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import console from "node:console";
const DEBUG = getEnv("CACHE_DEBUG", false) === "true";
//~ public
export const cacheGetVersion = () => {
return getPackageJson()?.version;
}
export const cacheGetProjectMetadata = key => {
return getPackageJson()?.metadata[key];
}
export const cacheGetProjectHomepage = () => {
return getPackageJson()?.homepage;
}
export const cacheGetProjectBugsUrl = () => {
return getPackageJson()?.bugs?.url;
}
//~ private
class MemoryCache {
/**
* handle app instance in-memory objects
*/
}
MemoryCache.packageJson = null;
MemoryCache.ttlObject = [/* { key, ttl, value }, { key, ttl, value } ... */];
//~ packageJson
const getPackageJson = () => {
if (MemoryCache.packageJson === null) {// cache miss
DEBUG && console.log("cache miss:packageJson")
MemoryCache.packageJson = getPackageJsonContent();
}
return MemoryCache.packageJson;
}
//~ ttlObject
const nowEpochSec = () => {
const now = new Date()
const utcMsSinceEpoch = now.getTime() + (now.getTimezoneOffset() * 60 * 1000)
return Math.round(utcMsSinceEpoch / 1000)
}
const evictDeprecatedTtlObject = () => {
MemoryCache.ttlObject = MemoryCache.ttlObject.filter(ttlObject => ttlObject.ttl > nowEpochSec());
}
export const cacheEvictKey = key => {
DEBUG && console.log(`cache::cacheEvictKey ${key}`);
MemoryCache.ttlObject = MemoryCache.ttlObject.filter(ttlObject => ttlObject.key !== key);
}
export const cacheGetTtlObject = (key, ttlSecond, objectProviderFunction) => {
return new Promise((resolve, reject) => {
evictDeprecatedTtlObject();
const ttlObjects = MemoryCache.ttlObject.filter(ttlObject => ttlObject.key === key)
if (isSet(ttlObjects) && ttlObjects.length === 1) {
return resolve(ttlObjects[0].value);
}
cacheEvictKey(key);
// DEBUG && console.log(`cache miss:getTtlObject ${key}`);
const ttl = nowEpochSec() + ttlSecond;
objectProviderFunction()
.then(value => {
MemoryCache.ttlObject.push({key, ttl, value})
resolve(value);
})
.catch(reject);
});
} |