forked from coinbase/mongobetween
/
topology_monitor.go
74 lines (65 loc) · 1.83 KB
/
topology_monitor.go
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package mongo
import (
"fmt"
"sort"
"time"
"go.mongodb.org/mongo-driver/mongo/description"
"go.mongodb.org/mongo-driver/x/mongo/driver/topology"
"go.uber.org/zap"
)
func topologyMonitor(log *zap.Logger, t *topology.Topology) {
last := t.Description()
for {
time.Sleep(5 * time.Second)
desc := t.Description()
if !topologyDescriptionEqual(&last, &desc) {
log.Info("Topology changed", topologyChangedFields(&last, &desc)...)
}
last = desc
}
}
func topologyChangedFields(last, desc *description.Topology) (fields []zap.Field) {
fields = append(fields, zap.String("old_kind", last.Kind.String()))
fields = append(fields, zap.String("new_kind", desc.Kind.String()))
lastServers := sortServers(last.Servers)
descServers := sortServers(desc.Servers)
for i, s := range lastServers {
fields = append(fields, zap.String(fmt.Sprintf("old_address_%d", i), s.Addr.String()))
fields = append(fields, zap.String(fmt.Sprintf("old_kind_%d", i), s.Kind.String()))
}
for i, s := range descServers {
fields = append(fields, zap.String(fmt.Sprintf("new_address_%d", i), s.Addr.String()))
fields = append(fields, zap.String(fmt.Sprintf("new_kind_%d", i), s.Kind.String()))
}
return
}
func sortServers(s []description.Server) []description.Server {
r := make([]description.Server, len(s))
copy(r, s)
sort.Slice(r, func(i, j int) bool {
return r[i].Addr < r[j].Addr
})
return r
}
func topologyDescriptionEqual(d1, d2 *description.Topology) bool {
if d1.Kind != d2.Kind {
return false
}
s1 := make(map[string]description.ServerKind)
s2 := make(map[string]description.ServerKind)
for _, s := range d1.Servers {
s1[s.Addr.String()] = s.Kind
}
for _, s := range d2.Servers {
s2[s.Addr.String()] = s.Kind
}
if len(s1) != len(s2) {
return false
}
for k, v := range s1 {
if s2[k] != v {
return false
}
}
return true
}