/
update.go
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/
update.go
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// Copyright (c) 2015 Rackspace
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package objectserver
import (
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"math/big"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"context"
"github.com/troubling/hummingbird/common"
"github.com/troubling/hummingbird/common/fs"
"github.com/troubling/hummingbird/common/pickle"
"github.com/troubling/hummingbird/common/srv"
"github.com/troubling/hummingbird/common/tracing"
"github.com/troubling/hummingbird/middleware"
"go.uber.org/zap"
)
/*This hash is used to represent a zero byte async file that is
created for an expiring object*/
const zeroByteHash = "d41d8cd98f00b204e9800998ecf8427e"
const deleteAtAccount = ".expiring_objects"
func splitHeader(header string) []string {
if header == "" {
return []string{}
}
return strings.Split(header, ",")
}
func (server *ObjectServer) hashPath(account, container, obj string) string {
h := md5.New()
io.WriteString(h, server.hashPathPrefix+"/"+account+"/"+container+"/"+obj+server.hashPathSuffix)
return hex.EncodeToString(h.Sum(nil))
}
func (server *ObjectServer) expirerContainer(deleteAt time.Time, account, container, obj string) string {
i := new(big.Int)
fmt.Sscanf(server.hashPath(account, container, obj), "%x", i)
shardInt := i.Mod(i, big.NewInt(100)).Int64()
timestamp := (deleteAt.Unix()/server.expiringDivisor)*server.expiringDivisor - shardInt
if timestamp < 0 {
timestamp = 0
} else if timestamp > 9999999999 {
timestamp = 9999999999
}
return fmt.Sprintf("%010d", timestamp)
}
func (server *ObjectServer) sendContainerUpdate(ctx context.Context, scheme, host, device, method, partition, account, container, obj string, headers http.Header) bool {
obj_url := fmt.Sprintf("%s://%s/%s/%s/%s/%s/%s", scheme, host, device, partition,
common.Urlencode(account), common.Urlencode(container), common.Urlencode(obj))
if req, err := http.NewRequest(method, obj_url, nil); err == nil {
req = req.WithContext(ctx)
req.Header = headers
if resp, err := server.updateClient.Do(req); err == nil {
resp.Body.Close()
if resp.StatusCode/100 == 2 {
return true
}
}
}
return false
}
func (server *ObjectServer) saveAsync(method, account, container, obj, localDevice string, headers http.Header, logger srv.LowLevelLogger) {
hash := server.hashPath(account, container, obj)
asyncFile := filepath.Join(server.driveRoot, localDevice, "async_pending", hash[29:32], hash+"-"+headers.Get("X-Timestamp"))
tempDir := TempDirPath(server.driveRoot, localDevice)
data := map[string]interface{}{
"op": method,
"account": account,
"container": container,
"obj": obj,
"headers": common.Headers2Map(headers),
}
var err error
if err = os.MkdirAll(filepath.Dir(asyncFile), 0755); err == nil {
var writer fs.AtomicFileWriter
writer, err = fs.NewAtomicFileWriter(tempDir, filepath.Dir(asyncFile))
if err == nil {
defer writer.Abandon()
writer.Write(pickle.PickleDumps(data))
writer.Save(asyncFile)
return
}
}
logger.Error("Error saving obj async", zap.String("objPath", fmt.Sprintf("%s/%s/%s", account, container, obj)), zap.Error(err))
}
func (server *ObjectServer) updateContainer(ctx context.Context, metadata map[string]string, request *http.Request, vars map[string]string, logger srv.LowLevelLogger) {
partition := request.Header.Get("X-Container-Partition")
hosts := splitHeader(request.Header.Get("X-Container-Host"))
devices := splitHeader(request.Header.Get("X-Container-Device"))
schemes := splitHeader(request.Header.Get("X-Container-Scheme"))
if partition == "" || len(hosts) == 0 || len(devices) == 0 {
return
}
for len(schemes) < len(hosts) {
schemes = append(schemes, "http")
}
requestHeaders := http.Header{
"X-Backend-Storage-Policy-Index": {common.GetDefault(request.Header, "X-Backend-Storage-Policy-Index", "0")},
"Referer": {common.GetDefault(request.Header, "Referer", "-")},
"User-Agent": {common.GetDefault(request.Header, "User-Agent", "-")},
"X-Trans-Id": {common.GetDefault(request.Header, "X-Trans-Id", "-")},
"X-Timestamp": request.Header["X-Timestamp"],
"X-Delete-At": request.Header["X-Delete-At"],
}
if request.Method != "DELETE" {
requestHeaders.Add("X-Content-Type", metadata["Content-Type"])
requestHeaders.Add("X-Size", metadata["Content-Length"])
requestHeaders.Add("X-Etag", metadata["ETag"])
}
failures := 0
for index := range hosts {
if !server.sendContainerUpdate(ctx, schemes[index], hosts[index], devices[index], request.Method, partition, vars["account"], vars["container"], vars["obj"], requestHeaders) {
logger.Error("ERROR container update failed (saving for async update later)",
zap.String("Host", hosts[index]),
zap.String("Device", devices[index]))
failures++
}
}
if failures > 0 {
server.saveAsync(request.Method, vars["account"], vars["container"], vars["obj"], vars["device"], requestHeaders, logger)
}
}
func (server *ObjectServer) containerUpdates(writer http.ResponseWriter, request *http.Request, metadata map[string]string, deleteAt string, vars map[string]string, logger srv.LowLevelLogger) {
defer middleware.Recover(writer, request, "PANIC WHILE UPDATING CONTAINER LISTINGS")
done := make(chan struct{}, 1)
go func() {
ctx := tracing.CopySpanFromContext(request.Context())
server.updateContainer(ctx, metadata, request, vars, logger)
done <- struct{}{}
}()
select {
case <-done:
case <-time.After(server.updateTimeout):
}
}