javascript - RangeError: call stack exceed on async .eachSeries -

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at last, actual stack overflow error reported on stackoverflow!

i following error in code below:

var m = patha.substr(-(pathb.length)); // var                                                ^ rangeerror: maximum call stack size exceeded

i'm sure answer reported here, towards bottom:

https://github.com/caolan/async/issues/75

however, don't understand how fix code. not calling sync functions inside async functions, far know. can clarify have fix code?

i'm iterating on cross-product of result-set concatenate path strings 1 substring of other.

var = 0;     async.eachseries(results.rows, function (r, next2a) {         var patha = results.rows[i].id_path;         var j = 0;         async.eachseries(results.rows, function (r2, next1a) {             var pathb = results.rows[j].id_path;             //check i=j             if (!(i == j)) {                 var m = patha.substr(-(pathb.length)); // var m = (patha || '').substr(-((pathb) ? pathb.length : 0));                 if ((m == pathb) && (patha.length > pathb.length)) {                     logger.log('debug', (pathb + ' => ' + patha));                     conn.query("update user_token_details set id_l1=$1, id_l2=$2, id_l3=$3, id_l4=$4,id_l5=$5,id_path2=$9, id_path=$6 token_uuid=$7 , user_uuid=$8",                         [results.rows[i].id_l1, results.rows[i].id_l2, results.rows[i].id_l3, results.rows[i].id_l4, results.rows[i].id_l5, results.rows[i].id_path,                             results.rows[j].token_uuid, user_uuid, results.rows[j].id_path],                         function (error, result) {                             if (error) {                                 throw error;                             }                             j++;                             next1a();                          })                 } else {                     j++;                     next1a();                 }             } else {                 j++;                 next1a();             }           }, function () {             i++;             next2a();         });       }, function (err) { });

here form of spaghetti:

var = [0, 1, 2, 3, 4...300]; async.eachseries(a, function (a, next_a) {      async.eachseries(a, function (b, next_b) {        // "range error: maximum call stack size exceeded"         dosomethingasync(a,b, function () {         next_a();         });      }, function (err) {         next_b();     })  }, function (err) {     // resume })

the problem async.eachseries behaves asynchronously if callback inside called asynchronously. in case, last 2 calls next1a not performing query, occur synchronously, , extend call stack. in case, iterating enough hit max stack depth. simplest fix call next1a asynchronously.

replace each instance of

next1a();

with

setimmediate(next1a);

except 1 async because of query. note while process.nexttick(next1a) work, has potential block event loop processing other tasks. because process.nexttick queues callback microtask, whereas setimmediate queues callback macrotask.


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