error after hard reboot

I’m using node-persist on a raspberry pi where there is no on/off button to gracefully stop or reboot the machine. Therefore, I pull the usb (power) cable and plug it back in. This works for most applications, but I encounter the following problem in one of my apps:

I’m initializing the storage module synchronically like this:

storage.initSync({ttl: 8 * 60 * 60 * 1000})

Usually, after a hard reboot I get this stack trace in my log file:

TypeError: Cannot read property 'key' of undefined
    at LocalStorage.parseFileSync (/home/pi/lavazza/dash-button/node_modules/node-persist/src/local-storage.js:638:24)
    at LocalStorage.parseStorageDirSync (/home/pi/lavazza/dash-button/node_modules/node-persist/src/local-storage.js:602:26)
    at LocalStorage.initSync (/home/pi/lavazza/dash-button/node_modules/node-persist/src/local-storage.js:148:14)
    at Object.nodePersist.initSync (/home/pi/lavazza/dash-button/node_modules/node-persist/src/node-persist.js:37:32)
    at Object.<anonymous> (/home/pi/lavazza/dash-button/index.js:15:9)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)

Line 15 in file index.js corresponds to the storage.initSync I quoted above.

Deleting the .node-persist directory resolves the problem. So this is my workaround for the time being, but it would be cleaner if I wouldn’t have to. Do you have an idea why this happens?

[akhoury]

i think i do, something is adding a non-parseable file in that directory, i think these 2 issues are related: can you add a logging statement, as my instructions in this comment https://github.com/simonlast/node-persist/issues/72#issuecomment-264754099

[jfix]

Yes, I will do that, you’re right.