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query.go
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query.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package services
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"time"
"go.uber.org/zap"
ui "github.com/uber/jaeger/model/json"
)
// QueryService is the service used to query cassandra tables for traces
type QueryService interface {
GetTraces(serviceName, operation string, tags map[string]string) ([]*ui.Trace, error)
}
type queryService struct {
url string
logger *zap.Logger
}
// NewQueryService returns an instance of QueryService.
func NewQueryService(url string, logger *zap.Logger) QueryService {
return &queryService{
url: url,
logger: logger,
}
}
func getTraceURL(url string) string {
return url + "/api/traces?%s"
}
type response struct {
Data []*ui.Trace `json:"data"`
}
// GetTraces retrieves traces from the query service
func (s *queryService) GetTraces(serviceName, operation string, tags map[string]string) ([]*ui.Trace, error) {
endTimeMicros := time.Now().Unix() * int64(time.Second/time.Microsecond)
values := url.Values{}
values.Add("service", serviceName)
values.Add("operation", operation)
values.Add("end", strconv.FormatInt(endTimeMicros, 10))
for k, v := range tags {
values.Add("tag", k+":"+v)
}
resp, err := http.Get(fmt.Sprintf(getTraceURL(s.url), values.Encode()))
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, _ := ioutil.ReadAll(resp.Body)
s.logger.Info("Retrieved trace from query", zap.String("body", string(body)))
var queryResponse response
if err = json.Unmarshal(body, &queryResponse); err != nil {
return nil, err
}
return queryResponse.Data, nil
}