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import { gql } from "graphql-tag";
import { logger } 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;
}
export interface SchemaInfo {
workItemWidgetTypes: string[];
typeDefinitions: Map<string, TypeInfo>;
availableFeatures: Set<string>;
}
interface IntrospectionType {
name: string;
kind: string;
fields?: FieldInfo[] | null;
enumValues?: Array<{ name: string; description?: string }> | null;
}
interface IntrospectionResult {
__schema: {
types: IntrospectionType[];
};
}
const INTROSPECTION_QUERY = gql`
query IntrospectSchema {
__schema {
types {
name
kind
fields {
name
type {
name
kind
ofType {
name
kind
}
}
}
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 {
logger.debug("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,
};
logger.info(
{
widgetTypes: workItemWidgetTypes.length,
typeDefinitions: typeDefinitions.size,
features: availableFeatures.size,
},
"GraphQL schema introspection completed"
);
return this.cachedSchema;
} catch (error) {
logger.warn(
{ err: error as Error },
"Schema introspection failed, using fallback schema info"
);
// 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;
}
public getCachedSchema(): SchemaInfo | null {
return this.cachedSchema;
}
public clearCache(): void {
this.cachedSchema = null;
}
}
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