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Fix prometheusreceiver TA/scrape_config validation logic #30135

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Fix prometheusreceiver TA/scrape_config validation logic #30135

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e2c168e
Fix prometheusreceiver TA/scrape_config validation logic
Aneurysm9 Dec 19, 2023
90dede4
PR feedback
Aneurysm9 Dec 20, 2023
cdb70a4
Merge branch 'main' into fix/promTACfgValidation
Aneurysm9 Dec 21, 2023
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Fix prometheusreceiver TA/scrape_config validation logic 
Signed-off-by: Anthony J Mirabella <[email protected]>
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@Aneurysm9
Aneurysm9 committed Dec 19, 2023
commit e2c168e780655a0313fb8c813c275aa3d2a41e5e
6 changes: 6 additions & 0 deletions .chloggen/fix_promTACfgValidation.yaml
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@@ -0,0 +1,6 @@
change_type: 'bug_fix'
component: 'prometheusreceiver'
note: Fix configuration validation to allow specification of Target Allocator configuration without providing scrape configurations
issues: [30135]
subtext:
change_logs: []
13 changes: 7 additions & 6 deletions receiver/prometheusreceiver/config.go
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Expand Up @@ -95,11 +95,9 @@ func checkTLSConfig(tlsConfig commonconfig.TLSConfig) error {
// Validate checks the receiver configuration is valid.
func (cfg *Config) Validate() error {
promConfig := cfg.PrometheusConfig
if promConfig != nil {
err := cfg.validatePromConfig(promConfig)
if err != nil {
return err
}
err := cfg.validatePromConfig(promConfig)
if err != nil {
return err
}

if cfg.TargetAllocator != nil {
Expand All @@ -112,8 +110,11 @@ func (cfg *Config) Validate() error {
}

func (cfg *Config) validatePromConfig(promConfig *promconfig.Config) error {
if len(promConfig.ScrapeConfigs) == 0 && cfg.TargetAllocator == nil {
if (promConfig == nil || len(promConfig.ScrapeConfigs) == 0) && cfg.TargetAllocator == nil {
return errors.New("no Prometheus scrape_configs or target_allocator set")
} else if promConfig == nil {
// nothing to validate
return nil
}

// Reject features that Prometheus supports but that the receiver doesn't support:
Expand Down
33 changes: 33 additions & 0 deletions receiver/prometheusreceiver/config_test.go
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Expand Up @@ -66,6 +66,7 @@ func TestLoadTargetAllocatorConfig(t *testing.T) {
sub, err := cm.Sub(component.NewIDWithName(metadata.Type, "").String())
require.NoError(t, err)
require.NoError(t, component.UnmarshalConfig(sub, cfg))
require.NoError(t, component.ValidateConfig(cfg))

r0 := cfg.(*Config)
assert.NotNil(t, r0.PrometheusConfig)
Expand All @@ -77,6 +78,7 @@ func TestLoadTargetAllocatorConfig(t *testing.T) {
require.NoError(t, err)
cfg = factory.CreateDefaultConfig()
require.NoError(t, component.UnmarshalConfig(sub, cfg))
require.NoError(t, component.ValidateConfig(cfg))

r1 := cfg.(*Config)
assert.NotNil(t, r0.PrometheusConfig)
Expand All @@ -92,6 +94,7 @@ func TestLoadTargetAllocatorConfig(t *testing.T) {
require.NoError(t, err)
cfg = factory.CreateDefaultConfig()
require.NoError(t, component.UnmarshalConfig(sub, cfg))
require.NoError(t, component.ValidateConfig(cfg))

r2 := cfg.(*Config)
assert.Equal(t, 1, len(r2.PrometheusConfig.ScrapeConfigs))
Expand All @@ -110,6 +113,36 @@ func TestLoadConfigFailsOnUnknownSection(t *testing.T) {
require.Error(t, component.UnmarshalConfig(sub, cfg))
}

func TestLoadConfigFailsOnNoPrometheusOrTAConfig(t *testing.T) {
cm, err := confmaptest.LoadConf(filepath.Join("testdata", "invalid-config-prometheus-non-existent-scrape-config.yaml"))
require.NoError(t, err)
factory := NewFactory()

cfg := factory.CreateDefaultConfig()
sub, err := cm.Sub(component.NewIDWithName(metadata.Type, "").String())
require.NoError(t, err)
require.NoError(t, component.UnmarshalConfig(sub, cfg))
require.ErrorContains(t, component.ValidateConfig(cfg), "no Prometheus scrape_configs or target_allocator set")

cfg = factory.CreateDefaultConfig()
sub, err = cm.Sub(component.NewIDWithName(metadata.Type, "withConfigAndTA").String())
require.NoError(t, err)
require.NoError(t, component.UnmarshalConfig(sub, cfg))
require.NoError(t, component.ValidateConfig(cfg))

cfg = factory.CreateDefaultConfig()
sub, err = cm.Sub(component.NewIDWithName(metadata.Type, "withOnlyTA").String())
require.NoError(t, err)
require.NoError(t, component.UnmarshalConfig(sub, cfg))
require.NoError(t, component.ValidateConfig(cfg))

cfg = factory.CreateDefaultConfig()
sub, err = cm.Sub(component.NewIDWithName(metadata.Type, "withOnlyScrape").String())
require.NoError(t, err)
require.NoError(t, component.UnmarshalConfig(sub, cfg))
require.NoError(t, component.ValidateConfig(cfg))
}

// As one of the config parameters is consuming prometheus
// configuration as a subkey, ensure that invalid configuration
// within the subkey will also raise an error.
Expand Down
19 changes: 19 additions & 0 deletions ...ver/prometheusreceiver/testdata/invalid-config-prometheus-non-existent-scrape-config.yaml
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prometheus:
prometheus/withConfigAndTA:
target_allocator:
endpoint: http://localhost:8080
interval: 30s
collector_id: collector-1
config:
global:
scrape_interval: 30s
prometheus/withOnlyTA:
target_allocator:
endpoint: http://localhost:8080
interval: 30s
collector_id: collector-1
prometheus/withOnlyScrape:
config:
scrape_configs:
- job_name: 'demo'
scrape_interval: 5s