensions[k]
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}
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return sortedDimensions
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}
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