forked from mirror/client_golang
85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package extraction
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import (
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"io"
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"time"
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"github.com/prometheus/client_golang/model"
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)
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// ProcessOptions dictates how the interpreted stream should be rendered for
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// consumption.
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type ProcessOptions struct {
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// Timestamp is added to each value from the stream that has no explicit
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// timestamp set.
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Timestamp model.Timestamp
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}
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// Ingester consumes result streams in whatever way is desired by the user.
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type Ingester interface {
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Ingest(model.Samples) error
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}
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// Processor is responsible for decoding the actual message responses from
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// stream into a format that can be consumed with the end result written
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// to the results channel.
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type Processor interface {
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// ProcessSingle treats the input as a single self-contained message body and
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// transforms it accordingly. It has no support for streaming.
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ProcessSingle(in io.Reader, out Ingester, o *ProcessOptions) error
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}
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// Helper function to convert map[string]string into LabelSet.
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//
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// NOTE: This should be deleted when support for go 1.0.3 is removed; 1.1 is
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// smart enough to unmarshal JSON objects into LabelSet directly.
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func labelSet(labels map[string]string) model.LabelSet {
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labelset := make(model.LabelSet, len(labels))
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for k, v := range labels {
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labelset[model.LabelName(k)] = model.LabelValue(v)
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}
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return labelset
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}
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// A basic interface only useful in testing contexts for dispensing the time
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// in a controlled manner.
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type instantProvider interface {
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// The current instant.
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Now() time.Time
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}
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// Clock is a simple means for fluently wrapping around standard Go timekeeping
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// mechanisms to enhance testability without compromising code readability.
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//
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// It is sufficient for use on bare initialization. A provider should be
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// set only for test contexts. When not provided, it emits the current
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// system time.
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type clock struct {
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// The underlying means through which time is provided, if supplied.
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Provider instantProvider
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}
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// Emit the current instant.
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func (t *clock) Now() time.Time {
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if t.Provider == nil {
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return time.Now()
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}
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return t.Provider.Now()
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}
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