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query.go
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query.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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
}