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add timescaledb option to postgres datasource

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This adds an option to the postgres datasource config for
timescaledb support. When set to auto it will check for
timescaledb when testing the datasource.

When this option is enabled the $__timeGroup macro will
use the time_bucket function from timescaledb to group
times by an interval.

This also passes the datasource edit control to testDatasource
to allow for setting additional settings, this might be useful
for other datasources aswell which have optional or version
dependant features which can be queried.
This commit is contained in:
Sven Klemm
2018-07-21 20:00:26 +02:00
parent d48f1f57f0
commit b987aee7cf
6 changed files with 85 additions and 24 deletions
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8
pkg/tsdb/postgres/macros.go
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@ -130,13 +130,19 @@ func (m *postgresMacroEngine) evaluateMacro(name string, args []string) (string,
m.query.Model.Set("fillValue", floatVal)
}
}
return fmt.Sprintf("floor(extract(epoch from %s)/%v)*%v", args[0], interval.Seconds(), interval.Seconds()), nil
if m.query.DataSource.JsonData.Get("timescaledb").MustString("auto") == "enabled" {
return fmt.Sprintf("time_bucket('%vs',%s) AS time", interval.Seconds(), args[0]), nil
} else {
return fmt.Sprintf("floor(extract(epoch from %s)/%v)*%v AS time", args[0], interval.Seconds(), interval.Seconds()), nil
}
case "__timeGroupAlias":
tg, err := m.evaluateMacro("__timeGroup", args)
if err == nil {
return tg + " AS \"time\"", err
}
return "", err
case "__unixEpochFilter":
if len(args) == 0 {
return "", fmt.Errorf("missing time column argument for macro %v", name)