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api_metrics.go
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api_metrics.go
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package main
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"runtime"
"strings"
"sync"
"time"
"github.com/canonical/lxd/lxd/auth"
"github.com/canonical/lxd/lxd/db"
dbCluster "github.com/canonical/lxd/lxd/db/cluster"
"github.com/canonical/lxd/lxd/instance"
instanceDrivers "github.com/canonical/lxd/lxd/instance/drivers"
"github.com/canonical/lxd/lxd/instance/instancetype"
"github.com/canonical/lxd/lxd/locking"
"github.com/canonical/lxd/lxd/metrics"
"github.com/canonical/lxd/lxd/request"
"github.com/canonical/lxd/lxd/response"
"github.com/canonical/lxd/lxd/state"
"github.com/canonical/lxd/shared"
"github.com/canonical/lxd/shared/api"
"github.com/canonical/lxd/shared/entity"
"github.com/canonical/lxd/shared/logger"
)
type metricsCacheEntry struct {
metrics *metrics.MetricSet
expiry time.Time
}
var metricsCache map[string]metricsCacheEntry
var metricsCacheLock sync.Mutex
var metricsCmd = APIEndpoint{
Path: "metrics",
Get: APIEndpointAction{Handler: metricsGet, AccessHandler: allowMetrics, AllowUntrusted: true},
}
func allowMetrics(d *Daemon, r *http.Request) response.Response {
s := d.State()
if !s.GlobalConfig.MetricsAuthentication() {
return response.EmptySyncResponse
}
entityType := entity.TypeServer
// Check for individual permissions on project if set.
projectName := request.QueryParam(r, "project")
if projectName != "" {
entityType = entity.TypeProject
}
return allowPermission(entityType, auth.EntitlementCanViewMetrics)(d, r)
}
// swagger:operation GET /1.0/metrics metrics metrics_get
//
// Get metrics
//
// Gets metrics of instances.
//
// ---
// produces:
// - text/plain
// parameters:
// - in: query
// name: project
// description: Project name
// type: string
// example: default
// - in: query
// name: target
// description: Cluster member name
// type: string
// example: lxd01
// responses:
// "200":
// description: Metrics
// schema:
// type: string
// description: Instance metrics
// "403":
// $ref: "#/responses/Forbidden"
// "500":
// $ref: "#/responses/InternalServerError"
func metricsGet(d *Daemon, r *http.Request) response.Response {
s := d.State()
projectName := request.QueryParam(r, "project")
compress := strings.Contains(r.Header.Get("Accept-Encoding"), "gzip")
// Forward if requested.
resp := forwardedResponseIfTargetIsRemote(s, r)
if resp != nil {
return resp
}
// Wait until daemon is fully started.
<-d.waitReady.Done()
// Prepare response.
metricSet := metrics.NewMetricSet(nil)
var projectNames []string
var intMetrics *metrics.MetricSet
err := s.DB.Cluster.Transaction(r.Context(), func(ctx context.Context, tx *db.ClusterTx) error {
// Figure out the projects to retrieve.
if projectName != "" {
projectNames = []string{projectName}
} else {
// Get all project names if no specific project requested.
projects, err := dbCluster.GetProjects(ctx, tx.Tx())
if err != nil {
return fmt.Errorf("Failed loading projects: %w", err)
}
projectNames = make([]string, 0, len(projects))
for _, project := range projects {
projectNames = append(projectNames, project.Name)
}
}
// Register internal metrics.
intMetrics = internalMetrics(ctx, s.StartTime, tx)
return nil
})
if err != nil {
return response.SmartError(err)
}
// invalidProjectFilters returns project filters which are either not in cache or have expired.
invalidProjectFilters := func(projectNames []string) []dbCluster.InstanceFilter {
metricsCacheLock.Lock()
defer metricsCacheLock.Unlock()
var filters []dbCluster.InstanceFilter
for _, p := range projectNames {
projectName := p // Local var for filter pointer.
cache, ok := metricsCache[projectName]
if !ok || cache.expiry.Before(time.Now()) {
// If missing or expired, record it.
filters = append(filters, dbCluster.InstanceFilter{
Project: &projectName,
Node: &s.ServerName,
})
continue
}
// If present and valid, merge the existing data.
metricSet.Merge(cache.metrics)
}
return filters
}
// Review the cache for invalid projects.
projectsToFetch := invalidProjectFilters(projectNames)
// If all valid, return immediately.
if len(projectsToFetch) == 0 {
return getFilteredMetrics(s, r, compress, metricSet)
}
cacheDuration := time.Duration(8) * time.Second
// Acquire update lock.
lockCtx, lockCtxCancel := context.WithTimeout(r.Context(), cacheDuration)
defer lockCtxCancel()
unlock, err := locking.Lock(lockCtx, "metricsGet")
if err != nil {
return response.SmartError(api.StatusErrorf(http.StatusLocked, "Metrics are currently being built by another request: %s", err))
}
defer unlock()
// Setup a new response.
metricSet = metrics.NewMetricSet(nil)
// Check if any of the missing data has been filled in since acquiring the lock.
// As its possible another request was already populating the cache when we tried to take the lock.
projectsToFetch = invalidProjectFilters(projectNames)
// If all valid, return immediately.
if len(projectsToFetch) == 0 {
return getFilteredMetrics(s, r, compress, metricSet)
}
// Gather information about host interfaces once.
hostInterfaces, _ := net.Interfaces()
var instances []instance.Instance
err = s.DB.Cluster.Transaction(r.Context(), func(ctx context.Context, tx *db.ClusterTx) error {
return tx.InstanceList(ctx, func(dbInst db.InstanceArgs, p api.Project) error {
inst, err := instance.Load(s, dbInst, p)
if err != nil {
return fmt.Errorf("Failed loading instance %q in project %q: %w", dbInst.Name, dbInst.Project, err)
}
instances = append(instances, inst)
return nil
}, projectsToFetch...)
})
if err != nil {
return response.SmartError(err)
}
allProjectInstances := make(map[string]map[instancetype.Type]int)
// Total number of instances, both running and stopped.
for _, instance := range instances {
projectName := instance.Project().Name
_, ok := allProjectInstances[projectName]
if !ok {
allProjectInstances[projectName] = make(map[instancetype.Type]int)
}
allProjectInstances[projectName][instance.Type()]++
}
// Prepare temporary metrics storage.
newMetrics := make(map[string]*metrics.MetricSet, len(projectsToFetch))
newMetricsLock := sync.Mutex{}
// Limit metrics build concurrency to number of instances or number of CPU cores (which ever is less).
var wg sync.WaitGroup
instMetricsCh := make(chan instance.Instance)
maxConcurrent := runtime.NumCPU()
instCount := len(instances)
if instCount < maxConcurrent {
maxConcurrent = instCount
}
// Start metrics builder routines.
for i := 0; i < maxConcurrent; i++ {
go func(instMetricsCh <-chan instance.Instance) {
for inst := range instMetricsCh {
projectName := inst.Project().Name
instanceMetrics, err := inst.Metrics(hostInterfaces)
if err != nil && !errors.Is(err, instanceDrivers.ErrInstanceIsStopped) {
logger.Warn("Failed getting instance metrics", logger.Ctx{"instance": inst.Name(), "project": projectName, "err": err})
} else {
newMetricsLock.Lock()
// Initialise metrics set for project if needed.
// Do this even if the instance is stopped, otherwise the instance counter
// metrics won't be included if this is the only instance in the project.
// As won't be taken as a "new" metric when looping over newMetrics below.
if newMetrics[projectName] == nil {
newMetrics[projectName] = metrics.NewMetricSet(nil)
}
// Add the metrics if available.
if instanceMetrics != nil {
newMetrics[projectName].Merge(instanceMetrics)
}
newMetricsLock.Unlock()
}
wg.Done()
}
}(instMetricsCh)
}
// Fetch what's missing.
wg.Add(len(instances))
for _, inst := range instances {
instMetricsCh <- inst
}
wg.Wait()
close(instMetricsCh)
// Put the new data in the global cache and in response.
metricsCacheLock.Lock()
if metricsCache == nil {
metricsCache = map[string]metricsCacheEntry{}
}
// Add counter metrics for instances to the metric cache.
// We need to do create a distinct metric set for each project.
counterMetrics := make(map[string]*metrics.MetricSet, len(allProjectInstances))
for project, instanceCountMap := range allProjectInstances {
counterMetricSetPerProject := metrics.NewMetricSet(nil)
counterMetricSetPerProject.AddSamples(
metrics.Instances,
metrics.Sample{
Labels: map[string]string{"project": project, "type": instancetype.Container.String()},
Value: float64(instanceCountMap[instancetype.Container]),
},
)
counterMetricSetPerProject.AddSamples(
metrics.Instances,
metrics.Sample{
Labels: map[string]string{"project": project, "type": instancetype.VM.String()},
Value: float64(instanceCountMap[instancetype.VM]),
},
)
counterMetrics[project] = counterMetricSetPerProject
}
updatedProjects := []string{}
for project, entries := range newMetrics {
if project == api.ProjectDefaultName {
entries.Merge(intMetrics) // internal metrics are always considered new. Add them to the default project.
}
counterMetric, ok := counterMetrics[project]
if ok {
entries.Merge(counterMetric)
}
metricsCache[project] = metricsCacheEntry{
expiry: time.Now().Add(cacheDuration),
metrics: entries,
}
updatedProjects = append(updatedProjects, project)
metricSet.Merge(entries)
}
for _, project := range projectsToFetch {
if shared.ValueInSlice(*project.Project, updatedProjects) {
continue
}
metricsCache[*project.Project] = metricsCacheEntry{
expiry: time.Now().Add(cacheDuration),
}
}
metricsCacheLock.Unlock()
return getFilteredMetrics(s, r, compress, metricSet)
}
func getFilteredMetrics(s *state.State, r *http.Request, compress bool, metricSet *metrics.MetricSet) response.Response {
// Ignore filtering in case the authentication for metrics is disabled.
if !s.GlobalConfig.MetricsAuthentication() {
return response.SyncResponsePlain(true, compress, metricSet.String())
}
userHasProjectPermission, err := s.Authorizer.GetPermissionChecker(r.Context(), r, auth.EntitlementCanViewMetrics, entity.TypeProject)
if err != nil {
return response.SmartError(err)
}
userHasServerPermission, err := s.Authorizer.GetPermissionChecker(r.Context(), r, auth.EntitlementCanViewMetrics, entity.TypeServer)
if err != nil {
return response.SmartError(err)
}
// Filter all metrics for view permissions.
// Internal server metrics without labels are compared against the server entity.
metricSet.FilterSamples(func(labels map[string]string) bool {
if labels["project"] != "" {
return userHasProjectPermission(entity.ProjectURL(labels["project"]))
}
return userHasServerPermission(entity.ServerURL())
})
return response.SyncResponsePlain(true, compress, metricSet.String())
}
func internalMetrics(ctx context.Context, daemonStartTime time.Time, tx *db.ClusterTx) *metrics.MetricSet {
out := metrics.NewMetricSet(nil)
warnings, err := dbCluster.GetWarnings(ctx, tx.Tx())
if err != nil {
logger.Warn("Failed to get warnings", logger.Ctx{"err": err})
} else {
// Total number of warnings
out.AddSamples(metrics.WarningsTotal, metrics.Sample{Value: float64(len(warnings))})
}
operations, err := dbCluster.GetOperations(ctx, tx.Tx())
if err != nil {
logger.Warn("Failed to get operations", logger.Ctx{"err": err})
} else {
// Total number of operations
out.AddSamples(metrics.OperationsTotal, metrics.Sample{Value: float64(len(operations))})
}
// Daemon uptime
out.AddSamples(metrics.UptimeSeconds, metrics.Sample{Value: time.Since(daemonStartTime).Seconds()})
// Number of goroutines
out.AddSamples(metrics.GoGoroutines, metrics.Sample{Value: float64(runtime.NumGoroutine())})
// Go memory stats
var ms runtime.MemStats
runtime.ReadMemStats(&ms)
out.AddSamples(metrics.GoAllocBytes, metrics.Sample{Value: float64(ms.Alloc)})
out.AddSamples(metrics.GoAllocBytesTotal, metrics.Sample{Value: float64(ms.TotalAlloc)})
out.AddSamples(metrics.GoBuckHashSysBytes, metrics.Sample{Value: float64(ms.BuckHashSys)})
out.AddSamples(metrics.GoFreesTotal, metrics.Sample{Value: float64(ms.Frees)})
out.AddSamples(metrics.GoGCSysBytes, metrics.Sample{Value: float64(ms.GCSys)})
out.AddSamples(metrics.GoHeapAllocBytes, metrics.Sample{Value: float64(ms.HeapAlloc)})
out.AddSamples(metrics.GoHeapIdleBytes, metrics.Sample{Value: float64(ms.HeapIdle)})
out.AddSamples(metrics.GoHeapInuseBytes, metrics.Sample{Value: float64(ms.HeapInuse)})
out.AddSamples(metrics.GoHeapObjects, metrics.Sample{Value: float64(ms.HeapObjects)})
out.AddSamples(metrics.GoHeapReleasedBytes, metrics.Sample{Value: float64(ms.HeapReleased)})
out.AddSamples(metrics.GoHeapSysBytes, metrics.Sample{Value: float64(ms.HeapSys)})
out.AddSamples(metrics.GoLookupsTotal, metrics.Sample{Value: float64(ms.Lookups)})
out.AddSamples(metrics.GoMallocsTotal, metrics.Sample{Value: float64(ms.Mallocs)})
out.AddSamples(metrics.GoMCacheInuseBytes, metrics.Sample{Value: float64(ms.MCacheInuse)})
out.AddSamples(metrics.GoMCacheSysBytes, metrics.Sample{Value: float64(ms.MCacheSys)})
out.AddSamples(metrics.GoMSpanInuseBytes, metrics.Sample{Value: float64(ms.MSpanInuse)})
out.AddSamples(metrics.GoMSpanSysBytes, metrics.Sample{Value: float64(ms.MSpanSys)})
out.AddSamples(metrics.GoNextGCBytes, metrics.Sample{Value: float64(ms.NextGC)})
out.AddSamples(metrics.GoOtherSysBytes, metrics.Sample{Value: float64(ms.OtherSys)})
out.AddSamples(metrics.GoStackInuseBytes, metrics.Sample{Value: float64(ms.StackInuse)})
out.AddSamples(metrics.GoStackSysBytes, metrics.Sample{Value: float64(ms.StackSys)})
out.AddSamples(metrics.GoSysBytes, metrics.Sample{Value: float64(ms.Sys)})
return out
}