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fix(claude): avoid reusing content_block indexes in Codex SSE #538

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a321be1
fix(claude): avoid reusing content_block indexes in codex SSE
fuguiKz Dec 14, 2025
7761566
refactor(claude): dedupe tool_use block key lookup
fuguiKz Dec 14, 2025
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200 changes: 180 additions & 20 deletions internal/translator/codex/claude/codex_claude_response.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import (
"context"
"encoding/json"
"fmt"
"sort"
"strings"

"github.com/tidwall/gjson"
Expand All @@ -21,6 +22,54 @@ var (
dataTag = []byte("data:")
)

type ConvertCodexResponseToClaudeParams struct {
HasToolCall bool
NextContentBlockIndex int

BlockIndexByKey map[string]int
StartedKeys map[string]bool
StoppedKeys map[string]bool
ToolKeyByOutputIndex map[int64]string
}

func (p *ConvertCodexResponseToClaudeParams) indexForKey(key string) int {
if idx, ok := p.BlockIndexByKey[key]; ok {
return idx
}
idx := p.NextContentBlockIndex
p.NextContentBlockIndex++
p.BlockIndexByKey[key] = idx
return idx
}

func (p *ConvertCodexResponseToClaudeParams) toolBlockKey(outputIndex int64) string {
if key := p.ToolKeyByOutputIndex[outputIndex]; key != "" {
return key
}
key := fmt.Sprintf("tool_use:%d", outputIndex)
p.ToolKeyByOutputIndex[outputIndex] = key
return key
}

func codexClaudeThinkingKey(root gjson.Result) string {
outputIndex := root.Get("output_index").Int()
if summaryIndex := root.Get("summary_index"); summaryIndex.Exists() {
return fmt.Sprintf("thinking:%d:%d", outputIndex, summaryIndex.Int())
}
if contentIndex := root.Get("content_index"); contentIndex.Exists() {
return fmt.Sprintf("thinking:%d:%d", outputIndex, contentIndex.Int())
}
return fmt.Sprintf("thinking:%d", outputIndex)
}

func codexClaudeTextKey(root gjson.Result) string {
outputIndex := root.Get("output_index").Int()
if contentIndex := root.Get("content_index"); contentIndex.Exists() {
return fmt.Sprintf("text:%d:%d", outputIndex, contentIndex.Int())
}
return fmt.Sprintf("text:%d", outputIndex)
}

// ConvertCodexResponseToClaude performs sophisticated streaming response format conversion.
// This function implements a complex state machine that translates Codex API responses
// into Claude Code-compatible Server-Sent Events (SSE) format. It manages different response types
Expand All @@ -39,9 +88,16 @@ var (
// - []string: A slice of strings, each containing a Claude Code-compatible JSON response
func ConvertCodexResponseToClaude(_ context.Context, _ string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, param *any) []string {
if *param == nil {
hasToolCall := false
*param = &hasToolCall
*param = &ConvertCodexResponseToClaudeParams{
HasToolCall: false,
NextContentBlockIndex: 0,
BlockIndexByKey: make(map[string]int),
StartedKeys: make(map[string]bool),
StoppedKeys: make(map[string]bool),
ToolKeyByOutputIndex: make(map[int64]string),
}
}
p := (*param).(*ConvertCodexResponseToClaudeParams)

// log.Debugf("rawJSON: %s", string(rawJSON))
if !bytes.HasPrefix(rawJSON, dataTag) {
Expand All @@ -62,55 +118,131 @@ func ConvertCodexResponseToClaude(_ context.Context, _ string, originalRequestRa
output = "event: message_start\n"
output += fmt.Sprintf("data: %s\n\n", template)
} else if typeStr == "response.reasoning_summary_part.added" {
blockKey := codexClaudeThinkingKey(rootResult)
index := p.indexForKey(blockKey)

template = `{"type":"content_block_start","index":0,"content_block":{"type":"thinking","thinking":""}}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)

output = "event: content_block_start\n"
output += fmt.Sprintf("data: %s\n\n", template)
p.StartedKeys[blockKey] = true
delete(p.StoppedKeys, blockKey)
} else if typeStr == "response.reasoning_summary_text.delta" {
blockKey := codexClaudeThinkingKey(rootResult)
index := p.indexForKey(blockKey)

if !p.StartedKeys[blockKey] {
startTemplate := `{"type":"content_block_start","index":0,"content_block":{"type":"thinking","thinking":""}}`
startTemplate, _ = sjson.Set(startTemplate, "index", index)

output += "event: content_block_start\n"
output += fmt.Sprintf("data: %s\n\n", startTemplate)
p.StartedKeys[blockKey] = true
delete(p.StoppedKeys, blockKey)
}

template = `{"type":"content_block_delta","index":0,"delta":{"type":"thinking_delta","thinking":""}}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)
template, _ = sjson.Set(template, "delta.thinking", rootResult.Get("delta").String())

output = "event: content_block_delta\n"
output += "event: content_block_delta\n"
output += fmt.Sprintf("data: %s\n\n", template)
} else if typeStr == "response.reasoning_summary_part.done" {
blockKey := codexClaudeThinkingKey(rootResult)
index := p.indexForKey(blockKey)

if !p.StartedKeys[blockKey] || p.StoppedKeys[blockKey] {
return []string{}
}

template = `{"type":"content_block_stop","index":0}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)

output = "event: content_block_stop\n"
output += fmt.Sprintf("data: %s\n\n", template)
p.StoppedKeys[blockKey] = true
} else if typeStr == "response.content_part.added" {
blockKey := codexClaudeTextKey(rootResult)
index := p.indexForKey(blockKey)

template = `{"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)

output = "event: content_block_start\n"
output += fmt.Sprintf("data: %s\n\n", template)
p.StartedKeys[blockKey] = true
delete(p.StoppedKeys, blockKey)
} else if typeStr == "response.output_text.delta" {
blockKey := codexClaudeTextKey(rootResult)
index := p.indexForKey(blockKey)

if !p.StartedKeys[blockKey] {
startTemplate := `{"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}`
startTemplate, _ = sjson.Set(startTemplate, "index", index)

output += "event: content_block_start\n"
output += fmt.Sprintf("data: %s\n\n", startTemplate)
p.StartedKeys[blockKey] = true
delete(p.StoppedKeys, blockKey)
}

template = `{"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":""}}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)
template, _ = sjson.Set(template, "delta.text", rootResult.Get("delta").String())

output = "event: content_block_delta\n"
output += "event: content_block_delta\n"
output += fmt.Sprintf("data: %s\n\n", template)
} else if typeStr == "response.content_part.done" {
blockKey := codexClaudeTextKey(rootResult)
index := p.indexForKey(blockKey)

if !p.StartedKeys[blockKey] || p.StoppedKeys[blockKey] {
return []string{}
}

template = `{"type":"content_block_stop","index":0}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)

output = "event: content_block_stop\n"
output += fmt.Sprintf("data: %s\n\n", template)
p.StoppedKeys[blockKey] = true
} else if typeStr == "response.completed" {
var openBlocks []struct {
Index int
Key string
}
for key := range p.StartedKeys {
if p.StartedKeys[key] && !p.StoppedKeys[key] {
openBlocks = append(openBlocks, struct {
Index int
Key string
}{
Index: p.indexForKey(key),
Key: key,
})
}
}
sort.Slice(openBlocks, func(i, j int) bool { return openBlocks[i].Index < openBlocks[j].Index })
for _, blk := range openBlocks {
stopTemplate := `{"type":"content_block_stop","index":0}`
stopTemplate, _ = sjson.Set(stopTemplate, "index", blk.Index)

output += "event: content_block_stop\n"
output += fmt.Sprintf("data: %s\n\n", stopTemplate)
p.StoppedKeys[blk.Key] = true
}

template = `{"type":"message_delta","delta":{"stop_reason":"tool_use","stop_sequence":null},"usage":{"input_tokens":0,"output_tokens":0}}`
p := (*param).(*bool)
if *p {
if p.HasToolCall {
template, _ = sjson.Set(template, "delta.stop_reason", "tool_use")
} else {
template, _ = sjson.Set(template, "delta.stop_reason", "end_turn")
}
template, _ = sjson.Set(template, "usage.input_tokens", rootResult.Get("response.usage.input_tokens").Int())
template, _ = sjson.Set(template, "usage.output_tokens", rootResult.Get("response.usage.output_tokens").Int())

output = "event: message_delta\n"
output += "event: message_delta\n"
output += fmt.Sprintf("data: %s\n\n", template)
output += "event: message_stop\n"
output += `data: {"type":"message_stop"}`
Expand All @@ -119,10 +251,16 @@ func ConvertCodexResponseToClaude(_ context.Context, _ string, originalRequestRa
itemResult := rootResult.Get("item")
itemType := itemResult.Get("type").String()
if itemType == "function_call" {
p := true
*param = &p
p.HasToolCall = true

outputIndex := rootResult.Get("output_index").Int()
callID := itemResult.Get("call_id").String()
blockKey := fmt.Sprintf("tool_use:%d:%s", outputIndex, callID)
p.ToolKeyByOutputIndex[outputIndex] = blockKey
index := p.indexForKey(blockKey)

template = `{"type":"content_block_start","index":0,"content_block":{"type":"tool_use","id":"","name":"","input":{}}}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)
template, _ = sjson.Set(template, "content_block.id", itemResult.Get("call_id").String())
{
// Restore original tool name if shortened
Expand All @@ -136,9 +274,11 @@ func ConvertCodexResponseToClaude(_ context.Context, _ string, originalRequestRa

output = "event: content_block_start\n"
output += fmt.Sprintf("data: %s\n\n", template)
p.StartedKeys[blockKey] = true
delete(p.StoppedKeys, blockKey)

template = `{"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":""}}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)

output += "event: content_block_delta\n"
output += fmt.Sprintf("data: %s\n\n", template)
Expand All @@ -147,21 +287,41 @@ func ConvertCodexResponseToClaude(_ context.Context, _ string, originalRequestRa
itemResult := rootResult.Get("item")
itemType := itemResult.Get("type").String()
if itemType == "function_call" {
outputIndex := rootResult.Get("output_index").Int()
blockKey := p.toolBlockKey(outputIndex)
index := p.indexForKey(blockKey)

if !p.StartedKeys[blockKey] || p.StoppedKeys[blockKey] {
return []string{}
}

template = `{"type":"content_block_stop","index":0}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)

output = "event: content_block_stop\n"
output += fmt.Sprintf("data: %s\n\n", template)
p.StoppedKeys[blockKey] = true
}
} else if typeStr == "response.function_call_arguments.delta" {
outputIndex := rootResult.Get("output_index").Int()
blockKey := p.toolBlockKey(outputIndex)
index := p.indexForKey(blockKey)

if !p.StartedKeys[blockKey] || p.StoppedKeys[blockKey] {
return []string{}
}

template = `{"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":""}}`
template, _ = sjson.Set(template, "index", rootResult.Get("output_index").Int())
template, _ = sjson.Set(template, "index", index)
template, _ = sjson.Set(template, "delta.partial_json", rootResult.Get("delta").String())

output += "event: content_block_delta\n"
output = "event: content_block_delta\n"
output += fmt.Sprintf("data: %s\n\n", template)
}

if output == "" {
return []string{}
}
return []string{output}
}

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