mirror of https://github.com/grafana/grafana.git
103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
package metrics
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import (
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"fmt"
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"regexp"
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"strings"
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"sync"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/grafana/grafana/pkg/api/response"
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contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
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apimodels "github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
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"github.com/grafana/grafana/pkg/web"
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)
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// OrgRegistries represents a map of registries per org.
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type OrgRegistries struct {
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regsMu sync.Mutex
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regs map[int64]prometheus.Registerer
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}
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func NewOrgRegistries() *OrgRegistries {
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return &OrgRegistries{
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regs: make(map[int64]prometheus.Registerer),
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}
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}
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// GetOrCreateOrgRegistry gets or creates a *prometheus.Registry for the specified org. It is safe to call concurrently.
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func (m *OrgRegistries) GetOrCreateOrgRegistry(orgID int64) prometheus.Registerer {
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m.regsMu.Lock()
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defer m.regsMu.Unlock()
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orgRegistry, ok := m.regs[orgID]
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if !ok {
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reg := prometheus.NewRegistry()
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m.regs[orgID] = reg
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return reg
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}
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return orgRegistry
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}
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// RemoveOrgRegistry removes the *prometheus.Registry for the specified org. It is safe to call concurrently.
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func (m *OrgRegistries) RemoveOrgRegistry(org int64) {
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m.regsMu.Lock()
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defer m.regsMu.Unlock()
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delete(m.regs, org)
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}
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// Instrument wraps a middleware, instrumenting the request latencies.
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func Instrument(
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method,
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path string,
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action func(*contextmodel.ReqContext) response.Response,
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metrics *API,
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) web.Handler {
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normalizedPath := MakeLabelValue(path)
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return func(c *contextmodel.ReqContext) {
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start := time.Now()
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res := action(c)
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// TODO: We could look up the datasource type via our datasource service
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var backend string
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datasourceID := web.Params(c.Req)[":DatasourceID"]
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if datasourceID == apimodels.GrafanaBackend.String() || datasourceID == "" {
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backend = GrafanaBackend
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} else {
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backend = ProxyBackend
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}
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ls := prometheus.Labels{
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"method": method,
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"route": normalizedPath,
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"status_code": fmt.Sprint(res.Status()),
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"backend": backend,
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}
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res.WriteTo(c)
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metrics.RequestDuration.With(ls).Observe(time.Since(start).Seconds())
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}
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}
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var invalidChars = regexp.MustCompile(`[^a-zA-Z0-9]+`)
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// MakeLabelValue normalizes a path template
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func MakeLabelValue(path string) string {
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// Convert non-alnums to underscores.
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result := invalidChars.ReplaceAllString(path, "_")
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// Trim leading and trailing underscores.
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result = strings.Trim(result, "_")
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// Make it all lowercase
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result = strings.ToLower(result)
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// Special case.
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if result == "" {
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result = "root"
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}
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return result
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}
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