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JavaScript parser passes all tests when returning strings.

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JS is still way too slow for large mb replies.  Hiredis is fast for strings of large  replies,
but slow for buffers.
This commit is contained in:
Matt Ranney
2010-12-07 00:23:31 -08:00
parent b907364573
commit 36c40ee03d
3 changed files with 84 additions and 36 deletions
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53
lib/parser/javascript.js
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@@ -18,10 +18,10 @@ util.inherits(RedisReplyParser, events.EventEmitter);
exports.Parser = RedisReplyParser;
// Buffer.toString() is quite slow for small strings
function small_toString(buf) {
var tmp = "", i, il;
function small_toString(buf, len) {
var tmp = "", i;
for (i = 0, il = buf.end; i < il; i += 1) {
for (i = 0; i < len; i += 1) {
tmp += String.fromCharCode(buf[i]);
}
@@ -33,7 +33,8 @@ RedisReplyParser.prototype.reset = function () {
this.state = "type";
this.return_buffer = new Buffer(16384); // for holding replies, might grow
this.tmp_buffer = new Buffer(128); // for holding size fields
this.return_string = "";
this.tmp_string = ""; // for holding size fields
this.multi_bulk_length = 0;
this.multi_bulk_replies = null;
@@ -64,22 +65,25 @@ RedisReplyParser.prototype.execute = function (incoming_buf) {
case 43: // +
this.state = "single line";
this.return_buffer.end = 0;
this.return_string = "";
break;
case 42: // *
this.state = "multi bulk count";
this.tmp_buffer.end = 0;
this.tmp_string = "";
break;
case 58: // :
this.state = "integer line";
this.return_buffer.end = 0;
this.return_string = "";
break;
case 36: // $
this.state = "bulk length";
this.tmp_buffer.end = 0;
this.tmp_string = "";
break;
case 45: // -
this.state = "error line";
this.return_buffer.end = 0;
this.return_string = "";
break;
default:
this.state = "unknown type";
@@ -87,7 +91,7 @@ RedisReplyParser.prototype.execute = function (incoming_buf) {
break;
case "integer line":
if (incoming_buf[pos] === 13) {
this.send_reply(+small_toString(this.return_buffer));
this.send_reply(+small_toString(this.return_buffer, this.return_buffer.end));
this.state = "final lf";
} else {
this.return_buffer[this.return_buffer.end] = incoming_buf[pos];
@@ -107,18 +111,10 @@ RedisReplyParser.prototype.execute = function (incoming_buf) {
break;
case "single line":
if (incoming_buf[pos] === 13) {
if (this.return_buffer.end > 10) {
bd_str = this.return_buffer.toString("utf8", 0, this.return_buffer.end);
} else {
bd_str = small_toString(this.return_buffer);
}
this.send_reply(bd_str);
this.send_reply(this.return_string);
this.state = "final lf";
} else {
this.return_buffer[this.return_buffer.end] = incoming_buf[pos];
this.return_buffer.end += 1;
// TODO - check for return_buffer overflow and then grow, copy, continue, and drink.
this.return_string += String.fromCharCode(incoming_buf[pos]);
}
pos += 1;
break;
@@ -126,8 +122,7 @@ RedisReplyParser.prototype.execute = function (incoming_buf) {
if (incoming_buf[pos] === 13) { // \r
this.state = "multi bulk count lf";
} else {
this.tmp_buffer[this.tmp_buffer.end] = incoming_buf[pos];
this.tmp_buffer.end += 1;
this.tmp_string += String.fromCharCode(incoming_buf[pos]);
}
pos += 1;
break;
@@ -137,7 +132,7 @@ RedisReplyParser.prototype.execute = function (incoming_buf) {
this.multi_bulk_nested_length = this.multi_bulk_length;
this.multi_bulk_nested_replies = this.multi_bulk_replies;
}
this.multi_bulk_length = +small_toString(this.tmp_buffer);
this.multi_bulk_length = +this.tmp_string;
this.multi_bulk_replies = [];
this.state = "type";
if (this.multi_bulk_length < 0) {
@@ -157,14 +152,13 @@ RedisReplyParser.prototype.execute = function (incoming_buf) {
if (incoming_buf[pos] === 13) { // \r
this.state = "bulk lf";
} else {
this.tmp_buffer[this.tmp_buffer.end] = incoming_buf[pos];
this.tmp_buffer.end += 1;
this.tmp_string += String.fromCharCode(incoming_buf[pos]);
}
pos += 1;
break;
case "bulk lf":
if (incoming_buf[pos] === 10) { // \n
this.bulk_length = +small_toString(this.tmp_buffer);
this.bulk_length = +this.tmp_string;
if (this.bulk_length === -1) {
this.send_reply(null);
this.state = "type";
@@ -251,22 +245,13 @@ RedisReplyParser.prototype.send_error = function (reply) {
RedisReplyParser.prototype.send_reply = function (reply) {
if (this.multi_bulk_length > 0 || this.multi_bulk_nested_length > 0) {
if (!this.options.return_buffers && Buffer.isBuffer(reply)) {
if (reply.end > 10) {
this.add_multi_bulk_reply(reply.toString());
} else {
this.add_multi_bulk_reply(small_toString(reply));
}
this.add_multi_bulk_reply(reply.toString("utf8"));
} else {
this.add_multi_bulk_reply(reply);
}
} else {
if (!this.options.return_buffers && Buffer.isBuffer(reply)) {
console.log("converting buffer to string of len " + reply.end + ", " + util.inspect(reply));
if (reply.length > 10) {
this.emit("reply", reply.toString());
} else {
this.emit("reply", small_toString(reply));
}
this.emit("reply", reply.toString("utf8"));
} else {
this.emit("reply", reply);
}