/
dynamic.ts
55 lines (51 loc) · 1.74 KB
/
dynamic.ts
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import type { Name } from "@ndn/packet";
import { assert } from "@ndn/util";
import type { DataStore } from "../data-store";
import type { PrefixRegController } from "./types";
/**
* Register prefixes derived from Data names.
* @param transform - Function that accepts Data name and returns registered prefix name.
* It must be a pure function i.e. returns the same value for the same argument.
*
* @remarks
* Warning: this may misbehave when {@link DataStore.InsertOptions.expireTime} is being used.
*/
export function PrefixRegDynamic(transform: (name: Name) => Name): PrefixRegController {
return (store, face) => {
const handleInsertName = (name: Name) => {
const prefix = transform(name);
face.addRoute(prefix);
};
const handleInsert = ({ name }: DataStore.RecordEvent) => {
handleInsertName(name);
};
const handleDelete = ({ name }: DataStore.RecordEvent) => {
const prefix = transform(name);
face.removeRoute(prefix);
};
void store.mutex.use(async () => {
for await (const name of store.listNames()) {
handleInsertName(name);
}
});
store.addEventListener("insert", handleInsert);
store.addEventListener("delete", handleDelete);
return {
close() {
store.removeEventListener("insert", handleInsert);
store.removeEventListener("delete", handleDelete);
},
};
};
}
/**
* Register prefixes k components shorter than Data names.
* @param k - Number of final name components to strip.
*
* @remarks
* Warning: this may misbehave when {@link DataStore.InsertOptions.expireTime} is being used.
*/
export function PrefixRegShorter(k: number): PrefixRegController {
assert(k >= 0);
return PrefixRegDynamic((name) => name.getPrefix(-k));
}