mirror of https://github.com/prometheus/prometheus
153 lines
4.8 KiB
Go
153 lines
4.8 KiB
Go
// 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 config
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import (
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"code.google.com/p/goprotobuf/proto"
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"fmt"
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"regexp"
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"time"
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clientmodel "github.com/prometheus/client_golang/model"
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pb "github.com/prometheus/prometheus/config/generated"
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"github.com/prometheus/prometheus/utility"
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)
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var jobNameRE = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_-]*$")
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var labelNameRE = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_]*$")
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// Config encapsulates the configuration of a Prometheus instance. It wraps the
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// raw configuration protocol buffer to be able to add custom methods to it.
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type Config struct {
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// The protobuf containing the actual configuration values.
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pb.PrometheusConfig
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}
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// String returns an ASCII serialization of the loaded configuration protobuf.
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func (c Config) String() string {
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return proto.MarshalTextString(&c.PrometheusConfig)
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}
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// validateLabels validates whether label names have the correct format.
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func (c Config) validateLabels(labels *pb.LabelPairs) error {
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if labels == nil {
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return nil
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}
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for _, label := range labels.Label {
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if !labelNameRE.MatchString(label.GetName()) {
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return fmt.Errorf("Invalid label name '%s'", label.GetName())
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}
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}
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return nil
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}
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// Validate checks an entire parsed Config for the validity of its fields.
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func (c Config) Validate() error {
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// Check the global configuration section for validity.
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global := c.Global
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if _, err := utility.StringToDuration(global.GetScrapeInterval()); err != nil {
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return fmt.Errorf("Invalid global scrape interval: %s", err)
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}
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if _, err := utility.StringToDuration(global.GetEvaluationInterval()); err != nil {
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return fmt.Errorf("Invalid rule evaluation interval: %s", err)
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}
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if err := c.validateLabels(global.Labels); err != nil {
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return fmt.Errorf("Invalid global labels: %s", err)
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}
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// Check each job configuration for validity.
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for _, job := range c.Job {
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if !jobNameRE.MatchString(job.GetName()) {
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return fmt.Errorf("Invalid job name '%s'", job.GetName())
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}
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if _, err := utility.StringToDuration(job.GetScrapeInterval()); err != nil {
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return fmt.Errorf("Invalid scrape interval for job '%s': %s", job.GetName(), err)
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}
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if _, err := utility.StringToDuration(job.GetSdRefreshInterval()); err != nil {
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return fmt.Errorf("Invalid SD refresh interval for job '%s': %s", job.GetName(), err)
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}
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for _, targetGroup := range job.TargetGroup {
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if err := c.validateLabels(targetGroup.Labels); err != nil {
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return fmt.Errorf("Invalid labels for job '%s': %s", job.GetName(), err)
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}
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}
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if job.SdName != nil && len(job.TargetGroup) > 0 {
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return fmt.Errorf("Specified both DNS-SD name and target group for job: %s", job.GetName())
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}
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}
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return nil
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}
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// GetJobByName finds a job by its name in a Config object.
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func (c Config) GetJobByName(name string) *JobConfig {
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for _, job := range c.Job {
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if job.GetName() == name {
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return &JobConfig{*job}
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}
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}
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return nil
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}
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// Return the global labels as a LabelSet.
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func (c Config) GlobalLabels() clientmodel.LabelSet {
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labels := clientmodel.LabelSet{}
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if c.Global.Labels != nil {
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for _, label := range c.Global.Labels.Label {
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labels[clientmodel.LabelName(label.GetName())] = clientmodel.LabelValue(label.GetValue())
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}
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}
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return labels
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}
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// Jobs returns all the jobs in a Config object.
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func (c Config) Jobs() (jobs []JobConfig) {
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for _, job := range c.Job {
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jobs = append(jobs, JobConfig{*job})
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}
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return
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}
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// stringToDuration converts a string to a duration and dies on invalid format.
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func stringToDuration(intervalStr string) time.Duration {
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duration, err := utility.StringToDuration(intervalStr)
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if err != nil {
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panic(err)
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}
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return duration
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}
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// ScrapeInterval gets the default scrape interval for a Config.
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func (c Config) ScrapeInterval() time.Duration {
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return stringToDuration(c.Global.GetScrapeInterval())
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}
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// EvaluationInterval gets the default evaluation interval for a Config.
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func (c Config) EvaluationInterval() time.Duration {
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return stringToDuration(c.Global.GetEvaluationInterval())
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}
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// JobConfig encapsulates the configuration of a single job. It wraps the raw
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// job protocol buffer to be able to add custom methods to it.
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type JobConfig struct {
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pb.JobConfig
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}
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// EvaluationInterval gets the scrape interval for a job.
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func (c JobConfig) ScrapeInterval() time.Duration {
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return stringToDuration(c.GetScrapeInterval())
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}
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