Question: Conventions to overwrite nested values with env vars

[josecelano]

Hello, I'm migrating to Figment in one of the projects I'm contributing to.

I have this toml file:

announce_interval = 120
db_driver = "Sqlite3"
db_path = "./storage/tracker/lib/database/sqlite3.db"
external_ip = "0.0.0.0"
inactive_peer_cleanup_interval = 600
log_level = "info"
max_peer_timeout = 900
min_announce_interval = 120
mode = "public"
on_reverse_proxy = false
persistent_torrent_completed_stat = false
remove_peerless_torrents = true
tracker_usage_statistics = true

[[udp_trackers]]
bind_address = "0.0.0.0:6969"
enabled = true

[[http_trackers]]
bind_address = "0.0.0.0:7070"
enabled = true
ssl_cert_path = ""
ssl_enabled = false
ssl_key_path = ""

[http_api]
bind_address = "127.0.0.1:1212"
enabled = true
ssl_cert_path = ""
ssl_enabled = false
ssl_key_path = ""

[http_api.access_tokens]
admin = "MyAccessToken"

[health_check_api]
bind_address = "127.0.0.1:1313"

And I want to overwrite this value http_api.access_tokens.admin with an env var:

[http_api.access_tokens]
admin = "MyAccessToken"

It seems that I can do it using this env var name: TORRUST_TRACKER_HTTP_API.ACCESS_TOKENS.ADMIN (prefix TORRUST_TRACKER_), but that's not a valid var name in Bash.

Any suggestion about how to solve this problem? I could solve it if there is a way to use a different separator, for example, __ instead of ..

bash --version
GNU bash, version 5.2.15(1)-release (x86_64-pc-linux-gnu)

By the way, http_api.access_tokens is a dynamic dictionary (HashMap<String, String>) but it looks that's not a problem. I was able to write a test with jail and overwrite the value. My problem is using that name in Bash.

[josecelano]

export TORRUST_TRACKER_HTTP_API.ACCESS_TOKENS.ADMIN=NewToken
bash: export: `TORRUST_TRACKER_HTTP_API.ACCESS_TOKENS.ADMIN=NewToken': not a valid identifier

[SergioBenitez]

Check out the docs for the Env provider.

Any suggestion about how to solve this problem? I could solve it if there is a way to use a different separator, for example, __ instead of ..

Use Env::split("__").

You can also provide structured data as the top level key. APP_VAR={key="value",num=10}

[josecelano]

Check out the docs for the Env provider.

Any suggestion about how to solve this problem? I could solve it if there is a way to use a different separator, for example, __ instead of ..

Use Env::split("__").

You can also provide structured data as the top level key. APP_VAR={key="value",num=10}

Thank you, @SergioBenitez, for your fast response, and sorry 🙏🏼 I did not see that. I try searching in the docs first but I did not find that. I should have made a bigger effort.

Finally, I'm using a double underscore:

TORRUST_TRACKER__HTTP_API__ACCESS_TOKENS__ADMIN

Thank you for sharing this crate! (and others).