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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
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@@ -3,6 +3,7 @@ | |
| !.goxc.json | ||
| !.travis.yml | ||
| /build | ||
| /build-linux-*/ | ||
| /id | ||
| /pid | ||
| /wix/mackerel-agent.wxs | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| package command | ||
|
|
||
| import ( | ||
| "os" | ||
| "path/filepath" | ||
| "time" | ||
|
|
||
| "github.com/mackerelio/mackerel-agent/config" | ||
| "github.com/mackerelio/mackerel-agent/metadata" | ||
| ) | ||
|
|
||
| func metadataGenerators(conf *config.Config) []*metadata.Generator { | ||
| generators := make([]*metadata.Generator, 0, len(conf.MetadataPlugins)) | ||
|
|
||
| workdir := os.Getenv("MACKEREL_PLUGIN_WORKDIR") | ||
| if workdir == "" { | ||
| workdir = os.TempDir() | ||
| } | ||
|
|
||
| for name, pluginConfig := range conf.MetadataPlugins { | ||
| generator := &metadata.Generator{ | ||
| Name: name, | ||
| Config: pluginConfig, | ||
| Cachefile: filepath.Join(workdir, "mackerel-metadata", name), | ||
| } | ||
| logger.Debugf("Metadata plugin generator created: %#v %#v", generator, generator.Config) | ||
| generators = append(generators, generator) | ||
| } | ||
|
|
||
| return generators | ||
| } | ||
|
|
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| type metadataResult struct { | ||
| namespace string | ||
| metadata interface{} | ||
| createdAt time.Time | ||
| } | ||
|
|
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| func runMetadataLoop(c *Context, termMetadataCh <-chan struct{}, quit <-chan struct{}) { | ||
| resultCh := make(chan *metadataResult) | ||
| for _, g := range c.Agent.MetadataGenerators { | ||
| go runEachMetadataLoop(g, resultCh, quit) | ||
| } | ||
|
|
||
| exit := false | ||
| for !exit { | ||
| select { | ||
| case <-time.After(1 * time.Minute): | ||
| case <-termMetadataCh: | ||
| logger.Debugf("received 'term' chan for metadata loop") | ||
| exit = true | ||
| } | ||
|
|
||
| results := make(map[string]*metadataResult) | ||
| ConsumeResults: | ||
| for { | ||
| select { | ||
| case result := <-resultCh: | ||
| // prefer new result to avoid infinite number of retries | ||
| if prev, ok := results[result.namespace]; ok { | ||
| if result.createdAt.After(prev.createdAt) { | ||
| results[result.namespace] = result | ||
| } | ||
| } else { | ||
| results[result.namespace] = result | ||
| } | ||
| default: | ||
| break ConsumeResults | ||
| } | ||
| } | ||
|
|
||
| for _, result := range results { | ||
| resp, err := c.API.PutMetadata(c.Host.ID, result.namespace, result.metadata) | ||
| // retry on 5XX errors | ||
| if resp != nil && resp.StatusCode >= 500 { | ||
| logger.Errorf("put metadata %q failed: status %s", result.namespace, resp.Status) | ||
| go func() { | ||
| resultCh <- result | ||
| }() | ||
| continue | ||
| } | ||
| if err != nil { | ||
| logger.Errorf("put metadata %q failed: %v", result.namespace, err) | ||
| clearMetadataCache(c.Agent.MetadataGenerators, result.namespace) | ||
| continue | ||
| } | ||
| } | ||
| results = nil | ||
| } | ||
| } | ||
|
|
||
| func clearMetadataCache(generators []*metadata.Generator, namespace string) { | ||
| for _, g := range generators { | ||
| if g.Name == namespace { | ||
| g.Clear() | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func runEachMetadataLoop(g *metadata.Generator, resultCh chan<- *metadataResult, quit <-chan struct{}) { | ||
| interval := g.Interval() | ||
| nextInterval := 10 * time.Second | ||
| nextTime := time.Now() | ||
|
|
||
| for { | ||
| select { | ||
| case <-time.After(nextInterval): | ||
| metadata, err := g.Fetch() | ||
|
|
||
| // case for laptop sleep mode (now >> nextTime + interval) | ||
| now := time.Now() | ||
| nextInterval = interval - (now.Sub(nextTime) % interval) | ||
| nextTime = now.Add(nextInterval) | ||
|
|
||
| if err != nil { | ||
| logger.Warningf("metadata plugin %q: %s", g.Name, err.Error()) | ||
| continue | ||
| } | ||
|
|
||
| if !g.IsChanged(metadata) { | ||
| logger.Debugf("metadata plugin %q: metadata does not change", g.Name) | ||
| continue | ||
| } | ||
|
|
||
| if err := g.Save(metadata); err != nil { | ||
| logger.Warningf("metadata plugin %q: %s", g.Name, err.Error()) | ||
| continue | ||
| } | ||
|
|
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| logger.Debugf("metadata plugin %q: generated metadata (and saved cache to file: %s)", g.Name, g.Cachefile) | ||
| resultCh <- &metadataResult{ | ||
| namespace: g.Name, | ||
| metadata: metadata, | ||
| createdAt: time.Now(), | ||
| } | ||
|
|
||
| case <-quit: | ||
| return | ||
| } | ||
| } | ||
| } |
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