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import { gql } from 'graphql-tag';
import { logDebug, logInfo, logWarn } from '../logger';
export interface FieldInfo {
name: string;
type: {
name: string | null;
kind: string;
ofType?: {
name: string | null;
kind: string;
} | null;
};
}
export interface TypeInfo {
name: string;
fields: FieldInfo[] | null;
enumValues?: Array<{ name: string; description?: string }> | null;
}
/** A field of an output type: the named type it resolves to and its argument names. */
export interface IndexedField {
type: string;
args: ReadonlySet<string>;
}
/**
* Every type the instance's GraphQL schema declares, with its fields (output
* types) or input fields (input objects). Types without either (unions, enums,
* scalars) map to an empty field map so their existence can still be checked.
*/
export type SchemaFieldIndex = ReadonlyMap<string, ReadonlyMap<string, IndexedField>>;
export interface SchemaInfo {
workItemWidgetTypes: string[];
typeDefinitions: Map<string, TypeInfo>;
availableFeatures: Set<string>;
/** Absent when introspection failed; callers then cannot adapt to the schema. */
fieldIndex?: SchemaFieldIndex;
}
interface IntrospectionTypeRef {
name: string | null;
kind: string;
ofType?: IntrospectionTypeRef | null;
}
interface IntrospectionType {
name: string;
kind: string;
fields?: Array<FieldInfo & { args?: Array<{ name: string }> }> | null;
inputFields?: Array<{ name: string }> | null;
enumValues?: Array<{ name: string; description?: string }> | null;
}
/** Named type at the bottom of a NON_NULL/LIST wrapper chain. */
function namedType(ref: IntrospectionTypeRef | null | undefined): string {
let current = ref;
while (current && !current.name) current = current.ofType;
return current?.name ?? '';
}
function buildFieldIndex(types: IntrospectionType[]): SchemaFieldIndex {
const index = new Map<string, Map<string, IndexedField>>();
for (const type of types) {
if (!type.name) continue;
const fields = new Map<string, IndexedField>();
for (const field of type.fields ?? []) {
fields.set(field.name, {
type: namedType(field.type),
args: new Set((field.args ?? []).map((arg) => arg.name)),
});
}
// Input object fields, so handlers can tell which mutation inputs exist.
for (const inputField of type.inputFields ?? []) {
fields.set(inputField.name, { type: '', args: new Set() });
}
index.set(type.name, fields);
}
return index;
}
interface IntrospectionResult {
__schema: {
types: IntrospectionType[];
};
}
const INTROSPECTION_QUERY = gql`
query IntrospectSchema {
__schema {
types {
name
kind
fields {
name
args {
name
}
type {
name
kind
ofType {
name
kind
ofType {
name
kind
ofType {
name
kind
}
}
}
}
}
inputFields {
name
}
enumValues {
name
description
}
}
}
}
`;
export class SchemaIntrospector {
private client: GraphQLClient;
private cachedSchema: SchemaInfo | null = null;
constructor(client: GraphQLClient) {
this.client = client;
}
public async introspectSchema(): Promise<SchemaInfo> {
if (this.cachedSchema) {
return this.cachedSchema;
}
try {
logDebug('Introspecting GitLab GraphQL schema...');
const result = await this.client.request<IntrospectionResult>(INTROSPECTION_QUERY);
const types = result.__schema.types;
// Extract WorkItem widget types
const workItemWidgetType = types.find((type) => type.name === 'WorkItemWidgetType');
const workItemWidgetTypes = workItemWidgetType?.enumValues?.map((value) => value.name) ?? [];
// Build type definitions map
const typeDefinitions = new Map<string, TypeInfo>();
// Focus on WorkItem-related types
const relevantTypes = types.filter(
(type) =>
type.name &&
(type.name.startsWith('WorkItem') ||
type.name.includes('Widget') ||
type.name === 'AwardEmoji' ||
type.name === 'Milestone' ||
type.name === 'User' ||
type.name === 'Label'),
);
for (const type of relevantTypes) {
typeDefinitions.set(type.name, {
name: type.name,
fields: type.fields ?? null,
enumValues: type.enumValues ?? null,
});
}
// Determine available features based on widget types
const availableFeatures = new Set<string>();
for (const widgetType of workItemWidgetTypes) {
availableFeatures.add(widgetType);
}
this.cachedSchema = {
workItemWidgetTypes,
typeDefinitions,
availableFeatures,
fieldIndex: buildFieldIndex(types),
};
logInfo('GraphQL schema introspection completed', {
widgetTypes: workItemWidgetTypes.length,
typeDefinitions: typeDefinitions.size,
features: availableFeatures.size,
});
return this.cachedSchema;
} catch (error) {
logWarn('Schema introspection failed, using fallback schema info', {
err: error as Error,
});
// Provide fallback schema info when introspection fails
this.cachedSchema = {
workItemWidgetTypes: [
'ASSIGNEES',
'LABELS',
'MILESTONE',
'DESCRIPTION',
'START_AND_DUE_DATE',
'WEIGHT',
'TIME_TRACKING',
'HEALTH_STATUS',
'COLOR',
'NOTIFICATIONS',
'NOTES',
],
typeDefinitions: new Map(),
availableFeatures: new Set(['workItems', 'epics', 'issues']),
};
return this.cachedSchema;
}
}
public isWidgetTypeAvailable(widgetType: string): boolean {
if (!this.cachedSchema) {
throw new Error('Schema not introspected yet. Call introspectSchema() first.');
}
return this.cachedSchema.availableFeatures.has(widgetType);
}
public getFieldsForType(typeName: string): FieldInfo[] {
if (!this.cachedSchema) {
throw new Error('Schema not introspected yet. Call introspectSchema() first.');
}
const typeInfo = this.cachedSchema.typeDefinitions.get(typeName);
if (typeInfo?.fields) {
return typeInfo.fields;
}
// Fallback field information for common widget types when full schema unavailable
if (typeName === 'WorkItemWidgetAssignees') {
return [{ name: 'assignees', type: { name: 'UserConnection', kind: 'OBJECT' } }];
}
if (typeName === 'WorkItemWidgetLabels') {
return [{ name: 'labels', type: { name: 'LabelConnection', kind: 'OBJECT' } }];
}
if (typeName === 'WorkItemWidgetMilestone') {
return [{ name: 'milestone', type: { name: 'Milestone', kind: 'OBJECT' } }];
}
return [];
}
public hasField(typeName: string, fieldName: string): boolean {
const fields = this.getFieldsForType(typeName);
return fields.some((field) => field.name === fieldName);
}
public getAvailableWidgetTypes(): string[] {
if (!this.cachedSchema) {
throw new Error('Schema not introspected yet. Call introspectSchema() first.');
}
return this.cachedSchema.workItemWidgetTypes;
}
public generateSafeWidgetQuery(requestedWidgets: string[]): string {
if (!this.cachedSchema) {
throw new Error('Schema not introspected yet. Call introspectSchema() first.');
}
const safeWidgets: string[] = [];
for (const widget of requestedWidgets) {
if (this.isWidgetTypeAvailable(widget)) {
const widgetTypeName = `WorkItemWidget${
widget.charAt(0) +
widget
.slice(1)
.toLowerCase()
.replace(/_([a-z])/g, (_, letter: string) => letter.toUpperCase())
}`;
// Generate safe field selections for this widget
const fields = this.getFieldsForType(widgetTypeName);
const safeFields = this.generateSafeFieldSelections(fields);
Eif (safeFields.length > 0) {
safeWidgets.push(`
... on ${widgetTypeName} {
${safeFields.join('\n ')}
}
`);
}
}
}
return safeWidgets.join('\n');
}
private generateSafeFieldSelections(fields: FieldInfo[]): string[] {
const safeFields: string[] = [];
for (const field of fields) {
// Skip complex fields that require sub-selections for now
if (field.type.kind === 'SCALAR' || field.type.kind === 'ENUM') {
safeFields.push(field.name);
} else Eif (field.type.kind === 'OBJECT' && field.name !== 'type') {
// Add basic object fields with simple sub-selections
Iif (field.name === 'milestone') {
safeFields.push(`${field.name} { id title state }`);
} else if (field.name === 'assignees' || field.name === 'participants') {
safeFields.push(`${field.name} { nodes { id username } }`);
} else Eif (field.name === 'labels') {
safeFields.push(`${field.name} { nodes { id title color } }`);
}
}
}
return safeFields;
}
/**
* Populate the internal cache from externally-provided SchemaInfo.
* Used when ConnectionManager restores introspection data from its caches
* (introspectionCache or InstanceRegistry) so that callers who access
* the SchemaIntrospector directly (e.g. DynamicWorkItemsQuery) see the
* same widget/type data without a redundant GraphQL introspection call.
*/
public rehydrate(schema: SchemaInfo): void {
this.cachedSchema = schema;
}
public getCachedSchema(): SchemaInfo | null {
return this.cachedSchema;
}
public clearCache(): void {
this.cachedSchema = null;
}
}
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