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import { InjectRepository } from '@nestjs/typeorm';
import { DataSource, Repository } from 'typeorm';
import {
Session,
Project,
ContextTemplate,
SystemPrompt,
SessionInput,
AIAction,
ExecutionLog,
} from '../core-entities';
import * as fs from 'fs/promises';
import * as path from 'path';
import {
CreateSessionDto,
UpdateSessionDto,
SessionStatus,
RevertSessionResponseDto,
} from './dto/session.dto';
import { ApplicationStateService } from '../application-state/application-state.service';
import { Trace } from '../utils';
import { MessageBusService } from '../message-bus/message-bus.service';
@Injectable()
export class SessionsService {
private readonly logger = new Logger(SessionsService.name);
constructor(
@InjectRepository(Session)
private sessionsRepository: Repository<Session>,
@InjectRepository(Project)
private projectsRepository: Repository<Project>,
@InjectRepository(ContextTemplate)
private contextTemplatesRepository: Repository<ContextTemplate>,
@InjectRepository(SystemPrompt)
private systemPromptsRepository: Repository<SystemPrompt>,
private readonly applicationStateService: ApplicationStateService,
private readonly messageBusService: MessageBusService,
private readonly dataSource: DataSource,
) {}
@Trace()
async create(createSessionDto: CreateSessionDto): Promise<Session> {
this.messageBusService.clear();
const session = this.sessionsRepository.create({
...createSessionDto,
status: SessionStatus.ACTIVE,
});
if (!createSessionDto.model_id) {
const manualModeEnabled =
await this.applicationStateService.getManualLlmEnabled();
if (!manualModeEnabled) {
const recentModels =
await this.applicationStateService.getRecentModels();
if (recentModels.length > 0) {
session.model_id = recentModels[0];
}
}
}
if (createSessionDto.project_id) {
const project = await this.projectsRepository.findOneBy({
id: createSessionDto.project_id,
});
if (!project) {
throw new NotFoundException(
`Project with ID "${createSessionDto.project_id}" not found`,
);
}
session.project = project;
}
if (createSessionDto.system_prompt_id) {
const systemPrompt = await this.systemPromptsRepository.findOneBy({
id: createSessionDto.system_prompt_id,
});
if (!systemPrompt) {
throw new NotFoundException(
`SystemPrompt with ID "${createSessionDto.system_prompt_id}" not found`,
);
}
session.systemPrompt = systemPrompt;
} else {
const defaultSystemPrompt = await this.systemPromptsRepository.findOneBy({
is_default: true,
});
if (defaultSystemPrompt) {
session.systemPrompt = defaultSystemPrompt;
}
}
Iif (createSessionDto.default_initial_context_template_id) {
const template = await this.contextTemplatesRepository.findOneBy({
id: createSessionDto.default_initial_context_template_id,
});
Iif (!template) {
throw new NotFoundException(
`ContextTemplate with ID "${createSessionDto.default_initial_context_template_id}" not found`,
);
}
session.defaultInitialContextTemplate = template;
} else {
const defaultInitial = await this.contextTemplatesRepository.findOneBy({
is_default_initial: true,
});
if (defaultInitial) {
session.defaultInitialContextTemplate = defaultInitial;
}
}
Iif (createSessionDto.default_followup_context_template_id) {
const template = await this.contextTemplatesRepository.findOneBy({
id: createSessionDto.default_followup_context_template_id,
});
Iif (!template) {
throw new NotFoundException(
`ContextTemplate with ID "${createSessionDto.default_followup_context_template_id}" not found`,
);
}
session.defaultFollowupContextTemplate = template;
} else {
const defaultFollowup = await this.contextTemplatesRepository.findOneBy({
is_default_followup: true,
});
if (defaultFollowup) {
session.defaultFollowupContextTemplate = defaultFollowup;
}
}
const savedSession = await this.sessionsRepository.save(session);
await this.applicationStateService.setActiveSessionId(savedSession.id);
return this.findOne(savedSession.id);
}
@Trace()
async findAll(filter?: string): Promise<Session[]> {
const query = this.sessionsRepository
.createQueryBuilder('session')
.leftJoinAndSelect('session.project', 'project')
.leftJoinAndSelect(
'session.defaultInitialContextTemplate',
'defaultInitialContextTemplate',
)
.leftJoinAndSelect(
'session.defaultFollowupContextTemplate',
'defaultFollowupContextTemplate',
)
.leftJoinAndSelect('session.systemPrompt', 'systemPrompt')
.leftJoinAndSelect('session.subAgent', 'subAgent')
.leftJoinAndSelect('session.parentSession', 'parentSession')
.addSelect(
(subQuery) =>
subQuery
.select('COUNT(si.id)')
.from(SessionInput, 'si')
.where('si.session_id = session.id'),
'sessionInputCount',
);
Iif (filter === 'non-empty') {
query.where(
'EXISTS (SELECT 1 FROM session_inputs si WHERE si.session_id = session.id)',
);
}
const result = await query.getRawAndEntities();
return result.entities.map((session, index) => {
const raw = result.raw[index];
session.sessionInputCount = parseInt(raw.sessionInputCount, 10) || 0;
return session;
});
}
@Trace()
async findOne(id: string, includeExecutionLogs = false): Promise<Session> {
const relations: string[] = [
'project',
'defaultInitialContextTemplate',
'defaultFollowupContextTemplate',
'systemPrompt',
'sessionInputs',
'sessionInputs.contextTemplate',
'sessionInputs.aiActions',
'subAgent',
'parentSession',
];
// Only load executionLogs when explicitly requested (they can be large)
if (includeExecutionLogs) {
relations.push('sessionInputs.aiActions.executionLogs');
}
const session = await this.sessionsRepository.findOne({
where: { id },
relations,
order: {
sessionInputs: {
sequence_number: 'ASC',
aiActions: {
order_of_execution: 'ASC',
},
},
},
});
if (!session) {
throw new NotFoundException(`Session with ID "${id}" not found`);
}
return session;
}
/**
* Lightweight version of findOne() for boot/initial load.
* Excludes heavy sessionInputs relation with nested aiActions and executionLogs.
* Used by findActive() to speed up initial session loading.
*/
@Trace()
async findOneLight(id: string): Promise<Session> {
const session = await this.sessionsRepository.findOne({
where: { id },
relations: [
'project',
'defaultInitialContextTemplate',
'defaultFollowupContextTemplate',
'systemPrompt',
'subAgent',
'parentSession',
],
});
if (!session) {
throw new NotFoundException(`Session with ID "${id}" not found`);
}
return session;
}
@Trace()
async findActive(): Promise<Session | null> {
const activeSessionId =
await this.applicationStateService.getActiveSessionId();
if (!activeSessionId) {
return null;
}
try {
// Use lightweight findOneLight for boot performance
// Frontend can call findOne() separately when full details needed
return await this.findOneLight(activeSessionId);
} catch (error) {
if (error instanceof NotFoundException) {
// The active session ID points to a session that no longer exists.
return null;
}
throw error;
}
}
@Trace()
async findLatest(): Promise<Session | null> {
return this.sessionsRepository.findOne({
order: { created_at: 'DESC' },
});
}
@Trace()
async setActive(id: string): Promise<void> {
// Use lightweight existence check instead of heavy findOne()
const exists = await this.sessionsRepository.existsBy({ id });
if (!exists) {
throw new NotFoundException(`Session with ID "${id}" not found`);
}
await this.applicationStateService.setActiveSessionId(id);
}
@Trace()
async update(
id: string,
updateSessionDto: UpdateSessionDto,
): Promise<Session> {
const session = await this.sessionsRepository.findOneBy({ id });
if (!session) {
throw new NotFoundException(`Session with ID "${id}" not found`);
}
Iif (updateSessionDto.model_id !== undefined) {
session.model_id = updateSessionDto.model_id;
}
Iif (updateSessionDto.reasoning_effort !== undefined) {
session.reasoning_effort = updateSessionDto.reasoning_effort;
}
if (updateSessionDto.session_title !== undefined) {
session.session_title = updateSessionDto.session_title;
}
if (updateSessionDto.status !== undefined) {
session.status = updateSessionDto.status;
if (
[
SessionStatus.COMPLETED,
SessionStatus.ABORTED,
SessionStatus.FAILED,
].includes(updateSessionDto.status)
) {
session.end_time = new Date();
}
}
Iif (updateSessionDto.system_prompt_id !== undefined) {
session.system_prompt_id = updateSessionDto.system_prompt_id;
}
Iif (updateSessionDto.default_initial_context_template_id !== undefined) {
session.default_initial_context_template_id =
updateSessionDto.default_initial_context_template_id;
}
Iif (updateSessionDto.default_followup_context_template_id !== undefined) {
session.default_followup_context_template_id =
updateSessionDto.default_followup_context_template_id;
}
Iif (updateSessionDto.url !== undefined) {
session.url = updateSessionDto.url;
}
Iif (updateSessionDto.sub_agent_id !== undefined) {
session.sub_agent_id = updateSessionDto.sub_agent_id;
}
Iif (updateSessionDto.parent_session_id !== undefined) {
session.parent_session_id = updateSessionDto.parent_session_id;
}
await this.sessionsRepository.save(session);
return this.findOne(id);
}
@Trace()
async remove(id: string): Promise<void> {
const session = await this.findOne(id);
// Get all descendant sessions recursively (children, grandchildren, etc.)
const descendantIds = await this.findAllDescendantSessions(id);
// Delete descendants first (bottom-up) to avoid FK violations
// Process in reverse order (deepest first)
for (const descendantId of descendantIds.reverse()) {
const descendant = await this.sessionsRepository.findOneBy({
id: descendantId,
});
if (descendant) {
await this.sessionsRepository.remove(descendant);
}
}
// Finally delete the target session
await this.sessionsRepository.remove(session);
}
/**
* Recursively finds all descendant session IDs in depth-first order.
* Returns sessions in order from root to leaves (parent before children).
* For deletion, reverse this order to delete children first.
*/
private async findAllDescendantSessions(
parentSessionId: string,
): Promise<string[]> {
const children = await this.sessionsRepository.find({
where: { parent_session_id: parentSessionId },
select: ['id'],
});
const result: string[] = [];
for (const child of children) {
result.push(child.id);
// Recursively find grandchildren
const descendants = await this.findAllDescendantSessions(child.id);
result.push(...descendants);
}
return result;
}
@Trace()
async findChildSessions(parentSessionId: string): Promise<Session[]> {
return this.sessionsRepository.find({
where: { parent_session_id: parentSessionId },
relations: ['subAgent', 'sessionInputs', 'sessionInputs.contextTemplate'],
order: { created_at: 'DESC' },
});
}
@Trace()
async getFileChanges(sessionId: string): Promise<
{
file_path: string;
initial_content: string | null;
current_content: string | null;
}[]
> {
const session = await this.findOne(sessionId);
const projectRoot = process.env.REPOBURG_PROJECT_PATH || process.cwd();
// Collect all file actions from all session inputs
const fileActionTypes = [
'create_file',
'overwrite_file',
'delete_file',
'quick_edit',
'patch',
'apply_diff',
];
const fileActionsMap = new Map<string, AIAction[]>();
for (const input of session.sessionInputs || []) {
for (const action of input.aiActions || []) {
if (action.file_path && fileActionTypes.includes(action.action_type)) {
const existing = fileActionsMap.get(action.file_path) || [];
existing.push(action);
fileActionsMap.set(action.file_path, existing);
}
}
}
const changes: {
file_path: string;
initial_content: string | null;
current_content: string | null;
}[] = [];
for (const [filePath, actions] of fileActionsMap) {
// Sort by creation time to find oldest
const sortedActions = actions.sort(
(a, b) =>
new Date(a.created_at).getTime() - new Date(b.created_at).getTime(),
);
// Get initial content from oldest action's original_content_for_revert
const oldestAction = sortedActions[0];
const initialContent = oldestAction.original_content_for_revert;
// Read current content from filesystem
let currentContent: string | null = null;
try {
const safePath = path.resolve(projectRoot, filePath);
if (safePath.startsWith(projectRoot)) {
currentContent = await fs.readFile(safePath, 'utf8');
}
} catch {
// File doesn't exist or can't be read
currentContent = null;
}
changes.push({
file_path: filePath,
initial_content: initialContent,
current_content: currentContent,
});
}
// Sort by file path
return changes.sort((a, b) => a.file_path.localeCompare(b.file_path));
}
@Trace()
async cloneSession(sourceSessionId: string): Promise<Session> {
// Load source session with all relations INCLUDING executionLogs for cloning
const sourceSession = await this.findOne(sourceSessionId, true);
const queryRunner = this.dataSource.createQueryRunner();
await queryRunner.connect();
await queryRunner.startTransaction();
try {
// Create new session
const newSession = queryRunner.manager.create(Session, {
project_id: sourceSession.project_id,
session_title: sourceSession.session_title
? `${sourceSession.session_title} (Copy)`
: 'Cloned Session',
status: SessionStatus.ACTIVE,
system_prompt_id: sourceSession.system_prompt_id,
default_initial_context_template_id:
sourceSession.default_initial_context_template_id,
default_followup_context_template_id:
sourceSession.default_followup_context_template_id,
model_id: sourceSession.model_id,
reasoning_effort: sourceSession.reasoning_effort,
url: sourceSession.url,
sub_agent_id: sourceSession.sub_agent_id,
// parent_session_id is intentionally NULL - not linked to parent
});
await queryRunner.manager.save(newSession);
// Clone session inputs with their actions and logs
if (sourceSession.sessionInputs) {
for (const sourceInput of sourceSession.sessionInputs) {
const newInput = queryRunner.manager.create(SessionInput, {
session_id: newSession.id,
sequence_number: sourceInput.sequence_number,
user_prompt: sourceInput.user_prompt,
context_template_id: sourceInput.context_template_id,
ad_hoc_context_definition: sourceInput.ad_hoc_context_definition,
generated_context_string: sourceInput.generated_context_string,
execution_strategy: sourceInput.execution_strategy,
raw_llm_response: sourceInput.raw_llm_response,
llm_response_explanation: sourceInput.llm_response_explanation,
raw_studio_request_body: sourceInput.raw_studio_request_body,
idempotency_key: sourceInput.idempotency_key,
is_context_carrier: sourceInput.is_context_carrier,
thoughts: sourceInput.thoughts,
role: sourceInput.role,
external_conversation_id: sourceInput.external_conversation_id,
external_turn_id: sourceInput.external_turn_id,
input_token_count: sourceInput.input_token_count,
cached_token_count: sourceInput.cached_token_count,
output_token_count: sourceInput.output_token_count,
error_message: sourceInput.error_message,
tool_calls: sourceInput.tool_calls,
});
await queryRunner.manager.save(newInput);
// Clone AIActions for this input
if (sourceInput.aiActions) {
for (const sourceAction of sourceInput.aiActions) {
const newAction = queryRunner.manager.create(AIAction, {
input_id: newInput.id,
action_type: sourceAction.action_type,
file_path: sourceAction.file_path,
content: sourceAction.content,
original_content_for_revert:
sourceAction.original_content_for_revert,
command_string: sourceAction.command_string,
files: sourceAction.files,
folders: sourceAction.folders,
reason: sourceAction.reason,
handover_string: sourceAction.handover_string,
status: sourceAction.status,
order_of_execution: sourceAction.order_of_execution,
server_name: sourceAction.server_name,
tool_name: sourceAction.tool_name,
arguments: sourceAction.arguments,
plain: sourceAction.plain,
tool_call_id: sourceAction.tool_call_id,
});
await queryRunner.manager.save(newAction);
// Clone ExecutionLogs for this action
if (sourceAction.executionLogs) {
for (const sourceLog of sourceAction.executionLogs) {
const newLog = queryRunner.manager.create(ExecutionLog, {
action_id: newAction.id,
output: sourceLog.output,
error_message: sourceLog.error_message,
});
await queryRunner.manager.save(newLog);
}
}
}
}
}
}
await queryRunner.commitTransaction();
// Return the cloned session with all relations including executionLogs
return this.findOne(newSession.id, true);
} catch (error) {
await queryRunner.rollbackTransaction();
throw error;
} finally {
await queryRunner.release();
}
}
/**
* Revert a specific file to its state before the session started.
* Finds the oldest action for this file and restores original_content_for_revert.
*/
@Trace()
async revertFile(sessionId: string, filePath: string): Promise<void> {
const session = await this.findOne(sessionId);
const projectRoot = process.env.REPOBURG_PROJECT_PATH || process.cwd();
// Collect all file actions for this specific file path
const fileActionTypes = [
'create_file',
'overwrite_file',
'delete_file',
'quick_edit',
'patch',
'apply_diff',
];
const fileActions: AIAction[] = [];
for (const input of session.sessionInputs || []) {
for (const action of input.aiActions || []) {
if (
action.file_path === filePath &&
fileActionTypes.includes(action.action_type)
) {
fileActions.push(action);
}
}
}
if (fileActions.length === 0) {
throw new NotFoundException(
`No file actions found for path "${filePath}" in session ${sessionId}`,
);
}
// Sort by creation time to find oldest
const sortedActions = fileActions.sort(
(a, b) =>
new Date(a.created_at).getTime() - new Date(b.created_at).getTime(),
);
const oldestAction = sortedActions[0];
const originalContent = oldestAction.original_content_for_revert;
const safePath = path.resolve(projectRoot, filePath);
if (!safePath.startsWith(projectRoot)) {
throw new NotFoundException(`Path traversal detected: ${filePath}`);
}
try {
if (originalContent === null) {
// File was created by this session - delete it
await fs.unlink(safePath);
this.logger.log(`Reverted created file by deleting: ${filePath}`);
} else {
// File was modified - restore original content
await fs.mkdir(path.dirname(safePath), { recursive: true });
await fs.writeFile(safePath, originalContent, 'utf8');
this.logger.log(`Reverted file to original content: ${filePath}`);
}
// Mark all actions for this file as confirmed_reverted
for (const action of fileActions) {
action.status = 'confirmed_reverted';
await this.dataSource.manager.save(AIAction, action);
}
} catch (error) {
this.logger.error(`Failed to revert file ${filePath}: ${error.message}`);
throw error;
}
}
/**
* Get file changes for specific inputs within a session.
* Used for section-level diff view.
*/
@Trace()
async getInputFileChanges(
sessionId: string,
inputIds: string[],
): Promise<
{
file_path: string;
initial_content: string | null;
current_content: string | null;
}[]
> {
const session = await this.findOne(sessionId);
// Validate inputIds belong to this session
const sessionInputIds = (session.sessionInputs || []).map((i) => i.id);
for (const inputId of inputIds) {
if (!sessionInputIds.includes(inputId)) {
throw new NotFoundException(
`Input with ID "${inputId}" not found in session ${sessionId}`,
);
}
}
// Filter inputs to the specified IDs
const targetInputs = (session.sessionInputs || []).filter((i) =>
inputIds.includes(i.id),
);
// Collect file actions from target inputs
const fileActionTypes = [
'create_file',
'overwrite_file',
'delete_file',
'quick_edit',
'patch',
'apply_diff',
];
const fileActionsMap = new Map<string, AIAction[]>();
for (const input of targetInputs) {
for (const action of input.aiActions || []) {
if (action.file_path && fileActionTypes.includes(action.action_type)) {
const existing = fileActionsMap.get(action.file_path) || [];
existing.push(action);
fileActionsMap.set(action.file_path, existing);
}
}
}
const changes: {
file_path: string;
initial_content: string | null;
current_content: string | null;
}[] = [];
for (const [filePath, actions] of fileActionsMap) {
// Sort by creation time to find oldest and newest actions in this section
const sortedActions = actions.sort(
(a, b) =>
new Date(a.created_at).getTime() - new Date(b.created_at).getTime(),
);
// Get initial content from oldest action's original_content_for_revert
const oldestAction = sortedActions[0];
const initialContent = oldestAction.original_content_for_revert;
// Get current content from newest action's content (what this section produced)
// This ensures section diff shows only changes made within this section,
// not cumulative changes from later sections that exist on filesystem
const newestAction = sortedActions[sortedActions.length - 1];
const currentContent = newestAction.content;
changes.push({
file_path: filePath,
initial_content: initialContent,
current_content: currentContent,
});
}
// Sort by file path
return changes.sort((a, b) => a.file_path.localeCompare(b.file_path));
}
/**
* Revert file changes for specific inputs within a session.
* Used for section-level revert.
*/
@Trace()
async revertInputFileChanges(
sessionId: string,
inputIds: string[],
): Promise<RevertSessionResponseDto> {
const session = await this.findOne(sessionId);
const projectRoot = process.env.REPOBURG_PROJECT_PATH || process.cwd();
// Validate inputIds belong to this session
const sessionInputIds = (session.sessionInputs || []).map((i) => i.id);
for (const inputId of inputIds) {
if (!sessionInputIds.includes(inputId)) {
throw new NotFoundException(
`Input with ID "${inputId}" not found in session ${sessionId}`,
);
}
}
// Filter inputs to the specified IDs
const targetInputs = (session.sessionInputs || []).filter((i) =>
inputIds.includes(i.id),
);
// Collect file actions from target inputs
const fileActionTypes = [
'create_file',
'overwrite_file',
'delete_file',
'quick_edit',
'patch',
'apply_diff',
];
const fileActionsMap = new Map<string, AIAction[]>();
for (const input of targetInputs) {
for (const action of input.aiActions || []) {
if (action.file_path && fileActionTypes.includes(action.action_type)) {
const existing = fileActionsMap.get(action.file_path) || [];
existing.push(action);
fileActionsMap.set(action.file_path, existing);
}
}
}
const result: RevertSessionResponseDto = {
reverted: [],
failed: [],
errors: [],
};
// Also check for conflicts - files modified in inputs after our target inputs
const targetInputSequences = targetInputs.map((i) => i.sequence_number);
const maxTargetSequence = Math.max(...targetInputSequences);
const laterInputs = (session.sessionInputs || []).filter(
(i) => i.sequence_number > maxTargetSequence,
);
const laterFilePaths = new Set<string>();
for (const input of laterInputs) {
for (const action of input.aiActions || []) {
if (action.file_path && fileActionTypes.includes(action.action_type)) {
laterFilePaths.add(action.file_path);
}
}
}
// Process each file
for (const [filePath, actions] of fileActionsMap) {
try {
const sortedActions = actions.sort(
(a, b) =>
new Date(a.created_at).getTime() - new Date(b.created_at).getTime(),
);
const oldestAction = sortedActions[0];
const originalContent = oldestAction.original_content_for_revert;
const safePath = path.resolve(projectRoot, filePath);
if (!safePath.startsWith(projectRoot)) {
result.failed.push(filePath);
result.errors.push(`Path traversal detected: ${filePath}`);
continue;
}
if (originalContent === null) {
// File was created - delete it
await fs.unlink(safePath);
this.logger.log(
`Reverted section-created file by deleting: ${filePath}`,
);
} else {
// File was modified - restore original content
await fs.mkdir(path.dirname(safePath), { recursive: true });
await fs.writeFile(safePath, originalContent, 'utf8');
this.logger.log(
`Reverted file to section-start content: ${filePath}`,
);
}
// Mark these specific actions as confirmed_reverted
for (const action of actions) {
action.status = 'confirmed_reverted';
await this.dataSource.manager.save(AIAction, action);
}
result.reverted.push(filePath);
} catch (error) {
result.failed.push(filePath);
result.errors.push(error.message);
}
}
return result;
}
/**
* Revert all file changes made in this session.
* Returns lists of reverted and failed files.
*/
@Trace()
async revertSession(sessionId: string): Promise<RevertSessionResponseDto> {
const changes = await this.getFileChanges(sessionId);
const result: RevertSessionResponseDto = {
reverted: [],
failed: [],
errors: [],
};
// Process in order: first delete created files, then restore modified/deleted
const createdFiles = changes.filter(
(c) => c.initial_content === null && c.current_content !== null,
);
const otherFiles = changes.filter(
(c) => c.initial_content !== null || c.current_content === null,
);
// Revert created files first (delete them)
for (const change of createdFiles) {
try {
await this.revertFile(sessionId, change.file_path);
result.reverted.push(change.file_path);
} catch (error) {
result.failed.push(change.file_path);
result.errors.push(error.message);
}
}
// Then revert modified/deleted files (restore them)
for (const change of otherFiles) {
try {
await this.revertFile(sessionId, change.file_path);
result.reverted.push(change.file_path);
} catch (error) {
result.failed.push(change.file_path);
result.errors.push(error.message);
}
}
return result;
}
}
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