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be8801ab92
We use an LRU cache implementation that is keyed on strings, which avoids conversion to/from interface and the memory allocation that entails.
86 lines
2.8 KiB
Go
86 lines
2.8 KiB
Go
package render
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import (
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"regexp"
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"strings"
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"github.com/camlistore/camlistore/pkg/lru"
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"github.com/weaveworks/scope/probe/host"
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"github.com/weaveworks/scope/report"
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)
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var (
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// ServiceNodeIDPrefix is how the ID of all service pseudo nodes begin
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ServiceNodeIDPrefix = "service-"
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knownServiceMatcher = regexp.MustCompile(`^.+\.(` + strings.Join([]string{
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// See http://docs.aws.amazon.com/general/latest/gr/rande.html
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// for finer grained details
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`amazonaws\.com`,
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`googleapis\.com`,
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`core\.windows\.net`, // Azure Storage - Blob, Tables, Files & Queues
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`servicebus\.windows\.net`, // Azure Service Bus
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`azure-api\.net`, // Azure API Management
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`onmicrosoft\.com`, // Azure Active Directory
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`cloudapp\.azure\.com`, // Azure IaaS
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`database\.windows\.net`, // Azure SQL DB
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`documents\.azure\.com`, // Azure DocumentDB/CosmosDB
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}, `|`) + `)$`)
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knownServiceExcluder = regexp.MustCompile(`^(` + strings.Join([]string{
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// We exclude ec2 machines because they are too generic
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// and having separate nodes for them makes visualizations worse
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`ec2.*\.amazonaws\.com`,
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}, `|`) + `)$`)
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// Memoization for isKnownService.
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//
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// The 10000 comes from the observation that large reports contain
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// hundreds of names, and in a multi-tenant context we want to be
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// able to render a few dozen reports concurrently. Also, unlike
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// memoization in the reducers, which is keyed on reports, this
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// cache is effective when rendering multiple reports from the
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// same cluster of probes, e.g. from different points in time,
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// since names tend to change infrequently.
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//
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// Since names are generally <50 bytes, this shouldn't weight in
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// at more than a few MB of memory.
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knownServiceCache = lru.New(10000)
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)
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func purgeKnownServiceCache() {
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knownServiceCache = lru.New(10000)
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}
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// TODO: Make it user-customizable https://github.com/weaveworks/scope/issues/1876
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// NB: this is a hotspot in rendering performance.
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func isKnownService(hostname string) bool {
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if v, ok := knownServiceCache.Get(hostname); ok {
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return v.(bool)
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}
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known := knownServiceMatcher.MatchString(hostname) && !knownServiceExcluder.MatchString(hostname)
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knownServiceCache.Add(hostname, known)
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return known
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}
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// LocalNetworks returns a superset of the networks (think: CIDRs) that are
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// "local" from the perspective of each host represented in the report. It's
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// used to determine which nodes in the report are "remote", i.e. outside of
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// our infrastructure.
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func LocalNetworks(r report.Report) report.Networks {
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networks := report.MakeNetworks()
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for _, topology := range []report.Topology{r.Host, r.Overlay} {
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for _, md := range topology.Nodes {
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nets, _ := md.Sets.Lookup(host.LocalNetworks)
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for _, s := range nets {
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networks.AddCIDR(s)
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}
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}
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}
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return networks
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}
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