open-consul/troubleshoot/proxy/stats.go

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package troubleshoot
import (
"encoding/json"
"fmt"
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envoy_admin_v3 "github.com/envoyproxy/go-control-plane/envoy/admin/v3"
"github.com/hashicorp/consul/troubleshoot/validate"
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)
type statsJson struct {
Stats []simpleMetric `json:"stats"`
}
type simpleMetric struct {
Value int64 `json:"value,omitempty"`
Name string `json:"name,omitempty"`
}
func (t *Troubleshoot) troubleshootStats() (validate.Messages, error) {
statMessages := validate.Messages{}
rejectionStats, err := t.getEnvoyStats("update_rejected")
if err != nil {
return nil, fmt.Errorf("could not get config rejection stats from envoy admin API: %w", err)
}
totalConfigRejections := 0
for _, rs := range rejectionStats {
if rs.Value != 0 {
totalConfigRejections += int(rs.Value)
}
}
if totalConfigRejections > 0 {
statMessages = append(statMessages, validate.Message{
Message: fmt.Sprintf("Envoy has %v rejected configurations", totalConfigRejections),
PossibleActions: []string{
"Check the logs of the Consul agent configuring the local proxy to see why Envoy rejected this configuration",
},
})
} else {
statMessages = append(statMessages, validate.Message{
Success: true,
Message: fmt.Sprintf("Envoy has %v rejected configurations", totalConfigRejections),
})
}
connectionFailureStats, err := t.getEnvoyStats("upstream_cx_connect_fail")
if err != nil {
return nil, fmt.Errorf("could not get connection failure stats from envoy admin API: %w", err)
}
totalCxFailures := 0
for _, cfs := range connectionFailureStats {
if cfs.Value != 0 {
totalCxFailures += int(cfs.Value)
}
}
statMessages = append(statMessages, validate.Message{
Success: true,
Message: fmt.Sprintf("Envoy has detected %v connection failure(s)", totalCxFailures),
})
return statMessages, nil
}
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func (t *Troubleshoot) getEnvoyStats(filter string) ([]*envoy_admin_v3.SimpleMetric, error) {
var resultErr error
jsonRaw, err := t.request(fmt.Sprintf("stats?format=json&filter=%s&type=Counters", filter))
if err != nil {
return nil, fmt.Errorf("error in requesting envoy Admin API /stats endpoint: %w", err)
}
var rawStats statsJson
err = json.Unmarshal(jsonRaw, &rawStats)
if err != nil {
return nil, fmt.Errorf("could not unmarshal /stats response: %w", err)
}
stats := []*envoy_admin_v3.SimpleMetric{}
for _, s := range rawStats.Stats {
stat := &envoy_admin_v3.SimpleMetric{
Value: uint64(s.Value),
Name: s.Name,
}
stats = append(stats, stat)
}
t.envoyStats = stats
return stats, resultErr
}