604 lines
19 KiB
Go
604 lines
19 KiB
Go
package agent
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import (
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"crypto/tls"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"net/http/pprof"
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"net/url"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/armon/go-metrics"
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"github.com/hashicorp/consul/consul/structs"
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"github.com/hashicorp/consul/tlsutil"
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"github.com/mitchellh/mapstructure"
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)
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var (
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// scadaHTTPAddr is the address associated with the
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// HTTPServer. When populating an ACL token for a request,
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// this is checked to switch between the ACLToken and
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// AtlasACLToken
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scadaHTTPAddr = "SCADA"
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)
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// HTTPServer is used to wrap an Agent and expose various API's
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// in a RESTful manner
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type HTTPServer struct {
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agent *Agent
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mux *http.ServeMux
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listener net.Listener
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logger *log.Logger
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uiDir string
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addr string
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}
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// NewHTTPServers starts new HTTP servers to provide an interface to
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// the agent.
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func NewHTTPServers(agent *Agent, config *Config, logOutput io.Writer) ([]*HTTPServer, error) {
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if logOutput == nil {
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return nil, fmt.Errorf("Please provide a valid logOutput(io.Writer)")
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}
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var servers []*HTTPServer
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if config.Ports.HTTPS > 0 {
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httpAddr, err := config.ClientListener(config.Addresses.HTTPS, config.Ports.HTTPS)
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if err != nil {
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return nil, err
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}
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tlsConf := &tlsutil.Config{
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VerifyIncoming: config.VerifyIncoming,
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VerifyOutgoing: config.VerifyOutgoing,
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CAFile: config.CAFile,
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CertFile: config.CertFile,
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KeyFile: config.KeyFile,
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NodeName: config.NodeName,
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ServerName: config.ServerName}
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tlsConfig, err := tlsConf.IncomingTLSConfig()
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if err != nil {
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return nil, err
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}
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ln, err := net.Listen(httpAddr.Network(), httpAddr.String())
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if err != nil {
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return nil, fmt.Errorf("Failed to get Listen on %s: %v", httpAddr.String(), err)
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}
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list := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, tlsConfig)
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// Create the mux
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mux := http.NewServeMux()
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// Create the server
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srv := &HTTPServer{
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agent: agent,
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mux: mux,
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listener: list,
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logger: log.New(logOutput, "", log.LstdFlags),
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uiDir: config.UiDir,
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addr: httpAddr.String(),
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}
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srv.registerHandlers(config.EnableDebug)
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// Start the server
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go http.Serve(list, mux)
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servers = append(servers, srv)
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}
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if config.Ports.HTTP > 0 {
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httpAddr, err := config.ClientListener(config.Addresses.HTTP, config.Ports.HTTP)
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if err != nil {
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return nil, fmt.Errorf("Failed to get ClientListener address:port: %v", err)
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}
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// Error if we are trying to bind a domain socket to an existing path
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socketPath, isSocket := unixSocketAddr(config.Addresses.HTTP)
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if isSocket {
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if _, err := os.Stat(socketPath); !os.IsNotExist(err) {
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agent.logger.Printf("[WARN] agent: Replacing socket %q", socketPath)
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}
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if err := os.Remove(socketPath); err != nil && !os.IsNotExist(err) {
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return nil, fmt.Errorf("error removing socket file: %s", err)
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}
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}
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ln, err := net.Listen(httpAddr.Network(), httpAddr.String())
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if err != nil {
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return nil, fmt.Errorf("Failed to get Listen on %s: %v", httpAddr.String(), err)
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}
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var list net.Listener
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if isSocket {
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// Set up ownership/permission bits on the socket file
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if err := setFilePermissions(socketPath, config.UnixSockets); err != nil {
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return nil, fmt.Errorf("Failed setting up HTTP socket: %s", err)
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}
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list = ln
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} else {
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list = tcpKeepAliveListener{ln.(*net.TCPListener)}
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}
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// Create the mux
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mux := http.NewServeMux()
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// Create the server
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srv := &HTTPServer{
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agent: agent,
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mux: mux,
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listener: list,
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logger: log.New(logOutput, "", log.LstdFlags),
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uiDir: config.UiDir,
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addr: httpAddr.String(),
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}
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srv.registerHandlers(config.EnableDebug)
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// Start the server
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go http.Serve(list, mux)
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servers = append(servers, srv)
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}
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return servers, nil
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}
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// newScadaHttp creates a new HTTP server wrapping the SCADA
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// listener such that HTTP calls can be sent from the brokers.
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func newScadaHttp(agent *Agent, list net.Listener) *HTTPServer {
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// Create the mux
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mux := http.NewServeMux()
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// Create the server
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srv := &HTTPServer{
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agent: agent,
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mux: mux,
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listener: list,
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logger: agent.logger,
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addr: scadaHTTPAddr,
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}
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srv.registerHandlers(false) // Never allow debug for SCADA
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// Start the server
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go http.Serve(list, mux)
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return srv
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}
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// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
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// connections. It's used by NewHttpServer so
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// dead TCP connections eventually go away.
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type tcpKeepAliveListener struct {
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*net.TCPListener
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}
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func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
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tc, err := ln.AcceptTCP()
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if err != nil {
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return
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}
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tc.SetKeepAlive(true)
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tc.SetKeepAlivePeriod(30 * time.Second)
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return tc, nil
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}
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// Shutdown is used to shutdown the HTTP server
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func (s *HTTPServer) Shutdown() {
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if s != nil {
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s.logger.Printf("[DEBUG] http: Shutting down http server (%v)", s.addr)
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s.listener.Close()
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}
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}
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// handleFuncMetrics takes the given pattern and handler and wraps to produce
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// metrics based on the pattern and request.
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func (s *HTTPServer) handleFuncMetrics(pattern string, handler func(http.ResponseWriter, *http.Request)) {
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// Get the parts of the pattern. We omit any initial empty for the
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// leading slash, and put an underscore as a "thing" placeholder if we
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// see a trailing slash, which means the part after is parsed. This lets
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// us distinguish from things like /v1/query and /v1/query/<query id>.
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var parts []string
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for i, part := range strings.Split(pattern, "/") {
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if part == "" {
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if i == 0 {
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continue
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} else {
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part = "_"
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}
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}
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parts = append(parts, part)
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}
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// Register the wrapper, which will close over the expensive-to-compute
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// parts from above.
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wrapper := func(resp http.ResponseWriter, req *http.Request) {
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start := time.Now()
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handler(resp, req)
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key := append([]string{"consul", "http", req.Method}, parts...)
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metrics.MeasureSince(key, start)
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}
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s.mux.HandleFunc(pattern, wrapper)
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}
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// registerHandlers is used to attach our handlers to the mux
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func (s *HTTPServer) registerHandlers(enableDebug bool) {
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s.mux.HandleFunc("/", s.Index)
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s.handleFuncMetrics("/v1/status/leader", s.wrap(s.StatusLeader))
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s.handleFuncMetrics("/v1/status/peers", s.wrap(s.StatusPeers))
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s.handleFuncMetrics("/v1/operator/raft/configuration", s.wrap(s.OperatorRaftConfiguration))
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s.handleFuncMetrics("/v1/operator/raft/peer", s.wrap(s.OperatorRaftPeer))
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s.handleFuncMetrics("/v1/catalog/register", s.wrap(s.CatalogRegister))
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s.handleFuncMetrics("/v1/catalog/deregister", s.wrap(s.CatalogDeregister))
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s.handleFuncMetrics("/v1/catalog/datacenters", s.wrap(s.CatalogDatacenters))
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s.handleFuncMetrics("/v1/catalog/nodes", s.wrap(s.CatalogNodes))
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s.handleFuncMetrics("/v1/catalog/services", s.wrap(s.CatalogServices))
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s.handleFuncMetrics("/v1/catalog/service/", s.wrap(s.CatalogServiceNodes))
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s.handleFuncMetrics("/v1/catalog/node/", s.wrap(s.CatalogNodeServices))
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if !s.agent.config.DisableCoordinates {
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s.handleFuncMetrics("/v1/coordinate/datacenters", s.wrap(s.CoordinateDatacenters))
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s.handleFuncMetrics("/v1/coordinate/nodes", s.wrap(s.CoordinateNodes))
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} else {
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s.handleFuncMetrics("/v1/coordinate/datacenters", s.wrap(coordinateDisabled))
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s.handleFuncMetrics("/v1/coordinate/nodes", s.wrap(coordinateDisabled))
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}
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s.handleFuncMetrics("/v1/health/node/", s.wrap(s.HealthNodeChecks))
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s.handleFuncMetrics("/v1/health/checks/", s.wrap(s.HealthServiceChecks))
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s.handleFuncMetrics("/v1/health/state/", s.wrap(s.HealthChecksInState))
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s.handleFuncMetrics("/v1/health/service/", s.wrap(s.HealthServiceNodes))
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s.handleFuncMetrics("/v1/agent/self", s.wrap(s.AgentSelf))
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s.handleFuncMetrics("/v1/agent/maintenance", s.wrap(s.AgentNodeMaintenance))
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s.handleFuncMetrics("/v1/agent/services", s.wrap(s.AgentServices))
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s.handleFuncMetrics("/v1/agent/checks", s.wrap(s.AgentChecks))
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s.handleFuncMetrics("/v1/agent/members", s.wrap(s.AgentMembers))
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s.handleFuncMetrics("/v1/agent/join/", s.wrap(s.AgentJoin))
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s.handleFuncMetrics("/v1/agent/force-leave/", s.wrap(s.AgentForceLeave))
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s.handleFuncMetrics("/v1/agent/check/register", s.wrap(s.AgentRegisterCheck))
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s.handleFuncMetrics("/v1/agent/check/deregister/", s.wrap(s.AgentDeregisterCheck))
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s.handleFuncMetrics("/v1/agent/check/pass/", s.wrap(s.AgentCheckPass))
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s.handleFuncMetrics("/v1/agent/check/warn/", s.wrap(s.AgentCheckWarn))
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s.handleFuncMetrics("/v1/agent/check/fail/", s.wrap(s.AgentCheckFail))
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s.handleFuncMetrics("/v1/agent/check/update/", s.wrap(s.AgentCheckUpdate))
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s.handleFuncMetrics("/v1/agent/service/register", s.wrap(s.AgentRegisterService))
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s.handleFuncMetrics("/v1/agent/service/deregister/", s.wrap(s.AgentDeregisterService))
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s.handleFuncMetrics("/v1/agent/service/maintenance/", s.wrap(s.AgentServiceMaintenance))
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s.handleFuncMetrics("/v1/event/fire/", s.wrap(s.EventFire))
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s.handleFuncMetrics("/v1/event/list", s.wrap(s.EventList))
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s.handleFuncMetrics("/v1/kv/", s.wrap(s.KVSEndpoint))
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s.handleFuncMetrics("/v1/session/create", s.wrap(s.SessionCreate))
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s.handleFuncMetrics("/v1/session/destroy/", s.wrap(s.SessionDestroy))
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s.handleFuncMetrics("/v1/session/renew/", s.wrap(s.SessionRenew))
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s.handleFuncMetrics("/v1/session/info/", s.wrap(s.SessionGet))
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s.handleFuncMetrics("/v1/session/node/", s.wrap(s.SessionsForNode))
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s.handleFuncMetrics("/v1/session/list", s.wrap(s.SessionList))
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if s.agent.config.ACLDatacenter != "" {
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s.handleFuncMetrics("/v1/acl/create", s.wrap(s.ACLCreate))
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s.handleFuncMetrics("/v1/acl/update", s.wrap(s.ACLUpdate))
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s.handleFuncMetrics("/v1/acl/destroy/", s.wrap(s.ACLDestroy))
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s.handleFuncMetrics("/v1/acl/info/", s.wrap(s.ACLGet))
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s.handleFuncMetrics("/v1/acl/clone/", s.wrap(s.ACLClone))
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s.handleFuncMetrics("/v1/acl/list", s.wrap(s.ACLList))
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s.handleFuncMetrics("/v1/acl/replication", s.wrap(s.ACLReplicationStatus))
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} else {
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s.handleFuncMetrics("/v1/acl/create", s.wrap(aclDisabled))
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s.handleFuncMetrics("/v1/acl/update", s.wrap(aclDisabled))
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s.handleFuncMetrics("/v1/acl/destroy/", s.wrap(aclDisabled))
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s.handleFuncMetrics("/v1/acl/info/", s.wrap(aclDisabled))
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s.handleFuncMetrics("/v1/acl/clone/", s.wrap(aclDisabled))
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s.handleFuncMetrics("/v1/acl/list", s.wrap(aclDisabled))
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s.handleFuncMetrics("/v1/acl/replication", s.wrap(aclDisabled))
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}
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s.handleFuncMetrics("/v1/query", s.wrap(s.PreparedQueryGeneral))
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s.handleFuncMetrics("/v1/query/", s.wrap(s.PreparedQuerySpecific))
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s.handleFuncMetrics("/v1/txn", s.wrap(s.Txn))
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if enableDebug {
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s.handleFuncMetrics("/debug/pprof/", pprof.Index)
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s.handleFuncMetrics("/debug/pprof/cmdline", pprof.Cmdline)
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s.handleFuncMetrics("/debug/pprof/profile", pprof.Profile)
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s.handleFuncMetrics("/debug/pprof/symbol", pprof.Symbol)
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}
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// Use the custom UI dir if provided.
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if s.uiDir != "" {
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s.mux.Handle("/ui/", http.StripPrefix("/ui/", http.FileServer(http.Dir(s.uiDir))))
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} else if s.agent.config.EnableUi {
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s.mux.Handle("/ui/", http.StripPrefix("/ui/", http.FileServer(assetFS())))
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}
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// API's are under /internal/ui/ to avoid conflict
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s.handleFuncMetrics("/v1/internal/ui/nodes", s.wrap(s.UINodes))
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s.handleFuncMetrics("/v1/internal/ui/node/", s.wrap(s.UINodeInfo))
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s.handleFuncMetrics("/v1/internal/ui/services", s.wrap(s.UIServices))
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}
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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) {
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setHeaders(resp, s.agent.config.HTTPAPIResponseHeaders)
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setTranslateAddr(resp, s.agent.config.TranslateWanAddrs)
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// Obfuscate any tokens from appearing in the logs
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formVals, err := url.ParseQuery(req.URL.RawQuery)
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if err != nil {
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s.logger.Printf("[ERR] http: Failed to decode query: %s from=%s", err, req.RemoteAddr)
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resp.WriteHeader(http.StatusInternalServerError) // 500
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return
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}
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logURL := req.URL.String()
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if tokens, ok := formVals["token"]; ok {
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for _, token := range tokens {
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if token == "" {
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logURL += "<hidden>"
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continue
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}
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logURL = strings.Replace(logURL, token, "<hidden>", -1)
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}
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}
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// TODO (slackpad) We may want to consider redacting prepared
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// query names/IDs here since they are proxies for tokens. But,
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// knowing one only gives you read access to service listings
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// which is pretty trivial, so it's probably not worth the code
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// complexity and overhead of filtering them out. You can't
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// recover the token it's a proxy for with just the query info;
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// you'd need the actual token (or a management token) to read
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// that back.
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// Invoke the handler
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start := time.Now()
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defer func() {
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s.logger.Printf("[DEBUG] http: Request %s %v (%v) from=%s", req.Method, logURL, time.Now().Sub(start), req.RemoteAddr)
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}()
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obj, err := handler(resp, req)
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// Check for an error
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HAS_ERR:
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if err != nil {
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s.logger.Printf("[ERR] http: Request %s %v, error: %v from=%s", req.Method, logURL, err, req.RemoteAddr)
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code := http.StatusInternalServerError // 500
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errMsg := err.Error()
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if strings.Contains(errMsg, "Permission denied") || strings.Contains(errMsg, "ACL not found") {
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code = http.StatusForbidden // 403
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}
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resp.WriteHeader(code)
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resp.Write([]byte(err.Error()))
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return
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}
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if obj != nil {
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var buf []byte
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buf, err = s.marshalJSON(req, obj)
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if err != nil {
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goto HAS_ERR
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}
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resp.Header().Set("Content-Type", "application/json")
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resp.Write(buf)
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}
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}
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return f
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}
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// marshalJSON marshals the object into JSON, respecting the user's pretty-ness
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// configuration.
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func (s *HTTPServer) marshalJSON(req *http.Request, obj interface{}) ([]byte, error) {
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if _, ok := req.URL.Query()["pretty"]; ok {
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buf, err := json.MarshalIndent(obj, "", " ")
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if err != nil {
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return nil, err
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}
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buf = append(buf, "\n"...)
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return buf, nil
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}
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buf, err := json.Marshal(obj)
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if err != nil {
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return nil, err
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}
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return buf, err
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}
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// Returns true if the UI is enabled.
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func (s *HTTPServer) IsUIEnabled() bool {
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return s.uiDir != "" || s.agent.config.EnableUi
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}
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// Renders a simple index page
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func (s *HTTPServer) Index(resp http.ResponseWriter, req *http.Request) {
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// Check if this is a non-index path
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if req.URL.Path != "/" {
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resp.WriteHeader(http.StatusNotFound) // 404
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return
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}
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// Give them something helpful if there's no UI so they at least know
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// what this server is.
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if !s.IsUIEnabled() {
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resp.Write([]byte("Consul Agent"))
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return
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}
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// Redirect to the UI endpoint
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http.Redirect(resp, req, "/ui/", http.StatusMovedPermanently) // 301
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}
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// decodeBody is used to decode a JSON request body
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func decodeBody(req *http.Request, out interface{}, cb func(interface{}) error) error {
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var raw interface{}
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dec := json.NewDecoder(req.Body)
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if err := dec.Decode(&raw); err != nil {
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return err
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}
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// Invoke the callback prior to decode
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if cb != nil {
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if err := cb(raw); err != nil {
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return err
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}
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}
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return mapstructure.Decode(raw, out)
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}
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// setTranslateAddr is used to set the address translation header. This is only
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// present if the feature is active.
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func setTranslateAddr(resp http.ResponseWriter, active bool) {
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if active {
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resp.Header().Set("X-Consul-Translate-Addresses", "true")
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}
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}
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// setIndex is used to set the index response header
|
|
func setIndex(resp http.ResponseWriter, index uint64) {
|
|
resp.Header().Set("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().Set("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().Set("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)
|
|
}
|
|
|
|
// setHeaders is used to set canonical response header fields
|
|
func setHeaders(resp http.ResponseWriter, headers map[string]string) {
|
|
for field, value := range headers {
|
|
resp.Header().Set(http.CanonicalHeaderKey(field), value)
|
|
}
|
|
}
|
|
|
|
// 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(http.StatusBadRequest) // 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(http.StatusBadRequest) // 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(http.StatusBadRequest) // 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
|
|
}
|
|
}
|
|
|
|
// parseToken is used to parse the ?token query param or the X-Consul-Token header
|
|
func (s *HTTPServer) parseToken(req *http.Request, token *string) {
|
|
if other := req.URL.Query().Get("token"); other != "" {
|
|
*token = other
|
|
return
|
|
}
|
|
|
|
if other := req.Header.Get("X-Consul-Token"); other != "" {
|
|
*token = other
|
|
return
|
|
}
|
|
|
|
// Set the AtlasACLToken if SCADA
|
|
if s.addr == scadaHTTPAddr && s.agent.config.AtlasACLToken != "" {
|
|
*token = s.agent.config.AtlasACLToken
|
|
return
|
|
}
|
|
|
|
// Set the default ACLToken
|
|
*token = s.agent.config.ACLToken
|
|
}
|
|
|
|
// parseSource is used to parse the ?near=<node> query parameter, used for
|
|
// sorting by RTT based on a source node. We set the source's DC to the target
|
|
// DC in the request, if given, or else the agent's DC.
|
|
func (s *HTTPServer) parseSource(req *http.Request, source *structs.QuerySource) {
|
|
s.parseDC(req, &source.Datacenter)
|
|
if node := req.URL.Query().Get("near"); node != "" {
|
|
if node == "_agent" {
|
|
source.Node = s.agent.config.NodeName
|
|
} else {
|
|
source.Node = node
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
s.parseToken(req, &b.Token)
|
|
if parseConsistency(resp, req, b) {
|
|
return true
|
|
}
|
|
return parseWait(resp, req, b)
|
|
}
|