// Goroutine that forwards Upr events from a single node's feed to the aggregate feed.
func (feed *UprFeed) forwardUprEvents(nodeFeed *FeedInfo, killSwitch chan bool, host string) {
singleFeed := nodeFeed.uprFeed
defer func() {
feed.wg.Done()
if r := recover(); r != nil {
//if feed is not closing, re-throw the panic
if feed.outputClosed != true && feed.closing != true {
panic(r)
} else {
logging.Errorf("Panic is recovered. Since feed is closed, exit gracefully")
}
}
}()
for {
select {
case <-nodeFeed.quit:
nodeFeed.connected = false
return
case event, ok := <-singleFeed.C:
if !ok {
if singleFeed.Error != nil {
logging.Errorf("go-couchbase: Upr feed from %s failed: %v", host, singleFeed.Error)
}
killSwitch <- true
return
}
if feed.outputClosed == true {
// someone closed the node feed
logging.Infof("Node need closed, returning from forwardUprEvent")
return
}
feed.output <- event
if event.Status == gomemcached.NOT_MY_VBUCKET {
logging.Infof(" Got a not my vbucket error !! ")
if err := feed.bucket.Refresh(); err != nil {
logging.Errorf("Unable to refresh bucket %s ", err.Error())
feed.closeNodeFeeds()
return
}
// this will only connect to nodes that are not connected or changed
// user will have to reconnect the stream
if err := feed.connectToNodes(); err != nil {
logging.Errorf("Unable to connect to nodes %s", err.Error())
return
}
}
}
}
}
// PutDDoc installs a design document.
func (b *Bucket) PutDDoc(docname string, value interface{}) error {
var Err error
maxRetries, err := b.getMaxRetries()
if err != nil {
return err
}
lastNode := START_NODE_ID
for retryCount := 0; retryCount < maxRetries; retryCount++ {
Err = nil
ddocU, selectedNode, err := b.ddocURLNext(lastNode, docname)
if err != nil {
return err
}
lastNode = selectedNode
logging.Infof(" Trying with selected node %d", selectedNode)
j, err := json.Marshal(value)
if err != nil {
return err
}
req, err := http.NewRequest("PUT", ddocU, bytes.NewReader(j))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
err = maybeAddAuth(req, b.authHandler(false /* bucket not yet locked */))
if err != nil {
return err
}
res, err := doHTTPRequest(req)
if err != nil {
return err
}
if res.StatusCode != 201 {
body, _ := ioutil.ReadAll(res.Body)
Err = fmt.Errorf("error installing view: %v / %s",
res.Status, body)
logging.Errorf(" Error in PutDDOC %v. Retrying...", Err)
res.Body.Close()
b.Refresh()
continue
}
res.Body.Close()
break
}
return Err
}
// GetDDoc retrieves a specific a design doc.
func (b *Bucket) GetDDoc(docname string, into interface{}) error {
var Err error
var res *http.Response
maxRetries, err := b.getMaxRetries()
if err != nil {
return err
}
lastNode := START_NODE_ID
for retryCount := 0; retryCount < maxRetries; retryCount++ {
Err = nil
ddocU, selectedNode, err := b.ddocURLNext(lastNode, docname)
if err != nil {
return err
}
lastNode = selectedNode
logging.Infof(" Trying with selected node %d", selectedNode)
req, err := http.NewRequest("GET", ddocU, nil)
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
err = maybeAddAuth(req, b.authHandler(false /* bucket not yet locked */))
if err != nil {
return err
}
res, err = doHTTPRequest(req)
if err != nil {
return err
}
if res.StatusCode != 200 {
body, _ := ioutil.ReadAll(res.Body)
Err = fmt.Errorf("error reading view: %v / %s",
res.Status, body)
logging.Errorf(" Error in GetDDOC %v Retrying...", Err)
b.Refresh()
res.Body.Close()
continue
}
defer res.Body.Close()
break
}
if Err != nil {
return Err
}
d := json.NewDecoder(res.Body)
return d.Decode(into)
}
func (b *Bucket) RunBucketUpdater(notify NotifyFn) {
go func() {
err := b.UpdateBucket()
if err != nil {
if notify != nil {
notify(b.GetName(), err)
}
logging.Errorf(" Bucket Updater exited with err %v", err)
}
}()
}
func (feed *TapFeed) connectToNodes() (killSwitch chan bool, err error) {
killSwitch = make(chan bool)
for _, serverConn := range feed.bucket.getConnPools(false /* not already locked */) {
var singleFeed *memcached.TapFeed
singleFeed, err = serverConn.StartTapFeed(feed.args)
if err != nil {
logging.Errorf("go-couchbase: Error connecting to tap feed of %s: %v", serverConn.host, err)
feed.closeNodeFeeds()
return
}
feed.nodeFeeds = append(feed.nodeFeeds, singleFeed)
go feed.forwardTapEvents(singleFeed, killSwitch, serverConn.host)
feed.wg.Add(1)
}
return
}
// Goroutine that forwards Tap events from a single node's feed to the aggregate feed.
func (feed *TapFeed) forwardTapEvents(singleFeed *memcached.TapFeed, killSwitch chan bool, host string) {
defer feed.wg.Done()
for {
select {
case event, ok := <-singleFeed.C:
if !ok {
if singleFeed.Error != nil {
logging.Errorf("go-couchbase: Tap feed from %s failed: %v", host, singleFeed.Error)
}
killSwitch <- true
return
}
feed.output <- event
case <-feed.quit:
return
}
}
}
func (feed *UprFeed) connectToNodes() (err error) {
nodeCount := 0
for _, serverConn := range feed.bucket.getConnPools(false /* not already locked */) {
// this maybe a reconnection, so check if the connection to the node
// already exists. Connect only if the node is not found in the list
// or connected == false
nodeFeed := feed.nodeFeeds[serverConn.host]
if nodeFeed != nil && nodeFeed.connected == true {
continue
}
var singleFeed *memcached.UprFeed
var name string
if feed.name == "" {
name = "DefaultUprClient"
} else {
name = feed.name
}
singleFeed, err = serverConn.StartUprFeed(name, feed.sequence, feed.dcp_buffer_size, feed.data_chan_size)
if err != nil {
logging.Errorf("go-couchbase: Error connecting to upr feed of %s: %v", serverConn.host, err)
feed.closeNodeFeeds()
return
}
// add the node to the connection map
feedInfo := &FeedInfo{
uprFeed: singleFeed,
connected: true,
host: serverConn.host,
quit: make(chan bool),
}
feed.nodeFeeds[serverConn.host] = feedInfo
go feed.forwardUprEvents(feedInfo, feed.killSwitch, serverConn.host)
feed.wg.Add(1)
nodeCount++
}
if nodeCount == 0 {
return fmt.Errorf("No connection to bucket")
}
return nil
}
func (b *Bucket) ObserveAndPersistPoll(vb uint16, vbuuid uint64, seqNo uint64) (err error, failover bool) {
b.RLock()
ds := b.ds
b.RUnlock()
if ds == nil {
return
}
nj := 0 // total number of jobs
resultChan := make(chan *ObservePersistJob, 10)
errChan := make(chan *OPErrResponse, 10)
nodes := b.GetNodeList(vb)
if int(ds.Observe) > len(nodes) || int(ds.Persist) > len(nodes) {
return fmt.Errorf("Not enough healthy nodes in the cluster"), false
}
logging.Infof("Node list %v", nodes)
if ds.Observe >= ObserveReplicateOne {
// create a job for each host
for i := ObserveReplicateOne; i < ds.Observe+1; i++ {
opJob := ObservePersistPool.Get()
opJob.vb = vb
opJob.vbuuid = vbuuid
opJob.jobType = OBSERVE
opJob.hostname = nodes[i]
opJob.resultChan = resultChan
opJob.errorChan = errChan
OPJobChan <- opJob
nj++
}
}
if ds.Persist >= PersistMaster {
for i := PersistMaster; i < ds.Persist+1; i++ {
opJob := ObservePersistPool.Get()
opJob.vb = vb
opJob.vbuuid = vbuuid
opJob.jobType = PERSIST
opJob.hostname = nodes[i]
opJob.resultChan = resultChan
opJob.errorChan = errChan
OPJobChan <- opJob
nj++
}
}
ok := true
for ok {
select {
case res := <-resultChan:
jobDone := false
if res.failover == 0 {
// no failover
if res.jobType == PERSIST {
if res.lastPersistedSeqNo >= seqNo {
jobDone = true
}
} else {
if res.currentSeqNo >= seqNo {
jobDone = true
}
}
if jobDone == true {
nj--
ObservePersistPool.Put(res)
} else {
// requeue this job
OPJobChan <- res
}
} else {
// Not currently handling failover scenarios TODO
nj--
ObservePersistPool.Put(res)
failover = true
}
if nj == 0 {
// done with all the jobs
ok = false
close(resultChan)
close(errChan)
}
case Err := <-errChan:
logging.Errorf("Error in Observe/Persist %v", Err.err)
err = fmt.Errorf("Error in Observe/Persist job %v", Err.err)
nj--
ObservePersistPool.Put(Err.job)
if nj == 0 {
close(resultChan)
close(errChan)
ok = false
}
}
}
return
}
func (b *Bucket) doBulkGet(vb uint16, keys []string,
ch chan<- map[string]*gomemcached.MCResponse, ech chan<- error) {
if SlowServerCallWarningThreshold > 0 {
defer slowLog(time.Now(), "call to doBulkGet(%d, %d keys)", vb, len(keys))
}
rv := _STRING_MCRESPONSE_POOL.Get()
attempts := 0
done := false
for attempts < MaxBulkRetries && !done {
if len(b.VBServerMap().VBucketMap) < int(vb) {
//fatal
logging.Errorf("go-couchbase: vbmap smaller than requested vbucket number. vb %d vbmap len %d", vb, len(b.VBServerMap().VBucketMap))
err := fmt.Errorf("vbmap smaller than requested vbucket")
ech <- err
return
}
masterID := b.VBServerMap().VBucketMap[vb][0]
attempts++
if masterID < 0 {
// fatal
logging.Errorf("No master node available for vb %d", vb)
err := fmt.Errorf("No master node available for vb %d", vb)
ech <- err
return
}
// This stack frame exists to ensure we can clean up
// connection at a reasonable time.
err := func() error {
pool := b.getConnPool(masterID)
conn, err := pool.Get()
if err != nil {
if isAuthError(err) {
logging.Errorf(" Fatal Auth Error %v", err)
ech <- err
return err
} else if isConnError(err) {
// for a connection error, refresh right away
b.Refresh()
}
logging.Infof("Pool Get returned %v", err)
// retry
return nil
}
err = conn.GetBulk(vb, keys, rv)
pool.Return(conn)
switch err.(type) {
case *gomemcached.MCResponse:
st := err.(*gomemcached.MCResponse).Status
if st == gomemcached.NOT_MY_VBUCKET {
b.Refresh()
// retry
err = nil
}
return err
case error:
if !isConnError(err) {
ech <- err
ch <- rv
return err
} else if strings.EqualFold(err.Error(), "Bounds") {
// We got an out of bound error, retry the operation
return nil
}
logging.Errorf("Connection Error: %s. Refreshing bucket", err.Error())
b.Refresh()
// retry
return nil
}
done = true
return nil
}()
if err != nil {
return
}
}
if attempts == MaxBulkRetries {
ech <- fmt.Errorf("bulkget exceeded MaxBulkRetries for vbucket %d", vb)
}
ch <- rv
}
func (b *Bucket) UpdateBucket() error {
var failures int
var returnErr error
for {
if failures == MAX_RETRY_COUNT {
logging.Errorf(" Maximum failures reached. Exiting loop...")
return fmt.Errorf("Max failures reached. Last Error %v", returnErr)
}
nodes := b.Nodes()
if len(nodes) < 1 {
return fmt.Errorf("No healthy nodes found")
}
startNode := rand.Intn(len(nodes))
node := nodes[(startNode)%len(nodes)]
streamUrl := fmt.Sprintf("http://%s/pools/default/bucketsStreaming/%s", node.Hostname, b.GetName())
logging.Infof(" Trying with %s", streamUrl)
req, err := http.NewRequest("GET", streamUrl, nil)
if err != nil {
return err
}
// Lock here to avoid having pool closed under us.
b.RLock()
err = maybeAddAuth(req, b.pool.client.ah)
b.RUnlock()
if err != nil {
return err
}
res, err := doHTTPRequestForUpdate(req)
if err != nil {
return err
}
if res.StatusCode != 200 {
bod, _ := ioutil.ReadAll(io.LimitReader(res.Body, 512))
logging.Errorf("Failed to connect to host, unexpected status code: %v. Body %s", res.StatusCode, bod)
res.Body.Close()
returnErr = fmt.Errorf("Failed to connect to host. Status %v Body %s", res.StatusCode, bod)
failures++
continue
}
dec := json.NewDecoder(res.Body)
tmpb := &Bucket{}
for {
err := dec.Decode(&tmpb)
if err != nil {
returnErr = err
res.Body.Close()
break
}
// if we got here, reset failure count
failures = 0
b.Lock()
// mark all the old connection pools for deletion
pools := b.getConnPools(true /* already locked */)
for _, pool := range pools {
if pool != nil {
pool.inUse = false
}
}
newcps := make([]*connectionPool, len(tmpb.VBSMJson.ServerList))
for i := range newcps {
// get the old connection pool and check if it is still valid
pool := b.getConnPoolByHost(tmpb.VBSMJson.ServerList[i], true /* bucket already locked */)
if pool != nil && pool.inUse == false {
// if the hostname and index is unchanged then reuse this pool
newcps[i] = pool
pool.inUse = true
continue
}
// else create a new pool
if b.ah != nil {
newcps[i] = newConnectionPool(
tmpb.VBSMJson.ServerList[i],
b.ah, PoolSize, PoolOverflow)
} else {
newcps[i] = newConnectionPool(
tmpb.VBSMJson.ServerList[i],
b.authHandler(true /* bucket already locked */), PoolSize, PoolOverflow)
}
}
b.replaceConnPools2(newcps, true /* bucket already locked */)
tmpb.ah = b.ah
b.vBucketServerMap = unsafe.Pointer(&tmpb.VBSMJson)
b.nodeList = unsafe.Pointer(&tmpb.NodesJSON)
b.Unlock()
logging.Infof("Got new configuration for bucket %s", b.GetName())
}
// we are here because of an error
failures++
continue
}
return nil
}
