InfluxDB::HTTP3pm

The perl way to interact with influxdb!

Usage

InfluxDB::HTTP allows you to interact with the InfluxDB HTTP API. The module essentially provides one method per InfluxDB HTTP API endpoint, that is "ping", "write" and "query".

    use InfluxDB::HTTP;
    my $influx = InfluxDB::HTTP->new();
    my $ping_result = $influx->ping();
    print "$ping_result\n";
    my $query = $influx->query(
        [ 'SELECT Lookups FROM _internal.monitor.runtime WHERE time > '.(time - 60)*1000000000, 'SHOW DATABASES'],
        epoch => 's',
    );
    print "$query\n";

Version

Version 0.04

Subroutines/methods

Return values and error handling

"Object::Result" is relied upon for returning data from subroutines. The respective result object can always be used as string and evaluated on a boolean basis. A result object evaluating to false indicates an error and a corresponding error message is provided in the attribute "error":

    my $ping = $influx->ping();
    print $ping->error unless ($ping);

Furthermore, all result objects provide access to the "HTTP::Response" object that is returned by InfluxDB in the attribute "raw".

new host => 'localhost', port => 8086, timeout => 600

Passing "host", "port" and/or "timeout" is optional, defaulting to the InfluxDB defaults or to 3 minutes for the timeout. The timeout is in seconds.

Returns an instance of InfluxDB::HTTP.

ping

Pings the InfluxDB instance configured in the constructor (i.e. by "host" and "port").

Returned object evaluates to true or false depending on whether the ping was successful or not. If true, then it contains a "version" attribute that indicates the InfluxDB version running on the pinged server.

The "version" attribute is extracted from the "X-Influxdb-Version" HTTP response header, which is part of the HTTP response from the pinged InfluxDB instance.

    my $ping = $influx->ping();
    print $ping->version if ($ping);

query query, database => "DATABASE", chunk_size => CHUNK_SIZE, epoch => "ns"

Used to query the InfluxDB instance. All parameters but the first one are optional. The "query" parameter can either be a String or a Perl ArrayRef of Strings, where every String contains a valid InfluxDB query.

If the returned object evaluates to true, indicating that the query was successful, then the returned object's "data" attribute contains the entire response from InfluxDB as Perl hash. Additionally the attribute "request_id" provides the request identifier as set in the HTTP reponse headers by InfluxDB. This can for example be useful for correlating requests with log files.

write measurement, database => "DATABASE", precision => "ns", retention_policy => "RP"

Writes data into InfluxDB. The parameter "measurement" can either be a String or an ArrayRef of Strings, where each String contains one valid InfluxDB LineProtocol statement. All of those mesaurements are then sent to InfluxDB and the specified database. The returned object evaluates to true if the write was successful, and otherwise to false.

The optional argument precision can be given if a precsion different than "ns" is used in the line protocol. InfluxDB docs suggest that using a coarser precision than ns can save space and processing. In many cases "s" or "m" might do.

The optional argument retention_policy can be used to specify a retention policy other than the default retention policy of the selected database.

get_lwp_useragent

Returns the internally used LWP::UserAgent instance for possible modifications (e.g. to configure an HTTP proxy).

License and copyright

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.