a.gritsenkoandClaude Sonnet 5
09159a5f31
Go service (nasmon/) plus nfpm packaging (packaging/), carried over from the home_nas monorepo. Adds rpm packaging alongside the existing deb build (Fedora/RHEL/Rocky dependency names via nfpm overrides, per-format systemd unit path, dpkg+rpm-compatible maintainer scripts) and a Gitea Actions workflow that builds both formats on every push. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
// Package history keeps a fixed-size in-memory ring of metric samples.
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package history
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import (
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"sync"
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"time"
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)
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type Sample struct {
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T int64 `json:"t"` // unix seconds
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CPU float64 `json:"cpu"`
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MemUsed uint64 `json:"mem_used"`
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ARC uint64 `json:"arc"`
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CPUTemp float64 `json:"cpu_temp"`
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}
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type Ring struct {
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mu sync.RWMutex
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buf []Sample
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head int
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n int
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}
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func New(size int) *Ring { return &Ring{buf: make([]Sample, size)} }
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func (r *Ring) Add(s Sample) {
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r.mu.Lock()
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defer r.mu.Unlock()
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r.buf[r.head] = s
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r.head = (r.head + 1) % len(r.buf)
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if r.n < len(r.buf) {
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r.n++
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}
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}
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// Since returns samples newer than t in chronological order, thinned to at
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// most maxPoints entries.
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func (r *Ring) Since(t time.Time, maxPoints int) []Sample {
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r.mu.RLock()
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defer r.mu.RUnlock()
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ts := t.Unix()
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out := make([]Sample, 0, r.n)
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start := (r.head - r.n + len(r.buf)) % len(r.buf)
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for i := 0; i < r.n; i++ {
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s := r.buf[(start+i)%len(r.buf)]
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if s.T >= ts {
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out = append(out, s)
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}
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}
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if maxPoints > 0 && len(out) > maxPoints {
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step := (len(out) + maxPoints - 1) / maxPoints
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thin := out[:0:0]
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for i := 0; i < len(out); i += step {
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thin = append(thin, out[i])
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}
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out = thin
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}
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return out
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}
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