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http.go
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http.go
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package agent
import (
"bytes"
"encoding/json"
"github.com/hashicorp/consul/consul/structs"
"github.com/mitchellh/mapstructure"
"io"
"log"
"net"
"net/http"
"net/http/pprof"
"strconv"
"time"
)
// HTTPServer is used to wrap an Agent and expose various API's
// in a RESTful manner
type HTTPServer struct {
agent *Agent
mux *http.ServeMux
listener net.Listener
logger *log.Logger
uiDir string
}
// NewHTTPServer starts a new HTTP server to provide an interface to
// the agent.
func NewHTTPServer(agent *Agent, uiDir string, enableDebug bool, logOutput io.Writer, bind string) (*HTTPServer, error) {
// Create the mux
mux := http.NewServeMux()
// Create listener
list, err := net.Listen("tcp", bind)
if err != nil {
return nil, err
}
// Create the server
srv := &HTTPServer{
agent: agent,
mux: mux,
listener: list,
logger: log.New(logOutput, "", log.LstdFlags),
uiDir: uiDir,
}
srv.registerHandlers(enableDebug)
// Start the server
go http.Serve(list, mux)
return srv, nil
}
// Shutdown is used to shutdown the HTTP server
func (s *HTTPServer) Shutdown() {
s.listener.Close()
}
// registerHandlers is used to attach our handlers to the mux
func (s *HTTPServer) registerHandlers(enableDebug bool) {
s.mux.HandleFunc("/", s.Index)
s.mux.HandleFunc("/v1/status/leader", s.wrap(s.StatusLeader))
s.mux.HandleFunc("/v1/status/peers", s.wrap(s.StatusPeers))
s.mux.HandleFunc("/v1/catalog/register", s.wrap(s.CatalogRegister))
s.mux.HandleFunc("/v1/catalog/deregister", s.wrap(s.CatalogDeregister))
s.mux.HandleFunc("/v1/catalog/datacenters", s.wrap(s.CatalogDatacenters))
s.mux.HandleFunc("/v1/catalog/nodes", s.wrap(s.CatalogNodes))
s.mux.HandleFunc("/v1/catalog/services", s.wrap(s.CatalogServices))
s.mux.HandleFunc("/v1/catalog/service/", s.wrap(s.CatalogServiceNodes))
s.mux.HandleFunc("/v1/catalog/node/", s.wrap(s.CatalogNodeServices))
s.mux.HandleFunc("/v1/health/node/", s.wrap(s.HealthNodeChecks))
s.mux.HandleFunc("/v1/health/checks/", s.wrap(s.HealthServiceChecks))
s.mux.HandleFunc("/v1/health/state/", s.wrap(s.HealthChecksInState))
s.mux.HandleFunc("/v1/health/service/", s.wrap(s.HealthServiceNodes))
s.mux.HandleFunc("/v1/agent/services", s.wrap(s.AgentServices))
s.mux.HandleFunc("/v1/agent/checks", s.wrap(s.AgentChecks))
s.mux.HandleFunc("/v1/agent/members", s.wrap(s.AgentMembers))
s.mux.HandleFunc("/v1/agent/join/", s.wrap(s.AgentJoin))
s.mux.HandleFunc("/v1/agent/force-leave/", s.wrap(s.AgentForceLeave))
s.mux.HandleFunc("/v1/agent/check/register", s.wrap(s.AgentRegisterCheck))
s.mux.HandleFunc("/v1/agent/check/deregister/", s.wrap(s.AgentDeregisterCheck))
s.mux.HandleFunc("/v1/agent/check/pass/", s.wrap(s.AgentCheckPass))
s.mux.HandleFunc("/v1/agent/check/warn/", s.wrap(s.AgentCheckWarn))
s.mux.HandleFunc("/v1/agent/check/fail/", s.wrap(s.AgentCheckFail))
s.mux.HandleFunc("/v1/agent/service/register", s.wrap(s.AgentRegisterService))
s.mux.HandleFunc("/v1/agent/service/deregister/", s.wrap(s.AgentDeregisterService))
s.mux.HandleFunc("/v1/kv/", s.wrap(s.KVSEndpoint))
if enableDebug {
s.mux.HandleFunc("/debug/pprof/", pprof.Index)
s.mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
s.mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
s.mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
}
// Enable the UI + special endpoints
if s.uiDir != "" {
// Static file serving done from /ui/
s.mux.Handle("/ui/", http.StripPrefix("/ui/", http.FileServer(http.Dir(s.uiDir))))
// API's are under /internal/ui/ to avoid conflict
s.mux.HandleFunc("/v1/internal/ui/nodes", s.wrap(s.UINodes))
s.mux.HandleFunc("/v1/internal/ui/node/", s.wrap(s.UINodeInfo))
s.mux.HandleFunc("/v1/internal/ui/services", s.wrap(s.UIServices))
}
}
// wrap is used to wrap functions to make them more convenient
func (s *HTTPServer) wrap(handler func(resp http.ResponseWriter, req *http.Request) (interface{}, error)) func(resp http.ResponseWriter, req *http.Request) {
f := func(resp http.ResponseWriter, req *http.Request) {
// Invoke the handler
start := time.Now()
defer func() {
s.logger.Printf("[DEBUG] http: Request %v (%v)", req.URL, time.Now().Sub(start))
}()
obj, err := handler(resp, req)
// Check for an error
HAS_ERR:
if err != nil {
s.logger.Printf("[ERR] http: Request %v, error: %v", req.URL, err)
resp.WriteHeader(500)
resp.Write([]byte(err.Error()))
return
}
// Write out the JSON object
if obj != nil {
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
if err = enc.Encode(obj); err != nil {
goto HAS_ERR
}
resp.Header().Set("Content-Type", "application/json")
resp.Write(buf.Bytes())
}
}
return f
}
// Renders a simple index page
func (s *HTTPServer) Index(resp http.ResponseWriter, req *http.Request) {
// Check if this is a non-index path
if req.URL.Path != "/" {
resp.WriteHeader(404)
return
}
// Check if we have no UI configured
if s.uiDir == "" {
resp.Write([]byte("Consul Agent"))
return
}
// Redirect to the UI endpoint
http.Redirect(resp, req, "/ui/", 301)
}
// decodeBody is used to decode a JSON request body
func decodeBody(req *http.Request, out interface{}, cb func(interface{}) error) error {
var raw interface{}
dec := json.NewDecoder(req.Body)
if err := dec.Decode(&raw); err != nil {
return err
}
// Invoke the callback prior to decode
if cb != nil {
if err := cb(raw); err != nil {
return err
}
}
return mapstructure.Decode(raw, out)
}
// setIndex is used to set the index response header
func setIndex(resp http.ResponseWriter, index uint64) {
resp.Header().Add("X-Consul-Index", strconv.FormatUint(index, 10))
}
// setKnownLeader is used to set the known leader header
func setKnownLeader(resp http.ResponseWriter, known bool) {
s := "true"
if !known {
s = "false"
}
resp.Header().Add("X-Consul-KnownLeader", s)
}
// setLastContact is used to set the last contact header
func setLastContact(resp http.ResponseWriter, last time.Duration) {
lastMsec := uint64(last / time.Millisecond)
resp.Header().Add("X-Consul-LastContact", strconv.FormatUint(lastMsec, 10))
}
// setMeta is used to set the query response meta data
func setMeta(resp http.ResponseWriter, m *structs.QueryMeta) {
setIndex(resp, m.Index)
setLastContact(resp, m.LastContact)
setKnownLeader(resp, m.KnownLeader)
}
// parseWait is used to parse the ?wait and ?index query params
// Returns true on error
func parseWait(resp http.ResponseWriter, req *http.Request, b *structs.QueryOptions) bool {
query := req.URL.Query()
if wait := query.Get("wait"); wait != "" {
dur, err := time.ParseDuration(wait)
if err != nil {
resp.WriteHeader(400)
resp.Write([]byte("Invalid wait time"))
return true
}
b.MaxQueryTime = dur
}
if idx := query.Get("index"); idx != "" {
index, err := strconv.ParseUint(idx, 10, 64)
if err != nil {
resp.WriteHeader(400)
resp.Write([]byte("Invalid index"))
return true
}
b.MinQueryIndex = index
}
return false
}
// parseConsistency is used to parse the ?stale and ?consistent query params.
// Returns true on error
func parseConsistency(resp http.ResponseWriter, req *http.Request, b *structs.QueryOptions) bool {
query := req.URL.Query()
if _, ok := query["stale"]; ok {
b.AllowStale = true
}
if _, ok := query["consistent"]; ok {
b.RequireConsistent = true
}
if b.AllowStale && b.RequireConsistent {
resp.WriteHeader(400)
resp.Write([]byte("Cannot specify ?stale with ?consistent, conflicting semantics."))
return true
}
return false
}
// parseDC is used to parse the ?dc query param
func (s *HTTPServer) parseDC(req *http.Request, dc *string) {
if other := req.URL.Query().Get("dc"); other != "" {
*dc = other
} else if *dc == "" {
*dc = s.agent.config.Datacenter
}
}
// parse is a convenience method for endpoints that need
// to use both parseWait and parseDC.
func (s *HTTPServer) parse(resp http.ResponseWriter, req *http.Request, dc *string, b *structs.QueryOptions) bool {
s.parseDC(req, dc)
if parseConsistency(resp, req, b) {
return true
}
return parseWait(resp, req, b)
}