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alloc_endpoint.go
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/
alloc_endpoint.go
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package nomad
import (
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/nomad/watch"
)
// Alloc endpoint is used for manipulating allocations
type Alloc struct {
srv *Server
}
// List is used to list the allocations in the system
func (a *Alloc) List(args *structs.AllocListRequest, reply *structs.AllocListResponse) error {
if done, err := a.srv.forward("Alloc.List", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"nomad", "alloc", "list"}, time.Now())
// Setup the blocking query
opts := blockingOptions{
queryOpts: &args.QueryOptions,
queryMeta: &reply.QueryMeta,
watch: watch.NewItems(watch.Item{Table: "allocs"}),
run: func() error {
// Capture all the allocations
snap, err := a.srv.fsm.State().Snapshot()
if err != nil {
return err
}
iter, err := snap.Allocs()
if err != nil {
return err
}
var allocs []*structs.AllocListStub
for {
raw := iter.Next()
if raw == nil {
break
}
alloc := raw.(*structs.Allocation)
allocs = append(allocs, alloc.Stub())
}
reply.Allocations = allocs
// Use the last index that affected the jobs table
index, err := snap.Index("allocs")
if err != nil {
return err
}
reply.Index = index
// Set the query response
a.srv.setQueryMeta(&reply.QueryMeta)
return nil
}}
return a.srv.blockingRPC(&opts)
}
// GetAlloc is used to lookup a particular allocation
func (a *Alloc) GetAlloc(args *structs.AllocSpecificRequest,
reply *structs.SingleAllocResponse) error {
if done, err := a.srv.forward("Alloc.GetAlloc", args, args, reply); done {
return err
}
defer metrics.MeasureSince([]string{"nomad", "alloc", "get_alloc"}, time.Now())
// Setup the blocking query
opts := blockingOptions{
queryOpts: &args.QueryOptions,
queryMeta: &reply.QueryMeta,
watch: watch.NewItems(watch.Item{Alloc: args.AllocID}),
run: func() error {
// Lookup the allocation
snap, err := a.srv.fsm.State().Snapshot()
if err != nil {
return err
}
out, err := snap.AllocByID(args.AllocID)
if err != nil {
return err
}
// Setup the output
reply.Alloc = out
if out != nil {
reply.Index = out.ModifyIndex
} else {
// Use the last index that affected the nodes table
index, err := snap.Index("allocs")
if err != nil {
return err
}
reply.Index = index
}
// Set the query response
a.srv.setQueryMeta(&reply.QueryMeta)
return nil
}}
return a.srv.blockingRPC(&opts)
}