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ctrl/message_readers.go

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package ctrl
import (
"bytes"
"encoding/json"
"fmt"
"io"
"log"
"net"
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"net/http"
"os"
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"path/filepath"
"strings"
"time"
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"github.com/fsnotify/fsnotify"
"github.com/nats-io/nats.go/jetstream"
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"gopkg.in/yaml.v3"
)
// readStartupFolder will check the <workdir>/startup folder when ctrl
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// starts for messages to process.
// The purpose of the startup folder is that we can define messages on a
// node that will be run when ctrl starts up.
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// Messages defined in the startup folder should have the toNode set to
// self, and the from node set to where we want the answer sent. The reason
// for this is that all replies normally pick up the host from the original
// first message, but here we inject it on an end node so we need to specify
// the fromNode to get the reply back to the node we want.
//
// Messages read from the startup folder will be directly called by the handler
// locally, and the message will not be sent via the nats-server.
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func (s *server) readStartupFolder() {
// Get the names of all the files in the startup folder.
const startupFolder = "startup"
filePaths, err := s.getFilePaths(startupFolder)
if err != nil {
er := fmt.Errorf("error: readStartupFolder: unable to get filenames: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
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return
}
for _, fp := range filePaths {
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er := fmt.Errorf("info: ranging filepaths, current filePath contains: %v", fp)
s.errorKernel.logInfo(er)
}
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for _, filePath := range filePaths {
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er := fmt.Errorf("info: reading and working on file from startup folder %v", filePath)
s.errorKernel.logInfo(er)
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// Read the content of each file.
readBytes, err := func(filePath string) ([]byte, error) {
fh, err := os.Open(filePath)
if err != nil {
er := fmt.Errorf("error: failed to open file in startup folder: %v", err)
return nil, er
}
defer fh.Close()
b, err := io.ReadAll(fh)
if err != nil {
er := fmt.Errorf("error: failed to read file in startup folder: %v", err)
return nil, er
}
return b, nil
}(filePath)
if err != nil {
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s.errorKernel.errSend(s.processInitial, Message{}, err, logWarning)
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continue
}
readBytes = bytes.Trim(readBytes, "\x00")
// unmarshal the JSON into a struct
sams, err := s.convertBytesToSAMs(readBytes)
if err != nil {
er := fmt.Errorf("error: startup folder: malformed json read: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
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continue
}
// Check if fromNode field is specified, and remove the message if blank.
for i := range sams {
// We want to allow the use of nodeName local only in startup folder, and
// if used we substite it for the local node name.
if sams[i].Message.ToNode == "local" {
sams[i].Message.ToNode = Node(s.nodeName)
sams[i].Subject.ToNode = s.nodeName
}
switch {
case sams[i].Message.FromNode == "":
// Remove the first message from the slice.
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sams = append(sams[:i], sams[i+1:]...)
er := fmt.Errorf(" error: missing value in fromNode field in startup message, discarding message")
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
case sams[i].Message.ToNode == "" && len(sams[i].Message.ToNodes) == 0:
// Remove the first message from the slice.
sams = append(sams[:i], sams[i+1:]...)
er := fmt.Errorf(" error: missing value in both toNode and toNodes fields in startup message, discarding message")
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
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}
}
j, err := json.MarshalIndent(sams, "", " ")
if err != nil {
log.Printf("test error: %v\n", err)
}
er = fmt.Errorf("%v", string(j))
s.errorKernel.errSend(s.processInitial, Message{}, er, logInfo)
s.samSendLocalCh <- sams
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}
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}
func (s *server) jetstreamPublish() {
// Create a JetStream management interface
js, _ := jetstream.New(s.natsConn)
// Create a stream
_, _ = js.CreateStream(s.ctx, jetstream.StreamConfig{
Name: "NODES",
Subjects: []string{"NODES.>"},
MaxMsgsPerSubject: int64(s.configuration.JetStreamMaxMsgsPerSubject),
})
// Publish messages.
for {
select {
case msg := <-s.jetstreamPublishCh:
b, err := s.messageSerializeAndCompress(msg)
if err != nil {
log.Fatalf("error: jetstreamPublish: marshal of message failed: %v\n", err)
}
subject := string(fmt.Sprintf("NODES.%v", msg.JetstreamToNode))
_, err = js.Publish(s.ctx, subject, b)
if err != nil {
log.Fatalf("error: jetstreamPublish: publish failed: %v\n", err)
}
fmt.Printf("Published jetstream on subject: %q, message: %v\n", subject, msg)
case <-s.ctx.Done():
}
}
}
func (s *server) jetstreamConsume() {
// Create a JetStream management interface
js, _ := jetstream.New(s.natsConn)
// Create a stream
stream, err := js.CreateOrUpdateStream(s.ctx, jetstream.StreamConfig{
Name: "NODES",
Subjects: []string{"NODES.>"},
})
if err != nil {
log.Printf("error: jetstreamConsume: failed to create stream: %v\n", err)
}
// The standard streams we want to consume.
filterSubjectValues := []string{
fmt.Sprintf("NODES.%v", s.nodeName),
"NODES.all",
}
// Check if there are more to consume defined in flags/env.
if s.configuration.JetstreamsConsume != "" {
splitValues := strings.Split(s.configuration.JetstreamsConsume, ",")
for _, v := range splitValues {
filterSubjectValues = append(filterSubjectValues, fmt.Sprintf("NODES.%v", v))
}
}
er := fmt.Errorf("jetstreamConsume: will consume the following subjects: %v", filterSubjectValues)
s.errorKernel.errSend(s.processInitial, Message{}, er, logInfo)
cons, err := stream.CreateOrUpdateConsumer(s.ctx, jetstream.ConsumerConfig{
Name: s.nodeName,
Durable: s.nodeName,
FilterSubjects: filterSubjectValues,
})
if err != nil {
log.Fatalf("error: jetstreamConsume: CreateOrUpdateConsumer failed: %v\n", err)
}
consumeContext, _ := cons.Consume(func(msg jetstream.Msg) {
er := fmt.Errorf("jetstreamConsume: jetstream msg received: subject %q, data: %q", msg.Subject(), string(msg.Data()))
s.errorKernel.errSend(s.processInitial, Message{}, er, logInfo)
msg.Ack()
m, err := s.messageDeserializeAndUncompress(msg.Data())
if err != nil {
er := fmt.Errorf("jetstreamConsume: deserialize and uncompress failed: %v", err)
s.errorKernel.errSend(s.processInitial, Message{}, er, logError)
return
}
// From here it is the normal message logic that applies, and since messages received
// via jetstream are to be handled by the node it was consumed we set the current
// nodeName of the consumer in the ctrl Message, so we are sure it is handled locally.
m.ToNode = Node(s.nodeName)
sam, err := newSubjectAndMessage(m)
if err != nil {
er := fmt.Errorf("error: jetstreamConsume: newSubjectAndMessage failed: %v", err)
s.errorKernel.errSend(s.processInitial, Message{}, er, logError)
return
}
// If a message is received via
s.samSendLocalCh <- []subjectAndMessage{sam}
})
defer consumeContext.Stop()
<-s.ctx.Done()
}
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// getFilePaths will get the names of all the messages in
// the folder specified from current working directory.
func (s *server) getFilePaths(dirName string) ([]string, error) {
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dirPath, err := os.Executable()
dirPath = filepath.Dir(dirPath)
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if err != nil {
return nil, fmt.Errorf("error: startup folder: unable to get the working directory %v: %v", dirPath, err)
}
dirPath = filepath.Join(dirPath, dirName)
// Check if the startup folder exist.
if _, err := os.Stat(dirPath); os.IsNotExist(err) {
err := os.MkdirAll(dirPath, 0770)
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if err != nil {
er := fmt.Errorf("error: failed to create startup folder: %v", err)
return nil, er
}
}
fInfo, err := os.ReadDir(dirPath)
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if err != nil {
er := fmt.Errorf("error: failed to get filenames in startup folder: %v", err)
return nil, er
}
filePaths := []string{}
for _, v := range fInfo {
realpath := filepath.Join(dirPath, v.Name())
filePaths = append(filePaths, realpath)
}
return filePaths, nil
}
// readSocket will read the .sock file specified.
// It will take a channel of []byte as input, and it is in this
// channel the content of a file that has changed is returned.
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func (s *server) readSocket() {
// Loop, and wait for new connections.
for {
conn, err := s.ctrlSocket.Accept()
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if err != nil {
er := fmt.Errorf("error: failed to accept conn on socket: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logError)
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}
go func(conn net.Conn) {
defer conn.Close()
var readBytes []byte
for {
b := make([]byte, 1500)
_, err = conn.Read(b)
if err != nil && err != io.EOF {
er := fmt.Errorf("error: failed to read data from socket: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
return
}
readBytes = append(readBytes, b...)
if err == io.EOF {
break
}
}
readBytes = bytes.Trim(readBytes, "\x00")
// unmarshal the JSON into a struct
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sams, err := s.convertBytesToSAMs(readBytes)
if err != nil {
er := fmt.Errorf("error: malformed json received on socket: %s\n %v", readBytes, err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
return
}
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for i := range sams {
// Fill in the value for the FromNode field, so the receiver
// can check this field to know where it came from.
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sams[i].Message.FromNode = Node(s.nodeName)
// Send an info message to the central about the message picked
// for auditing.
er := fmt.Errorf("info: message read from socket on %v: %v", s.nodeName, sams[i].Message)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logInfo)
s.newMessagesCh <- sams[i]
}
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// Send the SAM struct to be picked up by the ring buffer.
s.auditLogCh <- sams
}(conn)
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}
}
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// readFolder
func (s *server) readFolder() {
// Check if the startup folder exist.
if _, err := os.Stat(s.configuration.ReadFolder); os.IsNotExist(err) {
err := os.MkdirAll(s.configuration.ReadFolder, 0770)
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if err != nil {
er := fmt.Errorf("error: failed to create readfolder folder: %v", err)
s.errorKernel.logError(er)
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os.Exit(1)
}
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
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er := fmt.Errorf("main: failed to create new logWatcher: %v", err)
s.errorKernel.logError(er)
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os.Exit(1)
}
// Start listening for events.
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Op == fsnotify.Create || event.Op == fsnotify.Write {
time.Sleep(time.Millisecond * 250)
er := fmt.Errorf("readFolder: got file event, name: %v, op: %v", event.Name, event.Op)
s.errorKernel.logDebug(er)
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func() {
fh, err := os.Open(event.Name)
if err != nil {
er := fmt.Errorf("error: readFolder: failed to open readFile from readFolder: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
return
}
b, err := io.ReadAll(fh)
if err != nil {
er := fmt.Errorf("error: readFolder: failed to readall from readFolder: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
fh.Close()
return
}
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fh.Close()
fmt.Printf("------- DEBUG: %v\n", b)
b = bytes.Trim(b, "\x00")
// unmarshal the JSON into a struct
sams, err := s.convertBytesToSAMs(b)
if err != nil {
er := fmt.Errorf("error: readFolder: malformed json received: %s\n %v", b, err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
return
}
for i := range sams {
// Fill in the value for the FromNode field, so the receiver
// can check this field to know where it came from.
sams[i].Message.FromNode = Node(s.nodeName)
// Send an info message to the central about the message picked
// for auditing.
er := fmt.Errorf("info: readFolder: message read from readFolder on %v: %v", s.nodeName, sams[i].Message)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
// Check if it is a message to publish with Jetstream.
if sams[i].Message.JetstreamToNode != "" {
s.jetstreamPublishCh <- sams[i].Message
er = fmt.Errorf("readFolder: read new JETSTREAM message in readfolder and putting it on s.jetstreamPublishCh: %#v", sams)
s.errorKernel.logDebug(er)
continue
}
s.newMessagesCh <- sams[i]
er = fmt.Errorf("readFolder: read new message in readfolder and putting it on s.samToSendCh: %#v", sams)
s.errorKernel.logDebug(er)
}
// Send the SAM struct to be picked up by the ring buffer.
s.auditLogCh <- sams
// Delete the file.
err = os.Remove(event.Name)
if err != nil {
er := fmt.Errorf("error: readFolder: failed to remove readFile from readFolder: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
return
}
}()
}
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case err, ok := <-watcher.Errors:
if !ok {
return
}
er := fmt.Errorf("error: readFolder: file watcher error: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
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}
}
}()
// Add a path.
err = watcher.Add(s.configuration.ReadFolder)
if err != nil {
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er := fmt.Errorf("startLogsWatcher: failed to add watcher: %v", err)
s.errorKernel.logError(er)
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os.Exit(1)
}
}
// readTCPListener wait and read messages delivered on the TCP
// port if started.
// It will take a channel of []byte as input, and it is in this
// channel the content of a file that has changed is returned.
func (s *server) readTCPListener() {
ln, err := net.Listen("tcp", s.configuration.TCPListener)
if err != nil {
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er := fmt.Errorf("error: readTCPListener: failed to start tcp listener: %v", err)
s.errorKernel.logError(er)
os.Exit(1)
}
// Loop, and wait for new connections.
for {
conn, err := ln.Accept()
if err != nil {
er := fmt.Errorf("error: failed to accept conn on socket: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logError)
continue
}
go func(conn net.Conn) {
defer conn.Close()
var readBytes []byte
for {
b := make([]byte, 1500)
_, err = conn.Read(b)
if err != nil && err != io.EOF {
er := fmt.Errorf("error: failed to read data from tcp listener: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
return
}
readBytes = append(readBytes, b...)
if err == io.EOF {
break
}
}
readBytes = bytes.Trim(readBytes, "\x00")
// unmarshal the JSON into a struct
sams, err := s.convertBytesToSAMs(readBytes)
if err != nil {
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er := fmt.Errorf("error: malformed json received on tcp listener: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
return
}
for i := range sams {
// Fill in the value for the FromNode field, so the receiver
// can check this field to know where it came from.
sams[i].Message.FromNode = Node(s.nodeName)
s.newMessagesCh <- sams[i]
}
// Send the SAM struct to be picked up by the ring buffer.
s.auditLogCh <- sams
}(conn)
}
}
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func (s *server) readHTTPlistenerHandler(w http.ResponseWriter, r *http.Request) {
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var readBytes []byte
for {
b := make([]byte, 1500)
_, err := r.Body.Read(b)
if err != nil && err != io.EOF {
er := fmt.Errorf("error: failed to read data from tcp listener: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
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return
}
readBytes = append(readBytes, b...)
if err == io.EOF {
break
}
}
readBytes = bytes.Trim(readBytes, "\x00")
// unmarshal the JSON into a struct
sams, err := s.convertBytesToSAMs(readBytes)
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if err != nil {
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er := fmt.Errorf("error: malformed json received on HTTPListener: %v", err)
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s.errorKernel.errSend(s.processInitial, Message{}, er, logWarning)
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return
}
for i := range sams {
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// Fill in the value for the FromNode field, so the receiver
// can check this field to know where it came from.
sams[i].Message.FromNode = Node(s.nodeName)
s.newMessagesCh <- sams[i]
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}
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// Send the SAM struct to be picked up by the ring buffer.
s.auditLogCh <- sams
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}
func (s *server) readHttpListener() {
go func() {
n, err := net.Listen("tcp", s.configuration.HTTPListener)
if err != nil {
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er := fmt.Errorf("error: startMetrics: failed to open prometheus listen port: %v", err)
s.errorKernel.logError(er)
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os.Exit(1)
}
mux := http.NewServeMux()
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mux.HandleFunc("/", s.readHTTPlistenerHandler)
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err = http.Serve(n, mux)
if err != nil {
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er := fmt.Errorf("error: startMetrics: failed to start http.Serve: %v", err)
s.errorKernel.logError(er)
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os.Exit(1)
}
}()
}
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// The subject are made up of different parts of the message field.
// To make things easier and to avoid figuring out what the subject
// is in all places we've created the concept of subjectAndMessage
// (sam) where we get the subject for the message once, and use the
// sam structure with subject alongside the message instead.
type subjectAndMessage struct {
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Subject `json:"subject" yaml:"subject"`
Message `json:"message" yaml:"message"`
}
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// convertBytesToSAMs will range over the byte representing a message given in
// json format. For each element found the Message type will be converted into
// a SubjectAndMessage type value and appended to a slice, and the slice is
// returned to the caller.
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func (s *server) convertBytesToSAMs(b []byte) ([]subjectAndMessage, error) {
MsgSlice := []Message{}
err := yaml.Unmarshal(b, &MsgSlice)
if err != nil {
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return nil, fmt.Errorf("error: unmarshal of file failed: %#v", err)
}
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// Check for toNode and toNodes field.
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MsgSlice = s.checkMessageToNodes(MsgSlice)
s.metrics.promUserMessagesTotal.Add(float64(len(MsgSlice)))
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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 {
er := fmt.Errorf("error: newSubjectAndMessage: %v", err)
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s.errorKernel.errSend(s.processInitial, m, er, logWarning)
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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{}
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for _, v := range MsgSlice {
switch {
// if toNode specified, we don't care about the toHosts.
case v.ToNode != "":
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msgs = append(msgs, v)
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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
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// 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.
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m.ToNodes = nil
m.ToNode = n
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msgs = append(msgs, m)
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}
continue
// No toNode or toNodes specified. Drop the message by not appending it to
// the slice since it is not valid.
default:
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er := fmt.Errorf("error: no toNode or toNodes where specified in the message, dropping message: %v", v)
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s.errorKernel.errSend(s.processInitial, v, er, logWarning)
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continue
}
}
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return msgs
}
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// newSubjectAndMessage will look up the correct values and value types to
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// be used in a subject for a Message (sam), and return the a combined structure
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// of type subjectAndMessage.
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func newSubjectAndMessage(m Message) (subjectAndMessage, error) {
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// We need to create a tempory method type to look up the kind for the
// real method for the message.
var mt Method
tmpH := mt.getHandler(m.Method)
if tmpH == nil {
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)
}
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sub := Subject{
ToNode: string(m.ToNode),
Method: m.Method,
messageCh: make(chan Message),
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}
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sam := subjectAndMessage{
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Subject: sub,
Message: m,
}
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return sam, nil
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}