forked from grafana/loki
/
request_handler.go
373 lines (306 loc) · 10.4 KB
/
request_handler.go
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package deletion
import (
"encoding/json"
"errors"
"fmt"
"math"
"net/http"
"net/url"
"sort"
"time"
"github.com/grafana/loki/pkg/util"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/grafana/dskit/tenant"
util_log "github.com/grafana/loki/pkg/util/log"
)
// DeleteRequestHandler provides handlers for delete requests
type DeleteRequestHandler struct {
deleteRequestsStore DeleteRequestsStore
metrics *deleteRequestHandlerMetrics
maxInterval time.Duration
}
// NewDeleteRequestHandler creates a DeleteRequestHandler
func NewDeleteRequestHandler(deleteStore DeleteRequestsStore, maxInterval time.Duration, registerer prometheus.Registerer) *DeleteRequestHandler {
deleteMgr := DeleteRequestHandler{
deleteRequestsStore: deleteStore,
maxInterval: maxInterval,
metrics: newDeleteRequestHandlerMetrics(registerer),
}
return &deleteMgr
}
// AddDeleteRequestHandler handles addition of a new delete request
func (dm *DeleteRequestHandler) AddDeleteRequestHandler(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
userID, err := tenant.TenantID(ctx)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
params := r.URL.Query()
query, err := query(params)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
startTime, err := startTime(params)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
endTime, err := endTime(params, startTime)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
interval, err := dm.interval(params, startTime, endTime)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
deleteRequests := shardDeleteRequestsByInterval(startTime, endTime, query, userID, interval)
createdDeleteRequests, err := dm.deleteRequestsStore.AddDeleteRequestGroup(ctx, deleteRequests)
if err != nil {
level.Error(util_log.Logger).Log("msg", "error adding delete request to the store", "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if len(createdDeleteRequests) == 0 {
level.Error(util_log.Logger).Log("msg", "zero delete requests created", "user", userID, "query", query)
http.Error(w, "Zero delete requests were created due to an internal error. Please contact support.", http.StatusInternalServerError)
return
}
level.Info(util_log.Logger).Log(
"msg", "delete request for user added",
"delete_request_id", createdDeleteRequests[0].RequestID,
"user", userID,
"query", query,
"interval", interval.String(),
)
dm.metrics.deleteRequestsReceivedTotal.WithLabelValues(userID).Inc()
w.WriteHeader(http.StatusNoContent)
}
func shardDeleteRequestsByInterval(startTime, endTime model.Time, query, userID string, interval time.Duration) []DeleteRequest {
deleteRequests := make([]DeleteRequest, 0, endTime.Sub(startTime)/interval)
for start := startTime; start.Before(endTime); start = start.Add(interval) + 1 {
end := start.Add(interval)
if end.After(endTime) {
end = endTime
}
deleteRequests = append(deleteRequests,
DeleteRequest{
StartTime: start,
EndTime: end,
Query: query,
UserID: userID,
})
}
return deleteRequests
}
func (dm *DeleteRequestHandler) interval(params url.Values, startTime, endTime model.Time) (time.Duration, error) {
qr := params.Get("max_interval")
if qr == "" {
if dm.maxInterval == 0 {
return endTime.Sub(startTime), nil
}
return min(endTime.Sub(startTime), dm.maxInterval), nil
}
interval, err := time.ParseDuration(qr)
if err != nil || interval < time.Second {
return 0, errors.New("invalid max_interval: valid time units are 's', 'm', 'h'")
}
if interval > dm.maxInterval && dm.maxInterval != 0 {
return 0, fmt.Errorf("max_interval can't be greater than %s", dm.maxInterval.String())
}
if interval > endTime.Sub(startTime) {
return 0, fmt.Errorf("max_interval can't be greater than the interval to be deleted (%s)", endTime.Sub(startTime))
}
return interval, nil
}
func min(a, b time.Duration) time.Duration {
if a < b {
return a
}
return b
}
// GetAllDeleteRequestsHandler handles get all delete requests
func (dm *DeleteRequestHandler) GetAllDeleteRequestsHandler(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
userID, err := tenant.TenantID(ctx)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
deleteGroups, err := dm.deleteRequestsStore.GetAllDeleteRequestsForUser(ctx, userID)
if err != nil {
level.Error(util_log.Logger).Log("msg", "error getting delete requests from the store", "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
deletesPerRequest := partitionByRequestID(deleteGroups)
deleteRequests := mergeDeletes(deletesPerRequest)
sort.Slice(deleteRequests, func(i, j int) bool {
return deleteRequests[i].CreatedAt < deleteRequests[j].CreatedAt
})
if err := json.NewEncoder(w).Encode(deleteRequests); err != nil {
level.Error(util_log.Logger).Log("msg", "error marshalling response", "err", err)
http.Error(w, fmt.Sprintf("Error marshalling response: %v", err), http.StatusInternalServerError)
}
}
func mergeDeletes(groups map[string][]DeleteRequest) []DeleteRequest {
mergedRequests := []DeleteRequest{} // Declare this way so the return value is [] rather than null
for _, deletes := range groups {
startTime, endTime, status := mergeData(deletes)
newDelete := deletes[0]
newDelete.StartTime = startTime
newDelete.EndTime = endTime
newDelete.Status = status
mergedRequests = append(mergedRequests, newDelete)
}
return mergedRequests
}
func mergeData(deletes []DeleteRequest) (model.Time, model.Time, DeleteRequestStatus) {
var (
startTime = model.Time(math.MaxInt64)
endTime = model.Time(0)
numProcessed = 0
)
for _, del := range deletes {
if del.StartTime < startTime {
startTime = del.StartTime
}
if del.EndTime > endTime {
endTime = del.EndTime
}
if del.Status == StatusProcessed {
numProcessed++
}
}
return startTime, endTime, deleteRequestStatus(numProcessed, len(deletes))
}
func deleteRequestStatus(processed, total int) DeleteRequestStatus {
if processed == 0 {
return StatusReceived
}
if processed == total {
return StatusProcessed
}
percentCompleted := float64(processed) / float64(total)
return DeleteRequestStatus(fmt.Sprintf("%d%% Complete", int(percentCompleted*100)))
}
// CancelDeleteRequestHandler handles delete request cancellation
func (dm *DeleteRequestHandler) CancelDeleteRequestHandler(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
userID, err := tenant.TenantID(ctx)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
params := r.URL.Query()
requestID := params.Get("request_id")
deleteRequests, err := dm.deleteRequestsStore.GetDeleteRequestGroup(ctx, userID, requestID)
if err != nil {
if errors.Is(err, ErrDeleteRequestNotFound) {
http.Error(w, "could not find delete request with given id", http.StatusNotFound)
return
}
level.Error(util_log.Logger).Log("msg", "error getting delete request from the store", "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
toDelete := filterProcessed(deleteRequests)
if len(toDelete) == 0 {
http.Error(w, "deletion of request which is in process or already processed is not allowed", http.StatusBadRequest)
return
}
if len(toDelete) != len(deleteRequests) && params.Get("force") != "true" {
http.Error(w, "Unable to cancel partially completed delete request. To force, use the ?force query parameter", http.StatusBadRequest)
return
}
if err := dm.deleteRequestsStore.RemoveDeleteRequests(ctx, toDelete); err != nil {
level.Error(util_log.Logger).Log("msg", "error cancelling the delete request", "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
}
func filterProcessed(reqs []DeleteRequest) []DeleteRequest {
var unprocessed []DeleteRequest
for _, r := range reqs {
if r.Status == StatusReceived {
unprocessed = append(unprocessed, r)
}
}
return unprocessed
}
// GetCacheGenerationNumberHandler handles requests for a user's cache generation number
func (dm *DeleteRequestHandler) GetCacheGenerationNumberHandler(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
userID, err := tenant.TenantID(ctx)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
cacheGenNumber, err := dm.deleteRequestsStore.GetCacheGenerationNumber(ctx, userID)
if err != nil {
level.Error(util_log.Logger).Log("msg", "error getting cache generation number", "err", err)
http.Error(w, fmt.Sprintf("error getting cache generation number %v", err), http.StatusInternalServerError)
return
}
if err := json.NewEncoder(w).Encode(cacheGenNumber); err != nil {
level.Error(util_log.Logger).Log("msg", "error marshalling response", "err", err)
http.Error(w, fmt.Sprintf("Error marshalling response: %v", err), http.StatusInternalServerError)
}
}
func query(params url.Values) (string, error) {
query := params.Get("query")
if len(query) == 0 {
return "", errors.New("query not set")
}
if _, err := parseDeletionQuery(query); err != nil {
return "", err
}
return query, nil
}
func startTime(params url.Values) (model.Time, error) {
startParam := params.Get("start")
if startParam == "" {
return 0, errors.New("start time not set")
}
st, err := parseTime(startParam)
if err != nil {
return 0, errors.New("invalid start time: require unix seconds or RFC3339 format")
}
return model.Time(st), nil
}
func endTime(params url.Values, startTime model.Time) (model.Time, error) {
endParam := params.Get("end")
endTime, err := parseTime(endParam)
if err != nil {
return 0, errors.New("invalid end time: require unix seconds or RFC3339 format")
}
if endTime > int64(model.Now()) {
return 0, errors.New("deletes in the future are not allowed")
}
if int64(startTime) > endTime {
return 0, errors.New("start time can't be greater than end time")
}
return model.Time(endTime), nil
}
func parseTime(in string) (int64, error) {
if in == "" {
return int64(model.Now()), nil
}
t, err := time.Parse(time.RFC3339, in)
if err != nil {
return timeFromInt(in)
}
return t.UnixMilli(), nil
}
func timeFromInt(in string) (int64, error) {
if len(in) != 10 {
return 0, errors.New("not unix seconds")
}
return util.ParseTime(in)
}