mirror of
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389 lines
11 KiB
Go
389 lines
11 KiB
Go
package azuremonitor
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"path"
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"sort"
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"strings"
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"time"
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"github.com/grafana/grafana-plugin-sdk-go/data"
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"github.com/grafana/grafana/pkg/api/pluginproxy"
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"github.com/grafana/grafana/pkg/models"
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"github.com/grafana/grafana/pkg/plugins"
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"github.com/grafana/grafana/pkg/setting"
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"github.com/grafana/grafana/pkg/util/errutil"
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opentracing "github.com/opentracing/opentracing-go"
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"golang.org/x/net/context/ctxhttp"
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"github.com/grafana/grafana/pkg/tsdb"
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)
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// AzureMonitorDatasource calls the Azure Monitor API - one of the four API's supported
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type AzureMonitorDatasource struct {
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httpClient *http.Client
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dsInfo *models.DataSource
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}
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var (
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// 1m, 5m, 15m, 30m, 1h, 6h, 12h, 1d in milliseconds
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defaultAllowedIntervalsMS = []int64{60000, 300000, 900000, 1800000, 3600000, 21600000, 43200000, 86400000}
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)
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const azureMonitorAPIVersion = "2018-01-01"
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// executeTimeSeriesQuery does the following:
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// 1. build the AzureMonitor url and querystring for each query
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// 2. executes each query by calling the Azure Monitor API
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// 3. parses the responses for each query into the timeseries format
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func (e *AzureMonitorDatasource) executeTimeSeriesQuery(ctx context.Context, originalQueries []*tsdb.Query, timeRange *tsdb.TimeRange) (*tsdb.Response, error) {
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result := &tsdb.Response{
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Results: map[string]*tsdb.QueryResult{},
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}
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queries, err := e.buildQueries(originalQueries, timeRange)
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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 queries {
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queryRes, resp, err := e.executeQuery(ctx, query, originalQueries, timeRange)
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if err != nil {
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return nil, err
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}
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err = e.parseResponse(queryRes, resp, query)
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if err != nil {
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queryRes.Error = err
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}
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result.Results[query.RefID] = queryRes
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}
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return result, nil
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}
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func (e *AzureMonitorDatasource) buildQueries(queries []*tsdb.Query, timeRange *tsdb.TimeRange) ([]*AzureMonitorQuery, error) {
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azureMonitorQueries := []*AzureMonitorQuery{}
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startTime, err := timeRange.ParseFrom()
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if err != nil {
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return nil, err
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}
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endTime, err := timeRange.ParseTo()
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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 queries {
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var target string
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queryBytes, err := query.Model.Encode()
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if err != nil {
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return nil, fmt.Errorf("failed to re-encode the Azure Monitor query into JSON: %w", err)
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}
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queryJSONModel := azureMonitorJSONQuery{}
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err = json.Unmarshal(queryBytes, &queryJSONModel)
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if err != nil {
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return nil, fmt.Errorf("failed to decode the Azure Monitor query object from JSON: %w", err)
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}
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azJSONModel := queryJSONModel.AzureMonitor
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urlComponents := map[string]string{}
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urlComponents["subscription"] = queryJSONModel.Subscription
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urlComponents["resourceGroup"] = azJSONModel.ResourceGroup
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urlComponents["metricDefinition"] = azJSONModel.MetricDefinition
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urlComponents["resourceName"] = azJSONModel.ResourceName
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ub := urlBuilder{
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DefaultSubscription: query.DataSource.JsonData.Get("subscriptionId").MustString(),
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Subscription: queryJSONModel.Subscription,
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ResourceGroup: queryJSONModel.AzureMonitor.ResourceGroup,
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MetricDefinition: azJSONModel.MetricDefinition,
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ResourceName: azJSONModel.ResourceName,
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}
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azureURL := ub.Build()
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alias := azJSONModel.Alias
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timeGrain := azJSONModel.TimeGrain
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timeGrains := azJSONModel.AllowedTimeGrainsMs
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if timeGrain == "auto" {
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timeGrain, err = setAutoTimeGrain(query.IntervalMs, timeGrains)
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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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params := url.Values{}
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params.Add("api-version", azureMonitorAPIVersion)
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params.Add("timespan", fmt.Sprintf("%v/%v", startTime.UTC().Format(time.RFC3339), endTime.UTC().Format(time.RFC3339)))
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params.Add("interval", timeGrain)
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params.Add("aggregation", azJSONModel.Aggregation)
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params.Add("metricnames", azJSONModel.MetricName) // MetricName or MetricNames ?
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params.Add("metricnamespace", azJSONModel.MetricNamespace)
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// old model
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dimension := strings.TrimSpace(azJSONModel.Dimension)
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dimensionFilter := strings.TrimSpace(azJSONModel.DimensionFilter)
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dimSB := strings.Builder{}
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if dimension != "" && dimensionFilter != "" && dimension != "None" && len(azJSONModel.DimensionsFilters) == 0 {
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dimSB.WriteString(fmt.Sprintf("%s eq '%s'", dimension, dimensionFilter))
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} else {
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for i, filter := range azJSONModel.DimensionsFilters {
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dimSB.WriteString(filter.String())
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if i != len(azJSONModel.DimensionsFilters)-1 {
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dimSB.WriteString(" and ")
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}
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}
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}
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if dimSB.String() != "" {
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params.Add("$filter", dimSB.String())
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params.Add("top", azJSONModel.Top)
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}
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target = params.Encode()
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if setting.Env == setting.DEV {
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azlog.Debug("Azuremonitor request", "params", params)
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}
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azureMonitorQueries = append(azureMonitorQueries, &AzureMonitorQuery{
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URL: azureURL,
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UrlComponents: urlComponents,
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Target: target,
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Params: params,
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RefID: query.RefId,
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Alias: alias,
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})
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}
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return azureMonitorQueries, nil
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}
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func (e *AzureMonitorDatasource) executeQuery(ctx context.Context, query *AzureMonitorQuery, queries []*tsdb.Query, timeRange *tsdb.TimeRange) (*tsdb.QueryResult, AzureMonitorResponse, error) {
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queryResult := &tsdb.QueryResult{RefId: query.RefID}
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req, err := e.createRequest(ctx, e.dsInfo)
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if err != nil {
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queryResult.Error = err
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return queryResult, AzureMonitorResponse{}, nil
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}
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req.URL.Path = path.Join(req.URL.Path, query.URL)
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req.URL.RawQuery = query.Params.Encode()
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span, ctx := opentracing.StartSpanFromContext(ctx, "azuremonitor query")
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span.SetTag("target", query.Target)
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span.SetTag("from", timeRange.From)
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span.SetTag("until", timeRange.To)
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span.SetTag("datasource_id", e.dsInfo.Id)
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span.SetTag("org_id", e.dsInfo.OrgId)
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defer span.Finish()
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if err := opentracing.GlobalTracer().Inject(
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span.Context(),
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opentracing.HTTPHeaders,
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opentracing.HTTPHeadersCarrier(req.Header)); err != nil {
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queryResult.Error = err
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return queryResult, AzureMonitorResponse{}, nil
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}
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azlog.Debug("AzureMonitor", "Request ApiURL", req.URL.String())
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azlog.Debug("AzureMonitor", "Target", query.Target)
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res, err := ctxhttp.Do(ctx, e.httpClient, req)
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if err != nil {
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queryResult.Error = err
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return queryResult, AzureMonitorResponse{}, nil
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}
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data, err := e.unmarshalResponse(res)
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if err != nil {
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queryResult.Error = err
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return queryResult, AzureMonitorResponse{}, nil
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}
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return queryResult, data, nil
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}
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func (e *AzureMonitorDatasource) createRequest(ctx context.Context, dsInfo *models.DataSource) (*http.Request, error) {
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// find plugin
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plugin, ok := plugins.DataSources[dsInfo.Type]
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if !ok {
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return nil, errors.New("Unable to find datasource plugin Azure Monitor")
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}
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var azureMonitorRoute *plugins.AppPluginRoute
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for _, route := range plugin.Routes {
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if route.Path == "azuremonitor" {
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azureMonitorRoute = route
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break
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}
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}
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cloudName := dsInfo.JsonData.Get("cloudName").MustString("azuremonitor")
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proxyPass := fmt.Sprintf("%s/subscriptions", cloudName)
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u, err := url.Parse(dsInfo.Url)
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if err != nil {
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return nil, err
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}
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u.Path = path.Join(u.Path, "render")
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req, err := http.NewRequest(http.MethodGet, u.String(), nil)
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if err != nil {
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azlog.Debug("Failed to create request", "error", err)
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return nil, errutil.Wrap("Failed to create request", err)
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("User-Agent", fmt.Sprintf("Grafana/%s", setting.BuildVersion))
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pluginproxy.ApplyRoute(ctx, req, proxyPass, azureMonitorRoute, dsInfo)
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return req, nil
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}
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func (e *AzureMonitorDatasource) unmarshalResponse(res *http.Response) (AzureMonitorResponse, error) {
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body, err := ioutil.ReadAll(res.Body)
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defer res.Body.Close()
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if err != nil {
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return AzureMonitorResponse{}, err
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}
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if res.StatusCode/100 != 2 {
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azlog.Debug("Request failed", "status", res.Status, "body", string(body))
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return AzureMonitorResponse{}, fmt.Errorf("Request failed status: %v", res.Status)
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}
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var data AzureMonitorResponse
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err = json.Unmarshal(body, &data)
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if err != nil {
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azlog.Debug("Failed to unmarshal AzureMonitor response", "error", err, "status", res.Status, "body", string(body))
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return AzureMonitorResponse{}, err
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}
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return data, nil
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}
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func (e *AzureMonitorDatasource) parseResponse(queryRes *tsdb.QueryResult, amr AzureMonitorResponse, query *AzureMonitorQuery) error {
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if len(amr.Value) == 0 {
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return nil
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}
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frames := data.Frames{}
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for _, series := range amr.Value[0].Timeseries {
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labels := data.Labels{}
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for _, md := range series.Metadatavalues {
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labels[md.Name.LocalizedValue] = md.Value
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}
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frame := data.NewFrameOfFieldTypes("", len(series.Data), data.FieldTypeTime, data.FieldTypeFloat64)
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frame.RefID = query.RefID
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dataField := frame.Fields[1]
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dataField.Name = amr.Value[0].Name.LocalizedValue
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dataField.Labels = labels
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dataField.SetConfig(&data.FieldConfig{
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Unit: amr.Value[0].Unit,
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})
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if query.Alias != "" {
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dataField.Config.DisplayName = formatAzureMonitorLegendKey(query.Alias, query.UrlComponents["resourceName"],
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amr.Value[0].Name.LocalizedValue, "", "", amr.Namespace, amr.Value[0].ID, labels)
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}
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requestedAgg := query.Params.Get("aggregation")
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for i, point := range series.Data {
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var value float64
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switch requestedAgg {
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case "Average":
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value = point.Average
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case "Total":
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value = point.Total
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case "Maximum":
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value = point.Maximum
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case "Minimum":
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value = point.Minimum
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case "Count":
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value = point.Count
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default:
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value = point.Count
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}
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frame.SetRow(i, point.TimeStamp, value)
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}
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frames = append(frames, frame)
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}
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queryRes.Dataframes = tsdb.NewDecodedDataFrames(frames)
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return nil
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}
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// formatAzureMonitorLegendKey builds the legend key or timeseries name
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// Alias patterns like {{resourcename}} are replaced with the appropriate data values.
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func formatAzureMonitorLegendKey(alias string, resourceName string, metricName string, metadataName string, metadataValue string, namespace string, seriesID string, labels data.Labels) string {
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startIndex := strings.Index(seriesID, "/resourceGroups/") + 16
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endIndex := strings.Index(seriesID, "/providers")
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resourceGroup := seriesID[startIndex:endIndex]
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// Could be a collision problem if there were two keys that varied only in case, but I don't think that would happen in azure.
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lowerLabels := data.Labels{}
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for k, v := range labels {
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lowerLabels[strings.ToLower(k)] = v
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}
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keys := make([]string, 0, len(labels))
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for k := range lowerLabels {
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keys = append(keys, k)
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}
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keys = sort.StringSlice(keys)
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result := legendKeyFormat.ReplaceAllFunc([]byte(alias), func(in []byte) []byte {
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metaPartName := strings.Replace(string(in), "{{", "", 1)
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metaPartName = strings.Replace(metaPartName, "}}", "", 1)
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metaPartName = strings.ToLower(strings.TrimSpace(metaPartName))
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if metaPartName == "resourcegroup" {
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return []byte(resourceGroup)
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}
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if metaPartName == "namespace" {
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return []byte(namespace)
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}
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if metaPartName == "resourcename" {
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return []byte(resourceName)
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}
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if metaPartName == "metric" {
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return []byte(metricName)
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}
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if metaPartName == "dimensionname" {
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return []byte(keys[0])
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}
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if metaPartName == "dimensionvalue" {
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return []byte(lowerLabels[keys[0]])
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}
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if v, ok := lowerLabels[metaPartName]; ok {
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return []byte(v)
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}
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return in
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})
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return string(result)
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}
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