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* PMM-10464 Initial commit. * PMM-10464 Refactoring tests. * PMM-10464 FetchMetrics for Grafana DB. * PMM-10464 FetchMetrics for Grafana DB. * PMM-10464 Tests and code adjustments. * PMM-10464 Tests and code adjustments. * PMM-10464 Code adjustments. * PMM-10464 Code adjustments. * PMM-10464 pre/post fetching methods in telemetry datasources. * PMM-10464 pre/post fetching methods in telemetry datasources. * PMM-10464 Fixing tests. * PMM-10464 Fixing tests. * PMM-10464 Code review adjustments. * PMM-10464 bump sqlitedb driver * PMM-10464 GrafanaUsersCount metrics. * PMM-10464 Licenses fix + go.mod cleanup. * PMM-10464 Tests fix after rebase. * PMM-10464 Codereview adjustments. * PMM-10464 Codereview adjustments. * PMM-10464 Changeing sqlite driver. * PMM-10464 Comment fixing. * PMM-10464 Comment fixing. * PMM-10464 Code review adjustments. * PMM-10464 Linter fixes.
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126 changes: 126 additions & 0 deletions
126
managed/services/telemetry/datasource_grafana_sqlitedb.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| // Copyright (C) 2017 Percona LLC | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Affero General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Affero General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Affero General Public License | ||
| // along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
|
|
||
| // Package telemetry provides telemetry functionality. | ||
| package telemetry | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql" | ||
| "io" | ||
| "os" | ||
|
|
||
| // Events, errors and driver for for grafana sqlite database. | ||
| pmmv1 "github.com/percona-platform/saas/gen/telemetry/events/pmm" | ||
| "github.com/pkg/errors" | ||
| "github.com/sirupsen/logrus" | ||
| _ "modernc.org/sqlite" | ||
| ) | ||
|
|
||
| type dsGrafanaSelect struct { | ||
| l *logrus.Entry | ||
| config DSGrafanaSqliteDB | ||
| db *sql.DB | ||
| tempFile string | ||
| } | ||
|
|
||
| // check interfaces. | ||
| var ( | ||
| _ DataSource = (*dsGrafanaSelect)(nil) | ||
| ) | ||
|
|
||
| // Enabled flag that determines if data source is enabled. | ||
| func (d *dsGrafanaSelect) Enabled() bool { | ||
| return d.config.Enabled | ||
| } | ||
|
|
||
| // NewDataSourceGrafanaSqliteDB makes new data source for grafana sqlite database metrics. | ||
| func NewDataSourceGrafanaSqliteDB(config DSGrafanaSqliteDB, l *logrus.Entry) DataSource { | ||
| return &dsGrafanaSelect{ | ||
| l: l, | ||
| config: config, | ||
| db: nil, | ||
| tempFile: "", | ||
| } | ||
| } | ||
|
|
||
| func (d *dsGrafanaSelect) Init(ctx context.Context) error { | ||
| // validate source file db | ||
| sourceFileStat, err := os.Stat(d.config.DBFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if sourceFileStat.Size() == 0 { | ||
| return errors.Errorf("Sourcefile %s is empty.", d.config.DBFile) | ||
| } | ||
|
|
||
| if !sourceFileStat.Mode().IsRegular() { | ||
| return errors.Wrapf(err, "%s is not a regular file", d.config.DBFile) | ||
| } | ||
|
|
||
| source, err := os.Open(d.config.DBFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| tempFile, err := os.CreateTemp(os.TempDir(), "grafana") | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| defer func() { | ||
| if err := source.Close(); err != nil { | ||
| d.l.Errorf("Error closing file. %s", err) | ||
| } | ||
| }() | ||
|
|
||
| nBytes, err := io.Copy(tempFile, source) | ||
| d.l.Debugf("grafana sqlitedb copied with total bytes: %d", nBytes) | ||
| if err != nil || nBytes == 0 { | ||
| return errors.Wrapf(err, "cannot create copy of database file %s", d.config.DBFile) | ||
| } | ||
|
|
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| db, err := sql.Open("sqlite", tempFile.Name()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| d.tempFile = tempFile.Name() | ||
| d.db = db | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (d *dsGrafanaSelect) FetchMetrics(ctx context.Context, config Config) ([]*pmmv1.ServerMetric_Metric, error) { | ||
| if d.db == nil { | ||
| return nil, errors.Errorf("temporary grafana database is not initialized: %s", d.config.DBFile) | ||
| } | ||
| return fetchMetricsFromDB(ctx, d.l, d.config.Timeout, d.db, config) | ||
| } | ||
|
|
||
| func (d *dsGrafanaSelect) Dispose(ctx context.Context) error { | ||
| err := d.db.Close() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| err = os.Remove(d.tempFile) | ||
| if err != nil { | ||
| return errors.Wrapf(err, "failed to remove sqlite database file") | ||
| } | ||
|
|
||
| return nil | ||
| } |
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