serverless-spy
Version:
CDK-based library for writing elegant integration tests on AWS serverless architecture and an additional web console to monitor events in real time.
50 lines (49 loc) • 1.39 kB
JavaScript
export class EndpointCache {
constructor({ size, params }) {
this.data = new Map();
this.parameters = [];
this.capacity = size ?? 50;
if (params) {
this.parameters = params;
}
}
get(endpointParams, resolver) {
const key = this.hash(endpointParams);
if (key === false) {
return resolver();
}
if (!this.data.has(key)) {
if (this.data.size > this.capacity + 10) {
const keys = this.data.keys();
let i = 0;
while (true) {
const { value, done } = keys.next();
this.data.delete(value);
if (done || ++i > 10) {
break;
}
}
}
this.data.set(key, resolver());
}
return this.data.get(key);
}
size() {
return this.data.size;
}
hash(endpointParams) {
let buffer = "";
const { parameters } = this;
if (parameters.length === 0) {
return false;
}
for (const param of parameters) {
const val = String(endpointParams[param] ?? "");
if (val.includes("|;")) {
return false;
}
buffer += val + "|;";
}
return buffer;
}
}