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execute_task.go
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execute_task.go
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// Copyright 2014-2022 Aerospike, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package aerospike
import (
"context"
"math/rand"
"strconv"
"strings"
"time"
kvs "github.com/aerospike/aerospike-client-go/v7/proto/kvs"
"github.com/aerospike/aerospike-client-go/v7/types"
)
// ExecuteTask is used to poll for long running server execute job completion.
type ExecuteTask struct {
*baseTask
taskID uint64
scan bool
clnt *ProxyClient
// The following map keeps an account of what nodes were ever observed with the job registered on them.
// If the job was ever observed, the task will return true for it is not found anymore (purged from task queue after completion)
observed map[string]struct{}
}
// NewExecuteTask initializes task with fields needed to query server nodes.
func NewExecuteTask(cluster *Cluster, statement *Statement) *ExecuteTask {
return &ExecuteTask{
baseTask: newTask(cluster),
taskID: statement.TaskId,
scan: statement.IsScan(),
observed: make(map[string]struct{}, len(cluster.GetNodes())),
}
}
// newGRPCExecuteTask initializes task with fields needed to query server nodes.
func newGRPCExecuteTask(clnt *ProxyClient, statement *Statement) *ExecuteTask {
return &ExecuteTask{
baseTask: newTask(nil),
taskID: statement.TaskId,
scan: statement.IsScan(),
clnt: clnt,
}
}
// TaskId returns the task id that was sent to the server.
func (etsk *ExecuteTask) TaskId() uint64 {
return etsk.taskID
}
// IsDone queries all nodes for task completion status.
func (etsk *ExecuteTask) IsDone() (bool, Error) {
if etsk.clnt != nil {
return etsk.grpcIsDone()
}
var module string
if etsk.scan {
module = "scan"
} else {
module = "query"
}
taskId := strconv.FormatUint(etsk.taskID, 10)
cmd1 := "query-show:trid=" + taskId
cmd2 := module + "-show:trid=" + taskId
cmd3 := "jobs:module=" + module + ";cmd=get-job;trid=" + taskId
nodes := etsk.cluster.GetNodes()
for _, node := range nodes {
var command string
if node.SupportsPartitionQuery() {
// query-show works for both scan and query.
command = cmd1
} else if node.SupportsQueryShow() {
command = cmd2
} else {
command = cmd3
}
responseMap, err := node.requestInfoWithRetry(&etsk.cluster.infoPolicy, 5, command)
if err != nil {
return false, err
}
response := responseMap[command]
if strings.HasPrefix(response, "ERROR:2") {
// If the server node is v6+, it will immediately put the job on queue, so if it is not found,
// it means that it is completed.
if !node.SupportsPartitionQuery() {
// Task not found. On server prior to v6, this could mean task was already completed or not started yet.
// If the job was not observed before, its completion is in doubt.
// Otherwise it means it was completed.
if _, existed := etsk.observed[node.GetName()]; !existed && etsk.retries.Get() < 20 {
// If the job was not found in some nodes, it may mean that the job was not started yet.
// So we will keep retrying.
return false, nil
}
}
// Assume the task was completed.
continue
}
if strings.HasPrefix(response, "ERROR:") {
// Mark done and quit immediately.
return false, newError(types.UDF_BAD_RESPONSE, response)
}
// mark the node as observed
etsk.observed[node.GetName()] = struct{}{}
find := "status="
index := strings.Index(response, find)
if index < 0 {
return false, nil
}
begin := index + len(find)
response = response[begin:]
find = ":"
index = strings.Index(response, find)
if index < 0 {
continue
}
status := strings.ToLower(response[:index])
if !strings.HasPrefix(status, "done") {
return false, nil
}
}
return true, nil
}
// OnComplete returns a channel which will be closed when the task is
// completed.
// If an error is encountered while performing the task, an error
// will be sent on the channel.
func (etsk *ExecuteTask) OnComplete() chan Error {
return etsk.onComplete(etsk)
}
func (etsk *ExecuteTask) grpcIsDone() (bool, Error) {
statusReq := &kvs.BackgroundTaskStatusRequest{
TaskId: int64(etsk.taskID),
IsScan: etsk.scan,
}
req := kvs.AerospikeRequestPayload{
Id: rand.Uint32(),
Iteration: 1,
BackgroundTaskStatusRequest: statusReq,
}
conn, err := etsk.clnt.grpcConn()
if err != nil {
return false, err
}
client := kvs.NewQueryClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), NewInfoPolicy().Timeout)
defer cancel()
streamRes, gerr := client.BackgroundTaskStatus(ctx, &req)
if gerr != nil {
return false, newGrpcError(true, gerr, gerr.Error())
}
for {
time.Sleep(time.Second)
res, gerr := streamRes.Recv()
if gerr != nil {
e := newGrpcError(true, gerr)
return false, e
}
if res.GetStatus() != 0 {
e := newGrpcStatusError(res)
etsk.clnt.returnGrpcConnToPool(conn)
return false, e
}
switch res.GetBackgroundTaskStatus() {
case kvs.BackgroundTaskStatus_COMPLETE:
etsk.clnt.returnGrpcConnToPool(conn)
return true, nil
default:
etsk.clnt.returnGrpcConnToPool(conn)
return false, nil
}
}
}