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pythonDriver.go
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pythonDriver.go
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/*-
* Copyright (c) 2019-2021, F5 Networks, 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 main
import (
"bufio"
"fmt"
"os/exec"
"strings"
"syscall"
"time"
"github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/writer"
log "github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/vlogger"
)
func initializeDriverConfig(
configWriter writer.Writer,
global globalSection,
bigIP bigIPSection,
) error {
if nil == configWriter {
return fmt.Errorf("config writer argument cannot be nil")
}
sectionNames := []string{"global", "bigip"}
for i, v := range []interface{}{global, bigIP} {
doneCh, errCh, err := configWriter.SendSection(sectionNames[i], v)
if nil != err {
return fmt.Errorf("failed writing global config section: %v", err)
}
select {
case <-doneCh:
case e := <-errCh:
return fmt.Errorf("failed writing section %s - %v: %v",
sectionNames[i], e, v)
case <-time.After(1000 * time.Millisecond):
log.Warning("Did not receive config write response in 1 second")
}
}
return nil
}
func createDriverCmd(
configFilename string,
pyCmd string,
) *exec.Cmd {
var cmd *exec.Cmd
if pyCmd == "bigipconfigdriver.py" {
cmdArgs := []string{
"--config-file", configFilename,
"--ctlr-prefix", "k8s"}
cmd = exec.Command(pyCmd, cmdArgs...)
} else {
cmdName := "python3"
cmdArgs := []string{
pyCmd,
"--config-file", configFilename,
"--ctlr-prefix", "k8s"}
cmd = exec.Command(cmdName, cmdArgs...)
}
return cmd
}
func runBigIPDriver(pid chan<- int, cmd *exec.Cmd) {
defer close(pid)
// the config driver python logging goes to stderr by default
cmdOut, _ := cmd.StderrPipe()
go func() {
bufsize := bufio.MaxScanTokenSize
for {
scanOut := bufio.NewScanner(cmdOut)
scanOut.Buffer(make([]byte, 0, bufsize), bufsize)
for scanOut.Scan() {
if strings.Contains(scanOut.Text(), "DEBUG]") {
log.Debug(scanOut.Text())
} else if strings.Contains(scanOut.Text(), "WARNING]") {
log.Warning(scanOut.Text())
} else if strings.Contains(scanOut.Text(), "ERROR]") {
log.Error(scanOut.Text())
} else if strings.Contains(scanOut.Text(), "CRITICAL]") {
log.Critical(scanOut.Text())
} else {
log.Info(scanOut.Text())
}
}
if scanOut.Err() == bufio.ErrTooLong {
bufsize *= 2
log.Infof("Double the bufsize to %d", bufsize)
} else {
if scanOut.Err() != nil {
log.Errorf("unexpected error: %s", scanOut.Err().Error())
}
break
}
}
}()
err := cmd.Start()
if nil != err {
log.Fatalf("Internal error: failed to start config driver: %v", err)
}
log.Infof("Started config driver sub-process at pid: %d", cmd.Process.Pid)
pid <- cmd.Process.Pid
err = cmd.Wait()
var waitStatus syscall.WaitStatus
if exitError, ok := err.(*exec.ExitError); ok {
waitStatus = exitError.Sys().(syscall.WaitStatus)
if waitStatus.Signaled() {
log.Fatalf("Config driver signaled to stop: %d - %s",
waitStatus.Signal(), waitStatus.Signal())
} else {
log.Fatalf("Config driver exited: %d", waitStatus.ExitStatus())
}
} else if nil != err {
log.Fatalf("Config driver exited with error: %v", err)
} else {
waitStatus = cmd.ProcessState.Sys().(syscall.WaitStatus)
log.Warningf("Config driver exited normally: %d", waitStatus.ExitStatus())
}
}
// Start called to run the python driver
func startPythonDriver(
configWriter writer.Writer,
global globalSection,
bigIP bigIPSection,
pythonBaseDir string,
) (<-chan int, error) {
var pyCmd string
err := initializeDriverConfig(configWriter, global, bigIP)
if nil != err {
return nil, err
}
subPidCh := make(chan int)
if len(pythonBaseDir) != 0 && pythonBaseDir != "/app/python" {
log.Warning("DEPRECATED: python-basedir: option may no longer work as expected.")
pyCmd = fmt.Sprintf("%s/bigipconfigdriver.py", pythonBaseDir)
} else {
pyCmd = "bigipconfigdriver.py"
}
cmd := createDriverCmd(
configWriter.GetOutputFilename(),
pyCmd,
)
go runBigIPDriver(subPidCh, cmd)
return subPidCh, nil
}