update download uses lot of cpu, and may lost connection, and error not catchable

[zh99998]

• Version: 10.8.1

• Target: win32

1. when downloading updates, it uses lots of CPU.
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(when not in update, it only use < 10%).

2. update may lost connection and get a incomplete package, then throw SHA2 checksum error. my service is over https, and a complete package is always correct. but they often download a incomplete one. there is apart of my nginx log:
   Imgur

my app total length is 35925496, but he failed 2 times before got a complete one.
I'm sure he is not close my app manually, he's waiting for update, and got a sha2 checksum error.

his network to my server works well, when using wget or browser, download will always complete.

3. the sha2 checksum error is not catchable.
   I've listened autoUpdater.on("error") event, but still throws a error window.

Imgur

[develar]

We will soon use chrome API to download instead of node. Please see #1024

I have the same issue. I think it's because sha2 mismatch throws an exception from within a promise here. Wouldn't it make more sense to use the error callback?

[develar]

Fixed in electron-auto-updater 0.8.2