| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package azure_monitor |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "time" |
| 10 | ) |
| 11 | |
| 12 | func (c *Collector) collect(ctx context.Context) error { |
| 13 | hasResources, err := c.refreshCollectResources(ctx) |
| 14 | if err != nil { |
| 15 | return err |
| 16 | } |
| 17 | if !hasResources { |
| 18 | return nil |
| 19 | } |
| 20 | |
| 21 | now := c.now() |
| 22 | queryBatches := c.buildQueryBatches(now) |
| 23 | |
| 24 | dueInstruments := dueInstrumentsForBatches(queryBatches) |
| 25 | samples, err := c.collectQuerySamples(ctx, queryBatches, now) |
| 26 | if err != nil { |
| 27 | return err |
| 28 | } |
| 29 | |
| 30 | observedThisCycle := c.observations.observeSamples(samples) |
| 31 | c.observations.reobserveCachedObservations(dueInstruments, observedThisCycle) |
| 32 | |
| 33 | return nil |
| 34 | } |
| 35 | |
| 36 | func (c *Collector) refreshCollectResources(ctx context.Context) (bool, error) { |
| 37 | if err := c.ensureBootstrapped(ctx); err != nil { |
| 38 | return false, err |
| 39 | } |
| 40 | |
| 41 | prevFetchCounter := c.discovery.FetchCounter |
| 42 | resources, err := c.refreshDiscovery(ctx, false) |
| 43 | if err != nil { |
| 44 | if c.discovery.FetchedAt.IsZero() { |
| 45 | return false, fmt.Errorf("resource discovery: %w", err) |
| 46 | } |
| 47 | c.Warningf("resource discovery refresh failed, continuing with last known discovery snapshot: %v", err) |
| 48 | resources = c.discovery.Resources |
| 49 | } |
| 50 | if c.discovery.FetchCounter != prevFetchCounter { |
| 51 | c.observations.pruneStaleResources(c.discovery.ByProfile) |
| 52 | } |
| 53 | return len(resources) > 0, nil |
| 54 | } |
| 55 | |
| 56 | func (c *Collector) collectQuerySamples(ctx context.Context, batches []queryBatch, queryNow time.Time) ([]metricSample, error) { |
| 57 | if len(batches) == 0 { |
| 58 | return nil, nil |
| 59 | } |
| 60 | |
| 61 | results := c.queryExecutor.runQueryBatches(ctx, batches, queryNow, c.QueryOffset) |
| 62 | |
| 63 | var ( |
| 64 | allSamples []metricSample |
| 65 | errCount int |
| 66 | ) |
| 67 | for _, res := range results { |
| 68 | if res.Err != nil { |
| 69 | errCount++ |
| 70 | c.Warningf("collection batch failed: %v", res.Err) |
| 71 | continue |
| 72 | } |
| 73 | allSamples = append(allSamples, res.Samples...) |
| 74 | } |
| 75 | |
| 76 | if errCount == len(results) { |
| 77 | return nil, errors.New("all Azure Monitor batch queries failed") |
| 78 | } |
| 79 | |
| 80 | return allSamples, nil |
| 81 | } |