mirror of
https://github.com/smolgrrr/TAO.git
synced 2024-09-20 09:21:25 +00:00
226 lines
5.8 KiB
Go
226 lines
5.8 KiB
Go
package main
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import (
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"encoding/hex"
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"encoding/json"
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"errors"
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"log"
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"math/bits"
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"net/http"
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"runtime"
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"strconv"
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"time"
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"github.com/nbd-wtf/go-nostr"
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)
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var (
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ErrDifficultyTooLow = errors.New("nip13: insufficient difficulty")
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ErrGenerateTimeout = errors.New("nip13: generating proof of work took too long")
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)
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// Difficulty counts the number of leading zero bits in an event ID.
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// It returns a negative number if the event ID is malformed.
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func Difficulty(eventID string) int {
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if len(eventID) != 64 {
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return -1
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}
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var zeros int
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for i := 0; i < 64; i += 2 {
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if eventID[i:i+2] == "00" {
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zeros += 8
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continue
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}
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var b [1]byte
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if _, err := hex.Decode(b[:], []byte{eventID[i], eventID[i+1]}); err != nil {
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return -1
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}
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zeros += bits.LeadingZeros8(b[0])
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break
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}
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return zeros
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}
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// Generate performs proof of work on the specified event until either the target
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// difficulty is reached or the function runs for longer than the timeout.
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// The latter case results in ErrGenerateTimeout.
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//
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// Upon success, the returned event always contains a "nonce" tag with the target difficulty
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// commitment, and an updated event.CreatedAt.
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func Generate(event *nostr.Event, targetDifficulty int, nonceStart int, nonceStep int) (*nostr.Event, error) {
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nonce := nonceStart
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tag := nostr.Tag{"nonce", strconv.Itoa(nonceStep), strconv.Itoa(targetDifficulty)}
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event.Tags = append(event.Tags, tag)
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for {
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nonce += nonceStep
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tag[1] = strconv.Itoa(nonce)
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event.CreatedAt = nostr.Now()
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if Difficulty(event.GetID()) >= targetDifficulty {
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return event, nil
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}
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}
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}
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func generatePOW(event *nostr.Event, difficulty int, numCores int) (*nostr.Event, error) {
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resultChan := make(chan *nostr.Event)
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errorChan := make(chan error)
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for i := 0; i < numCores; i++ {
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go func(nonceStart int, nonceStep int) {
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generatedEvent, err := Generate(event, difficulty, nonceStart, nonceStep)
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if err != nil {
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errorChan <- err
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return
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}
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resultChan <- generatedEvent
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}(i, numCores)
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}
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select {
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case result := <-resultChan:
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return result, nil
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case err := <-errorChan:
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return nil, err
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}
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}
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// PowRequest struct for the POST request
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type PowRequest struct {
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ReqEvent *nostr.Event `json:"req_event"`
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Difficulty string `json:"difficulty"`
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}
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// handlePOW is the handler function for the "/powgen" endpoint
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func handlePOW(w http.ResponseWriter, r *http.Request, numCores int) {
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if r.Method != "POST" {
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http.Error(w, "Invalid request method", http.StatusMethodNotAllowed)
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return
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}
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var powReq PowRequest
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err := json.NewDecoder(r.Body).Decode(&powReq)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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difficulty, err := strconv.Atoi(powReq.Difficulty)
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if err != nil {
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// handle error
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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// Generate proof of work for the event
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generatedEvent, err := generatePOW(powReq.ReqEvent, difficulty, numCores)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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// Create a response struct
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type Response struct {
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Event *nostr.Event `json:"event"`
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}
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// Respond with the generated event and the time taken
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(Response{Event: generatedEvent})
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}
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// PowRequest struct for the POST request
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type TestRequest struct {
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Difficulty string `json:"difficulty"`
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}
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// handlePOW is the handler function for the "/powgen" endpoint
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func handleTest(w http.ResponseWriter, r *http.Request, numCores int) {
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if r.Method != "POST" {
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http.Error(w, "Invalid request method", http.StatusMethodNotAllowed)
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return
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}
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var powReq PowRequest
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err := json.NewDecoder(r.Body).Decode(&powReq)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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difficulty, err := strconv.Atoi(powReq.Difficulty)
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if err != nil {
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// handle error
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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// Start the timer
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start := time.Now()
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event := &nostr.Event{
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Kind: nostr.KindTextNote,
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Content: "It's just me mining my own business",
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PubKey: "a48380f4cfcc1ad5378294fcac36439770f9c878dd880ffa94bb74ea54a6f243",
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}
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pow, err := generatePOW(event, difficulty, numCores)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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// Calculate the duration in milliseconds
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iterations, _ := strconv.ParseFloat(pow.Tags[0][1], 64)
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timeTaken := time.Since(start).Seconds()
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hashrate := iterations / time.Since(start).Seconds()
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// Create a response struct
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type Response struct {
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TimeTaken float64 `json:"timeTaken"`
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Hashrate float64 `json:"hashrate"`
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}
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// Respond with the generated event and the time taken
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(Response{TimeTaken: timeTaken, Hashrate: hashrate})
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}
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func corsMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Set headers
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w.Header().Set("Access-Control-Allow-Origin", "*")
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w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
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w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
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// If it's a preflight request, respond with 200
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if r.Method == "OPTIONS" {
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w.WriteHeader(http.StatusOK)
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return
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}
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// Next
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next.ServeHTTP(w, r)
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})
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}
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func handlePOWWithCores(numCores int) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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handlePOW(w, r, numCores)
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}
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}
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func handleTestWithCores(numCores int) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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handleTest(w, r, numCores)
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}
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}
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func main() {
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numCores := runtime.NumCPU()
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http.Handle("/powgen", corsMiddleware(handlePOWWithCores(numCores)))
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http.Handle("/test", corsMiddleware(handleTestWithCores(numCores)))
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log.Fatal(http.ListenAndServe("0.0.0.0:8080", nil))
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}
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