559 lines
15 KiB
Go
559 lines
15 KiB
Go
package nomad
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import (
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"fmt"
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"net/http"
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"time"
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metrics "github.com/armon/go-metrics"
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log "github.com/hashicorp/go-hclog"
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memdb "github.com/hashicorp/go-memdb"
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multierror "github.com/hashicorp/go-multierror"
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"github.com/hashicorp/nomad/acl"
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"github.com/hashicorp/nomad/nomad/state"
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"github.com/hashicorp/nomad/nomad/state/paginator"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/hashicorp/nomad/scheduler"
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)
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const (
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// DefaultDequeueTimeout is used if no dequeue timeout is provided
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DefaultDequeueTimeout = time.Second
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)
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// Eval endpoint is used for eval interactions
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type Eval struct {
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srv *Server
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logger log.Logger
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// ctx provides context regarding the underlying connection
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ctx *RPCContext
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}
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// GetEval is used to request information about a specific evaluation
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func (e *Eval) GetEval(args *structs.EvalSpecificRequest,
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reply *structs.SingleEvalResponse) error {
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if done, err := e.srv.forward("Eval.GetEval", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "get_eval"}, time.Now())
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// Check for read-job permissions before performing blocking query.
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allowNsOp := acl.NamespaceValidator(acl.NamespaceCapabilityReadJob)
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aclObj, err := e.srv.ResolveToken(args.AuthToken)
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if err != nil {
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return err
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} else if !allowNsOp(aclObj, args.RequestNamespace()) {
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return structs.ErrPermissionDenied
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}
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// Setup the blocking query
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opts := blockingOptions{
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queryOpts: &args.QueryOptions,
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queryMeta: &reply.QueryMeta,
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run: func(ws memdb.WatchSet, state *state.StateStore) error {
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var related []*structs.EvaluationStub
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// Look for the eval
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eval, err := state.EvalByID(ws, args.EvalID)
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if err != nil {
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return fmt.Errorf("failed to lookup eval: %v", err)
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}
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if eval != nil {
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// Re-check namespace in case it differs from request.
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if !allowNsOp(aclObj, eval.Namespace) {
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return structs.ErrPermissionDenied
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}
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// Lookup related evals if requested.
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if args.IncludeRelated {
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related, err = state.EvalsRelatedToID(ws, eval.ID)
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if err != nil {
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return fmt.Errorf("failed to lookup related evals: %v", err)
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}
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// Use a copy to avoid modifying the original eval.
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eval = eval.Copy()
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eval.RelatedEvals = related
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}
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}
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// Setup the output.
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reply.Eval = eval
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if eval != nil {
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reply.Index = eval.ModifyIndex
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} else {
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// Use the last index that affected the evals table
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index, err := state.Index("evals")
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if err != nil {
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return err
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}
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reply.Index = index
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}
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// Set the query response
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e.srv.setQueryMeta(&reply.QueryMeta)
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return nil
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}}
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return e.srv.blockingRPC(&opts)
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}
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// Dequeue is used to dequeue a pending evaluation
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func (e *Eval) Dequeue(args *structs.EvalDequeueRequest,
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reply *structs.EvalDequeueResponse) error {
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// Ensure the connection was initiated by another server if TLS is used.
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err := validateTLSCertificateLevel(e.srv, e.ctx, tlsCertificateLevelServer)
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if err != nil {
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return err
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}
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if done, err := e.srv.forward("Eval.Dequeue", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "dequeue"}, time.Now())
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// Ensure there is at least one scheduler
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if len(args.Schedulers) == 0 {
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return fmt.Errorf("dequeue requires at least one scheduler type")
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}
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// Check that there isn't a scheduler version mismatch
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if args.SchedulerVersion != scheduler.SchedulerVersion {
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return fmt.Errorf("dequeue disallowed: calling scheduler version is %d; leader version is %d",
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args.SchedulerVersion, scheduler.SchedulerVersion)
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}
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// Ensure there is a default timeout
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if args.Timeout <= 0 {
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args.Timeout = DefaultDequeueTimeout
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}
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// Attempt the dequeue
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eval, token, err := e.srv.evalBroker.Dequeue(args.Schedulers, args.Timeout)
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if err != nil {
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return err
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}
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// Provide the output if any
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if eval != nil {
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// Get the index that the worker should wait until before scheduling.
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waitIndex, err := e.getWaitIndex(eval.Namespace, eval.JobID, eval.ModifyIndex)
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if err != nil {
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var mErr multierror.Error
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_ = multierror.Append(&mErr, err)
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// We have dequeued the evaluation but won't be returning it to the
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// worker so Nack the eval.
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if err := e.srv.evalBroker.Nack(eval.ID, token); err != nil {
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_ = multierror.Append(&mErr, err)
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}
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return &mErr
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}
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reply.Eval = eval
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reply.Token = token
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reply.WaitIndex = waitIndex
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}
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// Set the query response
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e.srv.setQueryMeta(&reply.QueryMeta)
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return nil
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}
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// getWaitIndex returns the wait index that should be used by the worker before
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// invoking the scheduler. The index should be the highest modify index of any
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// evaluation for the job. This prevents scheduling races for the same job when
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// there are blocked evaluations.
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func (e *Eval) getWaitIndex(namespace, job string, evalModifyIndex uint64) (uint64, error) {
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snap, err := e.srv.State().Snapshot()
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if err != nil {
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return 0, err
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}
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evals, err := snap.EvalsByJob(nil, namespace, job)
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if err != nil {
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return 0, err
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}
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// Since dequeueing evals is concurrent with applying Raft messages to
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// the state store, initialize to the currently dequeued eval's index
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// in case it isn't in the snapshot used by EvalsByJob yet.
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max := evalModifyIndex
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for _, eval := range evals {
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if max < eval.ModifyIndex {
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max = eval.ModifyIndex
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}
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}
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return max, nil
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}
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// Ack is used to acknowledge completion of a dequeued evaluation
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func (e *Eval) Ack(args *structs.EvalAckRequest,
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reply *structs.GenericResponse) error {
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// Ensure the connection was initiated by another server if TLS is used.
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err := validateTLSCertificateLevel(e.srv, e.ctx, tlsCertificateLevelServer)
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if err != nil {
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return err
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}
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if done, err := e.srv.forward("Eval.Ack", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "ack"}, time.Now())
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// Ack the EvalID
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if err := e.srv.evalBroker.Ack(args.EvalID, args.Token); err != nil {
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return err
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}
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return nil
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}
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// Nack is used to negative acknowledge completion of a dequeued evaluation.
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func (e *Eval) Nack(args *structs.EvalAckRequest,
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reply *structs.GenericResponse) error {
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// Ensure the connection was initiated by another server if TLS is used.
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err := validateTLSCertificateLevel(e.srv, e.ctx, tlsCertificateLevelServer)
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if err != nil {
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return err
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}
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if done, err := e.srv.forward("Eval.Nack", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "nack"}, time.Now())
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// Nack the EvalID
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if err := e.srv.evalBroker.Nack(args.EvalID, args.Token); err != nil {
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return err
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}
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return nil
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}
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// Update is used to perform an update of an Eval if it is outstanding.
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func (e *Eval) Update(args *structs.EvalUpdateRequest,
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reply *structs.GenericResponse) error {
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// Ensure the connection was initiated by another server if TLS is used.
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err := validateTLSCertificateLevel(e.srv, e.ctx, tlsCertificateLevelServer)
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if err != nil {
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return err
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}
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if done, err := e.srv.forward("Eval.Update", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "update"}, time.Now())
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// Ensure there is only a single update with token
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if len(args.Evals) != 1 {
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return fmt.Errorf("only a single eval can be updated")
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}
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eval := args.Evals[0]
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// Verify the evaluation is outstanding, and that the tokens match.
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if err := e.srv.evalBroker.OutstandingReset(eval.ID, args.EvalToken); err != nil {
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return err
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}
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// Update via Raft
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_, index, err := e.srv.raftApply(structs.EvalUpdateRequestType, args)
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if err != nil {
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return err
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}
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// Update the index
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reply.Index = index
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return nil
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}
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// Create is used to make a new evaluation
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func (e *Eval) Create(args *structs.EvalUpdateRequest,
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reply *structs.GenericResponse) error {
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// Ensure the connection was initiated by another server if TLS is used.
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err := validateTLSCertificateLevel(e.srv, e.ctx, tlsCertificateLevelServer)
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if err != nil {
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return err
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}
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if done, err := e.srv.forward("Eval.Create", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "create"}, time.Now())
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// Ensure there is only a single update with token
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if len(args.Evals) != 1 {
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return fmt.Errorf("only a single eval can be created")
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}
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eval := args.Evals[0]
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// Verify the parent evaluation is outstanding, and that the tokens match.
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if err := e.srv.evalBroker.OutstandingReset(eval.PreviousEval, args.EvalToken); err != nil {
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return err
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}
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// Look for the eval
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snap, err := e.srv.fsm.State().Snapshot()
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if err != nil {
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return err
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}
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ws := memdb.NewWatchSet()
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out, err := snap.EvalByID(ws, eval.ID)
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if err != nil {
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return err
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}
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if out != nil {
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return fmt.Errorf("evaluation already exists")
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}
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// Update via Raft
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_, index, err := e.srv.raftApply(structs.EvalUpdateRequestType, args)
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if err != nil {
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return err
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}
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// Update the index
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reply.Index = index
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return nil
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}
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// Reblock is used to reinsert an existing blocked evaluation into the blocked
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// evaluation tracker.
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func (e *Eval) Reblock(args *structs.EvalUpdateRequest, reply *structs.GenericResponse) error {
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// Ensure the connection was initiated by another server if TLS is used.
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err := validateTLSCertificateLevel(e.srv, e.ctx, tlsCertificateLevelServer)
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if err != nil {
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return err
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}
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if done, err := e.srv.forward("Eval.Reblock", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "reblock"}, time.Now())
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// Ensure there is only a single update with token
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if len(args.Evals) != 1 {
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return fmt.Errorf("only a single eval can be reblocked")
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}
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eval := args.Evals[0]
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// Verify the evaluation is outstanding, and that the tokens match.
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if err := e.srv.evalBroker.OutstandingReset(eval.ID, args.EvalToken); err != nil {
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return err
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}
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// Look for the eval
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snap, err := e.srv.fsm.State().Snapshot()
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if err != nil {
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return err
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}
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ws := memdb.NewWatchSet()
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out, err := snap.EvalByID(ws, eval.ID)
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if err != nil {
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return err
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}
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if out == nil {
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return fmt.Errorf("evaluation does not exist")
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}
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if out.Status != structs.EvalStatusBlocked {
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return fmt.Errorf("evaluation not blocked")
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}
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// Reblock the eval
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e.srv.blockedEvals.Reblock(eval, args.EvalToken)
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return nil
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}
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// Reap is used to cleanup dead evaluations and allocations
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func (e *Eval) Reap(args *structs.EvalDeleteRequest,
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reply *structs.GenericResponse) error {
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// Ensure the connection was initiated by another server if TLS is used.
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err := validateTLSCertificateLevel(e.srv, e.ctx, tlsCertificateLevelServer)
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if err != nil {
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return err
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}
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if done, err := e.srv.forward("Eval.Reap", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "reap"}, time.Now())
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// Update via Raft
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_, index, err := e.srv.raftApply(structs.EvalDeleteRequestType, args)
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if err != nil {
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return err
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}
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// Update the index
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reply.Index = index
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return nil
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}
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// List is used to get a list of the evaluations in the system
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func (e *Eval) List(args *structs.EvalListRequest, reply *structs.EvalListResponse) error {
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if done, err := e.srv.forward("Eval.List", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "list"}, time.Now())
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namespace := args.RequestNamespace()
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// Check for read-job permissions
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if aclObj, err := e.srv.ResolveToken(args.AuthToken); err != nil {
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return err
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} else if aclObj != nil && !aclObj.AllowNsOp(namespace, acl.NamespaceCapabilityReadJob) {
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return structs.ErrPermissionDenied
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}
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if args.Filter != "" {
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// Check for incompatible filtering.
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hasLegacyFilter := args.FilterJobID != "" || args.FilterEvalStatus != ""
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if hasLegacyFilter {
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return structs.ErrIncompatibleFiltering
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}
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}
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// Setup the blocking query
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sort := state.SortOption(args.Reverse)
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opts := blockingOptions{
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queryOpts: &args.QueryOptions,
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queryMeta: &reply.QueryMeta,
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run: func(ws memdb.WatchSet, store *state.StateStore) error {
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// Scan all the evaluations
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var err error
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var iter memdb.ResultIterator
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var opts paginator.StructsTokenizerOptions
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if prefix := args.QueryOptions.Prefix; prefix != "" {
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iter, err = store.EvalsByIDPrefix(ws, namespace, prefix, sort)
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opts = paginator.StructsTokenizerOptions{
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WithID: true,
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}
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} else if namespace != structs.AllNamespacesSentinel {
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iter, err = store.EvalsByNamespaceOrdered(ws, namespace, sort)
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opts = paginator.StructsTokenizerOptions{
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WithCreateIndex: true,
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WithID: true,
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}
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} else {
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iter, err = store.Evals(ws, sort)
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opts = paginator.StructsTokenizerOptions{
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WithCreateIndex: true,
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WithID: true,
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}
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}
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if err != nil {
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return err
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}
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iter = memdb.NewFilterIterator(iter, func(raw interface{}) bool {
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if eval := raw.(*structs.Evaluation); eval != nil {
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return args.ShouldBeFiltered(eval)
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}
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return false
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})
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tokenizer := paginator.NewStructsTokenizer(iter, opts)
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var evals []*structs.Evaluation
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paginator, err := paginator.NewPaginator(iter, tokenizer, nil, args.QueryOptions,
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func(raw interface{}) error {
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eval := raw.(*structs.Evaluation)
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evals = append(evals, eval)
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return nil
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})
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if err != nil {
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return structs.NewErrRPCCodedf(
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http.StatusBadRequest, "failed to create result paginator: %v", err)
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}
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nextToken, err := paginator.Page()
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if err != nil {
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return structs.NewErrRPCCodedf(
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http.StatusBadRequest, "failed to read result page: %v", err)
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}
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reply.QueryMeta.NextToken = nextToken
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reply.Evaluations = evals
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// Use the last index that affected the jobs table
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index, err := store.Index("evals")
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if err != nil {
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return err
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}
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reply.Index = index
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// Set the query response
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e.srv.setQueryMeta(&reply.QueryMeta)
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return nil
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}}
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return e.srv.blockingRPC(&opts)
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}
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// Allocations is used to list the allocations for an evaluation
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func (e *Eval) Allocations(args *structs.EvalSpecificRequest,
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reply *structs.EvalAllocationsResponse) error {
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if done, err := e.srv.forward("Eval.Allocations", args, args, reply); done {
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return err
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}
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defer metrics.MeasureSince([]string{"nomad", "eval", "allocations"}, time.Now())
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// Check for read-job permissions
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allowNsOp := acl.NamespaceValidator(acl.NamespaceCapabilityReadJob)
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aclObj, err := e.srv.ResolveToken(args.AuthToken)
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if err != nil {
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return err
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} else if !allowNsOp(aclObj, args.RequestNamespace()) {
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return structs.ErrPermissionDenied
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}
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|
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// Setup the blocking query
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opts := blockingOptions{
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queryOpts: &args.QueryOptions,
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queryMeta: &reply.QueryMeta,
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run: func(ws memdb.WatchSet, state *state.StateStore) error {
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// Capture the allocations
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allocs, err := state.AllocsByEval(ws, args.EvalID)
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if err != nil {
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return err
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}
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// Convert to a stub
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if len(allocs) > 0 {
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// Evaluations do not span namespaces so just check the
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// first allocs namespace.
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ns := allocs[0].Namespace
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if ns != args.RequestNamespace() && !allowNsOp(aclObj, ns) {
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return structs.ErrPermissionDenied
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|
}
|
|
|
|
reply.Allocations = make([]*structs.AllocListStub, 0, len(allocs))
|
|
for _, alloc := range allocs {
|
|
reply.Allocations = append(reply.Allocations, alloc.Stub(nil))
|
|
}
|
|
}
|
|
|
|
// Use the last index that affected the allocs table
|
|
index, err := state.Index("allocs")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
reply.Index = index
|
|
|
|
// Set the query response
|
|
e.srv.setQueryMeta(&reply.QueryMeta)
|
|
return nil
|
|
}}
|
|
return e.srv.blockingRPC(&opts)
|
|
}
|