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import { gitlab } from '../../utils/gitlab-api';
import { normalizeProjectId } from '../../utils/projectIdentifier';
import { encodeApiSegment } from '../../utils/api-path';
import { extractSimpleId } from '../../utils/idConversion';
import { DUO_RESPONSE_BYTES, requestDuo } from './queries';
import type { DuoProject } from './access';
interface Target {
ref?: string;
source_branch?: string;
source?: string;
sha?: string;
}
interface MergeRequest {
id: number;
iid: number;
project_id: number;
source_project_id: number;
source_branch: string;
state: string;
web_url: string;
author: { id: number };
}
interface AttachedMergeRequest {
sourceBranch: string;
state: string;
webUrl: string;
author: { id: string };
}
const PIPELINE = gql`
query DuoPipelineContext($path: ID!, $id: CiPipelineID!) {
project(fullPath: $path) {
id
pipeline(id: $id) {
id
mergeRequest {
sourceBranch
state
webUrl
author {
id
}
}
}
}
}
`;
/** Share a ten-request ceiling across candidate and commit pagination before any write. */
function contextReader() {
let requests = 0;
return async function read<T>(
path: string,
query: Record<string, string | number>,
): Promise<T[]> {
const items: T[] = [];
async function page(number: number): Promise<void> {
if (requests === 10)
throw new Error('Pipeline context lookup limit reached; no session was started');
requests++;
const rows = await gitlab.get<T[]>(path, {
query: { ...query, per_page: 100, page: number },
rawResponse: true,
responseByteLimit: DUO_RESPONSE_BYTES,
});
if (!Array.isArray(rows) || rows.length > 100)
throw new Error('Invalid pipeline context page');
items.push(...rows);
if (rows.length === 100) await page(number + 1);
}
await page(1);
return items;
};
}
async function associatedMergeRequest(
project: DuoProject,
branch: string,
sha: string,
): Promise<MergeRequest | null> {
const read = contextReader();
const rows = await read<MergeRequest>('merge_requests', {
scope: 'all',
state: 'opened',
source_project_id: project.id,
source_branch: branch,
});
const candidates = rows.filter(
(mr) =>
String(mr.source_project_id) === project.id &&
mr.source_branch === branch &&
mr.state === 'opened',
);
if (candidates.some((mr) => !Number.isSafeInteger(mr.id)))
throw new Error('Invalid associated merge request identity');
candidates.sort((left, right) => right.id - left.id);
// GitLab selects the newest open MR containing this commit, including fork targets.
async function matching(index: number): Promise<MergeRequest | null> {
if (index === candidates.length) return null;
const mr = candidates[index];
const commits = await read<{ id: string }>(
`projects/${normalizeProjectId(String(mr.project_id))}/merge_requests/${encodeApiSegment(mr.iid)}/commits`,
{},
);
if (commits.some((commit) => commit.id === sha)) return mr;
return matching(index + 1);
}
return matching(0);
}
function branchValue(value: string | undefined): string {
if (!value)
throw new Error('GitLab did not expose the target source branch; no session was started');
return value;
}
async function attachedMergeRequest(
project: DuoProject,
id: string,
): Promise<AttachedMergeRequest> {
const result = await requestDuo<{
project: {
id: string;
pipeline: { id: string; mergeRequest: AttachedMergeRequest | null } | null;
} | null;
}>(PIPELINE, {
path: project.path,
id: `gid://gitlab/Ci::Pipeline/${id}`,
});
const pipeline = result.project?.pipeline;
const mr = pipeline?.mergeRequest;
if (
!result.project ||
extractSimpleId(result.project.id) !== project.id ||
!pipeline ||
extractSimpleId(pipeline.id) !== id ||
!mr
)
throw new Error(
'GitLab did not expose the pipeline source merge request; no session was started',
);
return mr;
}
export async function legacyGoalContext(
project: DuoProject,
flow: string,
target: Target,
goal: string,
id: string,
): Promise<Record<string, unknown>> {
if (flow === 'code_review/v1') return { goal, source_branch: branchValue(target.source_branch) };
let branch: string;
let mergeRequest: { url: string; author_id: string } | null = null;
if (target.source === 'merge_request_event') {
const mr = await attachedMergeRequest(project, id);
branch = branchValue(mr.sourceBranch);
if (mr.state === 'opened')
mergeRequest = { url: mr.webUrl, author_id: extractSimpleId(mr.author.id) };
} else {
branch = branchValue(target.ref);
if (!target.sha)
throw new Error('GitLab did not expose the pipeline commit; no session was started');
const mr = await associatedMergeRequest(project, branch, target.sha);
if (mr) mergeRequest = { url: mr.web_url, author_id: String(mr.author.id) };
}
if (!target.source)
throw new Error('GitLab did not expose the pipeline source; no session was started');
// Match GitLab's PipelineContextBuilder, including its explicit no-MR marker.
// https://gitlab.com/gitlab-org/gitlab/-/blob/v19.5.0-ee/ee/app/services/ai/duo_workflows/additional_context/pipeline_context_builder.rb
return {
goal,
source_branch: branch,
additional_context: [
{
Category: 'merge_request',
Content: JSON.stringify(mergeRequest ?? { url: '' }),
metadata: { version: '1.0.0' },
},
{
Category: 'pipeline',
Content: JSON.stringify({ source_branch: branch, source: target.source }),
metadata: { version: '1.0.0' },
},
],
};
}
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