mirror of
https://github.com/hikhvar/mqtt2prometheus.git
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be4af9ff5e
This commit allows to extract the metric name from the topic path. Now it can be configured if all metrics are in a object in a certain topic or if every topic contains exactly one metric. However, currently these modes can not be mixed. This should solve !26 TODO: * Update documentation * Add unit tests
97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
package metrics
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import (
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"errors"
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"fmt"
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"github.com/hikhvar/mqtt2prometheus/pkg/config"
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"strconv"
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"time"
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)
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type metricNotConfiguredError error
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var metricNotConfigured metricNotConfiguredError = errors.New("metric not configured failed to parse")
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type Parser struct {
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metricConfigs map[string][]config.MetricConfig
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}
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func NewParser(metrics []config.MetricConfig) Parser {
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cfgs := make(map[string][]config.MetricConfig)
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for i := range metrics {
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key := metrics[i].MQTTName
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cfgs[key] = append(cfgs[key], metrics[i])
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}
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return Parser{
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metricConfigs: cfgs,
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}
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}
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// Config returns the underlying metrics config
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func (p *Parser) config() map[string][]config.MetricConfig {
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return p.metricConfigs
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}
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// validMetric returns config matching the metric and deviceID
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// Second return value indicates if config was found.
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func (p *Parser) validMetric(metric string, deviceID string) (config.MetricConfig, bool) {
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for _, c := range p.metricConfigs[metric] {
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if c.SensorNameFilter.Match(deviceID) {
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return c, true
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}
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}
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return config.MetricConfig{}, false
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}
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func (p *Parser) parseMetric(metricPath string, deviceID string, value interface{}) (Metric, error) {
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cfg, cfgFound := p.validMetric(metricPath, deviceID)
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if !cfgFound {
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return Metric{}, metricNotConfigured
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}
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var metricValue float64
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if boolValue, ok := value.(bool); ok {
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if boolValue {
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metricValue = 1
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} else {
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metricValue = 0
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}
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} else if strValue, ok := value.(string); ok {
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// If string value mapping is defined, use that
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if cfg.StringValueMapping != nil {
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floatValue, ok := cfg.StringValueMapping.Map[strValue]
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if ok {
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metricValue = floatValue
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} else if cfg.StringValueMapping.ErrorValue != nil {
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metricValue = *cfg.StringValueMapping.ErrorValue
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} else {
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return Metric{}, fmt.Errorf("got unexpected string data '%s'", strValue)
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}
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} else {
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// otherwise try to parse float
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floatValue, err := strconv.ParseFloat(strValue, 64)
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if err != nil {
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return Metric{}, fmt.Errorf("got data with unexpectd type: %T ('%s') and failed to parse to float", value, value)
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}
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metricValue = floatValue
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}
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} else if floatValue, ok := value.(float64); ok {
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metricValue = floatValue
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} else {
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return Metric{}, fmt.Errorf("got data with unexpectd type: %T ('%s')", value, value)
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}
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return Metric{
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Description: cfg.PrometheusDescription(),
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Value: metricValue,
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ValueType: cfg.PrometheusValueType(),
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IngestTime: time.Now(),
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}, nil
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}
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