[milo] Refactor all html knowledge out of backends.

milo/buildsource/rawpresentation/html.go

Index: milo/buildsource/rawpresentation/html.go
diff --git a/milo/buildsource/rawpresentation/html.go b/milo/buildsource/rawpresentation/html.go
index 9a2c88a6f7e90d0aaaafef51835e3d866864ec61..3dc292702dac4b5908d3d73deaf0d3e664c89d7d 100644
--- a/milo/buildsource/rawpresentation/html.go
+++ b/milo/buildsource/rawpresentation/html.go
@@ -16,79 +16,15 @@ package rawpresentation
 
 import (
 	"net/http"
-	"strings"
 
 	"github.com/luci/luci-go/common/errors"
-	log "github.com/luci/luci-go/common/logging"
 	"github.com/luci/luci-go/grpc/prpc"
 	"github.com/luci/luci-go/logdog/client/coordinator"
-	"github.com/luci/luci-go/logdog/common/types"
-	"github.com/luci/luci-go/luci_config/common/cfgtypes"
-	"github.com/luci/luci-go/milo/common"
 	"github.com/luci/luci-go/server/auth"
-	"github.com/luci/luci-go/server/router"
-	"github.com/luci/luci-go/server/templates"
 
 	"golang.org/x/net/context"
 )
 
-// AnnotationStreamHandler is a Handler that renders a LogDog Milo
-// annotation protobuf stream.
-//
-// The protobuf stream is fetched live from LogDog and cached locally, either
-// temporarily (if incomplete) or indefinitely (if complete).
-type AnnotationStreamHandler struct{}
-
-func BuildHandler(c *router.Context) {
-	(&AnnotationStreamHandler{}).Render(c)
-	return
-}
-
-// Render implements settings.ThemedHandler.
-func (s *AnnotationStreamHandler) Render(c *router.Context) {
-	as := AnnotationStream{
-		Project: cfgtypes.ProjectName(c.Params.ByName("project")),
-		Path:    types.StreamPath(strings.Trim(c.Params.ByName("path"), "/")),
-	}
-	if err := as.Normalize(); err != nil {
-		common.ErrorPage(c, http.StatusBadRequest, err.Error())
-		return
-	}
-
-	// Setup our LogDog client.
-	var err error
-	host := strings.TrimSpace(c.Params.ByName("logdog_host"))
-	if as.Client, err = NewClient(c.Context, host); err != nil {
-		log.WithError(err).Errorf(c.Context, "Failed to generate LogDog client.")
-		common.ErrorPage(c, http.StatusInternalServerError, "Failed to generate LogDog client")
-		return
-	}
-
-	// Load the Milo annotation protobuf from the annotation stream.
-	if _, err := as.Fetch(c.Context); err != nil {
-		switch errors.Unwrap(err) {
-		case coordinator.ErrNoSuchStream:
-			common.ErrorPage(c, http.StatusNotFound, "Stream does not exist")
-
-		case coordinator.ErrNoAccess:
-			common.ErrorPage(c, http.StatusForbidden, "No access to LogDog stream")
-
-		case errNotMilo, errNotDatagram:
-			// The user requested a LogDog url that isn't a Milo annotation.
-			common.ErrorPage(c, http.StatusBadRequest, err.Error())
-
-		default:
-			log.WithError(err).Errorf(c.Context, "Failed to load LogDog stream.")
-			common.ErrorPage(c, http.StatusInternalServerError, "Failed to load LogDog stream")
-		}
-		return
-	}
-
-	templates.MustRender(c.Context, c.Writer, "pages/build.html", templates.Args{
-		"Build": as.toMiloBuild(c.Context),
-	})
-}
-
 func resolveHost(host string) (string, error) {
 	// Resolveour our Host, and validate it against a host whitelist.
 	switch host {