// processSendCommandMessage processes a single send command message received from MDS.
func (p *Processor) processSendCommandMessage(context context.T,
mdsService service.Service,
messagesOrchestrationRootDir string,
runPlugins PluginRunner,
cancelFlag task.CancelFlag,
buildReply replyBuilder,
sendResponse engine.SendResponse,
msg ssmmds.Message) {
commandID := getCommandID(*msg.MessageId)
log := context.Log()
log.Debug("Processing send command message ", *msg.MessageId)
log.Trace("Processing send command message ", jsonutil.Indent(*msg.Payload))
parsedMessage, err := parser.ParseMessageWithParams(log, *msg.Payload)
if err != nil {
log.Error("format of received message is invalid ", err)
err = mdsService.FailMessage(log, *msg.MessageId, service.InternalHandlerException)
if err != nil {
sdkutil.HandleAwsError(log, err, p.processorStopPolicy)
}
return
}
parsedMessageContent, _ := jsonutil.Marshal(parsedMessage)
log.Debug("ParsedMessage is ", jsonutil.Indent(parsedMessageContent))
// adapt plugin configuration format from MDS to plugin expected format
s3KeyPrefix := path.Join(parsedMessage.OutputS3KeyPrefix, parsedMessage.CommandID, *msg.Destination)
messageOrchestrationDirectory := filepath.Join(messagesOrchestrationRootDir, commandID)
// Check if it is a managed instance and its executing managed instance incompatible AWS SSM public document.
// A few public AWS SSM documents contain code which is not compatible when run on managed instances.
// isManagedInstanceIncompatibleAWSSSMDocument makes sure to find such documents at runtime and replace the incompatible code.
isMI, err := isManagedInstance()
if err != nil {
log.Errorf("Error determining managed instance. error: %v", err)
}
if isMI && isManagedInstanceIncompatibleAWSSSMDocument(parsedMessage.DocumentName) {
log.Debugf("Running Incompatible AWS SSM Document %v on managed instance", parsedMessage.DocumentName)
if parsedMessage, err = removeDependencyOnInstanceMetadataForManagedInstance(context, parsedMessage); err != nil {
return
}
}
pluginConfigurations := getPluginConfigurations(
parsedMessage.DocumentContent.RuntimeConfig,
messageOrchestrationDirectory,
parsedMessage.OutputS3BucketName,
s3KeyPrefix,
*msg.MessageId)
//persist : all information in current folder
log.Info("Persisting message in current execution folder")
//Data format persisted in Current Folder is defined by the struct - CommandState
interimCmdState := initializeCommandState(pluginConfigurations, msg, parsedMessage)
// persist new interim command state in current folder
commandStateHelper.PersistData(log, commandID, *msg.Destination, appconfig.DefaultLocationOfCurrent, interimCmdState)
//Deleting from pending folder since the command is getting executed
commandStateHelper.RemoveData(log, commandID, *msg.Destination, appconfig.DefaultLocationOfPending)
log.Debug("Running plugins...")
outputs := runPlugins(context, *msg.MessageId, pluginConfigurations, sendResponse, cancelFlag)
pluginOutputContent, _ := jsonutil.Marshal(outputs)
log.Debugf("Plugin outputs %v", jsonutil.Indent(pluginOutputContent))
payloadDoc := buildReply("", outputs)
//check if document isn't supported by SSM -> update the DocumentLevel status message & send reply accordingly
ssmDocName := parsedMessage.DocumentName
if IsDocumentNotSupportedBySsmAgent(ssmDocName) {
log.Infof("%s is not yet supported by aws-ssm-agent, setting up Document level response accordingly", ssmDocName)
payloadDoc.DocumentTraceOutput = fmt.Sprintf("%s document is not yet supported by amazon-ssm-agent.", ssmDocName)
p.sendDocLevelResponse(*msg.MessageId, contracts.ResultStatusFailed, payloadDoc.DocumentTraceOutput)
}
//update documentInfo in interim cmd state file
documentInfo := commandStateHelper.GetDocumentInfo(log, commandID, *msg.Destination, appconfig.DefaultLocationOfCurrent)
// set document level information which wasn't set previously
documentInfo.AdditionalInfo = payloadDoc.AdditionalInfo
documentInfo.DocumentStatus = payloadDoc.DocumentStatus
documentInfo.DocumentTraceOutput = payloadDoc.DocumentTraceOutput
documentInfo.RuntimeStatus = payloadDoc.RuntimeStatus
//persist final documentInfo.
commandStateHelper.PersistDocumentInfo(log,
documentInfo,
commandID,
*msg.Destination,
appconfig.DefaultLocationOfCurrent)
// Skip sending response when the document requires a reboot
if documentInfo.DocumentStatus == contracts.ResultStatusSuccessAndReboot {
log.Debug("skipping sending response of %v since the document requires a reboot", *msg.MessageId)
return
}
log.Debug("Sending reply on message completion ", outputs)
sendResponse(*msg.MessageId, "", outputs)
//persist : commands execution in completed folder (terminal state folder)
log.Debugf("execution of %v is over. Moving interimState file from Current to Completed folder", *msg.MessageId)
commandStateHelper.MoveCommandState(log,
commandID,
*msg.Destination,
appconfig.DefaultLocationOfCurrent,
appconfig.DefaultLocationOfCompleted)
log.Debugf("Deleting message")
isUpdate := false
for pluginName := range pluginConfigurations {
if pluginName == appconfig.PluginNameAwsAgentUpdate {
isUpdate = true
}
}
if !isUpdate {
err = mdsService.DeleteMessage(log, *msg.MessageId)
if err != nil {
sdkutil.HandleAwsError(log, err, p.processorStopPolicy)
}
} else {
log.Debug("MessageDeletion skipped as it will be handled by external process")
}
}
// runCmdsUsingCmdState takes commandState as an input and executes only those plugins which haven't yet executed. This is functionally
// very similar to processSendCommandMessage because everything to do with cmd execution is part of that function right now.
func (p *Processor) runCmdsUsingCmdState(context context.T,
mdsService service.Service,
runPlugins PluginRunner,
cancelFlag task.CancelFlag,
buildReply replyBuilder,
sendResponse engine.SendResponse,
command messageContracts.CommandState) {
log := context.Log()
var pluginConfigurations map[string]*contracts.Configuration
pendingPlugins := false
pluginConfigurations = make(map[string]*contracts.Configuration)
//iterate through all plugins to find all plugins that haven't executed yet.
for k, v := range command.PluginsInformation {
if v.HasExecuted {
log.Debugf("skipping execution of Plugin - %v of command - %v since it has already executed.", k, command.DocumentInformation.CommandID)
} else {
log.Debugf("Plugin - %v of command - %v will be executed", k, command.DocumentInformation.CommandID)
pluginConfigurations[k] = &v.Configuration
pendingPlugins = true
}
}
//execute plugins that haven't been executed yet
//individual plugins after execution will update interim cmd state file accordingly
if pendingPlugins {
log.Debugf("executing following plugins of command - %v", command.DocumentInformation.CommandID)
for k := range pluginConfigurations {
log.Debugf("Plugin: %v", k)
}
//Since only some plugins of a cmd gets executed here - there is no need to get output from engine & construct the sendReply output.
//Instead after all plugins of a command get executed, use persisted data to construct sendReply payload
runPlugins(context, command.DocumentInformation.MessageID, pluginConfigurations, sendResponse, cancelFlag)
}
//read from persisted file
newCmdState := commandStateHelper.GetCommandInterimState(log,
command.DocumentInformation.CommandID,
command.DocumentInformation.Destination,
appconfig.DefaultLocationOfCurrent)
//construct sendReply payload
outputs := make(map[string]*contracts.PluginResult)
for k, v := range newCmdState.PluginsInformation {
outputs[k] = &v.Result
}
pluginOutputContent, _ := jsonutil.Marshal(outputs)
log.Debugf("plugin outputs %v", jsonutil.Indent(pluginOutputContent))
payloadDoc := buildReply("", outputs)
//update interim cmd state file with document level information
var documentInfo messageContracts.DocumentInfo
// set document level information which wasn't set previously
documentInfo.AdditionalInfo = payloadDoc.AdditionalInfo
documentInfo.DocumentStatus = payloadDoc.DocumentStatus
documentInfo.DocumentTraceOutput = payloadDoc.DocumentTraceOutput
documentInfo.RuntimeStatus = payloadDoc.RuntimeStatus
//persist final documentInfo.
commandStateHelper.PersistDocumentInfo(log,
documentInfo,
command.DocumentInformation.CommandID,
command.DocumentInformation.Destination,
appconfig.DefaultLocationOfCurrent)
// Skip sending response when the document requires a reboot
if documentInfo.DocumentStatus == contracts.ResultStatusSuccessAndReboot {
log.Debug("skipping sending response of %v since the document requires a reboot", newCmdState.DocumentInformation.MessageID)
return
}
//send document level reply
log.Debug("sending reply on message completion ", outputs)
sendResponse(command.DocumentInformation.MessageID, "", outputs)
//persist : commands execution in completed folder (terminal state folder)
log.Debugf("execution of %v is over. Moving interimState file from Current to Completed folder", newCmdState.DocumentInformation.MessageID)
commandStateHelper.MoveCommandState(log,
newCmdState.DocumentInformation.CommandID,
newCmdState.DocumentInformation.Destination,
appconfig.DefaultLocationOfCurrent,
appconfig.DefaultLocationOfCompleted)
log.Debugf("deleting message")
isUpdate := false
for pluginName := range pluginConfigurations {
if pluginName == appconfig.PluginNameAwsAgentUpdate {
isUpdate = true
}
}
if !isUpdate {
err := mdsService.DeleteMessage(log, newCmdState.DocumentInformation.MessageID)
if err != nil {
sdkutil.HandleAwsError(log, err, p.processorStopPolicy)
}
} else {
log.Debug("messageDeletion skipped as it will be handled by external process")
}
}
