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state.go
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state.go
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// Copyright 2014 The fleet Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"errors"
"net/http"
"path"
"github.com/coreos/fleet/client"
"github.com/coreos/fleet/log"
"github.com/coreos/fleet/schema"
)
func wireUpStateResource(mux *http.ServeMux, prefix string, tokenLimit int, cAPI client.API) {
base := path.Join(prefix, "state")
sr := stateResource{cAPI, base, uint16(tokenLimit)}
mux.Handle(base, &sr)
mux.Handle(base+"/", &sr)
}
type stateResource struct {
cAPI client.API
basePath string
tokenLimit uint16
}
func (sr *stateResource) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if isCollectionPath(sr.basePath, req.URL.Path) {
switch req.Method {
case "GET":
sr.list(rw, req)
default:
sendError(rw, http.StatusMethodNotAllowed, errors.New("only GET supported against this resource"))
}
} else if item, ok := isItemPath(sr.basePath, req.URL.Path); ok {
switch req.Method {
case "GET":
sr.get(rw, req, item)
default:
sendError(rw, http.StatusMethodNotAllowed, errors.New("only GET supported against this resource"))
}
} else {
sendError(rw, http.StatusNotFound, nil)
}
}
func (sr *stateResource) list(rw http.ResponseWriter, req *http.Request) {
token, err := findNextPageToken(req.URL, sr.tokenLimit)
if err != nil {
sendError(rw, http.StatusBadRequest, err)
return
}
if token == nil {
def := DefaultPageToken(sr.tokenLimit)
token = &def
}
var machineID, unitName string
for _, val := range req.URL.Query()["machineID"] {
machineID = val
break
}
for _, val := range req.URL.Query()["unitName"] {
unitName = val
break
}
page, err := getUnitStatePage(sr.cAPI, machineID, unitName, *token)
if err != nil {
log.Errorf("Failed fetching page of UnitStates: %v", err)
sendError(rw, http.StatusInternalServerError, nil)
return
}
sendResponse(rw, http.StatusOK, &page)
}
func (sr *stateResource) get(rw http.ResponseWriter, req *http.Request, item string) {
us, err := sr.cAPI.UnitState(item)
if err != nil {
log.Errorf("Failed fetching UnitState(%s) from Registry: %v", item, err)
sendError(rw, http.StatusInternalServerError, nil)
return
}
if us == nil {
sendError(rw, http.StatusNotFound, errors.New("unit state does not exist"))
return
}
sendResponse(rw, http.StatusOK, *us)
}
func getUnitStatePage(cAPI client.API, machineID, unitName string, tok PageToken) (*schema.UnitStatePage, error) {
states, err := cAPI.UnitStates()
if err != nil {
return nil, err
}
var filtered []*schema.UnitState
for _, us := range states {
if machineID != "" && machineID != us.MachineID {
continue
}
if unitName != "" && unitName != us.Name {
continue
}
filtered = append(filtered, us)
}
items, next := extractUnitStatePageData(filtered, tok)
page := schema.UnitStatePage{
States: items,
}
if next != nil {
page.NextPageToken = next.Encode()
}
return &page, nil
}
func extractUnitStatePageData(all []*schema.UnitState, tok PageToken) (items []*schema.UnitState, next *PageToken) {
total := len(all)
startIndex := int((tok.Page - 1) * tok.Limit)
stopIndex := int(tok.Page * tok.Limit)
if startIndex < total {
if stopIndex > total {
stopIndex = total
} else {
n := tok.Next()
next = &n
}
items = all[startIndex:stopIndex]
}
return
}