nchan_subscriber_info_string
The `nchan_subscriber_info_string` directive configures a custom string to be included with subscriber information during a pub/sub interaction.
Description
The nchan_subscriber_info_string directive is used to define a custom string that accompanies subscriber information when a client subscribes to a channel using Nchan's pub/sub features. This string can contain various pieces of information such as client identifiers or other metadata, which can be useful for tracking subscriber characteristics or for logging purposes. The directive takes a single argument that should be a valid string, and can include Nginx variables to dynamically insert contextual information into the string. This configuration enables flexibility in how subscriber data is formatted and captured, and can enhance debugging or operational insights for applications using the Nchan module.
When using this directive, it is important to note that the specified data will be attached to subscriber information when certain events occur, such as subscriptions being made or notifications being sent to subscribers. The nchan_subscriber_info_string value can be evaluated in the context of the location or server block where it is defined, which allows for different configurations based on the location of the request within the Nginx server. This is particularly beneficial in applications where multiple channels or endpoints are being utilized, since each could potentially provide unique metadata through their respective configurations.
Config Example
server {
location /subscribe {
nchan_subscriber_info_string "client_id=$remote_addr";
nchan_subscribe; // additional configurations
}
}Ensure the string argument is correctly formatted; missing opening or closing quotes will cause configuration errors.
Careful with Nginx variables used in the string; ensure they are accessible in the context where the directive is used.