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756985882a |
@@ -1,10 +1,8 @@
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package statusServer
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import (
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"context"
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"fmt"
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"net/http"
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"runtime"
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"strings"
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"time"
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@@ -97,56 +95,12 @@ func NewStatusServer(config models.Config) (*StatusServer, error) {
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return s, nil
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}
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// ServeHttp starts the HTTP server and continuously publishes runtime metrics
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// (memory allocation + GC count) to the "info" topic.
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//
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// ServeHttp starts the HTTP server
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// It blocks until the HTTP server stops. Resources are cleaned up on shutdown:
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// PubSub is closed and a shutdown message is logged.
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func (s *StatusServer) ServeHttp() error {
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s.log.Debug("ServeHttp", "start publishing runtime metrics (memory + GC count)")
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// create cancellable context for metrics goroutine
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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// metrics publisher goroutine
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go func() {
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for {
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var init bool
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var m runtime.MemStats
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var oldM uint64
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var oldGc uint32
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var info struct {
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Memory uint64 `json:"memory"`
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GC uint32 `json:"gc"`
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}
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ticker := time.NewTicker(500 * time.Millisecond)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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// stop publishing if context is canceled
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return
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case <-ticker.C:
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// read runtime memory statistics
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runtime.ReadMemStats(&m)
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info.GC = m.NumGC
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// publish only when values changed or first run
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if oldGc != m.NumGC || oldM != m.Alloc/1024 || !init {
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info.Memory = m.Alloc / 1024
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s.pubSub.Publish("info", info)
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oldGc = m.NumGC
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oldM = m.Alloc / 1024
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init = true
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}
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}
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}
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}
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}()
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// log startup
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s.log.Info("ServeHttp", fmt.Sprintf("start listening on %s:%d", s.Ip, s.Port))
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