2021-02-02 12:06:37 +00:00
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package steward
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import (
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2021-03-29 11:36:30 +00:00
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"bytes"
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2021-02-03 21:08:28 +00:00
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"encoding/json"
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2021-02-02 12:06:37 +00:00
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"fmt"
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2021-08-23 14:00:48 +00:00
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"io"
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2022-01-26 08:23:02 +00:00
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"io/ioutil"
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2021-02-02 12:06:37 +00:00
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"log"
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2021-08-23 14:00:48 +00:00
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"net"
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2021-09-10 03:26:16 +00:00
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"net/http"
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2021-08-23 14:00:48 +00:00
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"os"
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2022-01-26 08:23:02 +00:00
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"path/filepath"
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2021-02-02 12:06:37 +00:00
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)
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2022-01-26 08:23:02 +00:00
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// readStartupFolder will check the <workdir>/startup folder when Steward
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// starts for messages to process.
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// The purpose of the startup folder is that we can define messages on a
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// node that will be run when Steward starts up.
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// Messages defined in the startup folder should have the toNode set to
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// self, and the from node set to where we want the answer sent. The reason
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// for this is that all replies normally pick up the host from the original
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// first message, but here we inject it on an end node so we need to specify
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// the fromNode to get the reply back to the node we want.
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func (s *server) readStartupFolder() {
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// Get the names of all the files in the startup folder.
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const startupFolder = "startup"
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filePaths, err := s.getFilePaths(startupFolder)
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if err != nil {
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er := fmt.Errorf("error: readStartupFolder: unable to get filenames: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er)
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return
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}
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for _, filePath := range filePaths {
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// Read the content of each file.
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readBytes, err := func(filePath string) ([]byte, error) {
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fh, err := os.Open(filePath)
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if err != nil {
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er := fmt.Errorf("error: failed to open file in startup folder: %v", err)
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return nil, er
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}
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defer fh.Close()
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b, err := io.ReadAll(fh)
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if err != nil {
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er := fmt.Errorf("error: failed to read file in startup folder: %v", err)
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return nil, er
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}
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return b, nil
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}(filePath)
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if err != nil {
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s.errorKernel.errSend(s.processInitial, Message{}, err)
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continue
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}
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readBytes = bytes.Trim(readBytes, "\x00")
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// unmarshal the JSON into a struct
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sams, err := s.convertBytesToSAMs(readBytes)
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if err != nil {
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er := fmt.Errorf("error: startup folder: malformed json read: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er)
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continue
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}
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// Check if fromNode field is specified, and remove the message if blank.
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for i := range sams {
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if sams[i].Message.FromNode == "" {
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sams = append(sams[:i], sams[i+1:]...)
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2022-02-18 08:51:11 +00:00
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er := fmt.Errorf(" error: missing from field in startup message")
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s.errorKernel.errSend(s.processInitial, Message{}, er)
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2022-01-26 08:23:02 +00:00
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}
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// Bounds check.
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if i == len(sams)-1 {
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break
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}
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}
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// Send the SAM struct to be picked up by the ring buffer.
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s.ringBufferBulkInCh <- sams
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}
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}
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// getFilePaths will get the names of all the messages in
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// the folder specified from current working directory.
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func (s *server) getFilePaths(dirName string) ([]string, error) {
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2022-02-22 08:41:59 +00:00
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dirPath, err := os.Executable()
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dirPath = filepath.Dir(dirPath)
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fmt.Printf(" * DEBUG: %v\n", dirPath)
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2022-01-26 08:23:02 +00:00
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if err != nil {
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return nil, fmt.Errorf("error: startup folder: unable to get the working directory %v: %v", dirPath, err)
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}
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dirPath = filepath.Join(dirPath, dirName)
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// Check if the startup folder exist.
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if _, err := os.Stat(dirPath); os.IsNotExist(err) {
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err := os.MkdirAll(dirPath, 0700)
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if err != nil {
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er := fmt.Errorf("error: failed to create startup folder: %v", err)
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return nil, er
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}
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}
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fInfo, err := ioutil.ReadDir(dirPath)
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if err != nil {
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er := fmt.Errorf("error: failed to get filenames in startup folder: %v", err)
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return nil, er
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}
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filePaths := []string{}
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for _, v := range fInfo {
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realpath := filepath.Join(dirPath, v.Name())
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filePaths = append(filePaths, realpath)
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}
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return filePaths, nil
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}
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2021-03-29 11:36:30 +00:00
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// readSocket will read the .sock file specified.
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// It will take a channel of []byte as input, and it is in this
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// channel the content of a file that has changed is returned.
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2021-08-25 08:16:55 +00:00
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func (s *server) readSocket() {
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2021-03-29 11:36:30 +00:00
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// Loop, and wait for new connections.
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for {
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2021-08-09 12:41:31 +00:00
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conn, err := s.StewardSocket.Accept()
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2021-02-05 06:25:12 +00:00
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if err != nil {
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2021-03-29 11:36:30 +00:00
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er := fmt.Errorf("error: failed to accept conn on socket: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-02-05 06:25:12 +00:00
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}
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2021-08-23 14:08:21 +00:00
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go func(conn net.Conn) {
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defer conn.Close()
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2021-02-05 09:47:07 +00:00
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2021-08-23 14:08:21 +00:00
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var readBytes []byte
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2021-03-29 11:36:30 +00:00
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2021-08-23 14:08:21 +00:00
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for {
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b := make([]byte, 1500)
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_, err = conn.Read(b)
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if err != nil && err != io.EOF {
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er := fmt.Errorf("error: failed to read data from tcp listener: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-08-23 14:08:21 +00:00
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return
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}
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2021-02-02 12:06:37 +00:00
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2021-08-23 14:08:21 +00:00
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readBytes = append(readBytes, b...)
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2021-03-29 11:36:30 +00:00
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2021-08-23 14:08:21 +00:00
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if err == io.EOF {
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break
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}
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}
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readBytes = bytes.Trim(readBytes, "\x00")
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// unmarshal the JSON into a struct
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2021-08-26 04:35:54 +00:00
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sams, err := s.convertBytesToSAMs(readBytes)
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2021-08-23 14:08:21 +00:00
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if err != nil {
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2021-09-23 06:19:53 +00:00
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er := fmt.Errorf("error: malformed json received on socket: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-08-23 14:08:21 +00:00
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return
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}
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2021-08-25 08:16:55 +00:00
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for i := range sams {
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2021-08-23 14:08:21 +00:00
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// Fill in the value for the FromNode field, so the receiver
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// can check this field to know where it came from.
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2021-08-25 08:16:55 +00:00
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sams[i].Message.FromNode = Node(s.nodeName)
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2021-08-23 14:08:21 +00:00
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}
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2021-02-05 06:25:12 +00:00
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2021-08-23 14:08:21 +00:00
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// Send the SAM struct to be picked up by the ring buffer.
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2022-01-20 07:17:37 +00:00
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s.ringBufferBulkInCh <- sams
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2021-03-31 06:56:13 +00:00
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2021-08-23 14:08:21 +00:00
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}(conn)
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2021-02-05 06:25:12 +00:00
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}
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2021-02-02 12:06:37 +00:00
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}
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2021-08-23 14:00:48 +00:00
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// readTCPListener wait and read messages delivered on the TCP
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// port if started.
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// It will take a channel of []byte as input, and it is in this
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// channel the content of a file that has changed is returned.
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2021-09-09 11:32:04 +00:00
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func (s *server) readTCPListener() {
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2021-08-23 14:00:48 +00:00
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ln, err := net.Listen("tcp", s.configuration.TCPListener)
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if err != nil {
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log.Printf("error: readTCPListener: failed to start tcp listener: %v\n", err)
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os.Exit(1)
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}
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// Loop, and wait for new connections.
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for {
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conn, err := ln.Accept()
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if err != nil {
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er := fmt.Errorf("error: failed to accept conn on socket: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-08-23 14:00:48 +00:00
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continue
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}
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go func(conn net.Conn) {
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defer conn.Close()
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var readBytes []byte
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for {
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b := make([]byte, 1500)
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_, err = conn.Read(b)
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if err != nil && err != io.EOF {
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er := fmt.Errorf("error: failed to read data from tcp listener: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-08-23 14:00:48 +00:00
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return
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}
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readBytes = append(readBytes, b...)
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if err == io.EOF {
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break
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}
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}
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readBytes = bytes.Trim(readBytes, "\x00")
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// unmarshal the JSON into a struct
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2021-08-26 04:35:54 +00:00
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sam, err := s.convertBytesToSAMs(readBytes)
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2021-08-23 14:00:48 +00:00
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if err != nil {
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2021-09-23 06:19:53 +00:00
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er := fmt.Errorf("error: malformed json received on tcp listener: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-08-23 14:00:48 +00:00
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return
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}
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for i := range sam {
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// Fill in the value for the FromNode field, so the receiver
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// can check this field to know where it came from.
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sam[i].Message.FromNode = Node(s.nodeName)
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}
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// Send the SAM struct to be picked up by the ring buffer.
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2022-01-20 07:17:37 +00:00
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s.ringBufferBulkInCh <- sam
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2021-08-23 14:00:48 +00:00
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}(conn)
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}
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}
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2021-09-10 03:26:16 +00:00
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func (s *server) readHTTPlistenerHandler(w http.ResponseWriter, r *http.Request) {
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2021-09-10 04:06:43 +00:00
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var readBytes []byte
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for {
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b := make([]byte, 1500)
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_, err := r.Body.Read(b)
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if err != nil && err != io.EOF {
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er := fmt.Errorf("error: failed to read data from tcp listener: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-09-10 04:06:43 +00:00
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return
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}
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readBytes = append(readBytes, b...)
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if err == io.EOF {
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break
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}
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}
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readBytes = bytes.Trim(readBytes, "\x00")
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// unmarshal the JSON into a struct
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sam, err := s.convertBytesToSAMs(readBytes)
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2021-09-10 03:26:16 +00:00
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if err != nil {
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2021-09-23 06:19:53 +00:00
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er := fmt.Errorf("error: malformed json received on HTTPListener: %v", err)
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2022-01-19 09:55:03 +00:00
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s.processes.errorKernel.errSend(s.processInitial, Message{}, er)
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2021-09-10 04:06:43 +00:00
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return
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}
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for i := range sam {
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// Fill in the value for the FromNode field, so the receiver
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// can check this field to know where it came from.
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sam[i].Message.FromNode = Node(s.nodeName)
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2021-09-10 03:26:16 +00:00
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}
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2021-09-10 04:06:43 +00:00
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// Send the SAM struct to be picked up by the ring buffer.
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2022-01-20 07:17:37 +00:00
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s.ringBufferBulkInCh <- sam
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2021-09-10 03:26:16 +00:00
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}
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func (s *server) readHttpListener() {
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go func() {
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n, err := net.Listen("tcp", s.configuration.HTTPListener)
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if err != nil {
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log.Printf("error: startMetrics: failed to open prometheus listen port: %v\n", err)
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os.Exit(1)
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}
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mux := http.NewServeMux()
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2021-09-10 03:45:09 +00:00
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mux.HandleFunc("/", s.readHTTPlistenerHandler)
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2021-09-10 03:26:16 +00:00
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err = http.Serve(n, mux)
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if err != nil {
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log.Printf("error: startMetrics: failed to start http.Serve: %v\n", err)
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os.Exit(1)
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}
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}()
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}
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2021-08-16 11:01:12 +00:00
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// The subject are made up of different parts of the message field.
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// To make things easier and to avoid figuring out what the subject
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// is in all places we've created the concept of subjectAndMessage
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// (sam) where we get the subject for the message once, and use the
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// sam structure with subject alongside the message instead.
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2021-02-10 09:14:49 +00:00
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type subjectAndMessage struct {
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2021-02-04 10:46:58 +00:00
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Subject `json:"subject" yaml:"subject"`
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Message `json:"message" yaml:"message"`
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2021-02-03 21:08:28 +00:00
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}
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2021-08-25 08:16:55 +00:00
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// convertBytesToSAMs will range over the byte representing a message given in
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2021-03-29 11:36:30 +00:00
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// json format. For each element found the Message type will be converted into
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|
|
|
// a SubjectAndMessage type value and appended to a slice, and the slice is
|
|
|
|
// returned to the caller.
|
2021-08-26 04:35:54 +00:00
|
|
|
func (s *server) convertBytesToSAMs(b []byte) ([]subjectAndMessage, error) {
|
2021-02-10 09:14:49 +00:00
|
|
|
MsgSlice := []Message{}
|
2021-02-03 21:08:28 +00:00
|
|
|
|
2021-02-10 09:14:49 +00:00
|
|
|
err := json.Unmarshal(b, &MsgSlice)
|
2021-02-03 21:08:28 +00:00
|
|
|
if err != nil {
|
2021-02-04 10:46:58 +00:00
|
|
|
return nil, fmt.Errorf("error: unmarshal of file failed: %#v", err)
|
2021-02-03 21:08:28 +00:00
|
|
|
}
|
|
|
|
|
2021-08-26 05:02:36 +00:00
|
|
|
// Check for toNode and toNodes field.
|
2021-08-26 04:35:54 +00:00
|
|
|
MsgSlice = s.checkMessageToNodes(MsgSlice)
|
2021-08-26 08:50:40 +00:00
|
|
|
s.metrics.promUserMessagesTotal.Add(float64(len(MsgSlice)))
|
2021-08-26 04:35:54 +00:00
|
|
|
|
|
|
|
sam := []subjectAndMessage{}
|
|
|
|
|
|
|
|
// Range over all the messages parsed from json, and create a subject for
|
|
|
|
// each message.
|
|
|
|
for _, m := range MsgSlice {
|
|
|
|
sm, err := newSubjectAndMessage(m)
|
|
|
|
if err != nil {
|
2022-02-18 08:51:11 +00:00
|
|
|
er := fmt.Errorf("error: newSubjectAndMessage: %v", err)
|
|
|
|
s.processes.errorKernel.errSend(s.processInitial, m, er)
|
|
|
|
|
2021-08-26 04:35:54 +00:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
sam = append(sam, sm)
|
|
|
|
}
|
|
|
|
|
|
|
|
return sam, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// checkMessageToNodes will check that either toHost or toHosts are
|
|
|
|
// specified in the message. If not specified it will drop the message
|
|
|
|
// and send an error.
|
|
|
|
// if toNodes is specified, the original message will be used, and
|
|
|
|
// and an individual message will be created with a toNode field for
|
|
|
|
// each if the toNodes specified.
|
|
|
|
func (s *server) checkMessageToNodes(MsgSlice []Message) []Message {
|
|
|
|
msgs := []Message{}
|
2021-08-26 04:08:39 +00:00
|
|
|
|
|
|
|
for _, v := range MsgSlice {
|
|
|
|
switch {
|
|
|
|
// if toNode specified, we don't care about the toHosts.
|
|
|
|
case v.ToNode != "":
|
2021-08-26 04:35:54 +00:00
|
|
|
msgs = append(msgs, v)
|
2021-08-26 04:08:39 +00:00
|
|
|
continue
|
|
|
|
|
|
|
|
// if toNodes specified, we use the original message, and
|
|
|
|
// create new node messages for each of the nodes specified.
|
|
|
|
case len(v.ToNodes) != 0:
|
|
|
|
for _, n := range v.ToNodes {
|
|
|
|
m := v
|
2021-08-26 04:35:54 +00:00
|
|
|
// Set the toNodes field to nil since we're creating
|
|
|
|
// an individual toNode message for each of the toNodes
|
|
|
|
// found, and hence we no longer need that field.
|
2021-08-26 04:08:39 +00:00
|
|
|
m.ToNodes = nil
|
|
|
|
m.ToNode = n
|
2021-08-26 04:35:54 +00:00
|
|
|
msgs = append(msgs, m)
|
2021-08-26 04:08:39 +00:00
|
|
|
}
|
|
|
|
continue
|
|
|
|
|
|
|
|
// No toNode or toNodes specified. Drop the message by not appending it to
|
|
|
|
// the slice since it is not valid.
|
|
|
|
default:
|
2021-09-23 06:19:53 +00:00
|
|
|
er := fmt.Errorf("error: no toNode or toNodes where specified in the message, dropping message: %v", v)
|
2022-01-19 09:55:03 +00:00
|
|
|
s.processes.errorKernel.errSend(s.processInitial, v, er)
|
2021-08-26 04:08:39 +00:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-08-26 04:35:54 +00:00
|
|
|
return msgs
|
2021-02-03 21:08:28 +00:00
|
|
|
}
|
|
|
|
|
2021-08-25 06:56:44 +00:00
|
|
|
// newSubjectAndMessage will look up the correct values and value types to
|
2021-08-16 11:01:12 +00:00
|
|
|
// be used in a subject for a Message (sam), and return the a combined structure
|
2021-03-10 06:11:14 +00:00
|
|
|
// of type subjectAndMessage.
|
2021-08-25 06:56:44 +00:00
|
|
|
func newSubjectAndMessage(m Message) (subjectAndMessage, error) {
|
2021-03-10 06:11:14 +00:00
|
|
|
// We need to create a tempory method type to look up the kind for the
|
|
|
|
// real method for the message.
|
|
|
|
var mt Method
|
|
|
|
|
2021-03-12 11:08:11 +00:00
|
|
|
tmpH := mt.getHandler(m.Method)
|
|
|
|
if tmpH == nil {
|
2021-11-11 12:43:32 +00:00
|
|
|
return subjectAndMessage{}, fmt.Errorf("error: newSubjectAndMessage: no such request type defined: %v", m.Method)
|
|
|
|
}
|
|
|
|
|
|
|
|
switch {
|
|
|
|
case m.ToNode == "":
|
|
|
|
return subjectAndMessage{}, fmt.Errorf("error: newSubjectAndMessage: ToNode empty: %+v", m)
|
|
|
|
case m.Method == "":
|
|
|
|
return subjectAndMessage{}, fmt.Errorf("error: newSubjectAndMessage: Method empty: %v", m)
|
2021-03-12 11:08:11 +00:00
|
|
|
}
|
|
|
|
|
2021-03-10 06:11:14 +00:00
|
|
|
sub := Subject{
|
2022-01-27 09:06:06 +00:00
|
|
|
ToNode: string(m.ToNode),
|
|
|
|
Event: tmpH.getKind(),
|
|
|
|
Method: m.Method,
|
2021-03-10 06:11:14 +00:00
|
|
|
}
|
|
|
|
|
2021-08-25 06:56:44 +00:00
|
|
|
sam := subjectAndMessage{
|
2021-03-10 06:11:14 +00:00
|
|
|
Subject: sub,
|
|
|
|
Message: m,
|
|
|
|
}
|
|
|
|
|
2021-08-25 06:56:44 +00:00
|
|
|
return sam, nil
|
2021-03-10 06:11:14 +00:00
|
|
|
}
|