mirror of
https://github.com/grafana/grafana.git
synced 2024-12-02 13:39:19 -06:00
136 lines
4.2 KiB
Go
136 lines
4.2 KiB
Go
package sqlstore
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import (
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"context"
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"database/sql"
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"database/sql/driver"
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"errors"
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"fmt"
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"time"
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"github.com/gchaincl/sqlhooks"
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"github.com/go-sql-driver/mysql"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/services/sqlstore/migrator"
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"github.com/lib/pq"
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"github.com/mattn/go-sqlite3"
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"github.com/opentracing/opentracing-go"
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ol "github.com/opentracing/opentracing-go/log"
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"github.com/prometheus/client_golang/prometheus"
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cw "github.com/weaveworks/common/middleware"
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"xorm.io/core"
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)
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var (
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databaseQueryHistogram *prometheus.HistogramVec
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)
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func init() {
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databaseQueryHistogram = prometheus.NewHistogramVec(prometheus.HistogramOpts{
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Namespace: "grafana",
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Name: "database_queries_duration_seconds",
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Help: "Database query histogram",
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Buckets: prometheus.ExponentialBuckets(0.00001, 4, 10),
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}, []string{"status"})
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prometheus.MustRegister(databaseQueryHistogram)
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}
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// WrapDatabaseDriverWithHooks creates a fake database driver that
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// executes pre and post functions which we use to gather metrics about
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// database queries. It also registers the metrics.
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func WrapDatabaseDriverWithHooks(dbType string) string {
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drivers := map[string]driver.Driver{
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migrator.SQLite: &sqlite3.SQLiteDriver{},
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migrator.MySQL: &mysql.MySQLDriver{},
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migrator.Postgres: &pq.Driver{},
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}
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d, exist := drivers[dbType]
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if !exist {
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return dbType
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}
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driverWithHooks := dbType + "WithHooks"
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sql.Register(driverWithHooks, sqlhooks.Wrap(d, &databaseQueryWrapper{log: log.New("sqlstore.metrics")}))
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core.RegisterDriver(driverWithHooks, &databaseQueryWrapperDriver{dbType: dbType})
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return driverWithHooks
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}
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// databaseQueryWrapper satisfies the sqlhook.databaseQueryWrapper interface
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// which allow us to wrap all SQL queries with a `Before` & `After` hook.
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type databaseQueryWrapper struct {
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log log.Logger
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}
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// databaseQueryWrapperKey is used as key to save values in `context.Context`
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type databaseQueryWrapperKey struct{}
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// Before hook will print the query with its args and return the context with the timestamp
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func (h *databaseQueryWrapper) Before(ctx context.Context, query string, args ...interface{}) (context.Context, error) {
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return context.WithValue(ctx, databaseQueryWrapperKey{}, time.Now()), nil
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}
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// After hook will get the timestamp registered on the Before hook and print the elapsed time
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func (h *databaseQueryWrapper) After(ctx context.Context, query string, args ...interface{}) (context.Context, error) {
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h.instrument(ctx, "success", query, nil)
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return ctx, nil
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}
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func (h *databaseQueryWrapper) instrument(ctx context.Context, status string, query string, err error) {
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begin := ctx.Value(databaseQueryWrapperKey{}).(time.Time)
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elapsed := time.Since(begin)
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histogram := databaseQueryHistogram.WithLabelValues(status)
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if traceID, ok := cw.ExtractSampledTraceID(ctx); ok {
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// Need to type-convert the Observer to an
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// ExemplarObserver. This will always work for a
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// HistogramVec.
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histogram.(prometheus.ExemplarObserver).ObserveWithExemplar(
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elapsed.Seconds(), prometheus.Labels{"traceID": traceID},
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)
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} else {
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histogram.Observe(elapsed.Seconds())
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}
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span, _ := opentracing.StartSpanFromContext(ctx, "database query")
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defer span.Finish()
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span.LogFields(
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ol.String("query", query),
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ol.String("status", status))
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if err != nil {
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span.LogFields(ol.String("error", err.Error()))
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}
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h.log.Debug("query finished", "status", status, "elapsed time", elapsed, "sql", query, "error", err)
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}
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// OnError will be called if any error happens
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func (h *databaseQueryWrapper) OnError(ctx context.Context, err error, query string, args ...interface{}) error {
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status := "error"
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// https://golang.org/pkg/database/sql/driver/#ErrSkip
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if err == nil || errors.Is(err, driver.ErrSkip) {
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status = "success"
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}
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h.instrument(ctx, status, query, err)
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return err
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}
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// databaseQueryWrapperDriver satisfies the xorm.io/core.Driver interface
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type databaseQueryWrapperDriver struct {
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dbType string
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}
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func (hp *databaseQueryWrapperDriver) Parse(driverName, dataSourceName string) (*core.Uri, error) {
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driver := core.QueryDriver(hp.dbType)
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if driver == nil {
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return nil, fmt.Errorf("could not find driver with name %s", hp.dbType)
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}
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return driver.Parse(driverName, dataSourceName)
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}
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