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zlib: move, rename, document internal params() cb #23187

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zlib: move, rename, document internal params() cb #23187

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28 changes: 16 additions & 12 deletions lib/zlib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -156,17 +156,6 @@ function zlibOnError(message, errno) {
self.emit('error', error);
}

function flushCallback(level, strategy, callback) {
if (!this._handle)
assert(false, 'zlib binding closed');
this._handle.params(level, strategy);
if (!this._hadError) {
this._level = level;
this._strategy = strategy;
if (callback) callback();
}
}

// 1. Returns false for undefined and NaN
// 2. Returns true for finite numbers
// 3. Throws ERR_INVALID_ARG_TYPE for non-numbers
Expand Down Expand Up @@ -352,13 +341,28 @@ Object.defineProperty(Zlib.prototype, 'bytesRead', {
}
});

// This callback is used by `.params()` to wait until a full flush happened
// before adjusting the parameters. In particular, the call to the native
// `params()` function should not happen while a write is currently in progress
// on the threadpool.
function paramsAfterFlushCallback(level, strategy, callback) {
if (!this._handle)
assert(false, 'zlib binding closed');
this._handle.params(level, strategy);
if (!this._hadError) {
this._level = level;
this._strategy = strategy;
if (callback) callback();
}
}

Zlib.prototype.params = function params(level, strategy, callback) {
checkRangesOrGetDefault(level, 'level', Z_MIN_LEVEL, Z_MAX_LEVEL);
checkRangesOrGetDefault(strategy, 'strategy', Z_DEFAULT_STRATEGY, Z_FIXED);

if (this._level !== level || this._strategy !== strategy) {
this.flush(Z_SYNC_FLUSH,
flushCallback.bind(this, level, strategy, callback));
paramsAfterFlushCallback.bind(this, level, strategy, callback));
} else {
process.nextTick(callback);
}
Expand Down