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conductorworker.go
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conductorworker.go
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// Copyright 2017 Netflix, 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 conductor
import (
"os"
"time"
"log"
"conductor/task"
)
var (
hostname, hostnameError = os.Hostname()
)
func init() {
if hostnameError != nil {
log.Fatal("Could not get hostname")
}
}
type ConductorWorker struct {
ConductorHttpClient *ConductorHttpClient
ThreadCount int
PollingInterval int
}
func NewConductorWorker(baseUrl string, threadCount int, pollingInterval int) *ConductorWorker {
conductorWorker := new(ConductorWorker)
conductorWorker.ThreadCount = threadCount
conductorWorker.PollingInterval = pollingInterval
conductorHttpClient := NewConductorHttpClient(baseUrl)
conductorWorker.ConductorHttpClient = conductorHttpClient
return conductorWorker
}
func (c *ConductorWorker) Execute(taskData string, executeFunction func(t *task.Task) (*task.TaskResult, error)) {
t, err := task.ParseTask(taskData)
if err != nil {
log.Println("Error Parsing task")
return
}
taskResult, err := executeFunction(t)
if err != nil {
log.Println("Error Executing task")
return
}
taskResultJsonString, err := taskResult.ToJSONString()
if err != nil {
log.Println(err)
log.Println("Error Forming TaskResult JSON body")
return
}
c.ConductorHttpClient.UpdateTask(taskResultJsonString)
}
func (c *ConductorWorker) PollAndExecute(taskType string, executeFunction func(t *task.Task) (*task.TaskResult, error)) {
for {
time.Sleep(time.Duration(c.PollingInterval) * time.Millisecond)
polled, err := c.ConductorHttpClient.PollForTask(taskType, hostname)
if err == nil {
c.Execute(polled, executeFunction)
}
}
}
func (c *ConductorWorker) Start(taskType string, executeFunction func(t *task.Task) (*task.TaskResult, error), wait bool) {
log.Println("Polling for task:", taskType, "with a:", c.PollingInterval, "(ms) polling interval with", c.ThreadCount, "goroutines for task execution, with workerid as", hostname)
for i := 1; i <= c.ThreadCount; i++ {
go c.PollAndExecute(taskType, executeFunction)
}
// wait infinitely while the go routines are running
if wait {
select{}
}
}