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Merge pull request #54 from SuperQ/config
Add support for targets from a config file
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| --- | ||
| linters-settings: | ||
| errcheck: | ||
| exclude: scripts/errcheck_excludes.txt |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| // Copyright 2021 Ben Kochie <superq@gmail.com> | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| package config | ||
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| import ( | ||
| "fmt" | ||
| "os" | ||
| "sync" | ||
| "time" | ||
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| yaml "gopkg.in/yaml.v2" | ||
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| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promauto" | ||
| ) | ||
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| const namespace = "smokeping_prober" | ||
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| var ( | ||
| configReloadSuccess = promauto.NewGauge(prometheus.GaugeOpts{ | ||
| Namespace: namespace, | ||
| Name: "config_last_reload_successful", | ||
| Help: "Blackbox exporter config loaded successfully.", | ||
| }) | ||
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| configReloadSeconds = promauto.NewGauge(prometheus.GaugeOpts{ | ||
| Namespace: namespace, | ||
| Name: "config_last_reload_success_timestamp_seconds", | ||
| Help: "Timestamp of the last successful configuration reload.", | ||
| }) | ||
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| // DefaultTargetGroup sets the default configuration for the TargetGroup | ||
| DefaultTargetGroup = TargetGroup{ | ||
| Interval: time.Second, | ||
| Network: "ip", | ||
| Protocol: "icmp", | ||
| } | ||
| ) | ||
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| type Config struct { | ||
| Targets []TargetGroup `yaml:"targets"` | ||
| } | ||
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| type SafeConfig struct { | ||
| sync.RWMutex | ||
| C *Config | ||
| } | ||
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| func (sc *SafeConfig) ReloadConfig(confFile string) (err error) { | ||
| var c = &Config{} | ||
| defer func() { | ||
| if err != nil { | ||
| configReloadSuccess.Set(0) | ||
| } else { | ||
| configReloadSuccess.Set(1) | ||
| configReloadSeconds.SetToCurrentTime() | ||
| } | ||
| }() | ||
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| yamlReader, err := os.Open(confFile) | ||
| if err != nil { | ||
| return fmt.Errorf("error reading config file: %w", err) | ||
| } | ||
| defer yamlReader.Close() | ||
| decoder := yaml.NewDecoder(yamlReader) | ||
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| if err = decoder.Decode(c); err != nil { | ||
| return fmt.Errorf("error parsing config file: %w", err) | ||
| } | ||
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| sc.Lock() | ||
| sc.C = c | ||
| sc.Unlock() | ||
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| return nil | ||
| } | ||
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| type TargetGroup struct { | ||
| Hosts []string `yaml:"hosts"` | ||
| Interval time.Duration `yaml:"interval,omitempty"` | ||
| Network string `yaml:"network,omitempty"` | ||
| Protocol string `yaml:"protocol,omitempty"` | ||
| // TODO: Needs work to fix MetricFamily consistency. | ||
| // Labels map[string]string `yaml:"labels,omitempty"` | ||
| } | ||
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| // UnmarshalYAML implements the yaml.Unmarshaler interface. | ||
| func (s *Config) UnmarshalYAML(unmarshal func(interface{}) error) error { | ||
| type plain Config | ||
| if err := unmarshal((*plain)(s)); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
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| // UnmarshalYAML implements the yaml.Unmarshaler interface. | ||
| func (s *TargetGroup) UnmarshalYAML(unmarshal func(interface{}) error) error { | ||
| *s = DefaultTargetGroup | ||
| type plain TargetGroup | ||
| if err := unmarshal((*plain)(s)); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| // Used in HTTP handlers, any error is handled by the server itself. | ||
| (net/http.ResponseWriter).Write | ||
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| // Never check for logger errors. | ||
| (github.com/go-kit/log.Logger).Log |
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