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server.go
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server.go
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/*
http://www.apache.org/licenses/LICENSE-2.0.txt
Copyright 2015 Intel Corporation
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 rest
import (
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/codegangsta/negroni"
"github.com/julienschmidt/httprouter"
"github.com/intelsdi-x/snap/core"
"github.com/intelsdi-x/snap/core/cdata"
"github.com/intelsdi-x/snap/core/serror"
"github.com/intelsdi-x/snap/mgmt/rest/rbody"
"github.com/intelsdi-x/snap/mgmt/tribe/agreement"
cschedule "github.com/intelsdi-x/snap/pkg/schedule"
"github.com/intelsdi-x/snap/scheduler/wmap"
)
const (
APIVersion = 1
)
var (
ErrBadCert = errors.New("Invalid certificate given")
restLogger = log.WithField("_module", "_mgmt-rest")
protocolPrefix = "http"
)
type managesMetrics interface {
MetricCatalog() ([]core.CatalogedMetric, error)
FetchMetrics([]string, int) ([]core.CatalogedMetric, error)
GetMetric([]string, int) (core.CatalogedMetric, error)
Load(*core.RequestedPlugin) (core.CatalogedPlugin, serror.SnapError)
Unload(core.Plugin) (core.CatalogedPlugin, serror.SnapError)
PluginCatalog() core.PluginCatalog
AvailablePlugins() []core.AvailablePlugin
GetAutodiscoverPaths() []string
}
type managesTasks interface {
CreateTask(cschedule.Schedule, *wmap.WorkflowMap, bool, ...core.TaskOption) (core.Task, core.TaskErrors)
GetTasks() map[string]core.Task
GetTask(string) (core.Task, error)
StartTask(string) []serror.SnapError
StopTask(string) []serror.SnapError
RemoveTask(string) error
WatchTask(string, core.TaskWatcherHandler) (core.TaskWatcherCloser, error)
EnableTask(string) (core.Task, error)
}
type managesTribe interface {
GetAgreement(name string) (*agreement.Agreement, serror.SnapError)
GetAgreements() map[string]*agreement.Agreement
AddAgreement(name string) serror.SnapError
RemoveAgreement(name string) serror.SnapError
JoinAgreement(agreementName, memberName string) serror.SnapError
LeaveAgreement(agreementName, memberName string) serror.SnapError
GetMembers() []string
GetMember(name string) *agreement.Member
}
type managesConfig interface {
GetPluginConfigDataNode(core.PluginType, string, int) cdata.ConfigDataNode
GetPluginConfigDataNodeAll() cdata.ConfigDataNode
MergePluginConfigDataNode(pluginType core.PluginType, name string, ver int, cdn *cdata.ConfigDataNode) cdata.ConfigDataNode
MergePluginConfigDataNodeAll(cdn *cdata.ConfigDataNode) cdata.ConfigDataNode
DeletePluginConfigDataNodeField(pluginType core.PluginType, name string, ver int, fields ...string) cdata.ConfigDataNode
DeletePluginConfigDataNodeFieldAll(fields ...string) cdata.ConfigDataNode
}
type Server struct {
mm managesMetrics
mt managesTasks
tr managesTribe
mc managesConfig
n *negroni.Negroni
r *httprouter.Router
tls *tls
addr net.Addr
err chan error
}
func New(https bool, cpath, kpath string) (*Server, error) {
s := &Server{
err: make(chan error),
}
if https {
var err error
s.tls, err = newtls(cpath, kpath)
if err != nil {
return nil, err
}
protocolPrefix = "https"
}
restLogger.Info(fmt.Sprintf("Configuring REST API with HTTPS set to: %v", https))
s.n = negroni.New(
NewLogger(),
negroni.NewRecovery(),
)
s.r = httprouter.New()
// Use negroni to handle routes
s.n.UseHandler(s.r)
return s, nil
}
func (s *Server) Start(addrString string) error {
s.addRoutes()
return s.run(addrString)
}
func (s *Server) Err() <-chan error {
return s.err
}
func (s *Server) Port() int {
return s.addr.(*net.TCPAddr).Port
}
func (s *Server) run(addrString string) error {
restLogger.Info("Starting REST API on ", addrString)
if s.tls != nil {
go s.serveTLS(addrString)
} else {
ln, err := net.Listen("tcp", addrString)
if err != nil {
return err
}
s.addr = ln.Addr()
go s.serve(ln)
}
return nil
}
func (s *Server) serveTLS(addrString string) {
err := http.ListenAndServeTLS(addrString, s.tls.cert, s.tls.key, s.n)
if err != nil {
restLogger.Error(err)
s.err <- err
}
}
func (s *Server) serve(ln net.Listener) {
err := http.Serve(tcpKeepAliveListener{ln.(*net.TCPListener)}, s.n)
if err != nil {
restLogger.Error(err)
s.err <- err
}
}
// Monkey patch ListenAndServe and TCP alive code from https://golang.org/src/net/http/server.go
// The built in ListenAndServe and ListenAndServeTLS include TCP keepalive
// At this point the Go team is not wanting to provide separate listen and serve methods
// that also provide an exported TCP keepalive per: https://github.com/golang/go/issues/12731
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := ln.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}
func (s *Server) BindMetricManager(m managesMetrics) {
s.mm = m
}
func (s *Server) BindTaskManager(t managesTasks) {
s.mt = t
}
func (s *Server) BindTribeManager(t managesTribe) {
s.tr = t
}
func (s *Server) BindConfigManager(c managesConfig) {
s.mc = c
}
func (s *Server) addRoutes() {
// plugin routes
s.r.GET("/v1/plugins", s.getPlugins)
s.r.GET("/v1/plugins/:type", s.getPluginsByType)
s.r.GET("/v1/plugins/:type/:name", s.getPluginsByName)
s.r.GET("/v1/plugins/:type/:name/:version", s.getPlugin)
s.r.POST("/v1/plugins", s.loadPlugin)
s.r.DELETE("/v1/plugins/:type/:name/:version", s.unloadPlugin)
s.r.GET("/v1/plugins/:type/:name/:version/config", s.getPluginConfigItem)
s.r.PUT("/v1/plugins/:type/:name/:version/config", s.setPluginConfigItem)
s.r.DELETE("/v1/plugins/:type/:name/:version/config", s.deletePluginConfigItem)
// metric routes
s.r.GET("/v1/metrics", s.getMetrics)
s.r.GET("/v1/metrics/*namespace", s.getMetricsFromTree)
// task routes
s.r.GET("/v1/tasks", s.getTasks)
s.r.GET("/v1/tasks/:id", s.getTask)
s.r.GET("/v1/tasks/:id/watch", s.watchTask)
s.r.POST("/v1/tasks", s.addTask)
s.r.PUT("/v1/tasks/:id/start", s.startTask)
s.r.PUT("/v1/tasks/:id/stop", s.stopTask)
s.r.DELETE("/v1/tasks/:id", s.removeTask)
s.r.PUT("/v1/tasks/:id/enable", s.enableTask)
// tribe routes
if s.tr != nil {
s.r.GET("/v1/tribe/agreements", s.getAgreements)
s.r.POST("/v1/tribe/agreements", s.addAgreement)
s.r.GET("/v1/tribe/agreements/:name", s.getAgreement)
s.r.DELETE("/v1/tribe/agreements/:name", s.deleteAgreement)
s.r.PUT("/v1/tribe/agreements/:name/join", s.joinAgreement)
s.r.DELETE("/v1/tribe/agreements/:name/leave", s.leaveAgreement)
s.r.GET("/v1/tribe/members", s.getMembers)
s.r.GET("/v1/tribe/member/:name", s.getMember)
}
}
func respond(code int, b rbody.Body, w http.ResponseWriter) {
resp := &rbody.APIResponse{
Meta: &rbody.APIResponseMeta{
Code: code,
Message: b.ResponseBodyMessage(),
Type: b.ResponseBodyType(),
Version: APIVersion,
},
Body: b,
}
if !w.(negroni.ResponseWriter).Written() {
w.WriteHeader(code)
}
j, err := json.MarshalIndent(resp, "", " ")
if err != nil {
panic(err)
}
fmt.Fprint(w, string(j))
}
func marshalBody(in interface{}, body io.ReadCloser) (int, error) {
b, err := ioutil.ReadAll(body)
if err != nil {
return 500, err
}
err = json.Unmarshal(b, in)
if err != nil {
return 400, err
}
return 0, nil
}
func parseNamespace(ns string) []string {
if strings.Index(ns, "/") == 0 {
ns = ns[1:]
}
if ns[len(ns)-1] == '/' {
ns = ns[:len(ns)-1]
}
return strings.Split(ns, "/")
}