local-server/cmd/dkl-local-server/ws-host.go

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package main
import (
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"flag"
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"log"
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"net/http"
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"path"
restful "github.com/emicklei/go-restful"
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"novit.nc/direktil/local-server/pkg/mime"
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"novit.nc/direktil/pkg/localconfig"
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)
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var trustXFF = flag.Bool("trust-xff", true, "Trust the X-Forwarded-For header")
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type wsHost struct {
prefix string
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hostDoc string
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getHost func(req *restful.Request) string
}
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func (ws *wsHost) register(rws *restful.WebService, alterRB func(*restful.RouteBuilder)) {
b := func(what string) *restful.RouteBuilder {
return rws.GET(ws.prefix + "/" + what).To(ws.render)
}
for _, rb := range []*restful.RouteBuilder{
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rws.GET(ws.prefix).To(ws.get).
Doc("Get the " + ws.hostDoc + "'s details"),
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// raw configuration
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b("config").
Produces(mime.YAML).
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Doc("Get the " + ws.hostDoc + "'s configuration"),
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b("config.json").
Doc("Get the " + ws.hostDoc + "'s configuration (as JSON)"),
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// metal/local HDD install
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b("boot.img").
Produces(mime.DISK).
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Doc("Get the " + ws.hostDoc + "'s boot disk image"),
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b("boot.img.gz").
Produces(mime.DISK + "+gzip").
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Doc("Get the " + ws.hostDoc + "'s boot disk image (gzip compressed)"),
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b("boot.img.lz4").
Produces(mime.DISK + "+lz4").
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Doc("Get the " + ws.hostDoc + "'s boot disk image (lz4 compressed)"),
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// metal/local HDD upgrades
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b("boot.tar").
Produces(mime.TAR).
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Doc("Get the " + ws.hostDoc + "'s /boot archive (ie: for metal upgrades)"),
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// read-only ISO support
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b("boot.iso").
Produces(mime.ISO).
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Doc("Get the " + ws.hostDoc + "'s boot CD-ROM image"),
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// netboot support
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b("ipxe").
Produces(mime.IPXE).
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Doc("Get the " + ws.hostDoc + "'s IPXE code (for netboot)"),
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b("kernel").
Produces(mime.OCTET).
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Doc("Get the " + ws.hostDoc + "'s kernel (ie: for netboot)"),
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b("initrd").
Produces(mime.OCTET).
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Doc("Get the " + ws.hostDoc + "'s initial RAM disk (ie: for netboot)"),
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} {
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alterRB(rb)
rws.Route(rb)
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}
}
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func (ws *wsHost) host(req *restful.Request, resp *restful.Response) (host *localconfig.Host, cfg *localconfig.Config) {
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hostname := ws.getHost(req)
if hostname == "" {
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wsNotFound(req, resp)
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return
}
cfg, err := readConfig()
if err != nil {
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wsError(resp, err)
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return
}
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host = cfg.Host(hostname)
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if host == nil {
log.Print("no host named ", hostname)
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wsNotFound(req, resp)
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return
}
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return
}
func (ws *wsHost) get(req *restful.Request, resp *restful.Response) {
host, _ := ws.host(req, resp)
if host == nil {
return
}
resp.WriteEntity(host)
}
func (ws *wsHost) render(req *restful.Request, resp *restful.Response) {
host, cfg := ws.host(req, resp)
if host == nil {
return
}
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what := path.Base(req.Request.URL.Path)
renderHost(resp.ResponseWriter, req.Request, what, host, cfg)
}
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func renderHost(w http.ResponseWriter, r *http.Request, what string, host *localconfig.Host, cfg *localconfig.Config) {
ctx, err := newRenderContext(host, cfg)
if err != nil {
log.Printf("host %s: %s: failed to render: %v", what, host.Name, err)
http.Error(w, "", http.StatusServiceUnavailable)
return
}
switch what {
case "config":
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err = renderConfig(w, r, ctx, false)
case "config.json":
err = renderConfig(w, r, ctx, true)
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case "ipxe":
err = renderIPXE(w, ctx)
case "kernel":
err = renderKernel(w, r, ctx)
case "initrd":
err = renderCtx(w, r, ctx, what, buildInitrd)
case "boot.iso":
err = renderCtx(w, r, ctx, what, buildBootISO)
case "boot.tar":
err = renderCtx(w, r, ctx, what, buildBootTar)
case "boot.img":
err = renderCtx(w, r, ctx, what, buildBootImg)
case "boot.img.gz":
err = renderCtx(w, r, ctx, what, buildBootImgGZ)
case "boot.img.lz4":
err = renderCtx(w, r, ctx, what, buildBootImgLZ4)
default:
http.NotFound(w, r)
}
if err != nil {
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log.Printf("host %s: %s: failed to render: %v", what, host.Name, err)
http.Error(w, "", http.StatusServiceUnavailable)
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}
}