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proxy_query_service.go
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/
proxy_query_service.go
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package http
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"github.com/influxdata/flux"
"github.com/influxdata/flux/iocounter"
"github.com/influxdata/influxdb"
influxdbcontext "github.com/influxdata/influxdb/context"
"github.com/influxdata/influxdb/kit/check"
"github.com/influxdata/influxdb/kit/tracing"
"github.com/influxdata/influxdb/query"
"github.com/julienschmidt/httprouter"
"github.com/prometheus/client_golang/prometheus"
"go.uber.org/zap"
)
const (
proxyQueryPath = "/queryproxysvc"
QueryStatsTrailer = "Influx-Query-Statistics"
)
type ProxyQueryHandler struct {
*httprouter.Router
Logger *zap.Logger
Name string
ProxyQueryService query.ProxyQueryService
CompilerMappings flux.CompilerMappings
DialectMappings flux.DialectMappings
}
// NewProxyQueryHandler returns a new instance of ProxyQueryHandler.
func NewProxyQueryHandler(name string) *ProxyQueryHandler {
h := &ProxyQueryHandler{
Router: NewRouter(),
Name: name,
}
h.HandlerFunc("GET", "/ping", h.handlePing)
h.HandlerFunc("POST", proxyQueryPath, h.handlePostQuery)
return h
}
// handlePing returns a simple response to let the client know the server is running.
func (h *ProxyQueryHandler) handlePing(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusNoContent)
}
// HTTPDialect is an encoding dialect that can write metadata to HTTP headers
type HTTPDialect interface {
SetHeaders(w http.ResponseWriter)
}
// handlePostQuery handles query requests.
func (h *ProxyQueryHandler) handlePostQuery(w http.ResponseWriter, r *http.Request) {
const op = "http/handlePostQueryproxysvc"
ctx := r.Context()
var req query.ProxyRequest
req.WithCompilerMappings(h.CompilerMappings)
req.WithDialectMappings(h.DialectMappings)
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
err := &influxdb.Error{
Code: influxdb.EInvalid,
Msg: "failed to decode request body",
Op: op,
Err: err,
}
EncodeError(ctx, err, w)
return
}
if req.Request.Authorization == nil {
err := &influxdb.Error{
Code: influxdb.EUnauthorized,
Msg: "authorization is missing in the query request",
Op: op,
}
EncodeError(ctx, err, w)
return
}
ctx = influxdbcontext.SetAuthorizer(ctx, req.Request.Authorization)
w.Header().Set("Trailer", QueryStatsTrailer)
hd, ok := req.Dialect.(HTTPDialect)
if !ok {
err := &influxdb.Error{
Code: influxdb.EInvalid,
Msg: fmt.Sprintf("unsupported dialect over HTTP: %T", req.Dialect),
Op: op,
}
EncodeError(ctx, err, w)
return
}
hd.SetHeaders(w)
cw := iocounter.Writer{Writer: w}
stats, err := h.ProxyQueryService.Query(ctx, &cw, &req)
if err != nil {
if cw.Count() == 0 {
// Only record the error headers IFF nothing has been written to w.
err := &influxdb.Error{
Code: influxdb.EInternal,
Msg: "failed to execute query against proxy service",
Op: op,
Err: err,
}
EncodeError(ctx, err, w)
return
}
h.Logger.Info("Error writing response to client",
zap.String("handler", h.Name),
zap.Error(err),
)
return
}
// Write statistics trailer
data, err := json.Marshal(stats)
if err != nil {
h.Logger.Info("Failed to encode statistics", zap.Error(err))
return
}
w.Header().Set(QueryStatsTrailer, string(data))
}
// PrometheusCollectors satisifies the prom.PrometheusCollector interface.
func (h *ProxyQueryHandler) PrometheusCollectors() []prometheus.Collector {
// TODO: gather and return relevant metrics.
return nil
}
type ProxyQueryService struct {
Addr string
Token string
InsecureSkipVerify bool
}
func (s *ProxyQueryService) Check(ctx context.Context) check.Response {
resp := check.Response{Name: "Query Service"}
if err := s.Ping(ctx); err != nil {
resp.Status = check.StatusFail
resp.Message = err.Error()
} else {
resp.Status = check.StatusPass
}
return resp
}
// Ping checks to see if the server is responding to a ping request.
func (s *ProxyQueryService) Ping(ctx context.Context) error {
u, err := newURL(s.Addr, "/ping")
if err != nil {
return err
}
hreq, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return err
}
SetToken(s.Token, hreq)
hreq = hreq.WithContext(ctx)
hc := newClient(u.Scheme, s.InsecureSkipVerify)
resp, err := hc.Do(hreq)
if err != nil {
return err
}
return CheckError(resp)
}
func (s *ProxyQueryService) Query(ctx context.Context, w io.Writer, req *query.ProxyRequest) (flux.Statistics, error) {
span, ctx := tracing.StartSpanFromContext(ctx)
defer span.Finish()
u, err := newURL(s.Addr, proxyQueryPath)
if err != nil {
return flux.Statistics{}, tracing.LogError(span, err)
}
var body bytes.Buffer
if err := json.NewEncoder(&body).Encode(req); err != nil {
return flux.Statistics{}, tracing.LogError(span, err)
}
hreq, err := http.NewRequest("POST", u.String(), &body)
if err != nil {
return flux.Statistics{}, tracing.LogError(span, err)
}
hreq = hreq.WithContext(ctx)
tracing.InjectToHTTPRequest(span, hreq)
hc := newClient(u.Scheme, s.InsecureSkipVerify)
resp, err := hc.Do(hreq)
if err != nil {
return flux.Statistics{}, tracing.LogError(span, err)
}
defer resp.Body.Close()
if err := CheckError(resp); err != nil {
return flux.Statistics{}, tracing.LogError(span, err)
}
if _, err = io.Copy(w, resp.Body); err != nil {
return flux.Statistics{}, tracing.LogError(span, err)
}
data := []byte(resp.Trailer.Get(QueryStatsTrailer))
var stats flux.Statistics
if len(data) > 0 {
// FIXME(jsternberg): The queryd service always sends these,
// but envoy does not currently return them properly.
// https://github.com/influxdata/idpe/issues/2841
if err := json.Unmarshal(data, &stats); err != nil {
return stats, tracing.LogError(span, err)
}
}
return stats, nil
}