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processor.go
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processor.go
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package processor
import (
"context"
"errors"
"net/http"
"strconv"
"time"
"github.com/aldor007/mort/pkg/cache"
"github.com/aldor007/mort/pkg/config"
"github.com/aldor007/mort/pkg/engine"
"github.com/aldor007/mort/pkg/lock"
"github.com/aldor007/mort/pkg/middleware"
"github.com/aldor007/mort/pkg/monitoring"
"github.com/aldor007/mort/pkg/object"
_ "github.com/aldor007/mort/pkg/object/cloudinary"
_ "github.com/aldor007/mort/pkg/object/tengo"
"github.com/aldor007/mort/pkg/processor/plugins"
"github.com/aldor007/mort/pkg/response"
"github.com/aldor007/mort/pkg/storage"
"github.com/aldor007/mort/pkg/throttler"
"github.com/aldor007/mort/pkg/transforms"
"go.uber.org/zap"
)
const s3LocationStr = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><LocationConstraint xmlns=\"http://s3.amazonaws.com/doc/2006-03-01/\">EU</LocationConstraint>"
var (
errTimeout = errors.New("timeout") // error when timeout
errContextCancel = errors.New("context timeout") // error when context timeout
errThrottled = errors.New("throttled") // error when request throttled
)
// NewRequestProcessor create instance of request processor
// It main component of mort it handle all of requests
func NewRequestProcessor(serverConfig config.Server, l lock.Lock, throttler throttler.Throttler) RequestProcessor {
rp := RequestProcessor{}
rp.collapse = l
rp.throttler = throttler
rp.processTimeout = time.Duration(serverConfig.RequestTimeout) * time.Second
rp.lockTimeout = time.Duration(serverConfig.LockTimeout) * time.Second
rp.serverConfig = serverConfig
rp.plugins = plugins.NewPluginsManager(serverConfig.Plugins)
rp.responseCache = cache.Create(serverConfig.Cache)
return rp
}
// RequestProcessor handle incoming requests
type RequestProcessor struct {
collapse lock.Lock // interface used for request collapsing
throttler throttler.Throttler // interface used for rate limiting creating of new images
processTimeout time.Duration // request processing timeout
lockTimeout time.Duration // lock timeout for collapsed request it equal processTimeout - 1 s
plugins plugins.PluginsManager // plugins run plugins before some phases of requests processing
serverConfig config.Server
responseCache cache.ResponseCache
}
type requestMessage struct {
responseChan chan *response.Response
obj *object.FileObject
request *http.Request
}
// Process handle incoming request and create response
func (r *RequestProcessor) Process(req *http.Request, obj *object.FileObject) *response.Response {
pCtx := req.Context()
var ctx context.Context
var timeout context.CancelFunc
// if object has transfroms we can assume that it is image generated by mort
// otherwise it can be big zip file
if obj.HasTransform() {
ctx, timeout = context.WithTimeout(pCtx, r.processTimeout)
defer timeout()
} else {
ctx = pCtx
}
obj.FillWithRequest(req, ctx)
r.plugins.PreProcess(obj, req)
msg := requestMessage{}
msg.request = req
msg.obj = obj
msg.responseChan = make(chan *response.Response)
go r.processChan(ctx, msg)
select {
case <-ctx.Done():
monitoring.Log().Warn("Process timeout", obj.LogData(zap.String("error", "Context.timeout"))...)
return r.replyWithError(obj, 499, errContextCancel)
case res := <-msg.responseChan:
r.plugins.PostProcess(obj, req, res)
return res
}
}
func (r *RequestProcessor) processChan(ctx context.Context, msg requestMessage) {
res := r.process(msg.request, msg.obj)
select {
case <-ctx.Done():
res.Close()
return
case msg.responseChan <- res:
return
}
}
func (r *RequestProcessor) replyWithError(obj *object.FileObject, sc int, err error) *response.Response {
if !obj.HasTransform() || obj.Debug || r.serverConfig.PlaceholderStr == "" {
return response.NewError(sc, err)
}
errorObject, errCreate := object.NewFileErrorObject(r.serverConfig.PlaceholderStr, obj)
if errCreate != nil {
return response.NewError(sc, err)
}
if cacheRes, errCache := r.responseCache.Get(errorObject); errCache == nil {
cacheRes.StatusCode = sc
return cacheRes
}
go func() {
_, locked := r.collapse.Lock(obj.Ctx, errorObject.Key)
if locked {
defer r.collapse.Release(obj.Ctx, errorObject.Key)
monitoring.Log().Info("Lock acquired for error response", obj.LogData()...)
parent := response.NewBuf(200, r.serverConfig.Placeholder.Buf)
transformsTab := []transforms.Transforms{obj.Transforms}
eng := engine.NewImageEngine(parent)
res, err := eng.Process(obj, transformsTab)
if err == nil {
res.StatusCode = sc
r.responseCache.Set(errorObject, updateHeaders(errorObject, res))
}
}
}()
res := response.NewBuf(sc, r.serverConfig.Placeholder.Buf)
res.SetContentType(r.serverConfig.Placeholder.ContentType)
return res
}
func (r *RequestProcessor) process(req *http.Request, obj *object.FileObject) *response.Response {
get := func() *response.Response {
if obj.Key == "" {
return handleS3Get(req, obj)
}
// todo Cache layer should be protected by memory lock.
res, err := r.responseCache.Get(obj)
if err == nil {
return res
}
if obj.HasTransform() {
res = updateHeaders(obj, r.collapseGET(req, obj))
} else {
res = updateHeaders(obj, r.handleGET(req, obj))
}
if !res.IsFromCache() && res.IsCacheable() && res.ContentLength != -1 && res.ContentLength < r.serverConfig.Cache.MaxCacheItemSize {
resCpy, err := res.Copy()
objCpy := obj.Copy()
if err == nil {
go func() {
resCpy.Body()
err = r.responseCache.Set(objCpy, resCpy)
if err != nil {
monitoring.Log().Error("response cache error set", obj.LogData(zap.Error(err))...)
}
}()
}
}
return res
}
switch req.Method {
case "HEAD":
if obj.Key == "" {
return handleS3Get(req, obj)
}
if obj.HasTransform() {
return get()
}
return updateHeaders(obj, storage.Head(obj))
case "GET":
return get()
case "PUT":
go r.responseCache.Delete(obj)
return handlePUT(req, obj)
case "DELETE":
go r.responseCache.Delete(obj)
return storage.Delete(obj)
default:
return response.NewError(405, errors.New("method not allowed"))
}
}
func handlePUT(req *http.Request, obj *object.FileObject) *response.Response {
defer req.Body.Close()
return storage.Set(obj, req.Header, req.ContentLength, req.Body)
}
func (r *RequestProcessor) collapseGET(req *http.Request, obj *object.FileObject) *response.Response {
ctx := obj.Ctx
lockResult, locked := r.collapse.Lock(ctx, obj.Key)
if locked {
monitoring.Log().Info("Lock acquired", obj.LogData()...)
res := r.handleGET(req, obj)
r.collapse.NotifyAndRelease(ctx, obj.Key, res)
return res
}
if lockResult.Error != nil {
monitoring.Log().Warn("Error acquiring lock", obj.LogData()...)
return r.replyWithError(obj, 500, lockResult.Error)
}
monitoring.Report().Inc("collapsed_count")
monitoring.Log().Info("Lock not acquired", obj.LogData()...)
timer := time.NewTimer(r.lockTimeout)
for {
select {
case <-ctx.Done():
lockResult.Cancel <- true
return r.replyWithError(obj, 504, errContextCancel)
case res, ok := <-lockResult.ResponseChan:
if !ok || res == nil {
if cacheRes, err := r.responseCache.Get(obj); err == nil {
return cacheRes
}
return r.handleGET(req, obj)
}
return res
case <-timer.C:
lockResult.Cancel <- true
if cacheRes, err := r.responseCache.Get(obj); err == nil {
return cacheRes
}
return r.replyWithError(obj, 504, errTimeout)
}
}
}
// Handle single GET
// nolint: gocyclo
func (r *RequestProcessor) handleGET(req *http.Request, obj *object.FileObject) *response.Response {
ctx := obj.Ctx
currObj := obj
var parentObj *object.FileObject
var transformsTab []transforms.Transforms
var res *response.Response
var parentRes *response.Response
// search for root parent
for currObj.HasParent() {
if currObj.HasTransform() {
transformsTab = append(transformsTab, currObj.Transforms)
}
currObj = currObj.Parent
if !currObj.HasParent() {
parentObj = currObj
}
}
resChan := make(chan *response.Response, 1)
parentChan := make(chan *response.Response, 1)
go func(o *object.FileObject) {
var resp *response.Response
if r.serverConfig.MaxFileSize != 0 && len(transformsTab) == 0 {
resp = storage.Head(o)
if resp.ContentLength > r.serverConfig.MaxFileSize {
resp.Close()
resp = storage.CreatePreSign(obj)
} else {
resp = storage.Get(o)
}
} else {
resp = storage.Get(o)
}
// Ensure before passing the response that the context is not canceled.
// In such case Close the response.
// Passing the data to respChan and checking ctx.Done cannot be
// done in a single select since golang randomly choice which channel
// to handle. So when ctx.Done is closed there is 50% of chance that
// it will choice to send resp to resChan.
select {
case <-ctx.Done():
resp.Close()
return
default:
}
select {
case resChan <- resp:
return
default:
}
}(obj)
// get parent from storage
if parentObj != nil && obj.CheckParent {
go func(p *object.FileObject) {
select {
case <-ctx.Done():
return
case parentChan <- storage.Head(p):
return
}
}(parentObj)
}
for {
select {
case <-ctx.Done():
return r.replyWithError(obj, 499, errContextCancel)
case res = <-resChan:
if obj.CheckParent && parentObj != nil && (parentRes == nil || parentRes.StatusCode == 0) {
go func() {
resChan <- res
}()
} else {
if res.StatusCode == 404 {
res = r.handleNotFound(obj, parentObj, transformsTab, parentRes, res)
select {
case <-ctx.Done():
res.Close()
return res
default:
return res
}
}
monitoring.Report().Inc("request_type;type:download")
if res.StatusCode > 199 && res.StatusCode < 299 {
if obj.CheckParent && parentObj != nil && parentRes.StatusCode == 200 {
return res
}
return res
}
return res
}
case parentRes = <-parentChan:
if parentRes.StatusCode == 404 {
return parentRes
}
}
}
}
func (r *RequestProcessor) handleNotFound(obj, parentObj *object.FileObject, transformsTab []transforms.Transforms, parentRes, res *response.Response) *response.Response {
// We can close res as we will not use it
res.Close()
if parentObj == nil {
return res
}
if !obj.CheckParent {
parentRes = storage.Head(parentObj)
}
if parentRes.HasError() {
return r.replyWithError(obj, parentRes.StatusCode, parentRes.Error())
} else if parentRes.StatusCode == 404 {
monitoring.Log().Warn("Missing parent for object", obj.LogData()...)
return parentRes
}
parentRes.Close()
if parentRes.StatusCode != 200 || !parentRes.IsImage() {
return res
}
if cacheRes, errCache := r.responseCache.Get(parentObj); errCache == nil {
parentRes = cacheRes
} else {
parentRes = storage.Get(parentObj)
}
if obj.HasTransform() {
if !parentRes.IsFromCache() {
copyParentRes, err := parentRes.Copy()
if err != nil {
monitoring.Log().Warn("unable to copy qobject", parentObj.LogData(zap.Error(err))...)
} else {
updateHeaders(parentObj, copyParentRes)
go func() {
copyParentRes.Body()
defer copyParentRes.Close()
err := r.responseCache.Set(parentObj, copyParentRes)
if err != nil {
monitoring.Log().Warn("unable to set parent in cache", parentObj.LogData(zap.Error(err))...)
}
}()
}
}
// processImage returns new response so both parentRes must be closed
defer parentRes.Close()
return r.processImage(obj, parentRes, transformsTab)
}
return parentRes
}
func handleS3Get(req *http.Request, obj *object.FileObject) *response.Response {
query := req.URL.Query()
if _, ok := query["location"]; ok {
return response.NewString(200, s3LocationStr)
}
maxKeys := 1000
delimeter := ""
prefix := ""
marker := ""
if maxKeysQuery, ok := query["max-keys"]; ok {
maxKeys, _ = strconv.Atoi(maxKeysQuery[0])
}
if delimeterQuery, ok := query["delimeter"]; ok {
delimeter = delimeterQuery[0]
}
if prefixQuery, ok := query["prefix"]; ok {
prefix = prefixQuery[0]
}
if markerQuery, ok := query["marker"]; ok {
marker = markerQuery[0]
}
return storage.List(obj, maxKeys, delimeter, prefix, marker)
}
func (r *RequestProcessor) processImage(obj *object.FileObject, parent *response.Response, transformsTab []transforms.Transforms) *response.Response {
monitoring.Report().Inc("request_type;type:transform")
ctx := obj.Ctx
taked := r.throttler.Take(ctx)
if !taked {
monitoring.Log().Warn("Processor/processImage", obj.LogData(zap.String("error", "throttled"))...)
monitoring.Report().Inc("throttled_count")
return r.replyWithError(obj, 503, errThrottled)
}
defer r.throttler.Release()
transformsLen := len(transformsTab)
mergedTrans := transforms.Merge(transformsTab)
mergedLen := len(mergedTrans)
monitoring.Log().Info("Performing transforms", obj.LogData(zap.Int("transformsLen", transformsLen), zap.Int("mergedLen", mergedLen))...)
eng := engine.NewImageEngine(parent)
res, err := eng.Process(obj, mergedTrans)
if err != nil {
errRes := response.NewError(400, err)
errRes.SetTransforms(mergedTrans)
return errRes
}
res.SetTransforms(mergedTrans)
if err := storeProcessedImage(res, obj); err != nil {
monitoring.Log().Warn("Processor/processImage", obj.LogData(zap.Error(err))...)
}
return res
}
func storeProcessedImage(res *response.Response, obj *object.FileObject) error {
resCpy, err := res.Copy()
if err != nil {
return err
}
go func(objS object.FileObject, resS *response.Response) {
storage.Set(&objS, resS.Headers, resS.ContentLength, resS.Stream())
resS.Close()
}(*obj, resCpy)
return nil
}
func updateHeaders(obj *object.FileObject, res *response.Response) *response.Response {
ctx := obj.Ctx
mortConfig := config.GetInstance()
headers := mortConfig.Headers
bucket, ok := mortConfig.Buckets[obj.Bucket]
if ok {
for h, v := range bucket.Headers {
if res.Headers.Get(h) == "" {
res.Set(h, v)
}
}
}
for _, headerPred := range headers {
for _, status := range headerPred.StatusCodes {
if status == res.StatusCode {
for h, v := range headerPred.Values {
if headerPred.Override {
res.Set(h, v)
} else if res.Headers.Get(h) == "" {
res.Set(h, v)
}
}
return res
}
}
}
if ctx.Value(middleware.S3AuthCtxKey) != nil {
res.Set("Cache-Control", "no-cache")
}
return res
}