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loki.go
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loki.go
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package loki
import (
"flag"
"fmt"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
"google.golang.org/grpc"
"github.com/cortexproject/cortex/pkg/chunk"
"github.com/cortexproject/cortex/pkg/chunk/storage"
"github.com/cortexproject/cortex/pkg/ring"
"github.com/cortexproject/cortex/pkg/util"
"github.com/cortexproject/cortex/pkg/util/validation"
"github.com/weaveworks/common/middleware"
"github.com/weaveworks/common/server"
"github.com/grafana/loki/pkg/distributor"
"github.com/grafana/loki/pkg/ingester"
"github.com/grafana/loki/pkg/ingester/client"
"github.com/grafana/loki/pkg/querier"
loki_storage "github.com/grafana/loki/pkg/storage"
)
// Config is the root config for Loki.
type Config struct {
Target moduleName `yaml:"target,omitempty"`
AuthEnabled bool `yaml:"auth_enabled,omitempty"`
Server server.Config `yaml:"server,omitempty"`
Distributor distributor.Config `yaml:"distributor,omitempty"`
Querier querier.Config `yaml:"querier,omitempty"`
IngesterClient client.Config `yaml:"ingester_client,omitempty"`
Ingester ingester.Config `yaml:"ingester,omitempty"`
StorageConfig storage.Config `yaml:"storage_config,omitempty"`
ChunkStoreConfig chunk.StoreConfig `yaml:"chunk_store_config,omitempty"`
SchemaConfig chunk.SchemaConfig `yaml:"schema_config,omitempty"`
LimitsConfig validation.Limits `yaml:"limits_config,omitempty"`
TableManager chunk.TableManagerConfig `yaml:"table_manager,omitempty"`
}
// RegisterFlags registers flag.
func (c *Config) RegisterFlags(f *flag.FlagSet) {
c.Server.MetricsNamespace = "loki"
c.Target = All
c.Server.ExcludeRequestInLog = true
f.Var(&c.Target, "target", "target module (default All)")
f.BoolVar(&c.AuthEnabled, "auth.enabled", true, "Set to false to disable auth.")
c.Server.RegisterFlags(f)
c.Distributor.RegisterFlags(f)
c.Querier.RegisterFlags(f)
c.IngesterClient.RegisterFlags(f)
c.Ingester.RegisterFlags(f)
c.StorageConfig.RegisterFlags(f)
c.ChunkStoreConfig.RegisterFlags(f)
c.SchemaConfig.RegisterFlags(f)
c.LimitsConfig.RegisterFlags(f)
c.TableManager.RegisterFlags(f)
}
// Loki is the root datastructure for Loki.
type Loki struct {
cfg Config
server *server.Server
ring *ring.Ring
overrides *validation.Overrides
distributor *distributor.Distributor
ingester *ingester.Ingester
querier *querier.Querier
store loki_storage.Store
tableManager *chunk.TableManager
httpAuthMiddleware middleware.Interface
}
// New makes a new Loki.
func New(cfg Config) (*Loki, error) {
loki := &Loki{
cfg: cfg,
}
loki.setupAuthMiddleware()
if err := loki.init(cfg.Target); err != nil {
return nil, err
}
return loki, nil
}
func (t *Loki) setupAuthMiddleware() {
if t.cfg.AuthEnabled {
t.cfg.Server.GRPCMiddleware = []grpc.UnaryServerInterceptor{
middleware.ServerUserHeaderInterceptor,
}
t.cfg.Server.GRPCStreamMiddleware = []grpc.StreamServerInterceptor{
middleware.StreamServerUserHeaderInterceptor,
}
t.httpAuthMiddleware = middleware.AuthenticateUser
} else {
t.cfg.Server.GRPCMiddleware = []grpc.UnaryServerInterceptor{
fakeGRPCAuthUniaryMiddleware,
}
t.cfg.Server.GRPCStreamMiddleware = []grpc.StreamServerInterceptor{
fakeGRPCAuthStreamMiddleware,
}
t.httpAuthMiddleware = fakeHTTPAuthMiddleware
}
}
func (t *Loki) init(m moduleName) error {
// initialize all of our dependencies first
for _, dep := range orderedDeps(m) {
if err := t.initModule(dep); err != nil {
return err
}
}
// lastly, initialize the requested module
return t.initModule(m)
}
func (t *Loki) initModule(m moduleName) error {
level.Info(util.Logger).Log("msg", "initialising", "module", m)
if modules[m].init != nil {
if err := modules[m].init(t); err != nil {
return errors.Wrap(err, fmt.Sprintf("error initialising module: %s", m))
}
}
return nil
}
// Run starts Loki running, and blocks until a signal is received.
func (t *Loki) Run() error {
return t.server.Run()
}
// Stop gracefully stops a Loki.
func (t *Loki) Stop() error {
t.stopping(t.cfg.Target)
t.server.Shutdown()
t.stop(t.cfg.Target)
return nil
}
func (t *Loki) stop(m moduleName) {
t.stopModule(m)
deps := orderedDeps(m)
// iterate over our deps in reverse order and call stopModule
for i := len(deps) - 1; i >= 0; i-- {
t.stopModule(deps[i])
}
}
func (t *Loki) stopModule(m moduleName) {
level.Info(util.Logger).Log("msg", "stopping", "module", m)
if modules[m].stop != nil {
if err := modules[m].stop(t); err != nil {
level.Error(util.Logger).Log("msg", "error stopping", "module", m, "err", err)
}
}
}
func (t *Loki) stopping(m moduleName) {
t.stoppingModule(m)
deps := orderedDeps(m)
// iterate over our deps in reverse order and call stoppingModule
for i := len(deps) - 1; i >= 0; i-- {
t.stoppingModule(deps[i])
}
}
func (t *Loki) stoppingModule(m moduleName) {
level.Info(util.Logger).Log("msg", "notifying module about stopping", "module", m)
if modules[m].stopping != nil {
if err := modules[m].stopping(t); err != nil {
level.Error(util.Logger).Log("msg", "error stopping", "module", m, "err", err)
}
}
}