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scraper.go
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scraper.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http:https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sqlqueryreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/sqlqueryreceiver"
import (
"context"
"database/sql"
"fmt"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.opentelemetry.io/collector/receiver/scraperhelper"
"go.uber.org/multierr"
"go.uber.org/zap"
)
type scraper struct {
id config.ComponentID
query Query
clientProviderFunc clientProviderFunc
dbProviderFunc dbProviderFunc
logger *zap.Logger
client dbClient
db *sql.DB
}
var _ scraperhelper.Scraper = (*scraper)(nil)
func (s scraper) ID() config.ComponentID {
return s.id
}
func (s *scraper) Start(context.Context, component.Host) error {
var err error
s.db, err = s.dbProviderFunc()
if err != nil {
return fmt.Errorf("failed to open db connection: %w", err)
}
s.client = s.clientProviderFunc(s.db, s.query.SQL, s.logger)
return nil
}
func (s scraper) Scrape(ctx context.Context) (pmetric.Metrics, error) {
out := pmetric.NewMetrics()
rows, err := s.client.metricRows(ctx)
if err != nil {
return out, fmt.Errorf("scraper: %w", err)
}
rms := out.ResourceMetrics()
rm := rms.AppendEmpty()
sms := rm.ScopeMetrics()
sm := sms.AppendEmpty()
ms := sm.Metrics()
var errs error
for _, metricCfg := range s.query.Metrics {
for i, row := range rows {
if err = rowToMetric(row, metricCfg, ms.AppendEmpty()); err != nil {
err = fmt.Errorf("row %d: %w", i, err)
errs = multierr.Append(errs, err)
}
}
}
if errs != nil {
errs = fmt.Errorf("scraper.Scrape row conversion errors: %w", errs)
}
return out, errs
}
func (s scraper) Shutdown(ctx context.Context) error {
return s.db.Close()
}