open-consul/command/agent/http.go

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package agent
import (
"bytes"
"encoding/json"
"github.com/hashicorp/consul/consul/structs"
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"io"
"log"
"net"
"net/http"
"strconv"
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"time"
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)
// 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
}
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// NewHTTPServer starts a new HTTP server to provide an interface to
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// the agent.
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func NewHTTPServer(agent *Agent, logOutput io.Writer, bind string) (*HTTPServer, error) {
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// 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),
}
srv.registerHandlers()
// 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() {
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s.mux.HandleFunc("/", s.Index)
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s.mux.HandleFunc("/v1/status/leader", s.wrap(s.StatusLeader))
s.mux.HandleFunc("/v1/status/peers", s.wrap(s.StatusPeers))
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s.mux.HandleFunc("/v1/catalog/register", s.wrap(s.CatalogRegister))
s.mux.HandleFunc("/v1/catalog/deregister", s.wrap(s.CatalogDeregister))
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s.mux.HandleFunc("/v1/catalog/datacenters", s.wrap(s.CatalogDatacenters))
s.mux.HandleFunc("/v1/catalog/nodes", s.wrapQuery(s.CatalogNodes))
s.mux.HandleFunc("/v1/catalog/services", s.wrapQuery(s.CatalogServices))
s.mux.HandleFunc("/v1/catalog/service/", s.wrapQuery(s.CatalogServiceNodes))
s.mux.HandleFunc("/v1/catalog/node/", s.wrapQuery(s.CatalogNodeServices))
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s.mux.HandleFunc("/v1/health/node/", s.wrapQuery(s.HealthNodeChecks))
s.mux.HandleFunc("/v1/health/checks/", s.wrapQuery(s.HealthServiceChecks))
s.mux.HandleFunc("/v1/health/state/", s.wrapQuery(s.HealthChecksInState))
s.mux.HandleFunc("/v1/health/service/", s.wrapQuery(s.HealthServiceNodes))
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s.mux.HandleFunc("/v1/agent/services", s.wrap(s.AgentServices))
s.mux.HandleFunc("/v1/agent/checks", s.wrap(s.AgentChecks))
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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))
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}
// wrap is used to wrap functions to make them more convenient
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func (s *HTTPServer) wrap(handler func(resp http.ResponseWriter, req *http.Request) (interface{}, error)) func(resp http.ResponseWriter, req *http.Request) {
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f := func(resp http.ResponseWriter, req *http.Request) {
// Invoke the handler
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start := time.Now()
defer func() {
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s.logger.Printf("[DEBUG] http: Request %v (%v)", req.URL, time.Now().Sub(start))
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}()
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obj, err := handler(resp, req)
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// Check for an error
HAS_ERR:
if err != nil {
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s.logger.Printf("[ERR] http: Request %v, error: %v", req.URL, err)
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resp.WriteHeader(500)
resp.Write([]byte(err.Error()))
return
}
// Write out the JSON object
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if obj != nil {
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
if err = enc.Encode(obj); err != nil {
goto HAS_ERR
}
resp.Write(buf.Bytes())
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}
}
return f
}
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// wrapQuery is used to wrap query functions to make them more convenient
func (s *HTTPServer) wrapQuery(handler func(resp http.ResponseWriter, req *http.Request) (uint64, interface{}, error)) func(resp http.ResponseWriter, req *http.Request) {
f := func(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
idx, obj, err := handler(resp, req)
setIndex(resp, idx)
return obj, err
}
return s.wrap(f)
}
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// Renders a simple index page
func (s *HTTPServer) Index(resp http.ResponseWriter, req *http.Request) {
if req.URL.Path == "/" {
resp.Write([]byte("Consul Agent"))
} else {
resp.WriteHeader(404)
}
}
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// decodeBody is used to decode a JSON request body
func decodeBody(req *http.Request, out interface{}) error {
dec := json.NewDecoder(req.Body)
return dec.Decode(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))
}
// 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.BlockingQuery) 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
}
// 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.BlockingQuery) bool {
s.parseDC(req, dc)
return parseWait(resp, req, b)
}