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7cf87b230b
The module already called itself github.com/luxfi/node while containing no node in Go: cmd/luxd was twenty-one lines that printed the size of a few types, and the Go column of the matrix measured a VM plugin. A repo that fetches the thing it claims to be has not replaced it, so the Go sources move in — 1515 files, the daemon and everything under it — and the build reaches outside this module for nothing. Rust and C++ sit beside it unchanged and are still measured against it by the differential. That is the point of one repo: the reference implementation and the two ports are the same checkout, so parity is a thing you can run rather than a thing you assert. Verified: builds, and the closure carries no lux-private — checked at build time rather than believed. The daemon starts twelve chains on a local network (P X C Q Z A B G K M F, plus D through its plugin) and reports healthy.
104 lines
2.5 KiB
Go
104 lines
2.5 KiB
Go
// Copyright (C) 2019-2025, Lux Industries Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package metrics
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import (
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"errors"
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"fmt"
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"github.com/luxfi/metric"
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)
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var (
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_ MultiGatherer = (*prefixGatherer)(nil)
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errOverlappingNamespaces = errors.New("prefix could create overlapping namespaces")
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)
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// NewPrefixGatherer returns a new MultiGatherer that merges metrics by adding a
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// prefix to their names.
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func NewPrefixGatherer() MultiGatherer {
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return &prefixGatherer{}
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}
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type prefixGatherer struct {
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multiGatherer
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}
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func (g *prefixGatherer) Register(prefix string, gatherer metric.Gatherer) error {
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g.lock.Lock()
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defer g.lock.Unlock()
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for _, existingPrefix := range g.names {
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if eitherIsPrefix(prefix, existingPrefix) {
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return fmt.Errorf("%w: %q conflicts with %q",
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errOverlappingNamespaces,
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prefix,
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existingPrefix,
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)
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}
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}
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g.register(
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prefix,
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&prefixedGatherer{
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prefix: prefix,
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gatherer: gatherer,
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},
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)
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return nil
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}
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func (g *prefixGatherer) Deregister(prefix string) bool {
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g.lock.Lock()
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defer g.lock.Unlock()
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for i, existingPrefix := range g.names {
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if existingPrefix == prefix {
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// Remove the gatherer and prefix
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g.names = append(g.names[:i], g.names[i+1:]...)
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g.gatherers = append(g.gatherers[:i], g.gatherers[i+1:]...)
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return true
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}
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}
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return false
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}
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type prefixedGatherer struct {
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prefix string
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gatherer metric.Gatherer
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}
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func (g *prefixedGatherer) Gather() ([]*metric.MetricFamily, error) {
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// Gather returns partially filled metrics in the case of an error. So, it
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// is expected to still return the metrics in the case an error is returned.
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metricFamilies, err := g.gatherer.Gather()
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for _, metricFamily := range metricFamilies {
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originalName := metricFamily.Name
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if originalName == "" {
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// When the original name is empty, just use the prefix
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metricFamily.Name = g.prefix
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} else {
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metricFamily.Name = metric.AppendNamespace(g.prefix, originalName)
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}
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}
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return metricFamilies, err
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}
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// eitherIsPrefix returns true if either [a] is a prefix of [b] or [b] is a
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// prefix of [a].
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//
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// This function accounts for the usage of the namespace boundary, so "hello" is
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// not considered a prefix of "helloworld". However, "hello" is considered a
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// prefix of "hello_world".
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func eitherIsPrefix(a, b string) bool {
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if len(a) > len(b) {
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a, b = b, a
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}
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return a == b[:len(a)] && // a is a prefix of b
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(len(a) == 0 || // a is empty
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len(a) == len(b) || // a is equal to b
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b[len(a)] == metric.NamespaceSeparatorByte) // a ends at a namespace boundary of b
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}
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