diff options
Diffstat (limited to 'vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go')
| -rw-r--r-- | vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go | 31 |
1 files changed, 17 insertions, 14 deletions
diff --git a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go index b6dd5a2..2d67f24 100644 --- a/vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go +++ b/vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go @@ -11,21 +11,24 @@ // See the License for the specific language governing permissions and // limitations under the License. -// Copyright (c) 2013, The Prometheus Authors -// All rights reserved. +// Package promhttp provides tooling around HTTP servers and clients. // -// Use of this source code is governed by a BSD-style license that can be found -// in the LICENSE file. - -// Package promhttp contains functions to create http.Handler instances to -// expose Prometheus metrics via HTTP. In later versions of this package, it -// will also contain tooling to instrument instances of http.Handler and -// http.RoundTripper. +// First, the package allows the creation of http.Handler instances to expose +// Prometheus metrics via HTTP. promhttp.Handler acts on the +// prometheus.DefaultGatherer. With HandlerFor, you can create a handler for a +// custom registry or anything that implements the Gatherer interface. It also +// allows the creation of handlers that act differently on errors or allow to +// log errors. +// +// Second, the package provides tooling to instrument instances of http.Handler +// via middleware. Middleware wrappers follow the naming scheme +// InstrumentHandlerX, where X describes the intended use of the middleware. +// See each function's doc comment for specific details. // -// promhttp.Handler acts on the prometheus.DefaultGatherer. With HandlerFor, -// you can create a handler for a custom registry or anything that implements -// the Gatherer interface. It also allows to create handlers that act -// differently on errors or allow to log errors. +// Finally, the package allows for an http.RoundTripper to be instrumented via +// middleware. Middleware wrappers follow the naming scheme +// InstrumentRoundTripperX, where X describes the intended use of the +// middleware. See each function's doc comment for specific details. package promhttp import ( @@ -125,7 +128,7 @@ func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler { closer.Close() } if lastErr != nil && buf.Len() == 0 { - http.Error(w, "No metrics encoded, last error:\n\n"+err.Error(), http.StatusInternalServerError) + http.Error(w, "No metrics encoded, last error:\n\n"+lastErr.Error(), http.StatusInternalServerError) return } header := w.Header() |