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Tyler Hallada 519fcb4c5a Add caching with LRU cache under mutex

Caches responses of each GET handler in a separate capacity-limited cache (as a
custom clone-able `CachedResponse` struct). Subsequent requests will build a
`Response` from the cached bytes instead of re-querying the database and
re-serializing the JSON. This greatly speeds up the list endpoints and
`get_interior_ref_list`.

Also caches the api-key-to-id mapping for `Owner`s in order to speed up frequent
authentications.

Each create handler clears the entire list response cache. Each delete handler
also clears the entire list response cache and deletes the cached response for
that key. Deleting an owner also deletes their entry in the
`owner_ids_by_api_key` cache.

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src

Add caching with LRU cache under mutex

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test_data

Add caching with LRU cache under mutex

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.gitignore

Update setup instructions

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Cargo.lock

Add caching with LRU cache under mutex

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Cargo.toml

Add caching with LRU cache under mutex

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devserver.sh

Update setup instructions

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README.md

Improve model query performance tracing

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README.md

Development Setup

Install and run postgres.
Create postgres user and database (and add uuid extension while you're there ): createuser shopkeeper createdb shopkeeper sudo -u postgres -i psql postgres=# ALTER DATABASE shopkeeper OWNER TO shopkeeper; \password shopkeeper postgres=# CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
Save password somewhere safe and then and add a .env file to the project directory with the contents: DATABASE_URL=postgresql://shopkeeper:@localhost/shopkeeper RUST_LOG="shopkeeper=debug" HOST="http://localhost:3030"
Create a new file at src/db/refinery.toml with the contents: [main] db_type = "Postgres" db_host = "localhost" db_port = "5432" db_user = "shopkeeper" db_pass = "" db_name = "shopkeeper"
Run cargo run -- -m which will compile the app in debug mode and run the database migrations.
Run ./devserver.sh to run the dev server (by default it listens at 127.0.0.1:3030).

Todo

Add HTTP header authentication for endpoints that modify an owner's data.
Add DELETE endpoints for existing resources.
Add endpoints for the other models.
Add caching. Not sure how to do this exactly. Could use Redis, Varnish, Nginx, or a lib resident in the rust web server process. I'll probably need to do invalidations as transactions are made, or interiors are updated.
Make self-contained docker container that can run the app without any setup.
Add rate-limiting per IP address. The tower crate has a service that might be useful for this.