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pixiecore: factor the ipxe script generation out of the HTTP handler.

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This makes it easier to test the script generation in isolation,
as well as making the whole thing easier to follow.
This commit is contained in:
David Anderson 2016-08-10 21:54:16 -07:00
parent 6766b5ca59
commit 6a88cefc9b
1 changed files with 28 additions and 25 deletions
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53
pixiecore/http.go
View File

@ -16,6 +16,7 @@ package pixiecore
import (
"bytes"
"errors"
"fmt"
"io"
"net"
@ -68,17 +69,36 @@ func (s *Server) handleIpxe(w http.ResponseWriter, r *http.Request) {
s.httpError(w, r, http.StatusNotFound, "no bootspec found for %q", mach.MAC)
return
}
if spec.Kernel == "" {
// TODO: maybe don't send this error over the network?
s.logHTTP(r, "invalid bootspec for %q: missing kernel", mach.MAC)
script, err := ipxeScript(spec, r.Host)
if err != nil {
s.logHTTP(r, "failed to assemble ipxe script: %s", err)
http.Error(w, "couldn't get a bootspec", http.StatusInternalServerError)
return
}
// All is well, assemble the iPXE script.
w.Header().Set("Content-Type", "text/plain")
w.Write(script)
}
urlPrefix := fmt.Sprintf("http://%s/_/file?name=", r.Host)
func (s *Server) handleFile(w http.ResponseWriter, r *http.Request) {
name := r.URL.Query().Get("name")
f, err := s.Booter.ReadBootFile(ID(name))
if err != nil {
s.logHTTP(r, "error getting requested file %q: %s", name, err)
http.Error(w, "couldn't get file", http.StatusInternalServerError)
return
}
defer f.Close()
if _, err = io.Copy(w, f); err != nil {
s.logHTTP(r, "copy of file %q failed: %s", name, err)
}
}
func ipxeScript(spec *Spec, serverHost string) ([]byte, error) {
if spec.Kernel == "" {
return nil, errors.New("spec is missing Kernel")
}
urlPrefix := fmt.Sprintf("http://%s/_/file?name=", serverHost)
var b bytes.Buffer
b.WriteString("#!ipxe\n")
fmt.Fprintf(&b, "kernel --name kernel %s%s\n", urlPrefix, url.QueryEscape(string(spec.Kernel)))
@ -98,26 +118,9 @@ func (s *Server) handleIpxe(w http.ResponseWriter, r *http.Request) {
case ID:
fmt.Fprintf(&b, "%s=%s%s ", k, urlPrefix, url.QueryEscape(string(val)))
default:
s.logHTTP(r, "invalid bootspec for %q: unknown cmdline type for key %q", mach.MAC, k)
http.Error(w, "couldn't get a bootspec", http.StatusInternalServerError)
return
return nil, fmt.Errorf("unsupported cmdline type %T for key %q", v, k)
}
}
b.WriteByte('\n')
w.Header().Set("Content-Type", "text/plain")
b.WriteTo(w)
}
func (s *Server) handleFile(w http.ResponseWriter, r *http.Request) {
name := r.URL.Query().Get("name")
f, err := s.Booter.ReadBootFile(ID(name))
if err != nil {
s.logHTTP(r, "error getting requested file %q: %s", name, err)
http.Error(w, "couldn't get file", http.StatusInternalServerError)
return
}
defer f.Close()
if _, err = io.Copy(w, f); err != nil {
s.logHTTP(r, "copy of file %q failed: %s", name, err)
}
return b.Bytes(), nil
}