My actual question: Is this the fastest way I can accomplish my goal?
Thanks.
As part of a work project I have written a converter function that takes a
JSON string or object as input and returns a key:value space separated
string. The goal is to do this transformation as quickly as possible, the
system this will be part of is supposed to handle about 20k to 40k
transactions per second. Although not all transactions will need the
transformation.
The case is that data flow had this key:value comma separated format
originally. The upstream components and my component have changed the
format to JSON, but the downstream component has not. Therefore I have do a
conversion for them before sending it down. I dont agree with that decision
but it is what it is.
There are a couple of quirks that I had to deal with.
The JSON contains some values that are base64 encoded and then wrapped like
this:
"key":{"enc":"base64","value":"base64value"}
which would have to be converted to:
key:base64value
The JSON also contains some arrays of integers:
"arr":[1,2,3,4,5,6]
which would have to be converted to:
arr:1,2,3,4,5,6
so given this as input:
{
"timestamp":"1364911321",
"sip":3470129951,
{
"enc":"base64",
"value":"base64value"
},
"ar":[1,2,3,4,5,6]
}
I want this ouput:
timestamp:1364911321 sip:3470129951 cliid:base64value ar:1,2,3,4,5,6
This is my first pass at this and would appreciate your input.
/**
*
* Class to handler converting JSON objects and Strings to
* Repper formatted strings.
*
* All quotes, braces are removed
* All commas are converted to spaces
*
* TODO handle arrays wrapped in []
*/
var JSONToRepper = function () {}
JSONToRepper.replacer = function(key, value) {
/*
Look for wrapped values and return only the base64 value for
the given key
*/
if('undefined' !== typeof value.enc && value.enc === 'base64'){
return value.value;
} else if (typeof value === 'number' && !isFinite(value)) {
return String(value);
}
return value;
}
/**
* @param String|Object json
* @return String
*
* Can accept a JSON string or object and will return a string in
* Repper format.
*/
JSONToRepper.prototype.convert = function(json) {
var _this = this;
if('object' === typeof json){
json = JSON.stringify(json, _this.replacer);
}
/*
* Remove all braces {} and quotes ""
* Replace all commas with except when they appear inside []
* Replace all brackets []
*/
return json.replace(/[\"|\{|\}]/g,
'').replace(/,(?=[^\]]*(?:\[|$))/g, ' ').replace(/\[|\]/g, '');
}
exports.JSONToRepper = new JSONToRepper();
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