SystemStorageTable returns Empty on devices attempted

[csucbg]

Every switch we have attempted to use the SystemStorageTable to interrogate has returned an empty table. This appears to be because the YAML (https://github.com/Juniper/py-junos-eznc/tree/master/lib/jnpr/junos/op/systemstorage.yml) does not take into account that the filesystem information is returned per RE by a lot of switches.

Eg the supplied YAML works with an MX104 which repliex in the following format:

<rpc-reply xmlns:junos="http://xml.juniper.net/junos/20.4R0/junos">
    <system-storage-information junos:style="brief">
        <filesystem>
            <filesystem-name>/dev/da0s1a</filesystem-name>
            <total-blocks junos:format="904M">1850456</total-blocks>
            <used-blocks junos:format="314M">642792</used-blocks>
            <available-blocks junos:format="517M">1059628</available-blocks>
            <used-percent> 38</used-percent>
            <mounted-on>/</mounted-on>
        </filesystem>
   ....

It does not work with a QFX which replies in this format:

<rpc-reply xmlns:junos="http://xml.juniper.net/junos/22.2R0/junos">
  <multi-routing-engine-results xmlns:junos="http://xml.juniper.net/junos/*/junos">
    <multi-routing-engine-item>
      <re-name>localre</re-name>
      <system-storage-information junos:style="brief">
        <filesystem>
         <filesystem-name>/dev/gpt/junos</filesystem-name>
         <total-blocks junos:format="6.0G">12540924</total-blocks>
         <used-blocks junos:format="1.1G">2315388</used-blocks>
         <available-blocks junos:format="4.4G">9222264</available-blocks>
         <used-percent> 20</used-percent>
         <mounted-on>/.mount</mounted-on>
       </filesystem>
   ....

I have written the following naive modification as a suggested fix. It works on EX3400s (standalone and stacked), a QFX5120 series, as well as an MX104. I'm sure someone can make it better for integration :) It might be hard to change without breaking working downstream code, but I'll leave that to the pros!

---
SystemStorageTable:
  rpc: get-system-storage
  item: //multi-routing-engine-item | //rpc-reply/system-storage-information
  key: re-name | Null
  view: SystemStorageView

SystemStorageView:
  fields:
    re-name: re-name
    filesystems: _FsTable

_FsTable:
  item: system-storage-information/filesystem | //rpc-reply/system-storage-information/filesystem
  key: filesystem-name
  view: _FsView

_FsView:
  fields:
    name: filesystem-name
    total_blocks: total-blocks
    used_blocks: used-blocks
    available_blocks: available-blocks
    used_percent: used-percent
    mounted_on: mounted-on