open-consul/agent/session_endpoint.go

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package agent
import (
"fmt"
"net/http"
"strings"
"time"
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"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/types"
)
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// sessionCreateResponse is used to wrap the session ID
type sessionCreateResponse struct {
ID string
}
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// SessionCreate is used to create a new session
func (s *HTTPServer) SessionCreate(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Default the session to our node + serf check + release session
// invalidate behavior.
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args := structs.SessionRequest{
Op: structs.SessionCreate,
Session: structs.Session{
Node: s.agent.config.NodeName,
NodeChecks: []string{string(structs.SerfCheckID)},
Checks: []types.CheckID{structs.SerfCheckID},
LockDelay: 15 * time.Second,
Behavior: structs.SessionKeysRelease,
TTL: "",
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},
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
if err := s.parseEntMetaNoWildcard(req, &args.Session.EnterpriseMeta); err != nil {
return nil, err
}
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// Handle optional request body
if req.ContentLength > 0 {
if err := s.rewordUnknownEnterpriseFieldError(lib.DecodeJSON(req.Body, &args.Session)); err != nil {
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resp.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(resp, "Request decode failed: %v", err)
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return nil, nil
}
}
fixupEmptySessionChecks(&args.Session)
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// Create the session, get the ID
var out string
if err := s.agent.RPC("Session.Apply", &args, &out); err != nil {
return nil, err
}
// Format the response as a JSON object
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return sessionCreateResponse{out}, nil
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}
// SessionDestroy is used to destroy an existing session
func (s *HTTPServer) SessionDestroy(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.SessionRequest{
Op: structs.SessionDestroy,
}
s.parseDC(req, &args.Datacenter)
s.parseToken(req, &args.Token)
if err := s.parseEntMetaNoWildcard(req, &args.Session.EnterpriseMeta); err != nil {
return nil, err
}
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// Pull out the session id
args.Session.ID = strings.TrimPrefix(req.URL.Path, "/v1/session/destroy/")
if args.Session.ID == "" {
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resp.WriteHeader(http.StatusBadRequest)
fmt.Fprint(resp, "Missing session")
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return nil, nil
}
var out string
if err := s.agent.RPC("Session.Apply", &args, &out); err != nil {
return nil, err
}
return true, nil
}
// SessionRenew is used to renew the TTL on an existing TTL session
func (s *HTTPServer) SessionRenew(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.SessionSpecificRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := s.parseEntMetaNoWildcard(req, &args.EnterpriseMeta); err != nil {
return nil, err
}
// Pull out the session id
args.SessionID = strings.TrimPrefix(req.URL.Path, "/v1/session/renew/")
if args.SessionID == "" {
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resp.WriteHeader(http.StatusBadRequest)
fmt.Fprint(resp, "Missing session")
return nil, nil
}
var out structs.IndexedSessions
if err := s.agent.RPC("Session.Renew", &args, &out); err != nil {
return nil, err
} else if out.Sessions == nil {
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resp.WriteHeader(http.StatusNotFound)
fmt.Fprintf(resp, "Session id '%s' not found", args.SessionID)
return nil, nil
}
return out.Sessions, nil
}
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// SessionGet is used to get info for a particular session
func (s *HTTPServer) SessionGet(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.SessionSpecificRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := s.parseEntMetaNoWildcard(req, &args.EnterpriseMeta); err != nil {
return nil, err
}
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// Pull out the session id
args.SessionID = strings.TrimPrefix(req.URL.Path, "/v1/session/info/")
if args.SessionID == "" {
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resp.WriteHeader(http.StatusBadRequest)
fmt.Fprint(resp, "Missing session")
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return nil, nil
}
var out structs.IndexedSessions
defer setMeta(resp, &out.QueryMeta)
if err := s.agent.RPC("Session.Get", &args, &out); err != nil {
return nil, err
}
// Use empty list instead of nil
if out.Sessions == nil {
out.Sessions = make(structs.Sessions, 0)
}
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return out.Sessions, nil
}
// SessionList is used to list all the sessions
func (s *HTTPServer) SessionList(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.SessionSpecificRequest{}
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if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil {
return nil, err
}
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var out structs.IndexedSessions
defer setMeta(resp, &out.QueryMeta)
if err := s.agent.RPC("Session.List", &args, &out); err != nil {
return nil, err
}
// Use empty list instead of nil
if out.Sessions == nil {
out.Sessions = make(structs.Sessions, 0)
}
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return out.Sessions, nil
}
// SessionsForNode returns all the nodes belonging to a node
func (s *HTTPServer) SessionsForNode(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
args := structs.NodeSpecificRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil {
return nil, err
}
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// Pull out the node name
args.Node = strings.TrimPrefix(req.URL.Path, "/v1/session/node/")
if args.Node == "" {
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resp.WriteHeader(http.StatusBadRequest)
fmt.Fprint(resp, "Missing node name")
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return nil, nil
}
var out structs.IndexedSessions
defer setMeta(resp, &out.QueryMeta)
if err := s.agent.RPC("Session.NodeSessions", &args, &out); err != nil {
return nil, err
}
// Use empty list instead of nil
if out.Sessions == nil {
out.Sessions = make(structs.Sessions, 0)
}
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return out.Sessions, nil
}
// This is for backwards compatibility. Prior to 1.7.0 users could create a session with no Checks
// by passing an empty Checks field. Now the preferred field is session.NodeChecks.
func fixupEmptySessionChecks(session *structs.Session) {
// If the Checks field contains an empty slice, empty out the default check that was provided to NodeChecks
if len(session.Checks) == 0 {
session.NodeChecks = make([]string, 0)
return
}
// If the checks field contains the default value, empty it out. Defer to what is in NodeChecks.
if len(session.Checks) == 1 && session.Checks[0] == structs.SerfCheckID {
session.Checks = nil
return
}
// If the NodeChecks field contains an empty slice, empty out the default check that was provided to Checks
if len(session.NodeChecks) == 0 {
session.Checks = nil
return
}
return
}