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client.go
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client.go
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package es
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"path"
"strconv"
"strings"
"time"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/tsdb"
"github.com/grafana/grafana/pkg/models"
"golang.org/x/net/context/ctxhttp"
)
const loggerName = "tsdb.elasticsearch.client"
var (
clientLog = log.New(loggerName)
)
var newDatasourceHttpClient = func(ds *models.DataSource) (*http.Client, error) {
return ds.GetHttpClient()
}
// Client represents a client which can interact with elasticsearch api
type Client interface {
GetVersion() int
GetTimeField() string
GetMinInterval(queryInterval string) (time.Duration, error)
ExecuteMultisearch(r *MultiSearchRequest) (*MultiSearchResponse, error)
MultiSearch() *MultiSearchRequestBuilder
}
// NewClient creates a new elasticsearch client
var NewClient = func(ctx context.Context, ds *models.DataSource, timeRange *tsdb.TimeRange) (Client, error) {
version, err := ds.JsonData.Get("esVersion").Int()
if err != nil {
return nil, fmt.Errorf("elasticsearch version is required, err=%v", err)
}
timeField, err := ds.JsonData.Get("timeField").String()
if err != nil {
return nil, fmt.Errorf("elasticsearch time field name is required, err=%v", err)
}
indexInterval := ds.JsonData.Get("interval").MustString()
ip, err := newIndexPattern(indexInterval, ds.Database)
if err != nil {
return nil, err
}
indices, err := ip.GetIndices(timeRange)
if err != nil {
return nil, err
}
clientLog.Debug("Creating new client", "version", version, "timeField", timeField, "indices", strings.Join(indices, ", "))
switch version {
case 2, 5, 56, 60:
return &baseClientImpl{
ctx: ctx,
ds: ds,
version: version,
timeField: timeField,
indices: indices,
timeRange: timeRange,
}, nil
}
return nil, fmt.Errorf("elasticsearch version=%d is not supported", version)
}
type baseClientImpl struct {
ctx context.Context
ds *models.DataSource
version int
timeField string
indices []string
timeRange *tsdb.TimeRange
}
func (c *baseClientImpl) GetVersion() int {
return c.version
}
func (c *baseClientImpl) GetTimeField() string {
return c.timeField
}
func (c *baseClientImpl) GetMinInterval(queryInterval string) (time.Duration, error) {
return tsdb.GetIntervalFrom(c.ds, simplejson.NewFromAny(map[string]interface{}{
"interval": queryInterval,
}), 5*time.Second)
}
func (c *baseClientImpl) getSettings() *simplejson.Json {
return c.ds.JsonData
}
type multiRequest struct {
header map[string]interface{}
body interface{}
interval tsdb.Interval
}
func (c *baseClientImpl) executeBatchRequest(uriPath string, requests []*multiRequest) (*http.Response, error) {
bytes, err := c.encodeBatchRequests(requests)
if err != nil {
return nil, err
}
return c.executeRequest(http.MethodPost, uriPath, bytes)
}
func (c *baseClientImpl) encodeBatchRequests(requests []*multiRequest) ([]byte, error) {
clientLog.Debug("Encoding batch requests to json", "batch requests", len(requests))
start := time.Now()
payload := bytes.Buffer{}
for _, r := range requests {
reqHeader, err := json.Marshal(r.header)
if err != nil {
return nil, err
}
payload.WriteString(string(reqHeader) + "\n")
reqBody, err := json.Marshal(r.body)
if err != nil {
return nil, err
}
body := string(reqBody)
body = strings.Replace(body, "$__interval_ms", strconv.FormatInt(r.interval.Milliseconds(), 10), -1)
body = strings.Replace(body, "$__interval", r.interval.Text, -1)
payload.WriteString(body + "\n")
}
elapsed := time.Since(start)
clientLog.Debug("Encoded batch requests to json", "took", elapsed)
return payload.Bytes(), nil
}
func (c *baseClientImpl) executeRequest(method, uriPath string, body []byte) (*http.Response, error) {
u, _ := url.Parse(c.ds.Url)
u.Path = path.Join(u.Path, uriPath)
var req *http.Request
var err error
if method == http.MethodPost {
req, err = http.NewRequest(http.MethodPost, u.String(), bytes.NewBuffer(body))
} else {
req, err = http.NewRequest(http.MethodGet, u.String(), nil)
}
if err != nil {
return nil, err
}
clientLog.Debug("Executing request", "url", req.URL.String(), "method", method)
req.Header.Set("User-Agent", "Grafana")
req.Header.Set("Content-Type", "application/json")
if c.ds.BasicAuth {
clientLog.Debug("Request configured to use basic authentication")
req.SetBasicAuth(c.ds.BasicAuthUser, c.ds.BasicAuthPassword)
}
if !c.ds.BasicAuth && c.ds.User != "" {
clientLog.Debug("Request configured to use basic authentication")
req.SetBasicAuth(c.ds.User, c.ds.Password)
}
httpClient, err := newDatasourceHttpClient(c.ds)
if err != nil {
return nil, err
}
start := time.Now()
defer func() {
elapsed := time.Since(start)
clientLog.Debug("Executed request", "took", elapsed)
}()
return ctxhttp.Do(c.ctx, httpClient, req)
}
func (c *baseClientImpl) ExecuteMultisearch(r *MultiSearchRequest) (*MultiSearchResponse, error) {
clientLog.Debug("Executing multisearch", "search requests", len(r.Requests))
multiRequests := c.createMultiSearchRequests(r.Requests)
res, err := c.executeBatchRequest("_msearch", multiRequests)
if err != nil {
return nil, err
}
clientLog.Debug("Received multisearch response", "code", res.StatusCode, "status", res.Status, "content-length", res.ContentLength)
start := time.Now()
clientLog.Debug("Decoding multisearch json response")
var msr MultiSearchResponse
defer res.Body.Close()
dec := json.NewDecoder(res.Body)
err = dec.Decode(&msr)
if err != nil {
return nil, err
}
elapsed := time.Since(start)
clientLog.Debug("Decoded multisearch json response", "took", elapsed)
msr.Status = res.StatusCode
return &msr, nil
}
func (c *baseClientImpl) createMultiSearchRequests(searchRequests []*SearchRequest) []*multiRequest {
multiRequests := []*multiRequest{}
for _, searchReq := range searchRequests {
mr := multiRequest{
header: map[string]interface{}{
"search_type": "query_then_fetch",
"ignore_unavailable": true,
"index": strings.Join(c.indices, ","),
},
body: searchReq,
interval: searchReq.Interval,
}
if c.version == 2 {
mr.header["search_type"] = "count"
}
if c.version >= 56 {
maxConcurrentShardRequests := c.getSettings().Get("maxConcurrentShardRequests").MustInt(256)
mr.header["max_concurrent_shard_requests"] = maxConcurrentShardRequests
}
multiRequests = append(multiRequests, &mr)
}
return multiRequests
}
func (c *baseClientImpl) MultiSearch() *MultiSearchRequestBuilder {
return NewMultiSearchRequestBuilder(c.GetVersion())
}