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Make the scrape.metricMetadataStore interface public

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To test the implementation of our metric metadata API, we need to represent various states of metadata in the scrape metadata store. That is currently not possible as the interface and method to set the store are private.

This changes the interface, list and get methods, and the SetMetadaStore function to be public.

Incidentally, the scrapeCache implementation needs to be renamed to match the new signature.

Signed-off-by: gotjosh <josue@grafana.com>
This commit is contained in:
gotjosh 2019-12-04 15:18:27 +00:00
parent 4bf9c6bb82
commit 05842176a6
3 changed files with 13 additions and 13 deletions
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6
scrape/scrape.go
View file

@ -209,7 +209,7 @@ func newScrapePool(cfg *config.ScrapeConfig, app Appendable, jitterSeed uint64,
sp.newLoop = func(opts scrapeLoopOptions) loop {
// Update the targets retrieval function for metadata to a new scrape cache.
cache := newScrapeCache()
opts.target.setMetadataStore(cache)
opts.target.SetMetadataStore(cache)
return newScrapeLoop(
ctx,
@ -794,7 +794,7 @@ func (c *scrapeCache) setUnit(metric, unit []byte) {
c.metaMtx.Unlock()
}
func (c *scrapeCache) getMetadata(metric string) (MetricMetadata, bool) {
func (c *scrapeCache) GetMetadata(metric string) (MetricMetadata, bool) {
c.metaMtx.Lock()
defer c.metaMtx.Unlock()
@ -810,7 +810,7 @@ func (c *scrapeCache) getMetadata(metric string) (MetricMetadata, bool) {
}, true
}
func (c *scrapeCache) listMetadata() []MetricMetadata {
func (c *scrapeCache) ListMetadata() []MetricMetadata {
c.metaMtx.Lock()
defer c.metaMtx.Unlock()

6
scrape/scrape_test.go
View file

@ -615,19 +615,19 @@ test_metric 1
testutil.Ok(t, err)
testutil.Equals(t, 1, total)
md, ok := cache.getMetadata("test_metric")
md, ok := cache.GetMetadata("test_metric")
testutil.Assert(t, ok, "expected metadata to be present")
testutil.Assert(t, textparse.MetricTypeCounter == md.Type, "unexpected metric type")
testutil.Equals(t, "some help text", md.Help)
testutil.Equals(t, "metric", md.Unit)
md, ok = cache.getMetadata("test_metric_no_help")
md, ok = cache.GetMetadata("test_metric_no_help")
testutil.Assert(t, ok, "expected metadata to be present")
testutil.Assert(t, textparse.MetricTypeGauge == md.Type, "unexpected metric type")
testutil.Equals(t, "", md.Help)
testutil.Equals(t, "", md.Unit)
md, ok = cache.getMetadata("test_metric_no_type")
md, ok = cache.GetMetadata("test_metric_no_type")
testutil.Assert(t, ok, "expected metadata to be present")
testutil.Assert(t, textparse.MetricTypeUnknown == md.Type, "unexpected metric type")
testutil.Equals(t, "other help text", md.Help)

14
scrape/target.go
View file

@ -58,7 +58,7 @@ type Target struct {
lastScrape time.Time
lastScrapeDuration time.Duration
health TargetHealth
metadata metricMetadataStore
metadata MetricMetadataStore
}
// NewTarget creates a reasonably configured target for querying.
@ -75,9 +75,9 @@ func (t *Target) String() string {
return t.URL().String()
}
type metricMetadataStore interface {
listMetadata() []MetricMetadata
getMetadata(metric string) (MetricMetadata, bool)
type MetricMetadataStore interface {
ListMetadata() []MetricMetadata
GetMetadata(metric string) (MetricMetadata, bool)
}
// MetricMetadata is a piece of metadata for a metric.
@ -95,7 +95,7 @@ func (t *Target) MetadataList() []MetricMetadata {
if t.metadata == nil {
return nil
}
return t.metadata.listMetadata()
return t.metadata.ListMetadata()
}
// Metadata returns type and help metadata for the given metric.
@ -106,10 +106,10 @@ func (t *Target) Metadata(metric string) (MetricMetadata, bool) {
if t.metadata == nil {
return MetricMetadata{}, false
}
return t.metadata.getMetadata(metric)
return t.metadata.GetMetadata(metric)
}
func (t *Target) setMetadataStore(s metricMetadataStore) {
func (t *Target) SetMetadataStore(s MetricMetadataStore) {
t.mtx.Lock()
defer t.mtx.Unlock()
t.metadata = s