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import type { Bus } from "../bus/bus.js";
import type { AuthContract } from "../contracts/auth.js";
import type {
ConfigAccess,
EventsEmitter,
Extension,
HostAPI,
Logger,
Manifest,
PermissionGate,
ScheduledJob,
SecretsAccess,
StorageNamespace,
} from "../contracts/extension.js";
import type {
EventHandler,
EventHookDescriptor,
FilterDescriptor,
FilterHandler,
ServiceHandle,
} from "../contracts/hooks.js";
import type { ProviderContract } from "../contracts/provider.js";
import type { ToolContract } from "../contracts/tool.js";
import { resolveActivationOrder } from "./dag.js";
import { isApiVersionCompatible } from "./version.js";
export const KERNEL_API_VERSION = "0.1.0";
export interface DisabledExtension {
readonly manifest: Manifest;
readonly reason: string;
}
export interface HostDeps {
readonly logger: Logger;
readonly config: ConfigAccess;
readonly storageFactory: (namespace: string) => StorageNamespace;
readonly secrets: SecretsAccess;
readonly permissions: PermissionGate;
readonly scheduler: { readonly register: (job: ScheduledJob) => void };
readonly bus: Bus;
readonly events: EventsEmitter;
}
export interface Host {
readonly activate: () => Promise<void>;
readonly deactivate: () => Promise<void>;
readonly getTools: () => ReadonlyMap<string, ToolContract>;
readonly getTool: (name: string) => ToolContract | undefined;
readonly getProviders: () => ReadonlyMap<string, ProviderContract>;
readonly getProvider: (id: string) => ProviderContract | undefined;
readonly getAuthProviders: () => ReadonlyMap<string, AuthContract>;
readonly getAuthProvider: (id: string) => AuthContract | undefined;
readonly getScheduledJobs: () => readonly ScheduledJob[];
readonly getMigrations: () => readonly string[];
readonly getDisabled: () => readonly DisabledExtension[];
}
export function createHost(extensions: readonly Extension[], deps: HostDeps): Host {
const tools = new Map<string, ToolContract>();
const providers = new Map<string, ProviderContract>();
const authProviders = new Map<string, AuthContract>();
const scheduledJobs: ScheduledJob[] = [];
const migrations: string[] = [];
const disabled: DisabledExtension[] = [];
const activated: Extension[] = [];
const ordered = resolveActivationOrder(extensions.map((e) => e.manifest));
const extById = new Map<string, Extension>();
for (const ext of extensions) {
extById.set(ext.manifest.id, ext);
}
const compatible: Extension[] = [];
for (const m of ordered) {
const ext = extById.get(m.id);
if (ext === undefined) continue;
if (isApiVersionCompatible(m.apiVersion, KERNEL_API_VERSION)) {
compatible.push(ext);
} else {
disabled.push({
manifest: m,
reason: `apiVersion "${m.apiVersion}" is incompatible with kernel API ${KERNEL_API_VERSION}`,
});
deps.logger.warn(`Extension "${m.id}" disabled: apiVersion incompatible`);
}
}
for (const ext of compatible) {
const extMigrations = ext.manifest.contributes?.migrations;
if (extMigrations) {
for (const migration of extMigrations) {
migrations.push(migration);
}
}
}
function buildHostAPI(): HostAPI {
return {
defineTool(tool: ToolContract) {
tools.set(tool.name, tool);
},
defineProvider(provider: ProviderContract) {
providers.set(provider.id, provider);
},
defineAuth(auth: AuthContract) {
authProviders.set(auth.id, auth);
},
on<TPayload>(hook: EventHookDescriptor<TPayload>, handler: EventHandler<TPayload>) {
return deps.bus.on(hook, handler);
},
addFilter<TValue>(hook: FilterDescriptor<TValue>, fn: FilterHandler<TValue>) {
return deps.bus.addFilter(hook, fn);
},
provideService<T>(handle: ServiceHandle<T>, impl: T) {
deps.bus.provideService(handle, impl);
},
getService<T>(handle: ServiceHandle<T>): T {
return deps.bus.getService(handle);
},
storage(namespace: string): StorageNamespace {
return deps.storageFactory(namespace);
},
config: deps.config,
secrets: deps.secrets,
permissions: deps.permissions,
events: deps.events,
logger: deps.logger,
getProviders() {
return providers;
},
getTools() {
return tools;
},
scheduler: {
register(job: ScheduledJob) {
scheduledJobs.push(job);
deps.scheduler.register(job);
},
},
};
}
return {
async activate() {
for (const ext of compatible) {
try {
await ext.activate(buildHostAPI());
activated.push(ext);
deps.logger.info(`Extension "${ext.manifest.id}" activated`);
} catch (err) {
disabled.push({
manifest: ext.manifest,
reason: `Activation failed: ${err instanceof Error ? err.message : String(err)}`,
});
deps.logger.error(`Extension "${ext.manifest.id}" failed to activate`, err);
}
}
},
async deactivate() {
for (let i = activated.length - 1; i >= 0; i--) {
const ext = activated[i];
if (ext === undefined || ext.deactivate === undefined) continue;
try {
await ext.deactivate();
} catch (err) {
deps.logger.error(`Extension "${ext.manifest.id}" failed to deactivate`, err);
}
}
},
getTools() {
return tools;
},
getTool(name: string) {
return tools.get(name);
},
getProviders() {
return providers;
},
getProvider(id: string) {
return providers.get(id);
},
getAuthProviders() {
return authProviders;
},
getAuthProvider(id: string) {
return authProviders.get(id);
},
getScheduledJobs() {
return scheduledJobs;
},
getMigrations() {
return migrations;
},
getDisabled() {
return disabled;
},
};
}
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