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//
// sfive
//
// sfive - spreadspace streaming statistics suite is a generic
// statistic collection tool for streaming server infrastuctures.
// The system collects and stores meta data like number of views
// and throughput from a number of streaming servers and stores
// it in a global data store.
// The data acquisition is designed to be generic and extensible in
// order to support different streaming software.
// sfive also contains tools and applications to filter and visualize
// live and recorded data.
//
//
// Copyright (C) 2014-2017 Christian Pointner <equinox@spreadspace.org>
// Markus Grüneis <gimpf@gimpf.org>
//
// This file is part of sfive.
//
// sfive is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3
// as published by the Free Software Foundation.
//
// sfive is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with sfive. If not, see <http://www.gnu.org/licenses/>.
//
package sfive
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"strings"
"time"
)
const forwardEsLastUpdateIDJson = `{
"query": {"match": { "SourceHubUuid": "%s" } },
"aggregations": { "last-id" : { "max" : { "field": "SourceHubUpdateId" } } }
}`
func fwdEsGetLastUpdateID(baseUrl string, client *http.Client, hubUUID string) (lastID int, err error) {
url := baseUrl + "/dataupdate/_search?search_type=count"
queryJson := fmt.Sprintf(forwardEsLastUpdateIDJson, hubUUID)
s5dl.Printf("fwd-es: query: %s", queryJson)
var resp *http.Response
resp, err = client.Post(url, "application/json", strings.NewReader(queryJson))
if err != nil {
s5l.Printf("fwd-es: failed to query for lastupdate: %v\n", err)
return
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
s5l.Printf("fwd-es: server failed to fulfill query for lastupdate: %v\n", resp.StatusCode)
return
}
var body []byte
body, err = ioutil.ReadAll(resp.Body) // TODO: read from Body using json.Decoder
if err != nil {
s5l.Printf("fwd-es: failed to read lastupdate response: %v\n", err)
return
}
s5dl.Printf("fwd-es: lastupdate response: %s\n", body)
if len(body) == 0 {
lastID = -1
} else {
var value interface{}
err = json.Unmarshal(body, &value)
if err != nil {
s5l.Printf("fwd-es: invalid lastupdate response: %v\n", err)
return
}
idstrcntr := value.(map[string]interface{})["aggregations"].(map[string]interface{})["last-id"].(map[string]interface{})["value"]
if idstrcntr == nil {
s5l.Printf("fwd-es: we are new here\n")
lastID = -1
return
}
tid := idstrcntr.(float64)
lastID = int(tid)
}
return
}
func (srv Server) forwardEsRun(baseUrl string, client *http.Client) {
url := baseUrl + "/_bulk"
hubUUID := srv.store.GetHubUUID()
tryResync:
for {
lastID, err := fwdEsGetLastUpdateID(baseUrl, client, hubUUID)
if err != nil {
s5l.Printf("fwd-es: lastupdate returned err: %v", err)
time.Sleep(5 * time.Second)
continue tryResync
}
s5l.Printf("fwd-es: lastupdate: %d", lastID)
nextBatch:
for {
updates, err := srv.store.GetUpdatesAfter(lastID, 5000)
if err != nil {
s5l.Printf("fwd-es: failed reading updates: %v\n", err)
time.Sleep(500 * time.Millisecond)
continue nextBatch
}
if len(updates) == 0 {
time.Sleep(1 * time.Second)
continue nextBatch
}
postData := bytes.Buffer{}
for _, update := range updates {
data, err := json.Marshal(update) // TODO: move to seperate function, use StatelessEncoder and write to io.PipeWriter
if err != nil {
s5l.Panicf("fwd-es: encode failed: %v\n", err)
}
postData.WriteString(`{"index":{"_type":"dataupdate"}}`)
postData.WriteRune('\n')
postData.Write(data)
postData.WriteRune('\n')
}
// TODO: move to seperate function and use io.PipeReader as body
resp, err := client.Post(url, "application/json", bytes.NewReader(postData.Bytes()))
if err != nil {
s5l.Printf("fwd-es: post failed: %v\n", err)
time.Sleep(1 * time.Second)
continue tryResync
}
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
body, _ := ioutil.ReadAll(resp.Body)
s5l.Printf("fwd-es: post failed: %s\n%s\n", resp.Status, body)
time.Sleep(1 * time.Second)
continue tryResync
}
resp.Body.Close() // TODO: check result from elasticsearch
lastID = findMaxID(updates)
s5l.Printf("fwd-es: successfully forwarded %d updates, new lastid: %d", len(updates), lastID)
}
}
}
func (srv Server) RunForwardingEs(forwardBaseUrl string) {
srv.forwardEsRun(forwardBaseUrl, http.DefaultClient)
}
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