Previously, the proxy would only report the error code it received from
an InfluxDB instance. This also passes the error message returned by
InfluxDB through, so it appears in the Chronograf server logs as well as
in the response returned to the frontend by the proxy (making it visible
by inspecting the request in the network tab).
This moves the logger interface into the root package and makes the log
subpackage specific to logrus. Also this makes the Logger interface type
also return other Loggers, such that we can completely encapsulate
logrus.Loggers.
This adds the logrus package to facilitate structured logging. Logrus is
encapsulated in the log/ subpackage and currently used in the influx/
subpackage.
At @goller's recommendation, we're following @benbjohnson's advice laid
out here: https://github.com/benbjohnson/wtf/blob/master/errors.go and
moving errors to the top level package. This cleaned up some ugliness in
the tests where we needed to type assert.
If a request upstream is cancelled, we can propagate the cancellation
down to our queries to Influx using context's cancellation
functionality. This patch adds support for this.
This adds a simple HTTP influx client to fetch time series results. It
implements the TimeSeries interface. Also included is an implementation
of the mrfusion.Results interface that wraps results returned from the
influx client.
We only support HTTP connections (there's also a UDP influx client). We
also require that all Queries to Influx be fully-qualified--they should
include the database and retention policies in the query.
This also makes Resuls a json.Marshaler. In order to hand results back
to clients, we need to guarantee that those results can be serialized to
json in some form. json.Marshaller is just such a guarantee!
Chris Goller
Tim Raymond
gunnaraasen