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http.go
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http.go
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package querier
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/weaveworks/common/httpgrpc/server"
"github.com/weaveworks/common/httpgrpc"
"github.com/cortexproject/cortex/pkg/util"
"github.com/go-kit/kit/log/level"
"github.com/gorilla/mux"
"github.com/gorilla/websocket"
"github.com/grafana/loki/pkg/logproto"
)
const (
defaultQueryLimit = 100
defaultSince = 1 * time.Hour
wsPingPeriod = 1 * time.Second
maxDelayForInTailing = 5
)
// nolint
func intParam(values url.Values, name string, def int) (int, error) {
value := values.Get(name)
if value == "" {
return def, nil
}
return strconv.Atoi(value)
}
func unixNanoTimeParam(values url.Values, name string, def time.Time) (time.Time, error) {
value := values.Get(name)
if value == "" {
return def, nil
}
nanos, err := strconv.ParseInt(value, 10, 64)
if err != nil {
if ts, err := time.Parse(time.RFC3339Nano, value); err == nil {
return ts, nil
}
return time.Time{}, err
}
return time.Unix(0, nanos), nil
}
// nolint
func directionParam(values url.Values, name string, def logproto.Direction) (logproto.Direction, error) {
value := values.Get(name)
if value == "" {
return def, nil
}
d, ok := logproto.Direction_value[strings.ToUpper(value)]
if !ok {
return logproto.FORWARD, fmt.Errorf("invalid direction '%s'", value)
}
return logproto.Direction(d), nil
}
func httpRequestToQueryRequest(httpRequest *http.Request) (*logproto.QueryRequest, error) {
params := httpRequest.URL.Query()
queryRequest := logproto.QueryRequest{
Regex: params.Get("regexp"),
Query: params.Get("query"),
}
var err error
queryRequest.Limit, queryRequest.Start, queryRequest.End, err = httpRequestToLookback(httpRequest)
if err != nil {
return nil, err
}
queryRequest.Direction, err = directionParam(params, "direction", logproto.BACKWARD)
if err != nil {
return nil, httpgrpc.Errorf(http.StatusBadRequest, err.Error())
}
return &queryRequest, nil
}
func httpRequestToTailRequest(httpRequest *http.Request) (*logproto.TailRequest, error) {
params := httpRequest.URL.Query()
tailRequest := logproto.TailRequest{
Regex: params.Get("regexp"),
Query: params.Get("query"),
}
var err error
tailRequest.Limit, tailRequest.Start, _, err = httpRequestToLookback(httpRequest)
if err != nil {
return nil, err
}
// delay_for is used to allow server to let slow loggers catch up.
// Entries would be accumulated in a heap until they become older than now()-<delay_for>
delayFor, err := intParam(params, "delay_for", 0)
if err != nil {
return nil, httpgrpc.Errorf(http.StatusBadRequest, err.Error())
}
tailRequest.DelayFor = uint32(delayFor)
return &tailRequest, nil
}
func httpRequestToLookback(httpRequest *http.Request) (limit uint32, start, end time.Time, err error) {
params := httpRequest.URL.Query()
now := time.Now()
lim, err := intParam(params, "limit", defaultQueryLimit)
if err != nil {
return 0, time.Now(), time.Now(), httpgrpc.Errorf(http.StatusBadRequest, err.Error())
}
limit = uint32(lim)
start, err = unixNanoTimeParam(params, "start", now.Add(-defaultSince))
if err != nil {
return 0, time.Now(), time.Now(), httpgrpc.Errorf(http.StatusBadRequest, err.Error())
}
end, err = unixNanoTimeParam(params, "end", now)
if err != nil {
return 0, time.Now(), time.Now(), httpgrpc.Errorf(http.StatusBadRequest, err.Error())
}
return
}
// QueryHandler is a http.HandlerFunc for queries.
func (q *Querier) QueryHandler(w http.ResponseWriter, r *http.Request) {
request, err := httpRequestToQueryRequest(r)
if err != nil {
server.WriteError(w, err)
return
}
level.Debug(util.Logger).Log("request", fmt.Sprintf("%+v", request))
result, err := q.Query(r.Context(), request)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if err := json.NewEncoder(w).Encode(result); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
// LabelHandler is a http.HandlerFunc for handling label queries.
func (q *Querier) LabelHandler(w http.ResponseWriter, r *http.Request) {
name, ok := mux.Vars(r)["name"]
params := r.URL.Query()
now := time.Now()
req := &logproto.LabelRequest{
Values: ok,
Name: name,
}
end, err := unixNanoTimeParam(params, "end", now)
if err != nil {
http.Error(w, httpgrpc.Errorf(http.StatusBadRequest, err.Error()).Error(), http.StatusBadRequest)
return
}
req.End = &end
start, err := unixNanoTimeParam(params, "start", end.Add(-6*time.Hour))
if err != nil {
http.Error(w, httpgrpc.Errorf(http.StatusBadRequest, err.Error()).Error(), http.StatusBadRequest)
return
}
req.Start = &start
resp, err := q.Label(r.Context(), req)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if err := json.NewEncoder(w).Encode(resp); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
// TailHandler is a http.HandlerFunc for handling tail queries.
func (q *Querier) TailHandler(w http.ResponseWriter, r *http.Request) {
upgrader := websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool { return true },
}
tailRequestPtr, err := httpRequestToTailRequest(r)
if err != nil {
server.WriteError(w, err)
return
}
if tailRequestPtr.DelayFor > maxDelayForInTailing {
server.WriteError(w, fmt.Errorf("delay_for can't be greater than %d", maxDelayForInTailing))
level.Error(util.Logger).Log("Error in upgrading websocket", fmt.Sprintf("%v", err))
return
}
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
level.Error(util.Logger).Log("Error in upgrading websocket", fmt.Sprintf("%v", err))
return
}
defer func() {
if err := conn.Close(); err != nil {
level.Error(util.Logger).Log("Error closing websocket", fmt.Sprintf("%v", err))
}
}()
// response from httpRequestToQueryRequest is a ptr, if we keep passing pointer down the call then it would stay on
// heap until connection to websocket stays open
tailRequest := *tailRequestPtr
tailer, err := q.Tail(r.Context(), &tailRequest)
if err != nil {
if err := conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())); err != nil {
level.Error(util.Logger).Log("Error connecting to ingesters for tailing", fmt.Sprintf("%v", err))
}
return
}
defer func() {
if err := tailer.close(); err != nil {
level.Error(util.Logger).Log("Error closing Tailer", fmt.Sprintf("%v", err))
}
}()
ticker := time.NewTicker(wsPingPeriod)
defer ticker.Stop()
var response *TailResponse
responseChan := tailer.getResponseChan()
closeErrChan := tailer.getCloseErrorChan()
for {
select {
case response = <-responseChan:
err := conn.WriteJSON(*response)
if err != nil {
level.Error(util.Logger).Log("Error writing to websocket", fmt.Sprintf("%v", err))
if err := conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())); err != nil {
level.Error(util.Logger).Log("Error writing close message to websocket", fmt.Sprintf("%v", err))
}
return
}
case err := <-closeErrChan:
level.Error(util.Logger).Log("Error from iterator", fmt.Sprintf("%v", err))
if err := conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())); err != nil {
level.Error(util.Logger).Log("Error writing close message to websocket", fmt.Sprintf("%v", err))
}
return
case <-ticker.C:
// This is to periodically check whether connection is active, useful to clean up dead connections when there are no entries to send
if err := conn.WriteMessage(websocket.PingMessage, nil); err != nil {
level.Error(util.Logger).Log("Error writing ping message to websocket", fmt.Sprintf("%v", err))
if err := conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseInternalServerErr, err.Error())); err != nil {
level.Error(util.Logger).Log("Error writing close message to websocket", fmt.Sprintf("%v", err))
}
return
}
}
}
}