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|
package sfive
import (
"bytes"
"encoding/json"
"io/ioutil"
"net/http"
"strconv"
"time"
)
func findMaxId(values []StatisticsData) int {
maxId := -1
for i := range values {
id := values[i].SourceHubDataUpdateId
if id != nil && *id > maxId {
maxId = *id
}
}
return maxId
}
func (self StatsSinkServer) getLastUpdate(baseurl string, client *http.Client) (latestId int, storeId string, err error) {
storeId, err = self.store.GetStoreId()
if err != nil {
s5l.Printf("fwd: failed to get own hubid: %v\n", err)
return
}
resp, err := client.Get(baseurl + "/lastupdate/" + storeId)
if err != nil {
s5l.Printf("fwd: failed to query for lastupdate: %v\n", err)
return
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
s5l.Printf("fwd: server failed to fulfill query for lastupdate: %v\n", resp.StatusCode)
return
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
s5l.Printf("fwd: failed to read lastupdate response: %v\n", err)
return
}
if len(body) == 0 {
latestId = -1
} else {
tid, errl := strconv.ParseInt(string(body), 10, 32)
if errl != nil {
s5l.Printf("fwd: invalid lastupdate response: %v\n", err)
err = errl
return
}
latestId = int(tid)
}
return
}
func (self StatsSinkServer) getUpdatesAfterInvoke(id int) (values []StatisticsData, err error) {
token := getUpdatesAfterToken{id: id, response: make(chan getUpdatesResult, 1)}
defer close(token.response)
self.getUpdatesAfterChan <- token
res := <-token.response
values = res.values
err = res.err
return
}
func (self StatsSinkServer) handleForwarding(baseurl string, client *http.Client) {
url := baseurl + "/updates"
tryResync:
for {
lastId, _, err := self.getLastUpdate(baseurl, client)
if err != nil {
s5l.Printf("fwd: lastupdate returned err: %v", err)
time.Sleep(5 * time.Second)
continue tryResync
}
s5l.Printf("fwd: lastupdate: %d", lastId)
nextBatch:
for {
updates, err := self.getUpdatesAfterInvoke(lastId)
if err != nil {
s5l.Printf("fwd: failed reading updates: %v\n", err)
time.Sleep(500 * time.Millisecond)
continue nextBatch
}
s5l.Printf("fwd: got %d updates", len(updates))
if len(updates) == 0 {
time.Sleep(1 * time.Second)
continue nextBatch
}
data, err := json.Marshal(StatisticsDataContainer{updates})
if err != nil {
s5l.Panicf("fwd: encode failed: %v\n", err)
}
s5l.Printf("fwd: marshal OK")
resp, err := client.Post(url, "application/json", bytes.NewBuffer(data))
if err != nil {
s5l.Printf("fwd: post failed: %v\n", err)
continue tryResync
// TODO retry etc.
}
resp.Body.Close()
if resp.StatusCode != http.StatusOK {
s5l.Printf("fwd: post failed: %s\n", resp.Status)
continue tryResync
}
// }
s5l.Printf("fwd: post OK")
lastId = findMaxId(updates)
s5l.Printf("fwd: new lastid: %d", lastId)
time.Sleep(1 * time.Second)
}
}
}
func (self StatsSinkServer) RunForwarding(forwardBaseUrl string) {
self.handleForwarding(forwardBaseUrl, http.DefaultClient)
}
|
