mirror of
https://github.com/nbd-wtf/go-nostr.git
synced 2025-03-29 11:12:04 +01:00
porting nson from nostr-benchmarks codebase.
This commit is contained in:
fiatjaf
parent
16580f3e84
commit
f55bb2f07b
218
nson/nson.go
Normal file
218
nson/nson.go
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@ -0,0 +1,218 @@
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package nson
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import (
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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"github.com/nbd-wtf/go-nostr"
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)
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/*
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nson size
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kind chars
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content chars
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number of tags (let's say it's two)
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number of items on the first tag (let's say it's three)
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number of chars on the first item
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number of chars on the second item
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number of chars on the third item
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number of items on the second tag (let's say it's two)
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number of chars on the first item
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number of chars on the second item
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"nson":"xxkkccccttnn111122223333nn11112222"
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*/
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// Unmarshal turns a NSON string into a nostr.Event struct
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func Unmarshal(data string) (evt *nostr.Event, err error) {
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defer func() {
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if r := recover(); r != nil {
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err = fmt.Errorf("failed to decode nson: %v", r)
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}
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}()
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// check if it's nson
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if data[311:315] != "nson" {
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return nil, fmt.Errorf("not nson")
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}
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// nson values
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nsonSizeBytes, _ := hex.DecodeString(data[318 : 318+2])
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nsonSize := int(nsonSizeBytes[0]) * 2 // number of bytes is given, we x2 because the string is in hex
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nsonDescriptors, _ := hex.DecodeString(data[320 : 320+nsonSize])
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evt = &nostr.Event{}
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// static fields
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evt.ID = data[7 : 7+64]
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evt.PubKey = data[83 : 83+64]
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evt.Sig = data[156 : 156+128]
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ts, _ := strconv.ParseInt(data[299:299+10], 10, 64)
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evt.CreatedAt = nostr.Timestamp(ts)
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// dynamic fields
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// kind
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kindChars := int(nsonDescriptors[0])
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kindStart := 320 + nsonSize + 9 // len(`","kind":`)
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evt.Kind, _ = strconv.Atoi(data[kindStart : kindStart+kindChars])
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// content
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contentChars := int(binary.BigEndian.Uint16(nsonDescriptors[1:3]))
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contentStart := kindStart + kindChars + 12 // len(`,"content":"`)
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evt.Content, _ = strconv.Unquote(data[contentStart-1 : contentStart+contentChars+1])
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// tags
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nTags := int(nsonDescriptors[3])
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evt.Tags = make(nostr.Tags, nTags)
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tagsStart := contentStart + contentChars + 9 // len(`","tags":`)
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nsonIndex := 3
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tagsIndex := tagsStart
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for t := 0; t < nTags; t++ {
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nsonIndex++
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tagsIndex += 1 // len(`[`) or len(`,`)
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nItems := int(nsonDescriptors[nsonIndex])
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tag := make(nostr.Tag, nItems)
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for n := 0; n < nItems; n++ {
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nsonIndex++
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itemStart := tagsIndex + 2 // len(`["`) or len(`,"`)
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itemChars := int(binary.BigEndian.Uint16(nsonDescriptors[nsonIndex:]))
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nsonIndex++
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tag[n], _ = strconv.Unquote(data[itemStart-1 : itemStart+itemChars+1])
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tagsIndex = itemStart + itemChars + 1 // len(`"`)
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}
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tagsIndex += 1 // len(`]`)
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evt.Tags[t] = tag
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}
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return evt, err
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}
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func Marshal(evt *nostr.Event) (string, error) {
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// start building the nson descriptors (without the first byte that represents the nson size)
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nsonBuf := make([]byte, 256)
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// build the tags
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nTags := len(evt.Tags)
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nsonBuf[3] = uint8(nTags)
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nsonIndex := 3 // start here
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tagBuilder := strings.Builder{}
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tagBuilder.Grow(1000) // a guess
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tagBuilder.WriteString(`[`)
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for t, tag := range evt.Tags {
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nItems := len(tag)
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nsonIndex++
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nsonBuf[nsonIndex] = uint8(nItems)
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tagBuilder.WriteString(`[`)
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for i, item := range tag {
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v := strconv.Quote(item)
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nsonIndex++
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binary.BigEndian.PutUint16(nsonBuf[nsonIndex:], uint16(len(v)-2))
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nsonIndex++
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tagBuilder.WriteString(v)
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if nItems > i+1 {
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tagBuilder.WriteString(`,`)
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}
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}
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tagBuilder.WriteString(`]`)
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if nTags > t+1 {
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tagBuilder.WriteString(`,`)
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}
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}
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tagBuilder.WriteString(`]}`)
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nsonBuf = nsonBuf[0 : nsonIndex+1]
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kind := strconv.Itoa(evt.Kind)
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kindChars := len(kind)
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nsonBuf[0] = uint8(kindChars)
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content := strconv.Quote(evt.Content)
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contentChars := len(content) - 2
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binary.BigEndian.PutUint16(nsonBuf[1:3], uint16(contentChars))
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// actually build the json
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base := strings.Builder{}
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base.Grow(320 + // everything up to "nson":
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2 + len(nsonBuf)*2 + // nson
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9 + kindChars + // kind and its label
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12 + contentChars + // content and its label
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9 + tagBuilder.Len() + // tags and its label
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2, // the end
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)
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base.WriteString(`{"id":"` + evt.ID + `","pubkey":"` + evt.PubKey + `","sig":"` + evt.Sig + `","created_at":` + strconv.FormatInt(int64(evt.CreatedAt), 10) + `,"nson":"`)
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nsonSizeBytes := len(nsonBuf)
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if nsonSizeBytes > 255 {
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return "", fmt.Errorf("can't encode to nson, there are too many tags or tag items")
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}
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base.WriteString(hex.EncodeToString([]byte{uint8(nsonSizeBytes)})) // nson size (bytes)
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base.WriteString(hex.EncodeToString(nsonBuf)) // nson descriptors
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base.WriteString(`","kind":` + kind + `,"content":` + content + `,"tags":`)
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base.WriteString(tagBuilder.String() /* includes the end */)
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return base.String(), nil
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}
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// A nson.Event is basically a wrapper over the string that makes it easy to get each event property (except tags).
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type Event struct {
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data string
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descriptorsSize int
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descriptors []byte
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}
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func New(nsonText string) Event {
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return Event{data: nsonText}
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}
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func (ne *Event) parseDescriptors() {
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if ne.descriptors == nil {
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nsonSizeBytes, _ := hex.DecodeString(ne.data[318 : 318+2])
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ne.descriptorsSize = int(nsonSizeBytes[0])
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ne.descriptors, _ = hex.DecodeString(ne.data[320 : 320+ne.descriptorsSize])
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}
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}
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func (ne *Event) parseKind() {
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if ne.descriptors == nil {
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nsonSizeBytes, _ := hex.DecodeString(ne.data[318 : 318+2])
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ne.descriptorsSize = int(nsonSizeBytes[0])
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ne.descriptors, _ = hex.DecodeString(ne.data[320 : 320+ne.descriptorsSize])
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}
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}
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func (ne Event) GetID() string { return ne.data[7 : 7+64] }
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func (ne Event) GetPubkey() string { return ne.data[83 : 83+64] }
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func (ne Event) GetSig() string { return ne.data[156 : 156+128] }
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func (ne Event) GetCreatedAt() nostr.Timestamp {
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ts, _ := strconv.ParseInt(ne.data[299:299+10], 10, 64)
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return nostr.Timestamp(ts)
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}
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func (ne *Event) GetKind() int {
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ne.parseDescriptors()
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kindChars := int(ne.descriptors[0])
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kindStart := 320 + ne.descriptorsSize + 9 // len(`","kind":`)
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kind, _ := strconv.Atoi(ne.data[kindStart : kindStart+kindChars])
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return kind
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}
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func (ne *Event) GetContent() string {
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ne.parseDescriptors()
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kindChars := int(ne.descriptors[0])
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kindStart := 320 + ne.descriptorsSize + 9 // len(`","kind":`)
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contentChars := int(binary.BigEndian.Uint16(ne.descriptors[1:3]))
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contentStart := kindStart + kindChars + 12 // len(`,"content":"`)
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content, _ := strconv.Unquote(`"` + ne.data[contentStart:contentStart+contentChars] + `"`)
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return content
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}
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128
nson/nson_test.go
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128
nson/nson_test.go
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@ -0,0 +1,128 @@
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package nson
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import (
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"encoding/json"
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"fmt"
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"testing"
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"github.com/nbd-wtf/go-nostr"
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)
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var nsonTestEvents = []string{
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`{"id":"ae1fc7154296569d87ca4663f6bdf448c217d1590d28c85d158557b8b43b4d69","pubkey":"79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798","sig":"94e10947814b1ebe38af42300ecd90c7642763896c4f69506ae97bfdf54eec3c0c21df96b7d95daa74ff3d414b1d758ee95fc258125deebc31df0c6ba9396a51","created_at":1683660344,"nson":"1405000b0203000100400005040001004000000014","kind":30023,"content":"hello hello","tags":[["e","b6de44a9dd47d1c000f795ea0453046914f44ba7d5e369608b04867a575ea83e","reply"],["p","c26f7b252cea77a5b94f42b1a4771021be07d4df766407e47738605f7e3ab774","","wss://relay.damus.io"]]}`,
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`{"id":"ae1fc7154296569d87ca4663f6bdf448c217d1590d28c85d158557b8b43b4d69","pubkey":"79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798","sig":"94e10947814b1ebe38af42300ecd90c7642763896c4f69506ae97bfdf54eec3c0c21df96b7d95daa74ff3d414b1d758ee95fc258125deebc31df0c6ba9396a51","created_at":1683660344,"nson":"140500100203000100400005040001004000000014","kind":30023,"content":"hello\n\"hello\"","tags":[["e","b6de44a9dd47d1c000f795ea0453046914f44ba7d5e369608b04867a575ea83e","reply"],["p","c26f7b252cea77a5b94f42b1a4771021be07d4df766407e47738605f7e3ab774","","wss://relay.damus.io"]]}`,
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`{"id":"a235323ad6ae7032667330c4d52def2d6be67a973d71f2f1784b2b5b01d57026","pubkey":"69aeace80672c08ef7729a03e597ed4e9dd5ddaa7c457349d55d12c043e8a7ab","sig":"7e5fedc3c1c16abb95d207b73a689b5f17ab039cffd0b6bea62dcbfb607a27d38c830542df5ce762685a0da4e8edd28beab0c9a8f47e3037ff6e676ea6297bfa","created_at":1680277541,"nson":"0401049600","kind":1,"content":"Hello #Plebstrs 🤙\n\nExcited to share with you the latest improvements we've designed to enhance your user experience when creating new posts on #Plebstr.\n\nMain UX improvements include:\n— The ability to mention anyone directly in your new post 🔍\n— Real-time previews of all attachments while creating your post \U0001fa7b\n— Minimizing the new post window to enable #multitasking and easy access to your draft 📝\n\nThis is the first design mockup and we can't wait to bring it to you in an upcoming updates. Our amazing developers are currently working on it, together with other small improvements. Stay tuned! 🚀👨\u200d💻\n\n*Some details may change so keep your fingers crossed 😄🤞\n\n#comingsoon #maybe #insomeshapeorform\n\nhttps://nostr.build/i/nostr.build_2b337d24f0cd19eff0678893ac93d58ee374ca8c3b9215516aa76a05856ec9c0.png\nhttps://nostr.build/i/nostr.build_f79b14687a1f6e7275192554722a85be815219573d824e381c4913715644e10d.png\nhttps://nostr.build/i/nostr.build_009fa068a32383f88e19763fa22e16142cf44166cb097293f7082e7bf4a38eed.png\nhttps://nostr.build/i/nostr.build_47ecdd4867808b3f3af2620ac4bf40aefcc9022c4ba26762567012c22d636487.png","tags":[]}}`,
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}
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func TestBasicNsonParse(t *testing.T) {
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for _, jevt := range nsonTestEvents {
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evt, _ := Unmarshal(jevt)
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checkParsedCorrectly(t, evt, jevt)
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}
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}
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func TestNsonPartialGet(t *testing.T) {
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for _, jevt := range nsonTestEvents {
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evt, _ := Unmarshal(jevt)
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wrapper := New(jevt)
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if id := wrapper.GetID(); id != evt.ID {
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t.Error("partial id wrong")
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}
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if pubkey := wrapper.GetPubkey(); pubkey != evt.PubKey {
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t.Error("partial pubkey wrong")
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}
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if sig := wrapper.GetSig(); sig != evt.Sig {
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t.Error("partial sig wrong")
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}
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if createdAt := wrapper.GetCreatedAt(); createdAt != evt.CreatedAt {
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t.Error("partial created_at wrong")
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}
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if kind := wrapper.GetKind(); kind != evt.Kind {
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t.Error("partial kind wrong")
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}
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if content := wrapper.GetContent(); content != evt.Content {
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t.Error("partial content wrong")
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}
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}
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}
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func TestEncodeNson(t *testing.T) {
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jevt := `{
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"content": "hello world",
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"created_at": 1683762317,
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"id": "57ff66490a6a2af3992accc26ae95f3f60c6e5f84ed0ddf6f59c534d3920d3d2",
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"kind": 1,
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"pubkey": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
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"sig": "504d142aed7fa7e0f6dab5bcd7eed63963b0277a8e11bbcb03b94531beb4b95a12f1438668b02746bd5362161bc782068e6b71494060975414e793f9e19f57ea",
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"tags": [
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[
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"e",
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"b6de44a9dd47d1c000f795ea0453046914f44ba7d5e369608b04867a575ea83e",
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"reply"
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],
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[
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"p",
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"c26f7b252cea77a5b94f42b1a4771021be07d4df766407e47738605f7e3ab774",
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"",
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"wss://relay.damus.io"
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]
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]
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}`
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evt := &nostr.Event{}
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json.Unmarshal([]byte(jevt), evt)
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nevt, _ := Marshal(evt)
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fmt.Println(nevt)
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}
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func checkParsedCorrectly(t *testing.T, evt *nostr.Event, jevt string) (isBad bool) {
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var canonical nostr.Event
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err := json.Unmarshal([]byte(jevt), &canonical)
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fmt.Println(err)
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if evt.ID != canonical.ID {
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t.Errorf("id is wrong: %s != %s", evt.ID, canonical.ID)
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isBad = true
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}
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if evt.PubKey != canonical.PubKey {
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t.Errorf("pubkey is wrong: %s != %s", evt.PubKey, canonical.PubKey)
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isBad = true
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}
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if evt.Sig != canonical.Sig {
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t.Errorf("sig is wrong: %s != %s", evt.Sig, canonical.Sig)
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isBad = true
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}
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if evt.Content != canonical.Content {
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t.Errorf("content is wrong: %s != %s", evt.Content, canonical.Content)
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isBad = true
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}
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if evt.Kind != canonical.Kind {
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t.Errorf("kind is wrong: %d != %d", evt.Kind, canonical.Kind)
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isBad = true
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}
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if evt.CreatedAt != canonical.CreatedAt {
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t.Errorf("created_at is wrong: %v != %v", evt.CreatedAt, canonical.CreatedAt)
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isBad = true
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}
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if len(evt.Tags) != len(canonical.Tags) {
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t.Errorf("tag number is wrong: %v != %v", len(evt.Tags), len(canonical.Tags))
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isBad = true
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}
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for i := range evt.Tags {
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if len(evt.Tags[i]) != len(canonical.Tags[i]) {
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t.Errorf("tag[%d] length is wrong: `%v` != `%v`", i, len(evt.Tags[i]), len(canonical.Tags[i]))
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isBad = true
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}
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for j := range evt.Tags[i] {
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if evt.Tags[i][j] != canonical.Tags[i][j] {
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t.Errorf("tag[%d][%d] is wrong: `%s` != `%s`", i, j, evt.Tags[i][j], canonical.Tags[i][j])
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isBad = true
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}
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}
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}
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return isBad
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}
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