func setReqVersion(req *http.Request) {
if req.Header == nil {
req.Header = make(map[string]string)
}
req.Header["Vault-Build"] = sys.Build
req.Header["Vault-Proto"] = Version
}
func setReqHop(req *http.Request, h int) {
if req.Header == nil {
req.Header = make(map[string]string)
}
req.Header["Vault-Hop"] = strconv.Itoa(h)
}
func setOrigin(req *http.Request, id sys.Id) {
if req.Header == nil {
req.Header = make(map[string]string)
}
req.Header["Vault-Origin"] = id.Eye()
}
func (v *Vault0) serve(req *http.Request, my bool) (*http.Response, os.Error) {
// We don't expect a body in requests (at this stage, there are no POSTs)
if req.Body != nil {
req.Body.Close()
req.Body = nil
}
// Parse the URL
tid, fpath, query, err := parseURL(req)
if err != nil {
return newRespBadRequest(), os.ErrorString("bad request")
}
// If request is at its final destination
if tid == v.id {
h, err := parseReqHop(req)
if err == nil {
v.w.AddHopsFwd(h) // Stat hop count at destination
}
resp, err := v.serveLocal(fpath, query)
if err == nil {
setRespHop(resp, 0)
}
return resp, err
}
// Stop if too many hops or hops not included
h, err := parseReqHop(req)
if err != nil || h > maxHops {
v.w.IncTooManyHops()
return newRespServiceUnavailable(), os.ErrorString("too many hops")
}
// Parse the HTTP header
sid, err := parseOrigin(req)
if err != nil {
sid = v.id
}
hid := v.c.QueryQuantize(sid, tid)
if hid == nil {
return newRespServiceUnavailable(), os.ErrorString("no route to destination")
}
d := v.isHealthy()
if d == nil {
return newRespServiceUnavailable(), os.ErrorString("service unavailable")
}
cc := d.Dial(*hid, "vault0")
if cc == nil {
return newRespServiceUnavailable(), os.ErrorString("service unavailable")
}
pcc := prof.NewConn(cc)
acc := http.NewAsyncClientConn(pcc)
// Pre-fetch
_, err = parseReqHop(req)
if err != nil {
setReqHop(req, 0)
}
setReqVersion(req)
// Fetch and post-fetch
resp, err := acc.Fetch(req)
if err != nil {
acc.Close()
pcc.Close()
return newRespServiceUnavailable(), os.ErrorString("service unavailable")
}
// Update hop
setRespVersion(resp)
h, err = parseRespHop(resp)
if err == nil {
setRespHop(resp, h+1)
} else {
setRespHop(resp, 0)
}
// Do we understand the response?
if !statusCodeSupported(resp.StatusCode) {
acc.Close()
pcc.Close()
return newRespUnsupported(), nil
}
// Set hooks for when body is fully read
if resp.Body == nil {
// Update traffic stats
if my {
v.w.IncFwdMyInTraffic(*hid, pcc.InTraffic())
v.w.IncFwdMyOutTraffic(*hid, pcc.OutTraffic())
} else {
v.w.IncFwdBehalfInTraffic(*hid, pcc.InTraffic())
v.w.IncFwdBehalfOutTraffic(*hid, pcc.OutTraffic())
}
v.w.RecFwdLatencyPerByte(*hid, float64(pcc.Duration())/float64(pcc.InTraffic()))
acc.Close()
pcc.Close()
} else {
resp.Body = http.NewRunOnClose(resp.Body, func() {
// Update traffic stats
if my {
v.w.IncFwdMyInTraffic(*hid, pcc.InTraffic())
v.w.IncFwdMyOutTraffic(*hid, pcc.OutTraffic())
} else {
v.w.IncFwdBehalfInTraffic(*hid, pcc.InTraffic())
v.w.IncFwdBehalfOutTraffic(*hid, pcc.OutTraffic())
}
v.w.RecFwdLatencyPerByte(*hid, float64(pcc.Duration())/float64(pcc.InTraffic()))
acc.Close()
pcc.Close()
})
}
return resp, nil
}