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@ -3,23 +3,14 @@ package main
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import (
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"bufio"
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"database/sql"
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"fmt"
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"net/url"
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"os"
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"strings"
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"time"
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"git.kiefte.eu/lapingvino/infodump/message"
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shell "github.com/ipfs/go-ipfs-api"
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_ "modernc.org/sqlite"
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)
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var LocalMessages = message.Messages{}
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var DatabasePath = "infodump.db"
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var DB *sql.DB
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var MessageCache string
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// Readline reads from a buffered stdin and returns the line
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func Readline() string {
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reader := bufio.NewReader(os.Stdin)
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@ -112,367 +103,3 @@ func SettingsMenu() {
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{"Back", func() {}},
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})
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}
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// A menu for the several parts of Sync:
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// saving messages to the local database
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// reading messages from the local database
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// reading messages from the network
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// writing messages to the network
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func SyncMenu() {
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// Present the user with a menu
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Menu([]MenuElements{
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{"Save Messages to Database", SaveMessagesToDatabase},
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{"Read Messages from Database", ReadMessagesFromDatabase},
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{"Read Messages from Network", ReadMessagesFromNetwork},
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{"Write Messages to Network", WriteMessagesToNetwork},
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{"Back", func() {}},
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})
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}
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// StartOLNListener starts a PubSub listener that listens for messages from the network
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// and adds them to LocalMessages
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// For this it uses the IPFS gateway and listens on the topic "OLN", as well as
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// the list of followed tags from the database
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func StartOLNListener() {
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// Get the IPFS gateway
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gateway := message.IPFSGateway
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// Get the database
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db := GetDatabase()
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// Get the list of followed tags
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followedTags := GetFollowedTags(db)
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// Create a new IPFS client
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myIPFS := shell.NewShell(gateway)
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var subs []*shell.PubSubSubscription
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olnsub, err := myIPFS.PubSubSubscribe("OLN")
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if err != nil {
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fmt.Println(err)
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return
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}
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subs = append(subs, olnsub)
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for _, tag := range followedTags {
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tagssub, err := myIPFS.PubSubSubscribe("oln-" + tag)
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if err != nil {
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fmt.Println(err)
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} else {
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subs = append(subs, tagssub)
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}
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}
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// Start a goroutine for each of the subscriptions in subs,
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// read the CID from the Next method, look up the CID on IPFS,
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// read this in via message.MessagesFromIPFS and add the message to LocalMessages
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for _, sub := range subs {
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go func(sub *shell.PubSubSubscription) {
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for {
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msg, err := sub.Next()
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if err != nil {
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fmt.Println(err)
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return
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}
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msgs, err := message.MessagesFromIPFS(string(msg.Data))
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if err != nil {
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fmt.Println(err)
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return
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}
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LocalMessages.AddMany(msgs)
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}
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}(sub)
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}
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}
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// GetDatabase checks if DB is already set and opened, if not it Sets the database first
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func GetDatabase() *sql.DB {
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if DB == nil {
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fmt.Println("Database not set, setting database...")
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SetDatabase()
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}
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return DB
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}
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func GetMessagesFromDatabase(db *sql.DB) *message.Messages {
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// Get all messages from the database
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rows, err := db.Query("SELECT hash, message, nonce, timestamp FROM messages")
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if err != nil {
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fmt.Println(err)
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}
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defer rows.Close()
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// Create a new Messages object
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msgs := message.Messages{}
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// Loop through all messages
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fmt.Println("Getting messages from database...")
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for rows.Next() {
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var hash, msg string
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var nonce int
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var timestamp int64
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// Get the values from the database
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err := rows.Scan(&hash, &msg, &nonce, ×tamp)
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if err != nil {
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fmt.Println(err)
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}
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fmt.Println("Got message from database:", hash)
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// Create a new message object
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m := message.Message{
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Message: msg,
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Nonce: nonce,
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Timestamp: timestamp,
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}
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// Add the message to the Messages object
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fmt.Println("Adding message to Messages object...")
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msgs.Add(&m)
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}
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return &msgs
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}
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// ReadMessages shows the messages in LocalMessages sorted by importance, 10 at a time
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func ReadMessages() {
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// Use LocalMessages to get the messages and get the sorted list of messages
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// through the MessageList method
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msgs := LocalMessages.MessageList()
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// Loop through the messages and print them
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for i, m := range msgs {
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fmt.Println(m)
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if i%10 == 9 {
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fmt.Println("Press enter to continue... Type anything to stop")
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contp := Readline()
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if contp != "" {
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return
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}
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}
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}
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}
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func WriteMessage() {
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// Get a message and an urgency from the user.
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// The urgency is used to set the strength of the Proof of Work
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// If there is a message in the MessageCache, ask the user if they want to use it
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// If there is no message in the MessageCache, ask the user to write a message
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var m string
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if MessageCache != "" {
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fmt.Println("You wrote a message before that you didn't send yet. Do you want to use that message?")
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fmt.Println("The message is:", MessageCache)
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fmt.Println("Type 'yes' to use the message, or anything else to write a new message")
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usep := Readline()
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if usep == "yes" {
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fmt.Println("Using message from cache")
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m = MessageCache
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} else {
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fmt.Println("Writing new message")
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m = usep
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}
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} else {
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fmt.Println("Write a message:")
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m = Readline()
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}
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fmt.Println("Enter an urgency (higher is stronger but takes longer to produce): ")
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var urgency int
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fmt.Scanln(&urgency)
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fmt.Println("How many seconds should we wait for the POW to be done? (default is 5): ")
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var powtime int
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fmt.Scanln(&powtime)
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if powtime == 0 {
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powtime = 5
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}
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// Create a new message object
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msg, err := message.New(m, urgency, time.Now().Unix(), time.Duration(powtime)*time.Second)
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if err != nil {
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fmt.Println(err)
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fmt.Println("Want to try again with another urgency or timeout? (y/n)")
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contp := Readline()
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if contp == "y" {
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MessageCache = m
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WriteMessage()
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}
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return
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}
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// MessageCache can be discarded after this point
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MessageCache = ""
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// Add the message to LocalMessages
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LocalMessages.Add(msg)
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// Ask if the user wants to write another message or save the messages to the database
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fmt.Println("Do you want to write another message? (y/n)")
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contp := Readline()
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if contp == "y" {
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WriteMessage()
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} else {
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fmt.Println("Do you want to save the messages to the database? (y/n)")
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contp := Readline()
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if contp == "y" {
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SaveMessagesToDatabase()
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}
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}
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}
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// Implementing the Sync Menu options
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// SaveMessagesToDatabase, ReadMessagesFromDatabase, ReadMessagesFromNetwork and WriteMessagesToNetwork
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// SaveMessagesToDatabase saves the messages in LocalMessages to the database
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func SaveMessagesToDatabase() {
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// Update the database with the messages in LocalMessages
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db := GetDatabase()
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// Put the messages in the database
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LocalMessages.Each(func(m *message.Message) {
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_, err := db.Exec("INSERT INTO messages(hash, message, nonce, timestamp) VALUES(?,?,?,?)", m.Stamp(), m.Message, m.Nonce, m.Timestamp)
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if err != nil {
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fmt.Println(err)
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} else {
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fmt.Println("Message", m.Stamp(), "saved to database")
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}
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})
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}
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// ReadMessagesFromDatabase reads the messages from the database and adds them to LocalMessages
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func ReadMessagesFromDatabase() {
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// Get the messages from the database
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messages := GetMessagesFromDatabase(GetDatabase())
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// Add the messages to LocalMessages
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LocalMessages.AddMany(messages)
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}
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// ReadMessagesFromNetwork reads the messages from the IPFS network and adds them to LocalMessages
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func ReadMessagesFromNetwork() {
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// Get the messages from the IPFS network
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// TODO: Implement this
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}
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// WriteMessagesToNetwork writes the messages in LocalMessages to the IPFS network
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func WriteMessagesToNetwork() {
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// Add the messages to the IPFS network
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cid, err := LocalMessages.AddToIPFS()
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if err != nil {
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fmt.Println(err)
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} else {
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fmt.Println("Messages synced to IPFS: ", cid)
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}
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}
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func TestIPFSGateway(gateway string) error {
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// Test the IPFS gateway
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fmt.Println("Testing IPFS gateway...")
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ipfs := shell.NewShell(gateway)
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_, err := ipfs.ID()
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return err
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}
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func SetIPFSGateway() {
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// Set the IPFS gateway
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fmt.Println("Enter the IPFS gateway: ")
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var gateway string
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fmt.Scanln(&gateway)
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// Test the IPFS gateway
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err := TestIPFSGateway(gateway)
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if err != nil {
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fmt.Println(err)
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return
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} else {
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fmt.Println("IPFS gateway set to: ", gateway)
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message.IPFSGateway = gateway
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}
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}
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func InitDatabase(db *sql.DB) {
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var err error
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// Create the table "messages"
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_, err = db.Exec("CREATE TABLE messages(hash TEXT PRIMARY KEY, message TEXT, nonce INTEGER, timestamp INTEGER)")
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if err != nil {
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fmt.Println(err)
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}
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// Create the table "followed_tags"
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_, err = db.Exec("CREATE TABLE followed_tags(tag TEXT)")
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if err != nil {
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fmt.Println(err)
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}
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}
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// SetDatabase configures DB to be the database to use
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// The name used is DatabasePath, but the user will be asked if this correct or if they want to change it
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// If the database is already set, it will ask the user if they want to overwrite it
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// If the database is not set, it will ask the user if they want to create it
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// If the database is set but it doesn't contain the tables "messages" and "followed_tags",
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// it will create them
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func SetDatabase() {
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// First check if the user is okay with the database path
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fmt.Println("Database path: ", DatabasePath)
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fmt.Println("Is this correct? (y/n)")
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answer := Readline()
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if answer == "n" {
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fmt.Println("Enter the database path: ")
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DatabasePath = Readline()
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}
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// Open the database
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db, err := sql.Open("sqlite", DatabasePath)
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if err != nil {
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fmt.Println(err)
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return
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}
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// Check if the database is already set
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if DB != nil {
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fmt.Println("Database already set, overwrite? (y/n)")
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answer := Readline()
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if answer == "n" {
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return
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}
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}
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// Check if the database exists
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if _, err := os.Stat(DatabasePath); os.IsNotExist(err) {
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fmt.Println("Database does not exist, create? (y/n)")
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answer := Readline()
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if answer == "n" {
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return
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}
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}
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// Set the database
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DB = db
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// Check if the database contains the tables "messages" and "followed_tags"
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// If not, create them
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InitDatabase(DB)
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}
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func ConfigureFollowedTags() {
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db := GetDatabase()
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fmt.Println("At the moment you follow the following tags:")
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|
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// Get the tags that the user is following
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tags := GetFollowedTags(db)
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// Show the tags
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for _, tag := range tags {
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fmt.Print(tag, " ")
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}
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fmt.Println()
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|
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fmt.Println("Enter the tags you want to follow, separated by spaces\nTo remove tags, prefix them with a minus sign: ")
|
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|
|
newtags := Readline()
|
|
|
|
|
// Split the tags into an array and insert them into database DB
|
|
|
|
|
// using table "followed_tags"
|
|
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|
|
tagArray := strings.Split(newtags, " ")
|
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|
|
for _, tag := range tagArray {
|
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|
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tag = strings.Trim(tag, " \n")
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|
|
if !strings.HasPrefix(tag, "-") {
|
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|
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_, err := db.Exec("INSERT INTO followed_tags(tag) VALUES(?)", tag)
|
|
|
|
|
if err != nil {
|
|
|
|
|
fmt.Println(err)
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
_, err := db.Exec("DELETE FROM followed_tags WHERE tag=?", tag[1:])
|
|
|
|
|
if err != nil {
|
|
|
|
|
fmt.Println(err)
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func GetFollowedTags(db *sql.DB) []string {
|
|
|
|
|
// Get the tags from the database
|
|
|
|
|
rows, err := db.Query("SELECT tag FROM followed_tags")
|
|
|
|
|
if err != nil {
|
|
|
|
|
fmt.Println(err)
|
|
|
|
|
}
|
|
|
|
|
var tags []string
|
|
|
|
|
for rows.Next() {
|
|
|
|
|
var tag string
|
|
|
|
|
err = rows.Scan(&tag)
|
|
|
|
|
if err != nil {
|
|
|
|
|
fmt.Println(err)
|
|
|
|
|
}
|
|
|
|
|
tags = append(tags, tag)
|
|
|
|
|
}
|
|
|
|
|
return tags
|
|
|
|
|
}
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