File size: 5,404 Bytes
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import (
"fmt"
"charm.land/fantasy"
)
func usageIsZero(usage fantasy.Usage) bool {
return usage.InputTokens == 0 &&
usage.OutputTokens == 0 &&
usage.TotalTokens == 0 &&
usage.ReasoningTokens == 0 &&
usage.CacheCreationTokens == 0 &&
usage.CacheReadTokens == 0
}
func fallbackStepUsage(messages []fantasy.Message, step fantasy.StepResult) (fantasy.Usage, bool) {
if !usageIsZero(step.Usage) {
return step.Usage, false
}
inputTokens := estimateMessageTokens(messages)
outputTokens := estimateStepCompletionTokens(step)
if inputTokens == 0 && outputTokens == 0 {
return fantasy.Usage{}, false
}
return fantasy.Usage{
InputTokens: inputTokens,
OutputTokens: outputTokens,
TotalTokens: inputTokens + outputTokens,
}, true
}
func cloneFantasyMessages(messages []fantasy.Message) []fantasy.Message {
cloned := make([]fantasy.Message, len(messages))
for i, msg := range messages {
cloned[i] = msg
cloned[i].Content = append([]fantasy.MessagePart(nil), msg.Content...)
}
return cloned
}
func estimateMessageTokens(messages []fantasy.Message) int64 {
var tokens int64
for _, msg := range messages {
tokens += approxTokenCount(string(msg.Role))
for _, part := range msg.Content {
tokens += estimateMessagePartTokens(part)
}
}
return tokens
}
func estimateStepCompletionTokens(step fantasy.StepResult) int64 {
var tokens int64
for _, content := range step.Content {
switch c := content.(type) {
case fantasy.TextContent:
tokens += approxTokenCount(c.Text)
case *fantasy.TextContent:
tokens += approxTokenCount(c.Text)
case fantasy.ReasoningContent:
tokens += approxTokenCount(c.Text)
case *fantasy.ReasoningContent:
tokens += approxTokenCount(c.Text)
case fantasy.FileContent:
tokens += estimateGeneratedFileTokens(c)
case *fantasy.FileContent:
tokens += estimateGeneratedFileTokens(*c)
case fantasy.SourceContent:
tokens += estimateSourceTokens(c)
case *fantasy.SourceContent:
tokens += estimateSourceTokens(*c)
case fantasy.ToolCallContent:
tokens += estimateToolCallTokens(c.ToolName, c.Input)
case *fantasy.ToolCallContent:
tokens += estimateToolCallTokens(c.ToolName, c.Input)
case fantasy.ToolResultContent:
if c.ProviderExecuted {
tokens += estimateToolResultContentTokens(c.ToolCallID, c.ToolName, c.ClientMetadata, c.Result)
}
case *fantasy.ToolResultContent:
if c.ProviderExecuted {
tokens += estimateToolResultContentTokens(c.ToolCallID, c.ToolName, c.ClientMetadata, c.Result)
}
}
}
return tokens
}
func estimateMessagePartTokens(part fantasy.MessagePart) int64 {
switch p := part.(type) {
case fantasy.TextPart:
return approxTokenCount(p.Text)
case *fantasy.TextPart:
return approxTokenCount(p.Text)
case fantasy.ReasoningPart:
return approxTokenCount(p.Text)
case *fantasy.ReasoningPart:
return approxTokenCount(p.Text)
case fantasy.FilePart:
return estimateFilePartTokens(p)
case *fantasy.FilePart:
return estimateFilePartTokens(*p)
case fantasy.ToolCallPart:
return estimateToolCallTokens(p.ToolName, p.Input)
case *fantasy.ToolCallPart:
return estimateToolCallTokens(p.ToolName, p.Input)
case fantasy.ToolResultPart:
return estimateToolResultContentTokens(p.ToolCallID, "", "", p.Output)
case *fantasy.ToolResultPart:
return estimateToolResultContentTokens(p.ToolCallID, "", "", p.Output)
default:
return 0
}
}
func estimateToolCallTokens(toolName, input string) int64 {
return approxTokenCount(toolName) + approxTokenCount(input)
}
func estimateToolResultContentTokens(toolCallID, toolName, metadata string, output fantasy.ToolResultOutputContent) int64 {
tokens := approxTokenCount(toolCallID) + approxTokenCount(toolName) + approxTokenCount(metadata)
switch result := output.(type) {
case fantasy.ToolResultOutputContentText:
tokens += approxTokenCount(result.Text)
case *fantasy.ToolResultOutputContentText:
tokens += approxTokenCount(result.Text)
case fantasy.ToolResultOutputContentError:
if result.Error != nil {
tokens += approxTokenCount(result.Error.Error())
}
case *fantasy.ToolResultOutputContentError:
if result.Error != nil {
tokens += approxTokenCount(result.Error.Error())
}
case fantasy.ToolResultOutputContentMedia:
tokens += estimateMediaTokens(result.MediaType, result.Text, len(result.Data))
case *fantasy.ToolResultOutputContentMedia:
tokens += estimateMediaTokens(result.MediaType, result.Text, len(result.Data))
}
return tokens
}
func estimateFilePartTokens(file fantasy.FilePart) int64 {
return estimateMediaTokens(file.MediaType, file.Filename, len(file.Data))
}
func estimateGeneratedFileTokens(file fantasy.FileContent) int64 {
return estimateMediaTokens(file.MediaType, "", len(file.Data))
}
func estimateMediaTokens(mediaType, text string, dataBytes int) int64 {
if dataBytes == 0 {
return approxTokenCount(mediaType) + approxTokenCount(text)
}
return approxTokenCount(fmt.Sprintf("%s %s %d bytes", mediaType, text, dataBytes))
}
func estimateSourceTokens(source fantasy.SourceContent) int64 {
return approxTokenCount(string(source.SourceType)) +
approxTokenCount(source.ID) +
approxTokenCount(source.URL) +
approxTokenCount(source.Title) +
approxTokenCount(source.MediaType) +
approxTokenCount(source.Filename)
}
func approxTokenCount(s string) int64 {
if s == "" {
return 0
}
return int64((len(s) + 3) / 4)
}
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