mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-24 21:34:36 -04:00
216 lines
4.9 KiB
Go
216 lines
4.9 KiB
Go
package couchbase
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import (
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"encoding/json"
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"fmt"
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"github.com/couchbase/goutils/logging"
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"io"
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"io/ioutil"
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"math/rand"
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"net"
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"net/http"
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"time"
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"unsafe"
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)
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// Bucket auto-updater gets the latest version of the bucket config from
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// the server. If the configuration has changed then updated the local
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// bucket information. If the bucket has been deleted then notify anyone
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// who is holding a reference to this bucket
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const MAX_RETRY_COUNT = 5
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const DISCONNECT_PERIOD = 120 * time.Second
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type NotifyFn func(bucket string, err error)
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// Use TCP keepalive to detect half close sockets
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var updaterTransport http.RoundTripper = &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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Dial: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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}).Dial,
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}
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var updaterHTTPClient = &http.Client{Transport: updaterTransport}
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func doHTTPRequestForUpdate(req *http.Request) (*http.Response, error) {
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var err error
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var res *http.Response
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for i := 0; i < HTTP_MAX_RETRY; i++ {
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res, err = updaterHTTPClient.Do(req)
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if err != nil && isHttpConnError(err) {
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continue
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}
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break
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}
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if err != nil {
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return nil, err
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}
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return res, err
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}
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func (b *Bucket) RunBucketUpdater(notify NotifyFn) {
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go func() {
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err := b.UpdateBucket()
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if err != nil {
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if notify != nil {
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notify(b.GetName(), err)
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}
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logging.Errorf(" Bucket Updater exited with err %v", err)
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}
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}()
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}
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func (b *Bucket) replaceConnPools2(with []*connectionPool, bucketLocked bool) {
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if !bucketLocked {
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b.Lock()
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defer b.Unlock()
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}
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old := b.connPools
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b.connPools = unsafe.Pointer(&with)
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if old != nil {
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for _, pool := range *(*[]*connectionPool)(old) {
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if pool != nil && pool.inUse == false {
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pool.Close()
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}
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}
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}
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return
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}
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func (b *Bucket) UpdateBucket() error {
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var failures int
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var returnErr error
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var poolServices PoolServices
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var err error
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tlsConfig := b.pool.client.tlsConfig
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if tlsConfig != nil {
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poolServices, err = b.pool.client.GetPoolServices("default")
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if err != nil {
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return err
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}
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}
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for {
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if failures == MAX_RETRY_COUNT {
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logging.Errorf(" Maximum failures reached. Exiting loop...")
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return fmt.Errorf("Max failures reached. Last Error %v", returnErr)
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}
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nodes := b.Nodes()
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if len(nodes) < 1 {
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return fmt.Errorf("No healthy nodes found")
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}
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startNode := rand.Intn(len(nodes))
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node := nodes[(startNode)%len(nodes)]
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streamUrl := fmt.Sprintf("http://%s/pools/default/bucketsStreaming/%s", node.Hostname, b.GetName())
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logging.Infof(" Trying with %s", streamUrl)
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req, err := http.NewRequest("GET", streamUrl, nil)
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if err != nil {
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return err
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}
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// Lock here to avoid having pool closed under us.
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b.RLock()
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err = maybeAddAuth(req, b.pool.client.ah)
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b.RUnlock()
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if err != nil {
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return err
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}
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res, err := doHTTPRequestForUpdate(req)
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if err != nil {
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return err
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}
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if res.StatusCode != 200 {
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bod, _ := ioutil.ReadAll(io.LimitReader(res.Body, 512))
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logging.Errorf("Failed to connect to host, unexpected status code: %v. Body %s", res.StatusCode, bod)
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res.Body.Close()
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returnErr = fmt.Errorf("Failed to connect to host. Status %v Body %s", res.StatusCode, bod)
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failures++
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continue
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}
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dec := json.NewDecoder(res.Body)
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tmpb := &Bucket{}
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for {
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err := dec.Decode(&tmpb)
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if err != nil {
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returnErr = err
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res.Body.Close()
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break
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}
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// if we got here, reset failure count
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failures = 0
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b.Lock()
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// mark all the old connection pools for deletion
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pools := b.getConnPools(true /* already locked */)
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for _, pool := range pools {
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if pool != nil {
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pool.inUse = false
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}
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}
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newcps := make([]*connectionPool, len(tmpb.VBSMJson.ServerList))
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for i := range newcps {
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// get the old connection pool and check if it is still valid
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pool := b.getConnPoolByHost(tmpb.VBSMJson.ServerList[i], true /* bucket already locked */)
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if pool != nil && pool.inUse == false {
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// if the hostname and index is unchanged then reuse this pool
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newcps[i] = pool
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pool.inUse = true
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continue
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}
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// else create a new pool
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hostport := tmpb.VBSMJson.ServerList[i]
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if tlsConfig != nil {
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hostport, err = MapKVtoSSL(hostport, &poolServices)
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if err != nil {
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b.Unlock()
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return err
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}
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}
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if b.ah != nil {
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newcps[i] = newConnectionPool(hostport,
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b.ah, false, PoolSize, PoolOverflow, b.pool.client.tlsConfig, b.Name)
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} else {
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newcps[i] = newConnectionPool(hostport,
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b.authHandler(true /* bucket already locked */),
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false, PoolSize, PoolOverflow, b.pool.client.tlsConfig, b.Name)
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}
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}
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b.replaceConnPools2(newcps, true /* bucket already locked */)
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tmpb.ah = b.ah
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b.vBucketServerMap = unsafe.Pointer(&tmpb.VBSMJson)
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b.nodeList = unsafe.Pointer(&tmpb.NodesJSON)
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b.Unlock()
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logging.Infof("Got new configuration for bucket %s", b.GetName())
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}
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// we are here because of an error
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failures++
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continue
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}
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return nil
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}
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