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Merge pull request #14 from hobbyistlabs-coder/bolt-perf-discord-string-builder-16389558094904414313

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⚡ Bolt: Optimize string building in Discord channel
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hobbyistlabs-coder 2026-03-13 16:30:39 -04:00 • committed by GitHub
commit a04e19bc03
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GPG key ID: B5690EEEBB952194
2 changed files with 29 additions and 6 deletions
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5
.jules/bolt.md
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@ -1,3 +1,6 @@
## 2024-05-24 - Single Pass String Iteration for Token Estimation
**Learning:** `utf8.RuneCountInString(msg)` performs a full iteration over the string. If the string needs to be iterated over again (e.g., `for _, r := range msg`) to check specific rune properties, this results in two full passes over the string.
**Action:** Always count the total number of runes manually within the existing `for range` loop when a subsequent full iteration of the string is already required. This essentially halves the execution time.
**Action:** Always count the total number of runes manually within the existing `for range` loop when a subsequent full iteration of the string is already required. This essentially halves the execution time.
## 2024-05-25 - Efficient String Building in Loops
**Learning:** In Go, string concatenation (`+=`) in a loop leads to $O(N^2)$ complexity due to immutability. Using `strings.Builder` provides $O(N)$ efficiency. Additionally, `fmt.Fprintf` has overhead due to format string parsing; direct `sb.WriteString` calls are significantly faster.
**Action:** Use `strings.Builder` for building strings in loops and prefer direct `WriteString` calls over `fmt.Fprintf` for maximum performance in hot paths.

30
pkg/channels/discord/discord.go
View file

@ -406,6 +406,8 @@ func (c *DiscordChannel) handleMessage(s *discordgo.Session, m *discordgo.Messag
return localPath // fallback
}
var contentBuilder strings.Builder
contentBuilder.WriteString(content)
for _, attachment := range m.Attachments {
isAudio := utils.IsAudioFile(attachment.Filename, attachment.ContentType)
@ -413,21 +415,36 @@ func (c *DiscordChannel) handleMessage(s *discordgo.Session, m *discordgo.Messag
localPath := c.downloadAttachment(attachment.URL, attachment.Filename)
if localPath != "" {
mediaPaths = append(mediaPaths, storeMedia(localPath, attachment.Filename))
content = appendContent(content, fmt.Sprintf("[audio: %s]", attachment.Filename))
if contentBuilder.Len() > 0 {
contentBuilder.WriteByte('\n')
}
contentBuilder.WriteString("[audio: ")
contentBuilder.WriteString(attachment.Filename)
contentBuilder.WriteByte(']')
} else {
logger.WarnCF("discord", "Failed to download audio attachment", map[string]any{
"url": attachment.URL,
"filename": attachment.Filename,
})
mediaPaths = append(mediaPaths, attachment.URL)
content = appendContent(content, fmt.Sprintf("[attachment: %s]", attachment.URL))
if contentBuilder.Len() > 0 {
contentBuilder.WriteByte('\n')
}
contentBuilder.WriteString("[attachment: ")
contentBuilder.WriteString(attachment.URL)
contentBuilder.WriteByte(']')
}
} else {
mediaPaths = append(mediaPaths, attachment.URL)
content = appendContent(content, fmt.Sprintf("[attachment: %s]", attachment.URL))
if contentBuilder.Len() > 0 {
contentBuilder.WriteByte('\n')
}
contentBuilder.WriteString("[attachment: ")
contentBuilder.WriteString(attachment.URL)
contentBuilder.WriteByte(']')
}
}
content = contentBuilder.String()
if content == "" && len(mediaPaths) == 0 {
return
}
@ -600,7 +617,10 @@ func (c *DiscordChannel) resolveDiscordRefs(s *discordgo.Session, text string, g
if msg.Author != nil {
author = msg.Author.Username
}
fmt.Fprintf(&sb, "\n[linked message from %s]: %s", author, msg.Content)
sb.WriteString("\n[linked message from ")
sb.WriteString(author)
sb.WriteString("]: ")
sb.WriteString(msg.Content)
}
return sb.String()