I did a quick search for "is not a defined function". That message appears once in https://go.dev/src/text/template/exec.go. It's triggered when findFunction() fails while executing a template.
Hope that's of some use. On Wednesday, October 19, 2022 at 8:20:46 AM UTC-4 rit...@ext.dunzo.in wrote: > > We are facing a strange issue within one of our services where randomly > one of the docker containers in production out of (N, N>50) starts > randomly failing on an API while trying to execute a golang template with > an error *"Err: template: <template name>: executing \"<template name>\" > at len: \"len\" is not a defined function". *`len` is a builtin function > within golang so am stumped why this error comes. Some more context > > > - *Golang Version: 1.15* > - The same Pod was serving this API and executing the template > correctly before this issue started coming > - Parsing the template works fine, only executing fails. We are > parsing and executing in sequence. > - After this error was encountered first, all subsequent API calls to > the same container failed with the same error > - The same API on all other containers works perfectly fine. We > removed the container from serving prod traffic, and this issue disappeared > - This is the second time the issue is happening, first time we > restarted the container and hence weren't able to debug much > - Binary is stripped of symbol tables and ptrace is not enabled > > We have the container running (not serving prod traffic) so if there are > any hints on how to debug this issue would appreciate. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/5f252adb-4d0c-4d86-bc61-8b3a47be68d9n%40googlegroups.com.
