76 lines
1.4 KiB
Go
76 lines
1.4 KiB
Go
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package prometheus
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import (
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"errors"
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"os"
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"github.com/bdlm/log"
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"github.com/FreifunkBremen/yanic/output"
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"github.com/FreifunkBremen/yanic/runtime"
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)
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type Output struct {
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output.Output
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path string
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}
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type Config map[string]interface{}
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func (c Config) Path() string {
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if path, ok := c["path"]; ok {
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return path.(string)
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}
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return ""
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}
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func init() {
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output.RegisterAdapter("prometheus", Register)
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}
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func Register(configuration map[string]interface{}) (output.Output, error) {
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var config Config
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config = configuration
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if path := config.Path(); path != "" {
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return &Output{
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path: path,
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}, nil
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}
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return nil, errors.New("no path given")
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}
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func (o *Output) Save(nodes *runtime.Nodes) {
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nodes.RLock()
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defer nodes.RUnlock()
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tmpFile := o.path + ".tmp"
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f, err := os.OpenFile(tmpFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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log.Panic(err)
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}
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for _, node := range nodes.List {
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metrics := MetricsFromNode(nodes, node)
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for _, m := range metrics {
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str, err := m.String()
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if err == nil {
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f.WriteString(str + "\n")
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} else {
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logger := log.WithField("database", "prometheus")
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if nodeinfo := node.Nodeinfo; nodeinfo != nil {
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logger = logger.WithField("node_id", nodeinfo.NodeID)
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}
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logger.Warnf("not able to get metrics from node: %s", err)
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}
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}
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}
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f.Close()
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if err := os.Rename(tmpFile, o.path); err != nil {
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log.Panic(err)
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}
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}
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