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tracepointService.go
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tracepointService.go
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/*
* Copyright (C) 2023 Intergral GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package tracepoint
import (
"context"
"fmt"
"sync"
tp "github.com/intergral/deep/pkg/deeppb/tracepoint/v1"
"github.com/intergral/deep/pkg/deepql"
gkLog "github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/dskit/ring"
"github.com/grafana/dskit/services"
"github.com/intergral/deep/modules/storage"
tp_store "github.com/intergral/deep/modules/tracepoint/store"
"github.com/intergral/deep/pkg/deeppb"
cp "github.com/intergral/deep/pkg/deeppb/common/v1"
"github.com/intergral/deep/pkg/util"
"github.com/intergral/deep/pkg/util/log"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
)
// ErrReadOnly is returned when we are shutting down
var ErrReadOnly = errors.New("tracepoint is shutting down")
const (
tracepointRingKey = "tpRing"
)
type TPService struct {
services.Service
deeppb.UnimplementedTracepointConfigServiceServer
instancesMtx sync.RWMutex
cfg Config
lifecycler *ring.Lifecycler
store *tp_store.TPStore
log gkLog.Logger
readonly bool
}
func (ts *TPService) Flush() {
err := ts.store.FlushAll(context.Background())
if err != nil {
level.Error(ts.log).Log("msg", "error flushing tracepoint store", "err", err)
}
}
func (ts *TPService) TransferOut(context.Context) error {
return ring.ErrTransferDisabled
}
// New will create a new TPService that handles reading and writing tracepoint changes to disk
func New(cfg Config, store storage.Store, logger gkLog.Logger, reg prometheus.Registerer) (*TPService, error) {
newStore, err := tp_store.NewStore(store)
if err != nil {
return nil, fmt.Errorf("cannot create new tracepoint store %w", err)
}
service := &TPService{
cfg: cfg,
store: newStore,
log: logger,
}
service.Service = services.NewBasicService(service.starting, service.running, service.stopping)
lc, err := ring.NewLifecycler(cfg.LifecyclerConfig, service, "tracepoint", cfg.OverrideRingKey, true, log.Logger, prometheus.WrapRegistererWithPrefix("deep_", reg))
if err != nil {
return nil, fmt.Errorf("NewLifecycler failed: %w", err)
}
service.lifecycler = lc
return service, nil
}
func (ts *TPService) starting(ctx context.Context) error {
// Important: we want to keep lifecycler running until we ask it to stop, so we need to give it independent context
if err := ts.lifecycler.StartAsync(context.Background()); err != nil {
return fmt.Errorf("failed to start lifecycler: %w", err)
}
if err := ts.lifecycler.AwaitRunning(ctx); err != nil {
return fmt.Errorf("failed to start lifecycle: %w", err)
}
return nil
}
func (ts *TPService) running(ctx context.Context) error {
select {
case <-ctx.Done():
return nil
}
}
func (ts *TPService) stopping(_ error) error {
if err := services.StopAndAwaitTerminated(context.Background(), ts.lifecycler); err != nil {
level.Warn(log.Logger).Log("msg", "failed to stop tracepoint lifecycler", "err", err)
}
ts.setReadOnly()
return nil
}
func (ts *TPService) setReadOnly() {
ts.instancesMtx.Lock()
defer ts.instancesMtx.Unlock()
ts.readonly = true
}
func (ts *TPService) LoadTracepoints(ctx context.Context, req *deeppb.LoadTracepointRequest) (*deeppb.LoadTracepointResponse, error) {
tenantID, err := util.ExtractTenantID(ctx)
if err != nil {
return nil, errors.Wrap(err, "error extracting tenant id in Tracepoint.LoadTracepoints")
}
attributes := make([]*cp.KeyValue, 0)
if req.Request.Resource != nil {
attributes = req.Request.Resource.Attributes
}
tpStore, err := ts.store.ForResource(ctx, tenantID, attributes)
if err != nil {
return nil, err
}
return tpStore.ProcessRequest(req)
}
func (ts *TPService) CreateTracepoint(ctx context.Context, req *deeppb.CreateTracepointRequest) (*deeppb.CreateTracepointResponse, error) {
if ts.readonly {
return nil, ErrReadOnly
}
tenantID, err := util.ExtractTenantID(ctx)
if err != nil {
return nil, errors.Wrap(err, "error extracting tenant id in Tracepoint.LoadTracepoints")
}
tpStore, err := ts.store.ForOrg(ctx, tenantID)
if err != nil {
return nil, err
}
err = tpStore.AddTracepoint(req.Tracepoint)
err = ts.store.Flush(ctx, tpStore)
return &deeppb.CreateTracepointResponse{}, nil
}
func (ts *TPService) DeleteTracepoint(ctx context.Context, req *deeppb.DeleteTracepointRequest) (*deeppb.DeleteTracepointResponse, error) {
if ts.readonly {
return nil, ErrReadOnly
}
tenantID, err := util.ExtractTenantID(ctx)
if err != nil {
return nil, errors.Wrap(err, "error extracting tenant id in Tracepoint.LoadTracepoints")
}
tpStore, err := ts.store.ForOrg(ctx, tenantID)
if err != nil {
return nil, err
}
err = tpStore.DeleteTracepoints(req.TracepointID)
err = ts.store.Flush(ctx, tpStore)
return &deeppb.DeleteTracepointResponse{}, nil
}
func (ts *TPService) ExecuteDeepQl(ctx context.Context, req *deeppb.DeepQlRequest) (*deeppb.DeepQlResponse, error) {
if ts.readonly {
return nil, ErrReadOnly
}
tenantID, err := util.ExtractTenantID(ctx)
if err != nil {
return nil, errors.Wrap(err, "error extracting tenant id in ExecuteDeepQl")
}
orgStore, err := ts.store.ForOrg(ctx, tenantID)
if err != nil {
return nil, err
}
expr, err := deepql.ParseString(req.Query)
if err != nil {
return nil, err
}
engine := deepql.NewEngine()
if expr.IsTrigger() {
affect, all, err := engine.ExecuteTriggerQuery(ctx, expr, func(ctx context.Context, request *deeppb.CreateTracepointRequest) (*tp.TracePointConfig, []*tp.TracePointConfig, error) {
tracepoint, err := ts.CreateTracepoint(ctx, request)
if err != nil {
return nil, nil, err
}
all, err := orgStore.LoadAll()
if err != nil {
return nil, nil, err
}
return tracepoint.Created, all, nil
})
if err != nil {
return nil, err
}
return &deeppb.DeepQlResponse{
All: all,
Affected: []*tp.TracePointConfig{
affect,
},
Type: "create",
}, nil
}
if expr.IsCommand() {
affect, all, commandType, err := engine.ExecuteCommandQuery(ctx, expr, func(ctx context.Context, request *deepql.CommandRequest) ([]*tp.TracePointConfig, []*tp.TracePointConfig, string, error) {
return ts.runQuery(orgStore, request)
})
if err != nil {
return nil, err
}
return &deeppb.DeepQlResponse{
All: all,
Affected: affect,
Type: commandType,
}, nil
}
return nil, errors.New("invalid query expression")
}
func (ts *TPService) runQuery(store tp_store.OrgTPStore, request *deepql.CommandRequest) ([]*tp.TracePointConfig, []*tp.TracePointConfig, string, error) {
tps, err := store.FindTracepoints(request)
if err != nil {
return nil, nil, request.Command, err
}
if request.Command == deepql.DeleteType {
ids := make([]string, len(tps))
for i, t := range tps {
ids[i] = t.ID
}
err := store.DeleteTracepoints(ids...)
if err != nil {
return nil, nil, request.Command, err
}
}
all, err := store.LoadAll()
if err != nil {
return nil, nil, request.Command, err
}
if len(tps) == 0 {
return nil, all, request.Command, nil
}
return tps, all, request.Command, nil
}