Web UI causes an error

[theposs101]

System information

• Have I written custom code (as opposed to using zenbot vanilla): No

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Ubuntu 16.04

• Zenbot version (commit ref, or version): 4.1.0

• Zenbot branch: unstable

• NodeJS version: 10.0.0

• Python version (when using a python script): N/A

• Exact command to reproduce (include everything): ./zenbot.sh trade --paper --order_type="taker" --conf /root/configs/zenbot/btc-usdt-conf.js --period=55m --trend_ema=34 --neutral_rate=auto --currency_capital 100 --asset_capital 0.08

• Did I make any changes to conf-sample.js?: Yes, https://pastebin.com/iUqvQ7x9

Describe the problem

Zenbot throws an error when trying to access the Web UI. It does not crash the bot, but freezes for about 15 seconds and then throws an error when you load the Web UI, and in the bot log.

Source code / Error logs

RangeError: Invalid string length
    at JSON.stringify (<anonymous>)
    at /root/zenbot/extensions/output/api.js:37:35
    at Layer.handle [as handle_request] (/root/zenbot/node_modules/express/lib/router/layer.js:95:5)
    at next (/root/zenbot/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/root/zenbot/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/root/zenbot/node_modules/express/lib/router/layer.js:95:5)
    at /root/zenbot/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/root/zenbot/node_modules/express/lib/router/index.js:335:12)
    at next (/root/zenbot/node_modules/express/lib/router/index.js:275:10)
    at expressInit (/root/zenbot/node_modules/express/lib/middleware/init.js:40:5)

[theposs101]

Also get this error about 30 seconds after the first error

RangeError: Invalid string length
    at JSON.stringify (<anonymous>)
    at /root/zenbot/extensions/output/api.js:37:35
    at Layer.handle [as handle_request] (/root/zenbot/node_modules/express/lib/router/layer.js:95:5)
    at next (/root/zenbot/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/root/zenbot/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/root/zenbot/node_modules/express/lib/router/layer.js:95:5)
    at /root/zenbot/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/root/zenbot/node_modules/express/lib/router/index.js:335:12)
    at next (/root/zenbot/node_modules/express/lib/router/index.js:275:10)
    at expressInit (/root/zenbot/node_modules/express/lib/middleware/init.js:40:5)
An error occurred { Error: binance GET https://api.binance.com/api/v1/aggTrades?symbol=BTCUSDT&startTime=1525197724466&endTime=1525201324466 request timed out (10000 ms)
    at timeout.catch.e (/root/zenbot/node_modules/ccxt/js/base/Exchange.js:326:27)
    at process._tickCallback (internal/process/next_tick.js:178:7) constructor: [Function: RequestTimeout] }

[defkev]

Just a wild guess but RangeError: Invalid string length could be the system running out of memory will deep cloning the config object.

[theposs101]

Tried adding --max-old-space-size=8192 to the script, made no difference. Still getting the same error when I try to access the web UI,

[theposs101]

Weird, removing —period from the startup script lets the web ui open...

I’m gonna close for now.

[defkev]

Just tried this on my dev box using current unstable and i am not able to reproduce it, even after upgrading to node 10

So unless you got anything fancy in your btc-usdt-conf.js overrides i still suspect you are running OOM, especially since the selector returns quite a number of trades, around 190k 😮

[theposs101]

Yeah, --period=55m was causing my error. Once I removed that from my startup script, I had no issues.