func (u *Upstream) ping() (up bool, ok bool) {
if u.PingPath != "" {
// the url must be syntactically valid for this to work but the host will be ignored because we
// are overriding the connection always
request, err := http.NewRequest("GET", "http://localhost"+u.PingPath, nil)
request.Header.Set("Connection", "Keep-Alive") // not sure if this should be here for a ping
if err != nil {
falcore.Error("Bad Ping request: %v", err)
return false, true
}
res, err := u.Transport.transport.RoundTrip(request)
if err != nil {
falcore.Error("[%s] Failed Ping to %v:%v: %v", u.Name, u.Transport.host, u.Transport.port, err)
return false, true
} else {
res.Body.Close()
}
if res.StatusCode == 200 {
return true, true
}
falcore.Error("[%s] Failed Ping to %v:%v: %v", u.Name, u.Transport.host, u.Transport.port, res.Status)
// bad status
return false, true
}
return false, false
}
func (f *FileFilter) FilterRequest(req *falcore.Request) (res *http.Response) {
// Clean asset path
asset_path := filepath.Clean(filepath.FromSlash(req.HttpRequest.URL.Path))
// Resolve PathPrefix
if strings.HasPrefix(asset_path, f.PathPrefix) {
asset_path = asset_path[len(f.PathPrefix):]
} else {
// The requested path doesn't fall into the scope of paths that are supposed to be handled by this filter
return
}
// Resolve FSBase
if f.BasePath != "" {
asset_path = filepath.Join(f.BasePath, asset_path)
} else {
falcore.Error("file_filter requires a BasePath")
return falcore.StringResponse(req.HttpRequest, 500, nil, "Server Error\n")
}
// Open File
if file, err := os.Open(asset_path); err == nil {
// If it's a directory, try opening the directory index
if stat, err := file.Stat(); f.DirectoryIndex != "" && err == nil && stat.Mode()&os.ModeDir > 0 {
file.Close()
asset_path = filepath.Join(asset_path, f.DirectoryIndex)
if file, err = os.Open(asset_path); err != nil {
return
}
}
// Make sure it's an actual file
if stat, err := file.Stat(); err == nil && stat.Mode()&os.ModeType == 0 {
res = &http.Response{
Request: req.HttpRequest,
StatusCode: 200,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Body: file,
Header: make(http.Header),
ContentLength: stat.Size(),
}
if ct := mime.TypeByExtension(filepath.Ext(asset_path)); ct != "" {
res.Header.Set("Content-Type", ct)
}
} else {
file.Close()
}
} else {
falcore.Finest("Can't open %v: %v", asset_path, err)
}
return
}
// fixme: probably should use net.SplitHostPort
func SplitHostPort(hostPort string, defaultPort int) (string, int) {
parts := strings.Split(hostPort, ":")
upstreamHost := parts[0]
upstreamPort := defaultPort
if len(parts) > 1 {
var err error
upstreamPort, err = strconv.Atoi(parts[1])
if err != nil {
upstreamPort = defaultPort
falcore.Error("UpstreamPool Error converting port to int for", upstreamHost, ":", err)
}
}
return upstreamHost, upstreamPort
}
func (f *FileFilter) FilterRequest(req *falcore.Request) (res *http.Response) {
// Clean asset path
asset_path := filepath.Clean(filepath.FromSlash(req.HttpRequest.URL.Path))
// Resolve PathPrefix
if strings.HasPrefix(asset_path, f.PathPrefix) {
asset_path = asset_path[len(f.PathPrefix):]
} else {
falcore.Debug("%v doesn't match prefix %v", asset_path, f.PathPrefix)
res = falcore.StringResponse(req.HttpRequest, 404, nil, "Not found.")
return
}
// Resolve FSBase
if f.BasePath != "" {
asset_path = filepath.Join(f.BasePath, asset_path)
} else {
falcore.Error("file_filter requires a BasePath")
return falcore.StringResponse(req.HttpRequest, 500, nil, "Server Error\n")
}
// Open File
if file, err := os.Open(asset_path); err == nil {
// Make sure it's an actual file
if stat, err := file.Stat(); err == nil && stat.Mode()&os.ModeType == 0 {
res = &http.Response{
Request: req.HttpRequest,
StatusCode: 200,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Body: file,
Header: make(http.Header),
ContentLength: stat.Size(),
}
if ct := mime.TypeByExtension(filepath.Ext(asset_path)); ct != "" {
res.Header.Set("Content-Type", ct)
}
} else {
file.Close()
}
} else {
falcore.Finest("Can't open %v: %v", asset_path, err)
}
return
}
func (t *UpstreamTransport) dial(n, a string) (c net.Conn, err error) {
var addr *net.TCPAddr
addr, err = t.lookupIp()
falcore.Fine("Dialing connection to %v", addr)
var ctcp *net.TCPConn
ctcp, err = net.DialTCP("tcp4", nil, addr)
if err != nil {
falcore.Error("Dial Failed: %v", err)
return
}
// FIXME: Go1 has a race that causes problems with timeouts
// Recommend disabling until Go1.1
if t.timeout > 0 {
c = &timeoutConnWrapper{conn: ctcp, timeout: t.timeout}
} else {
c = ctcp
}
return
}
func (u *Upstream) FilterRequest(request *falcore.Request) (res *http.Response) {
var err error
req := request.HttpRequest
if u.Name != "" {
request.CurrentStage.Name = fmt.Sprintf("%s[%s]", request.CurrentStage.Name, u.Name)
}
// Throttle
// Wait for an opening, then increment in flight counter
u.throttleC.L.Lock()
u.throttleQueue += 1
for u.throttleMax > 0 && u.throttleInFlight >= u.throttleMax {
u.throttleC.Wait()
}
u.throttleQueue -= 1
u.throttleInFlight += 1
u.throttleC.L.Unlock()
// Decrement and signal when done
defer func() {
u.throttleC.L.Lock()
u.throttleInFlight -= 1
u.throttleC.Signal()
u.throttleC.L.Unlock()
}()
// Force the upstream to use http
if u.ForceHttp || req.URL.Scheme == "" {
req.URL.Scheme = "http"
req.URL.Host = req.Host
}
before := time.Now()
req.Header.Set("Connection", "Keep-Alive")
var upstrRes *http.Response
upstrRes, err = u.Transport.transport.RoundTrip(req)
diff := falcore.TimeDiff(before, time.Now())
if err == nil {
// Copy response over to new record. Remove connection noise. Add some sanity.
res = falcore.StringResponse(req, upstrRes.StatusCode, nil, "")
if upstrRes.ContentLength > 0 {
res.ContentLength = upstrRes.ContentLength
res.Body = upstrRes.Body
} else if res.ContentLength == -1 {
res.Body = upstrRes.Body
res.ContentLength = -1
res.TransferEncoding = []string{"chunked"}
} else {
// Any bytes?
var testBuf [1]byte
n, _ := io.ReadFull(upstrRes.Body, testBuf[:])
if n == 1 {
// Yes there are. Chunked it is.
res.TransferEncoding = []string{"chunked"}
res.ContentLength = -1
rc := &passThruReadCloser{
io.MultiReader(bytes.NewBuffer(testBuf[:]), upstrRes.Body),
upstrRes.Body,
}
res.Body = rc
} else {
// There was an error reading the body
upstrRes.Body.Close()
res.ContentLength = 0
res.Body = nil
}
}
// Copy over headers with a few exceptions
res.Header = make(http.Header)
for hn, hv := range upstrRes.Header {
switch hn {
case "Content-Length":
case "Connection":
case "Transfer-Encoding":
default:
res.Header[hn] = hv
}
}
} else {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
falcore.Error("%s [%s] Upstream Timeout error: %v", request.ID, u.Name, err)
res = falcore.StringResponse(req, 504, nil, "Gateway Timeout\n")
request.CurrentStage.Status = 2 // Fail
} else {
falcore.Error("%s [%s] Upstream error: %v", request.ID, u.Name, err)
res = falcore.StringResponse(req, 502, nil, "Bad Gateway\n")
request.CurrentStage.Status = 2 // Fail
}
}
falcore.Debug("%s %s [%s] [%s] %s s=%d Time=%.4f", request.ID, u.Name, req.Method, u.Transport.host, req.URL, res.StatusCode, diff)
return
}
func (c *CompressionFilter) FilterResponse(request *falcore.Request, res *http.Response) {
req := request.HttpRequest
if accept := req.Header.Get("Accept-Encoding"); accept != "" {
// Is content an acceptable type for encoding?
var compress = false
var content_type = res.Header.Get("Content-Type")
for _, t := range c.types {
if content_type == t {
compress = true
break
}
}
// Is the content already compressed
if res.Header.Get("Content-Encoding") != "" {
compress = false
}
if !compress {
request.CurrentStage.Status = 1 // Skip
return
}
// Figure out which encoding to use
options := strings.Split(accept, ",")
var mode string
for _, opt := range options {
if m := strings.TrimSpace(opt); m == "gzip" || m == "deflate" {
mode = m
break
}
}
var compressor io.WriteCloser
pReader, pWriter := io.Pipe()
switch mode {
case "gzip":
compressor = gzip.NewWriter(pWriter)
case "deflate":
comp, err := flate.NewWriter(pWriter, -1)
if err != nil {
falcore.Error("Compression Error: %v", err)
request.CurrentStage.Status = 1 // Skip
return
}
compressor = comp
default:
request.CurrentStage.Status = 1 // Skip
return
}
// Perform compression
var rdr = res.Body
go func() {
_, err := io.Copy(compressor, rdr)
compressor.Close()
pWriter.Close()
rdr.Close()
if err != nil {
falcore.Error("Error compressing body: %v", err)
}
}()
res.ContentLength = -1
res.Body = pReader
res.Header.Set("Content-Encoding", mode)
} else {
request.CurrentStage.Status = 1 // Skip
}
}
