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agenthttpcfg.go
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agenthttpcfg.go
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package gocbcore
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"sync/atomic"
"time"
)
type configStreamBlock struct {
Bytes []byte
}
func (i *configStreamBlock) UnmarshalJSON(data []byte) error {
i.Bytes = make([]byte, len(data))
copy(i.Bytes, data)
return nil
}
func hostnameFromUri(uri string) string {
uriInfo, err := url.Parse(uri)
if err != nil {
return uri
}
hostname, err := hostFromHostPort(uriInfo.Host)
if err != nil {
return uri
}
return hostname
}
func (agent *Agent) httpLooper(firstCfgFn func(*cfgBucket, string, error) bool) {
waitPeriod := agent.confHttpRetryDelay
maxConnPeriod := agent.confHttpRedialPeriod
var iterNum uint64 = 1
iterSawConfig := false
seenNodes := make(map[string]uint64)
isFirstTry := true
logDebugf("HTTP Looper starting.")
for {
routingInfo := agent.routingInfo.Get()
if routingInfo == nil {
// Shutdown the looper if the agent is shutdown
break
}
var pickedSrv string
for _, srv := range routingInfo.mgmtEpList {
if seenNodes[srv] >= iterNum {
continue
}
pickedSrv = srv
break
}
if pickedSrv == "" {
logDebugf("Pick Failed.")
// All servers have been visited during this iteration
if isFirstTry {
logDebugf("Could not find any alive http hosts.")
firstCfgFn(nil, "", ErrBadHosts)
break
}
if !iterSawConfig {
logDebugf("Looper waiting...")
// Wait for a period before trying again if there was a problem...
// We also watch for the client being shut down.
select {
case <-time.After(waitPeriod):
case <-agent.closeNotify:
}
}
logDebugf("Looping again.")
// Go to next iteration and try all servers again
iterNum++
iterSawConfig = false
continue
}
logDebugf("Http Picked: %s.", pickedSrv)
seenNodes[pickedSrv] = iterNum
hostname := hostnameFromUri(pickedSrv)
logDebugf("HTTP Hostname: %s.", hostname)
var resp *http.Response
// 1 on success, 0 on failure for node, -1 for generic failure
var doConfigRequest func(bool) int
doConfigRequest = func(is2x bool) int {
streamPath := "bs"
if is2x {
streamPath = "bucketsStreaming"
}
// HTTP request time!
uri := fmt.Sprintf("%s/pools/default/%s/%s", pickedSrv, streamPath, agent.bucket)
logDebugf("Requesting config from: %s.", uri)
req, err := http.NewRequest("GET", uri, nil)
if err != nil {
logDebugf("Failed to build HTTP config request. %v", err)
return 0
}
creds, err := getMgmtAuthCreds(agent.auth, pickedSrv)
if err != nil {
logDebugf("Failed to build get config credentials. %v", err)
return 0
}
req.SetBasicAuth(creds.Username, creds.Password)
resp, err = agent.httpCli.Do(req)
if err != nil {
logDebugf("Failed to connect to host. %v", err)
return 0
}
if resp.StatusCode != 200 {
if resp.StatusCode == 401 {
logDebugf("Failed to connect to host, bad auth.")
firstCfgFn(nil, "", ErrAuthError)
return -1
} else if resp.StatusCode == 404 {
if is2x {
logDebugf("Failed to connect to host, bad bucket.")
firstCfgFn(nil, "", ErrAuthError)
return -1
}
return doConfigRequest(true)
}
logDebugf("Failed to connect to host, unexpected status code: %v.", resp.StatusCode)
return 0
}
return 1
}
switch doConfigRequest(false) {
case 0:
continue
case -1:
break
}
logDebugf("Connected.")
var autoDisconnected int32
// Autodisconnect eventually
go func() {
select {
case <-time.After(maxConnPeriod):
case <-agent.closeNotify:
}
logDebugf("Automatically resetting our HTTP connection")
atomic.StoreInt32(&autoDisconnected, 1)
err := resp.Body.Close()
if err != nil {
logErrorf("Socket close failed during auto-dc (%s)", err)
}
}()
dec := json.NewDecoder(resp.Body)
configBlock := new(configStreamBlock)
for {
err := dec.Decode(configBlock)
if err != nil {
if atomic.LoadInt32(&autoDisconnected) == 1 {
// If we know we intentionally disconnected, we know we do not
// need to close the client, nor log an error, since this was
// expected behaviour
break
}
logWarnf("Config block decode failure (%s)", err)
if err != io.EOF {
err = resp.Body.Close()
if err != nil {
logErrorf("Socket close failed after decode fail (%s)", err)
}
}
break
}
logDebugf("Got Block: %v", string(configBlock.Bytes))
bkCfg, err := parseConfig(configBlock.Bytes, hostname)
if err != nil {
logDebugf("Got error while parsing config: %v", err)
err = resp.Body.Close()
if err != nil {
logErrorf("Socket close failed after parsing fail (%s)", err)
}
break
}
logDebugf("Got Config.")
iterSawConfig = true
if isFirstTry {
logDebugf("HTTP Config Init")
if !firstCfgFn(bkCfg, pickedSrv, nil) {
logDebugf("Got error while activating first config")
err = resp.Body.Close()
if err != nil {
logErrorf("Socket close failed after config init (%s)", err)
}
break
}
isFirstTry = false
} else {
logDebugf("HTTP Config Update")
agent.updateConfig(bkCfg)
}
}
logDebugf("HTTP, Setting %s to iter %d", pickedSrv, iterNum)
}
close(agent.httpLooperDoneSig)
}