func (u *Upstream) FilterRequest(request *falcore.Request) (res *http.Response) {
var err os.Error
req := request.HttpRequest
// Force the upstream to use http
if u.ForceHttp || req.URL.Scheme == "" {
req.URL.Scheme = "http"
req.URL.Host = req.Host
}
before := time.Nanoseconds()
req.Header.Set("Connection", "Keep-Alive")
res, err = u.transport.RoundTrip(req)
diff := falcore.TimeDiff(before, time.Nanoseconds())
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
falcore.Error("%s Upstream Timeout error: %v", request.ID, err)
res = falcore.SimpleResponse(req, 504, nil, "Gateway Timeout\n")
request.CurrentStage.Status = 2 // Fail
} else {
falcore.Error("%s Upstream error: %v", request.ID, err)
res = falcore.SimpleResponse(req, 502, nil, "Bad Gateway\n")
request.CurrentStage.Status = 2 // Fail
}
}
falcore.Debug("%s [%s] [%s%s] s=%d Time=%.4f", request.ID, req.Method, u.host, req.RawURL, res.StatusCode, diff)
return
}
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.RoundTrip(request)
if err != nil {
falcore.Error("Failed Ping to %v:%v: %v", u.Host, u.Port, err)
return false, true
} else {
res.Body.Close()
}
if res.StatusCode == 200 {
return true, true
}
falcore.Error("Failed Ping to %v:%v: %v", u.Host, u.Port, res.Status)
// bad status
return false, true
}
return false, false
}
// The config consists of a map of the servers in the pool in the format host_or_ip:port
// where port is optional and defaults to 80. The map value is an int with the weight
// only 0 and 1 are supported weights (0 disables a server and 1 enables it)
func NewUpstreamPool(name string, config []UpstreamEntryConfig) *UpstreamPool {
up := new(UpstreamPool)
up.pool = make([]*UpstreamEntry, len(config))
up.Name = name
up.nextUpstream = make(chan *UpstreamEntry)
up.weightMutex = new(sync.RWMutex)
up.shutdown = make(chan int)
up.pinger = time.NewTicker(3e9) // 3s
// create the pool
for i, uec := range config {
parts := strings.Split(uec.HostPort, ":")
upstreamHost := parts[0]
upstreamPort := 80
if len(parts) > 1 {
var err os.Error
upstreamPort, err = strconv.Atoi(parts[1])
if err != nil {
upstreamPort = 80
falcore.Error("UpstreamPool Error converting port to int for", upstreamHost, ":", err)
}
}
ups := NewUpstream(upstreamHost, upstreamPort, uec.ForceHttp)
ups.PingPath = uec.PingPath
ue := new(UpstreamEntry)
ue.Upstream = ups
ue.Weight = uec.Weight
up.pool[i] = ue
}
go up.nextServer()
go up.pingUpstreams()
return up
}
func (f *Filter) 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.SimpleResponse(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.SimpleResponse(req.HttpRequest, 500, nil, "Server Error\n")
}
var fileSize int64
if stat, err := os.Stat(asset_path); err == nil {
fileSize = stat.Size
} else {
falcore.Debug("Can't stat %v: %v", asset_path, err)
return falcore.SimpleResponse(req.HttpRequest, 404, nil, "File not found\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.IsRegular() {
res = &http.Response{
Request: req.HttpRequest,
StatusCode: 200,
Proto: "HTTP/1.1",
Body: file,
Header: make(http.Header),
ContentLength: fileSize,
}
if ct := mime.TypeByExtension(filepath.Ext(asset_path)); ct != "" {
res.Header.Set("Content-Type", ct)
}
} else {
file.Close()
return falcore.SimpleResponse(req.HttpRequest, 404, nil, "File not found\n")
}
} else {
falcore.Debug("Can't open %v: %v", asset_path, err)
res = falcore.SimpleResponse(req.HttpRequest, 404, nil, "File not found\n")
}
return
}
func NewUpstream(host string, port int, forceHttp bool) *Upstream {
u := new(Upstream)
u.Host = host
u.Port = port
u.ForceHttp = forceHttp
ips, err := net.LookupIP(host)
var ip net.IP = nil
for i := range ips {
ip = ips[i].To4()
if ip != nil {
break
}
}
if err == nil && ip != nil {
u.tcpaddr = new(net.TCPAddr)
u.tcpaddr.Port = port
u.tcpaddr.IP = ip
} else {
falcore.Warn("Can't get IP addr for %v: %v", host, err)
}
u.Timeout = 60e9
u.host = fmt.Sprintf("%v:%v", u.Host, u.Port)
u.transport = new(http.Transport)
u.transport.Dial = func(n, addr string) (c net.Conn, err os.Error) {
falcore.Fine("Dialing connection to %v", u.tcpaddr)
var ctcp *net.TCPConn
ctcp, err = net.DialTCP("tcp4", nil, u.tcpaddr)
if ctcp != nil {
ctcp.SetTimeout(u.Timeout)
}
if err != nil {
falcore.Error("Dial Failed: %v", err)
}
return ctcp, err
}
u.transport.MaxIdleConnsPerHost = 15
return u
}