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client_alloc_endpoint.go
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/
client_alloc_endpoint.go
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package nomad
import (
"errors"
"fmt"
"io"
"net"
"time"
metrics "github.com/armon/go-metrics"
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-msgpack/codec"
cstructs "github.com/hashicorp/nomad/client/structs"
"github.com/hashicorp/nomad/helper"
"github.com/hashicorp/nomad/acl"
"github.com/hashicorp/nomad/nomad/structs"
)
// ClientAllocations is used to forward RPC requests to the targed Nomad client's
// Allocation endpoint.
type ClientAllocations struct {
srv *Server
logger log.Logger
}
func (a *ClientAllocations) register() {
a.srv.streamingRpcs.Register("Allocations.Exec", a.exec)
}
// GarbageCollectAll is used to garbage collect all allocations on a client.
func (a *ClientAllocations) GarbageCollectAll(args *structs.NodeSpecificRequest, reply *structs.GenericResponse) error {
// We only allow stale reads since the only potentially stale information is
// the Node registration and the cost is fairly high for adding another hop
// in the forwarding chain.
args.QueryOptions.AllowStale = true
// Potentially forward to a different region.
if done, err := a.srv.forward("ClientAllocations.GarbageCollectAll", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"nomad", "client_allocations", "garbage_collect_all"}, time.Now())
// Check node read permissions
if aclObj, err := a.srv.ResolveToken(args.AuthToken); err != nil {
return err
} else if aclObj != nil && !aclObj.AllowNodeWrite() {
return structs.ErrPermissionDenied
}
// Verify the arguments.
if args.NodeID == "" {
return errors.New("missing NodeID")
}
// Make sure Node is valid and new enough to support RPC
snap, err := a.srv.State().Snapshot()
if err != nil {
return err
}
_, err = getNodeForRpc(snap, args.NodeID)
if err != nil {
return err
}
// Get the connection to the client
state, ok := a.srv.getNodeConn(args.NodeID)
if !ok {
return findNodeConnAndForward(a.srv, args.NodeID, "ClientAllocations.GarbageCollectAll", args, reply)
}
// Make the RPC
return NodeRpc(state.Session, "Allocations.GarbageCollectAll", args, reply)
}
// Signal is used to send a signal to an allocation on a client.
func (a *ClientAllocations) Signal(args *structs.AllocSignalRequest, reply *structs.GenericResponse) error {
// We only allow stale reads since the only potentially stale information is
// the Node registration and the cost is fairly high for adding another hope
// in the forwarding chain.
args.QueryOptions.AllowStale = true
// Potentially forward to a different region.
if done, err := a.srv.forward("ClientAllocations.Signal", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"nomad", "client_allocations", "signal"}, time.Now())
// Verify the arguments.
if args.AllocID == "" {
return errors.New("missing AllocID")
}
// Find the allocation
snap, err := a.srv.State().Snapshot()
if err != nil {
return err
}
alloc, err := getAlloc(snap, args.AllocID)
if err != nil {
return err
}
// Check namespace alloc-lifecycle permission.
if aclObj, err := a.srv.ResolveToken(args.AuthToken); err != nil {
return err
} else if aclObj != nil && !aclObj.AllowNsOp(alloc.Namespace, acl.NamespaceCapabilityAllocLifecycle) {
return structs.ErrPermissionDenied
}
// Make sure Node is valid and new enough to support RPC
_, err = getNodeForRpc(snap, alloc.NodeID)
if err != nil {
return err
}
// Get the connection to the client
state, ok := a.srv.getNodeConn(alloc.NodeID)
if !ok {
return findNodeConnAndForward(a.srv, alloc.NodeID, "ClientAllocations.Signal", args, reply)
}
// Make the RPC
return NodeRpc(state.Session, "Allocations.Signal", args, reply)
}
// GarbageCollect is used to garbage collect an allocation on a client.
func (a *ClientAllocations) GarbageCollect(args *structs.AllocSpecificRequest, reply *structs.GenericResponse) error {
// We only allow stale reads since the only potentially stale information is
// the Node registration and the cost is fairly high for adding another hop
// in the forwarding chain.
args.QueryOptions.AllowStale = true
// Potentially forward to a different region.
if done, err := a.srv.forward("ClientAllocations.GarbageCollect", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"nomad", "client_allocations", "garbage_collect"}, time.Now())
// Verify the arguments.
if args.AllocID == "" {
return errors.New("missing AllocID")
}
// Find the allocation
snap, err := a.srv.State().Snapshot()
if err != nil {
return err
}
alloc, err := getAlloc(snap, args.AllocID)
if err != nil {
return err
}
// Check namespace submit-job permission.
if aclObj, err := a.srv.ResolveToken(args.AuthToken); err != nil {
return err
} else if aclObj != nil && !aclObj.AllowNsOp(alloc.Namespace, acl.NamespaceCapabilitySubmitJob) {
return structs.ErrPermissionDenied
}
// Make sure Node is valid and new enough to support RPC
_, err = getNodeForRpc(snap, alloc.NodeID)
if err != nil {
return err
}
// Get the connection to the client
state, ok := a.srv.getNodeConn(alloc.NodeID)
if !ok {
return findNodeConnAndForward(a.srv, alloc.NodeID, "ClientAllocations.GarbageCollect", args, reply)
}
// Make the RPC
return NodeRpc(state.Session, "Allocations.GarbageCollect", args, reply)
}
// Restart is used to trigger a restart of an allocation or a subtask on a client.
func (a *ClientAllocations) Restart(args *structs.AllocRestartRequest, reply *structs.GenericResponse) error {
// We only allow stale reads since the only potentially stale information is
// the Node registration and the cost is fairly high for adding another hop
// in the forwarding chain.
args.QueryOptions.AllowStale = true
// Potentially forward to a different region.
if done, err := a.srv.forward("ClientAllocations.Restart", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"nomad", "client_allocations", "restart"}, time.Now())
// Find the allocation
snap, err := a.srv.State().Snapshot()
if err != nil {
return err
}
alloc, err := getAlloc(snap, args.AllocID)
if err != nil {
return err
}
// Check for namespace alloc-lifecycle permissions.
if aclObj, err := a.srv.ResolveToken(args.AuthToken); err != nil {
return err
} else if aclObj != nil && !aclObj.AllowNsOp(alloc.Namespace, acl.NamespaceCapabilityAllocLifecycle) {
return structs.ErrPermissionDenied
}
// Make sure Node is valid and new enough to support RPC
_, err = getNodeForRpc(snap, alloc.NodeID)
if err != nil {
return err
}
// Get the connection to the client
state, ok := a.srv.getNodeConn(alloc.NodeID)
if !ok {
return findNodeConnAndForward(a.srv, alloc.NodeID, "ClientAllocations.Restart", args, reply)
}
// Make the RPC
return NodeRpc(state.Session, "Allocations.Restart", args, reply)
}
// Stats is used to collect allocation statistics
func (a *ClientAllocations) Stats(args *cstructs.AllocStatsRequest, reply *cstructs.AllocStatsResponse) error {
// We only allow stale reads since the only potentially stale information is
// the Node registration and the cost is fairly high for adding another hop
// in the forwarding chain.
args.QueryOptions.AllowStale = true
// Potentially forward to a different region.
if done, err := a.srv.forward("ClientAllocations.Stats", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"nomad", "client_allocations", "stats"}, time.Now())
// Find the allocation
snap, err := a.srv.State().Snapshot()
if err != nil {
return err
}
alloc, err := getAlloc(snap, args.AllocID)
if err != nil {
return err
}
// Check for namespace read-job permissions.
if aclObj, err := a.srv.ResolveToken(args.AuthToken); err != nil {
return err
} else if aclObj != nil && !aclObj.AllowNsOp(alloc.Namespace, acl.NamespaceCapabilityReadJob) {
return structs.ErrPermissionDenied
}
// Make sure Node is valid and new enough to support RPC
_, err = getNodeForRpc(snap, alloc.NodeID)
if err != nil {
return err
}
// Get the connection to the client
state, ok := a.srv.getNodeConn(alloc.NodeID)
if !ok {
return findNodeConnAndForward(a.srv, alloc.NodeID, "ClientAllocations.Stats", args, reply)
}
// Make the RPC
return NodeRpc(state.Session, "Allocations.Stats", args, reply)
}
// exec is used to execute command in a running task
func (a *ClientAllocations) exec(conn io.ReadWriteCloser) {
defer conn.Close()
defer metrics.MeasureSince([]string{"nomad", "alloc", "exec"}, time.Now())
// Decode the arguments
var args cstructs.AllocExecRequest
decoder := codec.NewDecoder(conn, structs.MsgpackHandle)
encoder := codec.NewEncoder(conn, structs.MsgpackHandle)
if err := decoder.Decode(&args); err != nil {
handleStreamResultError(err, helper.Int64ToPtr(500), encoder)
return
}
// Check if we need to forward to a different region
if r := args.RequestRegion(); r != a.srv.Region() {
forwardRegionStreamingRpc(a.srv, conn, encoder, &args, "Allocations.Exec",
args.AllocID, &args.QueryOptions)
return
}
// Verify the arguments.
if args.AllocID == "" {
handleStreamResultError(errors.New("missing AllocID"), helper.Int64ToPtr(400), encoder)
return
}
// Retrieve the allocation
snap, err := a.srv.State().Snapshot()
if err != nil {
handleStreamResultError(err, nil, encoder)
return
}
alloc, err := getAlloc(snap, args.AllocID)
if structs.IsErrUnknownAllocation(err) {
handleStreamResultError(err, helper.Int64ToPtr(404), encoder)
return
}
if err != nil {
handleStreamResultError(err, nil, encoder)
return
}
// Check node read permissions
if aclObj, err := a.srv.ResolveToken(args.AuthToken); err != nil {
handleStreamResultError(err, nil, encoder)
return
} else if aclObj != nil && !aclObj.AllowNsOp(alloc.Namespace, acl.NamespaceCapabilityAllocExec) {
// client ultimately checks if AllocNodeExec is required
handleStreamResultError(structs.ErrPermissionDenied, nil, encoder)
return
}
nodeID := alloc.NodeID
// Make sure Node is valid and new enough to support RPC
node, err := snap.NodeByID(nil, nodeID)
if err != nil {
handleStreamResultError(err, helper.Int64ToPtr(500), encoder)
return
}
if node == nil {
err := fmt.Errorf("Unknown node %q", nodeID)
handleStreamResultError(err, helper.Int64ToPtr(400), encoder)
return
}
if err := nodeSupportsRpc(node); err != nil {
handleStreamResultError(err, helper.Int64ToPtr(400), encoder)
return
}
// Get the connection to the client either by forwarding to another server
// or creating a direct stream
var clientConn net.Conn
state, ok := a.srv.getNodeConn(nodeID)
if !ok {
// Determine the Server that has a connection to the node.
srv, err := a.srv.serverWithNodeConn(nodeID, a.srv.Region())
if err != nil {
var code *int64
if structs.IsErrNoNodeConn(err) {
code = helper.Int64ToPtr(404)
}
handleStreamResultError(err, code, encoder)
return
}
// Get a connection to the server
conn, err := a.srv.streamingRpc(srv, "Allocations.Exec")
if err != nil {
handleStreamResultError(err, nil, encoder)
return
}
clientConn = conn
} else {
stream, err := NodeStreamingRpc(state.Session, "Allocations.Exec")
if err != nil {
handleStreamResultError(err, nil, encoder)
return
}
clientConn = stream
}
defer clientConn.Close()
// Send the request.
outEncoder := codec.NewEncoder(clientConn, structs.MsgpackHandle)
if err := outEncoder.Encode(args); err != nil {
handleStreamResultError(err, nil, encoder)
return
}
structs.Bridge(conn, clientConn)
return
}