traffic_stats/influxdb/query.go

/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you 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://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 influxdb

import (
	influx "github.com/influxdata/influxdb/client/v2"
	"github.com/pkg/errors"
)

// QueryDB takes an influx client interface, cmd, and db strings. It tries to
// execute the query on the given client, and returns a slice of influx.Result,
// and an error, if any were present
func QueryDB(client influx.Client, cmd, db string) (res []influx.Result, err error) {
	q := influx.Query{
		Command:  cmd,
		Database: db,
	}
	response, err := client.Query(q)
	if err != nil {
		return res, errors.Wrapf(err, "failed to execute cmd: %s on db %s", cmd, db)
	}
	if response.Error() != nil {
		return res, errors.Wrapf(response.Error(), "got error in query response for cmd: %s on db %s", cmd, db)
	}
	res = response.Results

	return res, err
}

// Create takes an influx.Client, and a create cmd in order to create objects
// in the influx db (it doesn't require a db argument like QueryDB)
func Create(client influx.Client, cmd string) (err error) {
	_, err = QueryDB(client, cmd, "")
	return err
}