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Copy pathminigraf.js
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67 lines (60 loc) · 2.53 KB
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'use strict'
// Package entry point: the native classes from index.js,
// plus JavaScript iteration over cursors and fact logs. (napi's own iterator
// support cannot throw, so a failed batch read would end the loop silently.)
const binding = require('./index.js')
const BATCH = 1000
/** Rows of the answer (decoded like `execute()`'s `results`), read in batches. */
binding.Cursor.prototype[Symbol.iterator] = function* rows() {
for (let batch; (batch = this.nextBatch(BATCH)) !== null; ) {
yield* JSON.parse(batch)
}
}
/** Fact records, read in batches. */
binding.FactLog.prototype[Symbol.iterator] = function* records() {
for (let batch; (batch = this.nextBatch(BATCH)) !== null; ) {
yield* batch
}
}
// A JS `Set` binds as the typed form `{ type: 'set', value: [...] }`
// (minigraf#316), in a typed set's elements too, so a set inside a set
// reaches the native reader and fails with API-021.
function setForm(v) {
if (v instanceof Set) return { type: 'set', value: Array.from(v, setForm) }
if (v !== null && typeof v === 'object' && v.type === 'set' && Array.isArray(v.value)) {
return { type: 'set', value: v.value.map(setForm) }
}
return v
}
function bindings(b) {
if (b === null || typeof b !== 'object' || Array.isArray(b)) return b
// A null prototype keeps a slot named __proto__ an own property.
const out = Object.create(null)
for (const [name, v] of Object.entries(b)) out[name] = setForm(v)
return out
}
for (const method of ['execute', 'query']) {
const native = binding.PreparedQuery.prototype[method]
binding.PreparedQuery.prototype[method] = function (b) {
return native.call(this, bindings(b))
}
}
// Assigned one by one so that ESM `import { ... }` can see the names.
module.exports.Cursor = binding.Cursor
module.exports.FactLog = binding.FactLog
module.exports.LogWriter = binding.LogWriter
module.exports.MiniGrafDb = binding.MiniGrafDb
module.exports.PreparedQuery = binding.PreparedQuery
module.exports.WriteTransaction = binding.WriteTransaction
/** `validTo` of a fact that is valid forever. */
module.exports.VALID_TIME_FOREVER = 9223372036854775807n
/**
* `walCheckpointThreshold` that never checkpoints: no automatic checkpoint and
* none when the handle closes. Call `checkpoint()` yourself.
*/
module.exports.WAL_CHECKPOINT_NEVER = Number.MAX_SAFE_INTEGER
/**
* The override list that applies when `allowOverrides` is absent: the Rust
* `Overridable::DEFAULTS`, read from the core library (minigraf#872).
*/
module.exports.OVERRIDABLE_DEFAULTS = Object.freeze(binding.overridableDefaults())