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prom_api.go
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prom_api.go
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package api
import (
"context"
"github.com/prometheus/client_golang/prometheus"
"net/http"
"time"
"github.com/cloudfoundry/metric-store-release/src/internal/rules"
"github.com/cloudfoundry/metric-store-release/src/pkg/logger"
"github.com/grafana/regexp"
"github.com/prometheus/common/route"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/storage"
prom_api "github.com/prometheus/prometheus/web/api/v1"
)
const (
REMOTE_READ_SAMPLE_LIMIT = 20000000
REMOTE_READ_CONCURRENCY_LIMIT = 50
REMOTE_READ_MAX_BYTES_IN_FRAME = 1048576 // 1MB recommended by protobuf
)
type PromAPI struct {
promQLEngine *promql.Engine
log *logger.Logger
}
func NewPromAPI(promQLEngine *promql.Engine, log *logger.Logger) *PromAPI {
return &PromAPI{
promQLEngine: promQLEngine,
log: log,
}
}
func (api *PromAPI) RouterForStorage(storage storage.Storage, ruleManager rules.RuleManager, gatherer prometheus.Gatherer, registerer prometheus.Registerer) *route.Router {
targetRetriever := func(context.Context) prom_api.TargetRetriever {
return &nullTargetRetriever{}
}
alertmanagerRetriever := func(context.Context) prom_api.AlertmanagerRetriever {
return ruleManager
}
rulesRetriever := func(context.Context) prom_api.RulesRetriever {
return ruleManager
}
nullDBDir := ""
prometheusVersion := &prom_api.PrometheusVersion{
Version: "2.14.0",
Revision: "edeb7a44cbf745f1d8be4ea6f215e79e651bfe19",
Branch: "v2.14.0",
BuildUser: "",
BuildDate: "",
GoVersion: "",
}
runtimeInfo := prom_api.RuntimeInfo{
StartTime: time.Now(),
CWD: "",
ReloadConfigSuccess: false,
LastConfigTime: time.Now(),
CorruptionCount: 0,
GoroutineCount: 0,
GOMAXPROCS: 0,
GOGC: "",
GODEBUG: "",
StorageRetention: "",
}
promAPI := prom_api.NewAPI(
api.promQLEngine,
storage,
storage,
nil,
nil,
targetRetriever,
alertmanagerRetriever,
func() config.Config { return config.Config{} },
nil,
prom_api.GlobalURLOptions{},
func(h http.HandlerFunc) http.HandlerFunc { return h },
&nullTSDBAdminStats{},
nullDBDir,
false,
api.log,
rulesRetriever,
REMOTE_READ_SAMPLE_LIMIT,
REMOTE_READ_CONCURRENCY_LIMIT,
REMOTE_READ_MAX_BYTES_IN_FRAME,
false,
®exp.Regexp{},
func() (prom_api.RuntimeInfo, error) { return runtimeInfo, nil },
prometheusVersion,
gatherer,
registerer,
nil,
)
promAPIRouter := route.New()
promAPI.Register(promAPIRouter)
return promAPIRouter
}