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query.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
// Contributor:
// - Aaron Meihm [email protected]
package main
import (
"fmt"
elastigo "github.com/mattbaird/elastigo/lib"
"time"
)
type queryRequest struct {
startTime time.Time
endTime time.Time
}
func queryUsingPlugin(p plugin, req queryRequest) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("queryUsingPlugin() -> %v", e)
}
}()
template := `{
"size": 10000,
"query": {
"bool": {
"must": [
%v
],
"filter": {
"range": {
"utctimestamp": {
"gte": "%v",
"lt": "%v"
}
}
}
}
}
}`
// Add plugins search terms to the query
mult := false
temp := ""
if len(p.searchTerms) == 0 {
panic("plugin has no search terms defined")
}
for _, x := range p.searchTerms {
if mult {
temp += ","
}
termtemplate := `{
"term": {
"%v": "%v"
}
}`
termbuf := fmt.Sprintf(termtemplate, x.key, x.value)
temp += termbuf
mult = true
}
for _, x := range p.searchQS {
if mult {
temp += ","
}
qstemplate := `{
"query_string": {
"query": "%v"
}
}`
qsbuf := fmt.Sprintf(qstemplate, x)
temp += qsbuf
mult = true
}
querybuf := fmt.Sprintf(template, temp, req.startTime.Format(time.RFC3339), req.endTime.Format(time.RFC3339))
conn := elastigo.NewConn()
defer conn.Close()
conn.Domain = cfg.ES.EventESHost
res, err := conn.Search(cfg.ES.EventIndex, "", nil, querybuf)
if err != nil {
panic(err)
}
logf("plugin %v returned %v hits", p.name, res.Hits.Len())
if res.Hits.Len() == 0 {
return nil
}
pluginInput, err := pluginRequestDataFromES(res)
if err != nil {
panic(err)
}
err = p.runPlugin(pluginInput)
if err != nil {
panic(err)
}
return nil
}
func handleQueryRequest(q queryRequest) (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("handleQueryRequest() -> %v", e)
}
}()
logf("handling new query request")
// Execute a query for each registered plugin
for _, x := range pluginList {
err := queryUsingPlugin(x, q)
if err != nil {
panic(err)
}
}
return nil
}
func queryHandler(exitCh chan bool, notifyCh chan bool) {
defer func() {
if e := recover(); e != nil {
logf("queryHandler() -> %v", e)
}
logf("query handler exiting")
notifyCh <- true
}()
logf("query handler started")
for {
select {
case qr := <-queryRequestCh:
err := handleQueryRequest(qr)
if err != nil {
panic(err)
}
case <-exitCh:
return
}
}
}