697 lines
19 KiB
Go
697 lines
19 KiB
Go
package agent
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net"
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"net/http"
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"strconv"
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"strings"
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"github.com/golang/snappy"
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"github.com/gorilla/websocket"
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"github.com/hashicorp/go-msgpack/codec"
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cstructs "github.com/hashicorp/nomad/client/structs"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/hashicorp/nomad/plugins/drivers"
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)
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const (
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allocNotFoundErr = "allocation not found"
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resourceNotFoundErr = "resource not found"
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)
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func (s *HTTPServer) AllocsRequest(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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if req.Method != "GET" {
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return nil, CodedError(405, ErrInvalidMethod)
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}
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args := structs.AllocListRequest{}
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if s.parse(resp, req, &args.Region, &args.QueryOptions) {
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return nil, nil
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}
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// Parse resources and task_states field selection
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resources, err := parseBool(req, "resources")
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if err != nil {
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return nil, err
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}
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taskStates, err := parseBool(req, "task_states")
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if err != nil {
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return nil, err
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}
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if resources != nil || taskStates != nil {
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args.Fields = structs.NewAllocStubFields()
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if resources != nil {
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args.Fields.Resources = *resources
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}
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if taskStates != nil {
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args.Fields.TaskStates = *taskStates
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}
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}
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var out structs.AllocListResponse
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if err := s.agent.RPC("Alloc.List", &args, &out); err != nil {
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return nil, err
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}
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setMeta(resp, &out.QueryMeta)
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if out.Allocations == nil {
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out.Allocations = make([]*structs.AllocListStub, 0)
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}
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for _, alloc := range out.Allocations {
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alloc.SetEventDisplayMessages()
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}
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return out.Allocations, nil
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}
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func (s *HTTPServer) AllocSpecificRequest(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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reqSuffix := strings.TrimPrefix(req.URL.Path, "/v1/allocation/")
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// tokenize the suffix of the path to get the alloc id and find the action
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// invoked on the alloc id
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tokens := strings.Split(reqSuffix, "/")
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if len(tokens) > 2 || len(tokens) < 1 {
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return nil, CodedError(404, resourceNotFoundErr)
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}
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allocID := tokens[0]
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if len(tokens) == 1 {
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return s.allocGet(allocID, resp, req)
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}
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switch tokens[1] {
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case "checks":
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return s.allocChecks(allocID, resp, req)
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case "stop":
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return s.allocStop(allocID, resp, req)
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case "services":
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return s.allocServiceRegistrations(resp, req, allocID)
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}
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return nil, CodedError(404, resourceNotFoundErr)
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}
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func (s *HTTPServer) allocGet(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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if req.Method != "GET" {
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return nil, CodedError(405, ErrInvalidMethod)
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}
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args := structs.AllocSpecificRequest{
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AllocID: allocID,
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}
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if s.parse(resp, req, &args.Region, &args.QueryOptions) {
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return nil, nil
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}
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var out structs.SingleAllocResponse
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if err := s.agent.RPC("Alloc.GetAlloc", &args, &out); err != nil {
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return nil, err
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}
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setMeta(resp, &out.QueryMeta)
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if out.Alloc == nil {
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return nil, CodedError(404, "alloc not found")
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}
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// Decode the payload if there is any
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alloc := out.Alloc
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if alloc.Job != nil && len(alloc.Job.Payload) != 0 {
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decoded, err := snappy.Decode(nil, alloc.Job.Payload)
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if err != nil {
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return nil, err
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}
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alloc = alloc.Copy()
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alloc.Job.Payload = decoded
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}
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alloc.SetEventDisplayMessages()
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// Handle 0.12 ports upgrade path
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alloc = alloc.Copy()
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alloc.AllocatedResources.Canonicalize()
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return alloc, nil
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}
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func (s *HTTPServer) allocStop(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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if !(req.Method == "POST" || req.Method == "PUT") {
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return nil, CodedError(405, ErrInvalidMethod)
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}
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noShutdownDelay := false
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if noShutdownDelayQS := req.URL.Query().Get("no_shutdown_delay"); noShutdownDelayQS != "" {
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var err error
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noShutdownDelay, err = strconv.ParseBool(noShutdownDelayQS)
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if err != nil {
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return nil, fmt.Errorf("no_shutdown_delay value is not a boolean: %v", err)
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}
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}
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sr := &structs.AllocStopRequest{
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AllocID: allocID,
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NoShutdownDelay: noShutdownDelay,
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}
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s.parseWriteRequest(req, &sr.WriteRequest)
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var out structs.AllocStopResponse
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rpcErr := s.agent.RPC("Alloc.Stop", &sr, &out)
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if rpcErr != nil {
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if structs.IsErrUnknownAllocation(rpcErr) {
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rpcErr = CodedError(404, allocNotFoundErr)
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}
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return nil, rpcErr
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}
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setIndex(resp, out.Index)
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return &out, nil
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}
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// allocServiceRegistrations returns a list of all service registrations
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// assigned to the job identifier. It is callable via the
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// /v1/allocation/:alloc_id/services HTTP API and uses the
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// structs.AllocServiceRegistrationsRPCMethod RPC method.
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func (s *HTTPServer) allocServiceRegistrations(
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resp http.ResponseWriter, req *http.Request, allocID string) (interface{}, error) {
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// The endpoint only supports GET requests.
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if req.Method != http.MethodGet {
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return nil, CodedError(http.StatusMethodNotAllowed, ErrInvalidMethod)
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}
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// Set up the request args and parse this to ensure the query options are
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// set.
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args := structs.AllocServiceRegistrationsRequest{AllocID: allocID}
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if s.parse(resp, req, &args.Region, &args.QueryOptions) {
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return nil, nil
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}
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// Perform the RPC request.
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var reply structs.AllocServiceRegistrationsResponse
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if err := s.agent.RPC(structs.AllocServiceRegistrationsRPCMethod, &args, &reply); err != nil {
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return nil, err
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}
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setMeta(resp, &reply.QueryMeta)
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if reply.Services == nil {
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return nil, CodedError(http.StatusNotFound, allocNotFoundErr)
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}
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return reply.Services, nil
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}
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func (s *HTTPServer) ClientAllocRequest(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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reqSuffix := strings.TrimPrefix(req.URL.Path, "/v1/client/allocation/")
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// tokenize the suffix of the path to get the alloc id and find the action
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// invoked on the alloc id
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tokens := strings.Split(reqSuffix, "/")
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if len(tokens) != 2 {
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return nil, CodedError(404, resourceNotFoundErr)
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}
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allocID := tokens[0]
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switch tokens[1] {
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case "checks":
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return s.allocChecks(allocID, resp, req)
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case "stats":
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return s.allocStats(allocID, resp, req)
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case "exec":
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return s.allocExec(allocID, resp, req)
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case "snapshot":
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if s.agent.client == nil {
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return nil, clientNotRunning
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}
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return s.allocSnapshot(allocID, resp, req)
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case "restart":
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return s.allocRestart(allocID, resp, req)
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case "gc":
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return s.allocGC(allocID, resp, req)
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case "signal":
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return s.allocSignal(allocID, resp, req)
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}
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return nil, CodedError(404, resourceNotFoundErr)
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}
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func (s *HTTPServer) ClientGCRequest(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Get the requested Node ID
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requestedNode := req.URL.Query().Get("node_id")
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// Build the request and parse the ACL token
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args := structs.NodeSpecificRequest{
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NodeID: requestedNode,
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}
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s.parse(resp, req, &args.QueryOptions.Region, &args.QueryOptions)
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// Determine the handler to use
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useLocalClient, useClientRPC, useServerRPC := s.rpcHandlerForNode(requestedNode)
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// Make the RPC
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var reply structs.GenericResponse
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var rpcErr error
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if useLocalClient {
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rpcErr = s.agent.Client().ClientRPC("Allocations.GarbageCollectAll", &args, &reply)
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} else if useClientRPC {
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rpcErr = s.agent.Client().RPC("ClientAllocations.GarbageCollectAll", &args, &reply)
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} else if useServerRPC {
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rpcErr = s.agent.Server().RPC("ClientAllocations.GarbageCollectAll", &args, &reply)
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} else {
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rpcErr = CodedError(400, "No local Node and node_id not provided")
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}
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if rpcErr != nil {
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if structs.IsErrNoNodeConn(rpcErr) {
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rpcErr = CodedError(404, rpcErr.Error())
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}
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}
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return nil, rpcErr
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}
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func (s *HTTPServer) allocRestart(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Build the request and parse the ACL token
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args := structs.AllocRestartRequest{
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AllocID: allocID,
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TaskName: "",
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}
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s.parse(resp, req, &args.QueryOptions.Region, &args.QueryOptions)
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// Explicitly parse the body separately to disallow overriding AllocID in req Body.
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var reqBody struct {
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TaskName string
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}
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err := json.NewDecoder(req.Body).Decode(&reqBody)
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if err != nil && err != io.EOF {
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return nil, err
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}
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if reqBody.TaskName != "" {
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args.TaskName = reqBody.TaskName
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}
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// Determine the handler to use
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useLocalClient, useClientRPC, useServerRPC := s.rpcHandlerForAlloc(allocID)
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// Make the RPC
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var reply structs.GenericResponse
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var rpcErr error
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if useLocalClient {
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rpcErr = s.agent.Client().ClientRPC("Allocations.Restart", &args, &reply)
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} else if useClientRPC {
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rpcErr = s.agent.Client().RPC("ClientAllocations.Restart", &args, &reply)
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} else if useServerRPC {
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rpcErr = s.agent.Server().RPC("ClientAllocations.Restart", &args, &reply)
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} else {
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rpcErr = CodedError(400, "No local Node and node_id not provided")
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}
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if rpcErr != nil {
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if structs.IsErrNoNodeConn(rpcErr) || structs.IsErrUnknownAllocation(rpcErr) {
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rpcErr = CodedError(404, rpcErr.Error())
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}
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}
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return reply, rpcErr
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}
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func (s *HTTPServer) allocGC(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Build the request and parse the ACL token
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args := structs.AllocSpecificRequest{
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AllocID: allocID,
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}
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s.parse(resp, req, &args.QueryOptions.Region, &args.QueryOptions)
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// Determine the handler to use
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useLocalClient, useClientRPC, useServerRPC := s.rpcHandlerForAlloc(allocID)
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// Make the RPC
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var reply structs.GenericResponse
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var rpcErr error
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if useLocalClient {
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rpcErr = s.agent.Client().ClientRPC("Allocations.GarbageCollect", &args, &reply)
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} else if useClientRPC {
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rpcErr = s.agent.Client().RPC("ClientAllocations.GarbageCollect", &args, &reply)
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} else if useServerRPC {
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rpcErr = s.agent.Server().RPC("ClientAllocations.GarbageCollect", &args, &reply)
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} else {
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rpcErr = CodedError(400, "No local Node and node_id not provided")
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}
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if rpcErr != nil {
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if structs.IsErrNoNodeConn(rpcErr) || structs.IsErrUnknownAllocation(rpcErr) {
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rpcErr = CodedError(404, rpcErr.Error())
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}
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}
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return nil, rpcErr
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}
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func (s *HTTPServer) allocSignal(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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if !(req.Method == "POST" || req.Method == "PUT") {
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return nil, CodedError(405, ErrInvalidMethod)
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}
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// Build the request and parse the ACL token
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args := structs.AllocSignalRequest{}
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err := decodeBody(req, &args)
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if err != nil {
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return nil, CodedError(400, fmt.Sprintf("Failed to decode body: %v", err))
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}
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s.parse(resp, req, &args.QueryOptions.Region, &args.QueryOptions)
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args.AllocID = allocID
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// Determine the handler to use
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useLocalClient, useClientRPC, useServerRPC := s.rpcHandlerForAlloc(allocID)
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// Make the RPC
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var reply structs.GenericResponse
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var rpcErr error
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if useLocalClient {
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rpcErr = s.agent.Client().ClientRPC("Allocations.Signal", &args, &reply)
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} else if useClientRPC {
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rpcErr = s.agent.Client().RPC("ClientAllocations.Signal", &args, &reply)
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} else if useServerRPC {
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rpcErr = s.agent.Server().RPC("ClientAllocations.Signal", &args, &reply)
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} else {
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rpcErr = CodedError(400, "No local Node and node_id not provided")
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}
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if rpcErr != nil {
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if structs.IsErrNoNodeConn(rpcErr) || structs.IsErrUnknownAllocation(rpcErr) {
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rpcErr = CodedError(404, rpcErr.Error())
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}
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}
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return reply, rpcErr
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}
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func (s *HTTPServer) allocSnapshot(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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var secret string
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s.parseToken(req, &secret)
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if !s.agent.Client().ValidateMigrateToken(allocID, secret) {
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return nil, structs.ErrPermissionDenied
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}
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allocFS, err := s.agent.Client().GetAllocFS(allocID)
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if err != nil {
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return nil, fmt.Errorf(allocNotFoundErr)
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}
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if err := allocFS.Snapshot(resp); err != nil {
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return nil, fmt.Errorf("error making snapshot: %v", err)
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}
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return nil, nil
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}
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func (s *HTTPServer) allocStats(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Build the request and parse the ACL token
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task := req.URL.Query().Get("task")
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args := cstructs.AllocStatsRequest{
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AllocID: allocID,
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Task: task,
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}
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s.parse(resp, req, &args.QueryOptions.Region, &args.QueryOptions)
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// Determine the handler to use
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useLocalClient, useClientRPC, useServerRPC := s.rpcHandlerForAlloc(allocID)
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// Make the RPC
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var reply cstructs.AllocStatsResponse
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var rpcErr error
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if useLocalClient {
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rpcErr = s.agent.Client().ClientRPC("Allocations.Stats", &args, &reply)
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} else if useClientRPC {
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rpcErr = s.agent.Client().RPC("ClientAllocations.Stats", &args, &reply)
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} else if useServerRPC {
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rpcErr = s.agent.Server().RPC("ClientAllocations.Stats", &args, &reply)
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} else {
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rpcErr = CodedError(400, "No local Node and node_id not provided")
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}
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if rpcErr != nil {
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if structs.IsErrNoNodeConn(rpcErr) || structs.IsErrUnknownAllocation(rpcErr) {
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rpcErr = CodedError(404, rpcErr.Error())
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}
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}
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return reply.Stats, rpcErr
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}
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func (s *HTTPServer) allocChecks(allocID string, resp http.ResponseWriter, req *http.Request) (any, error) {
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// Build the request and parse the ACL token
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args := cstructs.AllocChecksRequest{
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AllocID: allocID,
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}
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s.parse(resp, req, &args.QueryOptions.Region, &args.QueryOptions)
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// Determine the handler to use
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useLocalClient, useClientRPC, useServerRPC := s.rpcHandlerForAlloc(allocID)
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// Make the RPC
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var reply cstructs.AllocChecksResponse
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var rpcErr error
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switch {
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case useLocalClient:
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rpcErr = s.agent.Client().ClientRPC("Allocations.Checks", &args, &reply)
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case useClientRPC:
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rpcErr = s.agent.Client().RPC("Allocations.Checks", &args, &reply)
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case useServerRPC:
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rpcErr = s.agent.Server().RPC("Allocations.Checks", &args, &reply)
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default:
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rpcErr = CodedError(400, "No local Node and node_id not provided")
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}
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if rpcErr != nil {
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if structs.IsErrNoNodeConn(rpcErr) || structs.IsErrUnknownAllocation(rpcErr) {
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rpcErr = CodedError(404, rpcErr.Error())
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}
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}
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return reply.Results, rpcErr
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}
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func (s *HTTPServer) allocExec(allocID string, resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Build the request and parse the ACL token
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task := req.URL.Query().Get("task")
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cmdJsonStr := req.URL.Query().Get("command")
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var command []string
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err := json.Unmarshal([]byte(cmdJsonStr), &command)
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if err != nil {
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// this shouldn't happen, []string is always be serializable to json
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return nil, fmt.Errorf("failed to marshal command into json: %v", err)
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}
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ttyB := false
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if tty := req.URL.Query().Get("tty"); tty != "" {
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ttyB, err = strconv.ParseBool(tty)
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if err != nil {
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return nil, fmt.Errorf("tty value is not a boolean: %v", err)
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}
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}
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args := cstructs.AllocExecRequest{
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AllocID: allocID,
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Task: task,
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Cmd: command,
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Tty: ttyB,
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}
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s.parse(resp, req, &args.QueryOptions.Region, &args.QueryOptions)
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conn, err := s.wsUpgrader.Upgrade(resp, req, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to upgrade connection: %v", err)
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}
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if err := readWsHandshake(conn.ReadJSON, req, &args.QueryOptions); err != nil {
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||
conn.WriteMessage(websocket.CloseMessage,
|
||
websocket.FormatCloseMessage(toWsCode(400), err.Error()))
|
||
return nil, err
|
||
}
|
||
|
||
return s.execStreamImpl(conn, &args)
|
||
}
|
||
|
||
// readWsHandshake reads the websocket handshake message and sets
|
||
// query authentication token, if request requires a handshake
|
||
func readWsHandshake(readFn func(interface{}) error, req *http.Request, q *structs.QueryOptions) error {
|
||
|
||
// Avoid handshake if request doesn't require one
|
||
if hv := req.URL.Query().Get("ws_handshake"); hv == "" {
|
||
return nil
|
||
} else if h, err := strconv.ParseBool(hv); err != nil {
|
||
return fmt.Errorf("ws_handshake value is not a boolean: %v", err)
|
||
} else if !h {
|
||
return nil
|
||
}
|
||
|
||
var h wsHandshakeMessage
|
||
err := readFn(&h)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
supportedWSHandshakeVersion := 1
|
||
if h.Version != supportedWSHandshakeVersion {
|
||
return fmt.Errorf("unexpected handshake value: %v", h.Version)
|
||
}
|
||
|
||
q.AuthToken = h.AuthToken
|
||
return nil
|
||
}
|
||
|
||
type wsHandshakeMessage struct {
|
||
Version int `json:"version"`
|
||
AuthToken string `json:"auth_token"`
|
||
}
|
||
|
||
func (s *HTTPServer) execStreamImpl(ws *websocket.Conn, args *cstructs.AllocExecRequest) (interface{}, error) {
|
||
allocID := args.AllocID
|
||
method := "Allocations.Exec"
|
||
|
||
// Get the correct handler
|
||
localClient, remoteClient, localServer := s.rpcHandlerForAlloc(allocID)
|
||
var handler structs.StreamingRpcHandler
|
||
var handlerErr error
|
||
if localClient {
|
||
handler, handlerErr = s.agent.Client().StreamingRpcHandler(method)
|
||
} else if remoteClient {
|
||
handler, handlerErr = s.agent.Client().RemoteStreamingRpcHandler(method)
|
||
} else if localServer {
|
||
handler, handlerErr = s.agent.Server().StreamingRpcHandler(method)
|
||
}
|
||
|
||
if handlerErr != nil {
|
||
return nil, CodedError(500, handlerErr.Error())
|
||
}
|
||
|
||
// Create a pipe connecting the (possibly remote) handler to the http response
|
||
httpPipe, handlerPipe := net.Pipe()
|
||
decoder := codec.NewDecoder(httpPipe, structs.MsgpackHandle)
|
||
encoder := codec.NewEncoder(httpPipe, structs.MsgpackHandle)
|
||
|
||
// Create a goroutine that closes the pipe if the connection closes.
|
||
ctx, cancel := context.WithCancel(context.Background())
|
||
go func() {
|
||
<-ctx.Done()
|
||
httpPipe.Close()
|
||
|
||
// don't close ws - wait to drain messages
|
||
}()
|
||
|
||
// Create a channel that decodes the results
|
||
errCh := make(chan HTTPCodedError, 2)
|
||
|
||
// stream response
|
||
go func() {
|
||
defer cancel()
|
||
|
||
// Send the request
|
||
if err := encoder.Encode(args); err != nil {
|
||
errCh <- CodedError(500, err.Error())
|
||
return
|
||
}
|
||
|
||
go forwardExecInput(encoder, ws, errCh)
|
||
|
||
for {
|
||
var res cstructs.StreamErrWrapper
|
||
err := decoder.Decode(&res)
|
||
if isClosedError(err) {
|
||
ws.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
|
||
errCh <- nil
|
||
return
|
||
}
|
||
|
||
if err != nil {
|
||
errCh <- CodedError(500, err.Error())
|
||
return
|
||
}
|
||
decoder.Reset(httpPipe)
|
||
|
||
if err := res.Error; err != nil {
|
||
code := 500
|
||
if err.Code != nil {
|
||
code = int(*err.Code)
|
||
}
|
||
errCh <- CodedError(code, err.Error())
|
||
return
|
||
}
|
||
|
||
if err := ws.WriteMessage(websocket.TextMessage, res.Payload); err != nil {
|
||
errCh <- CodedError(500, err.Error())
|
||
return
|
||
}
|
||
}
|
||
}()
|
||
|
||
// start streaming request to streaming RPC - returns when streaming completes or errors
|
||
handler(handlerPipe)
|
||
// stop streaming background goroutines for streaming - but not websocket activity
|
||
cancel()
|
||
// retrieve any error and/or wait until goroutine stop and close errCh connection before
|
||
// closing websocket connection
|
||
codedErr := <-errCh
|
||
|
||
// we won't return an error on ws close, but at least make it available in
|
||
// the logs so we can trace spurious disconnects
|
||
if codedErr != nil {
|
||
s.logger.Debug("alloc exec channel closed with error", "error", codedErr)
|
||
}
|
||
|
||
if isClosedError(codedErr) {
|
||
codedErr = nil
|
||
} else if codedErr != nil {
|
||
ws.WriteMessage(websocket.CloseMessage,
|
||
websocket.FormatCloseMessage(toWsCode(codedErr.Code()), codedErr.Error()))
|
||
}
|
||
ws.Close()
|
||
|
||
return nil, codedErr
|
||
}
|
||
|
||
func toWsCode(httpCode int) int {
|
||
switch httpCode {
|
||
case 500:
|
||
return websocket.CloseInternalServerErr
|
||
default:
|
||
// placeholder error code
|
||
return websocket.ClosePolicyViolation
|
||
}
|
||
}
|
||
|
||
func isClosedError(err error) bool {
|
||
if err == nil {
|
||
return false
|
||
}
|
||
|
||
return err == io.EOF ||
|
||
err == io.ErrClosedPipe ||
|
||
strings.Contains(err.Error(), "closed") ||
|
||
strings.Contains(err.Error(), "EOF")
|
||
}
|
||
|
||
// forwardExecInput forwards exec input (e.g. stdin) from websocket connection
|
||
// to the streaming RPC connection to client
|
||
func forwardExecInput(encoder *codec.Encoder, ws *websocket.Conn, errCh chan<- HTTPCodedError) {
|
||
for {
|
||
sf := &drivers.ExecTaskStreamingRequestMsg{}
|
||
err := ws.ReadJSON(sf)
|
||
if err == io.EOF {
|
||
return
|
||
}
|
||
|
||
if err != nil {
|
||
errCh <- CodedError(500, err.Error())
|
||
return
|
||
}
|
||
|
||
err = encoder.Encode(sf)
|
||
if err != nil {
|
||
errCh <- CodedError(500, err.Error())
|
||
}
|
||
}
|
||
}
|