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feat(core/server): read config from environment

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cha0s 2022-02-28 02:16:37 -06:00
parent f98ef90f6f
commit 8ed96484b9
1 changed files with 40 additions and 0 deletions
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40
packages/core/src/server/flecks.js
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@ -32,6 +32,46 @@ export default class ServerFlecks extends Flecks {
resolver = {},
rcs = {},
} = options;
const keys = Object.keys(process.env);
// Reverse-sorting means e.g. `@flecks/core/server` comes before `@flecks/core`.
// We want to select the most specific match.
//
// `FLECKS_ENV_FLECKS_CORE_SERVER_VARIABLE` is ambiguous as it can equate to both:
// - `flecks.set('@flecks/core.server.variable');`
// - `flecks.set('@flecks/core/server.variable');`
//
// The latter will take precedence.
const seen = [];
Object.keys(resolver)
.sort((l, r) => (l < r ? 1 : -1))
.forEach((fleck) => {
const prefix = `FLECKS_ENV_${
fleck
// - `@flecks/core` -> `FLECKS_CORE`
.replace(/[^a-zA-Z0-9]/g, '_')
.replace(/_*(.*)_*/, '$1')
.toUpperCase()
}`;
keys
.filter((key) => key.startsWith(`${prefix}_`) && -1 === seen.indexOf(key))
.map((key) => {
seen.push(key);
debug('reading environment from %s...', key);
return [key, process.env[key]];
})
.map(([key, value]) => [key.slice(prefix.length + 1), value])
.map(([subkey, value]) => [subkey.split('_'), value])
.forEach(([path, jsonOrString]) => {
try {
this.set([fleck, ...path], JSON.parse(jsonOrString));
debug('read (%s) as JSON', jsonOrString);
}
catch (error) {
this.set([fleck, ...path], jsonOrString);
debug('read (%s) as string', jsonOrString);
}
});
});
this.resolver = resolver;
this.rcs = rcs;
}