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86 lines
2.3 KiB
86 lines
2.3 KiB
12 years ago
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// Copyright 2013 Prometheus Team
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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 retrieval
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import (
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"fmt"
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"net"
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"net/url"
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"time"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/model"
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"github.com/prometheus/prometheus/utility"
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)
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// TargetProvider encapsulates retrieving all targets for a job.
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type TargetProvider interface {
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// Retrieves the current list of targets for this provider.
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Targets() ([]Target, error)
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}
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type sdTargetProvider struct {
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job config.JobConfig
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targets []Target
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lastRefresh time.Time
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refreshInterval time.Duration
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}
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// Constructs a new sdTargetProvider for a job.
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func NewSdTargetProvider(job config.JobConfig) *sdTargetProvider {
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i, err := utility.StringToDuration(job.GetSdRefreshInterval())
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if err != nil {
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panic(fmt.Sprintf("illegal refresh duration string %s: %s", job.GetSdRefreshInterval(), err))
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}
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return &sdTargetProvider{
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job: job,
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refreshInterval: i,
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}
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}
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func (p *sdTargetProvider) Targets() ([]Target, error) {
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if time.Since(p.lastRefresh) > p.refreshInterval {
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return p.targets, nil
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}
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_, addrs, err := net.LookupSRV("", "", p.job.GetSdName())
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if err != nil {
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return nil, err
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}
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baseLabels := model.LabelSet{
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model.JobLabel: model.LabelValue(p.job.GetName()),
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}
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targets := make([]Target, 0, len(addrs))
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endpoint := &url.URL{
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Scheme: "http",
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Path: p.job.GetMetricsPath(),
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}
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for _, addr := range addrs {
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// Remove the final dot from rooted DNS names to make them look more usual.
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if addr.Target[len(addr.Target)-1] == '.' {
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addr.Target = addr.Target[:len(addr.Target)-1]
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}
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endpoint.Host = fmt.Sprintf("%s:%d", addr.Target, addr.Port)
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t := NewTarget(endpoint.String(), time.Second*5, baseLabels)
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targets = append(targets, t)
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}
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p.targets = targets
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return targets, nil
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}
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