nicolargo/glances · error · HTTPException

Cannot get plugin ( )

Error message

Cannot get plugin {plugin} ({str(e)})

What it means

Raised when a known plugin's get_api() call fails, returned as HTTP 404 with the plugin name and underlying exception. The plugin passed availability checks, so this is an internal data-fetch failure, not an unknown-plugin error (which would be HTTP 400).

Solutions

1. Read the embedded exception in the 404 body and the server log to identify the cause
2. Retry the request — transient collection errors often clear on the next refresh cycle
3. Install missing optional dependencies for the plugin (e.g., batinfo, pynvml)
4. If persistent, disable the plugin with --disable-plugin and report the traceback upstream

plugins = httpx.get(f'{BASE}/api/4/plugins').json()
assert plugin in plugins, f'{plugin} not available (have: {plugins})'

for attempt in range(3):
    r = httpx.get(f'{BASE}/api/4/{plugin}', timeout=10)
    if r.status_code == 200:
        break
    time.sleep(refresh_interval)
else:
    log.error(f'plugin {plugin} failed: {r.text}')

When it happens

Trigger: GET /api/4/<plugin> where the plugin is in plugins_list but get_api() raises during stats refresh or serialization — e.g., sensors/gpu plugin failing to read a device file mid-poll.

Common situations: Transient hardware sensor read failures, Snap confinement blocking /sys access, or a plugin whose optional dependency is missing at data-collection time.

Related errors

• Cannot get help view data
• Cannot get args item
• Cannot get args ( )
• Cannot get config section
• Cannot get config ( )

AI-assisted analysis of nicolargo/glances@a240d8dfb3 (2026-08-27). Data as JSON: /api/errors/4d843ec271a7cb73. Report an issue: GitHub.

Appendix: source

Thrown at glances/outputs/glances_restful_api.py:1005

    def _api(self, plugin: str):
        """Glances API RESTful implementation.

        Return the JSON representation of a given plugin
        HTTP/200 if OK
        HTTP/400 if plugin is not found
        HTTP/404 if others error
        """
        self._check_if_plugin_available(plugin)

        # Update the stat
        self.__update_stats(get_plugin_dependencies(plugin))

        try:
            # Get the RAW value of the stat ID
            statval = self.stats.get_plugin(plugin).get_api()
        except Exception as e:
            raise HTTPException(status.HTTP_404_NOT_FOUND, f"Cannot get plugin {plugin} ({str(e)})")

        return GlancesJSONResponse(statval)

    def _check_if_plugin_available(self, plugin: str) -> None:
        if plugin in self.plugins_list:
            return

        raise HTTPException(
            status.HTTP_400_BAD_REQUEST, f"Unknown plugin {plugin} (available plugins: {self.plugins_list})"
        )

    def _api_top(self, plugin: str, nb: int = 0):
        """Glances API RESTful implementation.

        Return the JSON representation of a given plugin limited to the top nb items.
        It is used to reduce the payload of the HTTP response (example: processlist).

        HTTP/200 if OK

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