├── .gitignore
├── .travis.yml
├── CHANGELOG.md
├── Cargo.toml
├── LICENSE
├── Makefile
├── README.md
├── ci
    └── script.sh
├── envconfig
    ├── Cargo.toml
    ├── LICENSE
    ├── README.md
    └── src
    │   ├── error.rs
    │   ├── lib.rs
    │   ├── traits.rs
    │   └── utils.rs
├── envconfig_derive
    ├── Cargo.toml
    ├── LICENSE
    ├── README.md
    └── src
    │   └── lib.rs
├── logo
    ├── envconfig.svg
    └── logo_draft.svg
└── test_suite
    ├── Cargo.toml
    ├── src
        └── main.rs
    └── tests
        ├── basic.rs
        ├── default.rs
        ├── default_env_var.rs
        ├── nested.rs
        └── option.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | target/
2 | .idea/
3 | **/*.rs.bk
4 | *.sw[po]
5 | Cargo.lock
6 | 


--------------------------------------------------------------------------------
/.travis.yml:
--------------------------------------------------------------------------------
1 | language: rust
2 | rust:
3 |   - stable
4 | install:
5 |   - rustup component add rustfmt-preview
6 |   - rustup component add clippy-preview
7 | script:
8 |   - ./ci/script.sh
9 | 


--------------------------------------------------------------------------------
/CHANGELOG.md:
--------------------------------------------------------------------------------
 1 | #### v0.11.0 - 2024-09-07
 2 | * [breaking] Nested config fields now needs to be marked with #[envconfig(nested)]
 3 | * Environment variable can be automatically derived from a field name (e.g. `db_host` will be tried to loaded from `DB_HOST` env var)
 4 | * Add install step in README
 5 | * Update `syn` dependency to 2.x.x
 6 | 
 7 | #### v0.10.0 - 2021-06-8
 8 | * Add `init_from_hashmap` to initialize config from `HashMap<String, String>` in unit tests
 9 | 
10 | #### v0.9.1 - 2019-10-09
11 | * Get rid of thiserror dependency
12 | 
13 | #### v0.9.0 - 2019-10-05
14 | * Use rust edition 2018
15 | * Make envconfig re-export Envconfig macro from envconfig_derive (no need to use envconfig_derive explicitly anymore)
16 | * Deprecate `init()` function in favor of `init_from_env()`
17 | 
18 | #### v0.8.0 - 2019-03-31
19 | * Update `syn`, `quote` and `proc-macro2` dependencies to be `1.x.x`
20 | 
21 | #### v0.7.0 - 2019-02-20
22 | * Use `thiserror` for errors
23 | 
24 | #### v0.6.0 - 2019-12-22
25 | * Support nested structures
26 | 
27 | #### v0.5.1 - 2019-04-14
28 | * Fix `Result` overlapping bug
29 | 
30 | #### v0.5.0 - 2018-09-25
31 | * Support `default` attribute to specify default values
32 | 
33 | #### v0.4.0 - 2018-09-22
34 | * Support of `Option<T>` types
35 | * Rewrite `envconfig_derive` to use the latests versions of `syn` and `quote` crates
36 | * Improve error messages on panics
37 | * Add `skeptic` to generate tests based on README code examples
38 | 
39 | #### v0.3.0 - 2018-09-16
40 | * [breaking] Use `envconfig` attribute instead of `from` in the derive macro
41 | * [breaking] Remove init_or_die() function from Envconfig trait
42 | * [breaking] In envconfig_derive: rename function envconfig() -> derive()
43 | * [improvement] Add better documentation to the crate
44 | 
45 | #### v0.2.0 - 2018-09-13
46 | * [breaking] Use derive macro instead of macro_rules
47 | 
48 | #### v0.1.0 - 2018-08-18
49 | * First public release
50 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [workspace]
 2 | resolver = "2"
 3 | members = ["envconfig", "envconfig_derive", "test_suite"]
 4 | 
 5 | [workspace.package]
 6 | edition = "2021"
 7 | 
 8 | [workspace.lints.rust]
 9 | unsafe_code = "forbid"
10 | 
11 | [workspace.lints.clippy]
12 | pedantic = "warn"
13 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | (The MIT License)
 2 | 
 3 | Copyright (c) 2018 Sergey Potapov <blake131313@gmail.com>
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining
 6 | a copy of this software and associated documentation files (the
 7 | 'Software'), to deal in the Software without restriction, including
 8 | without limitation the rights to use, copy, modify, merge, publish,
 9 | distribute, sublicense, and/or sell copies of the Software, and to
10 | permit persons to whom the Software is furnished to do so, subject to
11 | the following conditions:
12 | 
13 | The above copyright notice and this permission notice shall be
14 | included in all copies or substantial portions of the Software.
15 | 
16 | THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
17 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19 | IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
20 | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
21 | TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
22 | SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 | 


--------------------------------------------------------------------------------
/Makefile:
--------------------------------------------------------------------------------
1 | test:
2 | 	cargo test -- --test-threads=1
3 | watch:
4 | 	cargo watch -s "cargo test -- --test-threads=1"
5 | clean:
6 | 	rm -rf ./target
7 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | <p align="center"><img width="200" src="https://raw.githubusercontent.com/greyblake/envconfig-rs/master/logo/envconfig.svg" alt="Envconfig logo"></p>
  2 | 
  3 | <p align="center">
  4 | <a href="https://travis-ci.org/greyblake/envconfig-rs" rel="nofollow"><img src="https://travis-ci.org/greyblake/envconfig-rs.svg?branch=master" alt="Build Status"></a>
  5 | <a href="https://raw.githubusercontent.com/greyblake/envconfig-rs/master/LICENSE" rel="nofollow"><img src="https://img.shields.io/badge/license-MIT-blue.svg" alt="License"></a>
  6 | <a href="https://docs.rs/envconfig" rel="nofollow"><img src="https://docs.rs/envconfig/badge.svg" alt="Documentation"></a>
  7 | <p>
  8 | 
  9 | <p align="center">Initialize config structure from environment variables in Rust without boilerplate.</p>
 10 | 
 11 | [![Stand With Ukraine](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/banner2-direct.svg)](https://stand-with-ukraine.pp.ua/)
 12 | 
 13 | ## Install
 14 | 
 15 | ```rust
 16 | [dependencies]
 17 | envconfig = "0.10.0"
 18 | ```
 19 | 
 20 | ## Usage
 21 | 
 22 | ### Basic example
 23 | 
 24 | Let's say you application relies on the following environment variables:
 25 | 
 26 | * `DB_HOST`
 27 | * `DB_PORT`
 28 | 
 29 | And you want to initialize `Config` structure like this one:
 30 | 
 31 | ```rust,ignore
 32 | struct Config {
 33 |     db_host: String,
 34 |     db_port: u16,
 35 | }
 36 | ```
 37 | 
 38 | You can achieve this with the following code without boilerplate:
 39 | 
 40 | ```rust
 41 | use envconfig::Envconfig;
 42 | 
 43 | #[derive(Envconfig)]
 44 | pub struct Config {
 45 |     #[envconfig(from = "DB_HOST")]
 46 |     pub db_host: String,
 47 | 
 48 |     #[envconfig(from = "DB_PORT", default = "5432")]
 49 |     pub db_port: u16,
 50 | }
 51 | 
 52 | fn main() {
 53 |     // Assuming the following environment variables are set
 54 |     std::env::set_var("DB_HOST", "127.0.0.1");
 55 | 
 56 |     // Initialize config from environment variables or terminate the process.
 57 |     let config = Config::init_from_env().unwrap();
 58 | 
 59 |     assert_eq!(config.db_host, "127.0.0.1");
 60 |     assert_eq!(config.db_port, 5432);
 61 | }
 62 | ```
 63 | 
 64 | ### Nested configs
 65 | 
 66 | Configs can be nested. Just add `#[envconfig(nested)]` to nested field.
 67 | 
 68 | ```rust
 69 | #[derive(Envconfig)]
 70 | pub struct DbConfig {
 71 |     #[envconfig(from = "DB_HOST")]
 72 |     pub host: String,
 73 | 
 74 |     #[envconfig(from = "DB_PORT", default = "5432")]
 75 |     pub port: u16,
 76 | }
 77 | 
 78 | #[derive(Envconfig)]
 79 | pub struct Config {
 80 |     #[envconfig(nested)]     // <---
 81 |     db: DbConfig,
 82 | 
 83 |     #[envconfig(from = "HOSTNAME")]
 84 |     hostname: String,
 85 | }
 86 | ```
 87 | 
 88 | 
 89 | ### Custom types
 90 | 
 91 | Under the hood envconfig relies on [`FromStr`](https://doc.rust-lang.org/std/str/trait.FromStr.html) trait.
 92 | If you want to use a custom type as a field for config, you have to implement `FromStr` trait for your custom type.
 93 | 
 94 | Let's say we want to extend `DbConfig` with `driver` field, which is `DbDriver` enum that represents either `Postgresql` or `Mysql`:
 95 | 
 96 | ```rust
 97 | pub enum DbDriver {
 98 |     Postgresql,
 99 |     Mysql,
100 | }
101 | 
102 | impl std::str::FromStr for DbDriver {
103 |     type Err = String;
104 | 
105 |     fn from_str(s: &str) -> Result<Self, Self::Err> {
106 |         match s.trim().to_lowercase().as_ref() {
107 |             "postgres" => Ok(DbDriver::Postgresql),
108 |             "mysql" => Ok(DbDriver::Mysql),
109 |             _ => Err(format!("Unknown DB driver: {s}"))
110 |         }
111 |     }
112 | }
113 | 
114 | #[derive(Envconfig)]
115 | pub struct DbConfig {
116 |     // ...
117 |     #[envconfig(from = "DB_DRIVER")]
118 |     pub driver: DbDriver,
119 | }
120 | ```
121 | 
122 | If this seems too cumbersome, consider using other crates like [strum](https://docs.rs/strum/latest/strum/) to derive `FromStr` automatically.
123 | 
124 | ```rust
125 | use strum::EnumString;
126 | 
127 | #[derive(EnumString)]
128 | pub enum DbDriver {
129 |     Postgresql,
130 |     Mysql,
131 | }
132 | ```
133 | 
134 | ## Testing
135 | 
136 | When writing tests you should avoid using environment variables. Cargo runs Rust tests in parallel by default which means
137 | you can end up with race conditions in your tests if two or more are fighting over an environment variable.
138 | 
139 | To solve this you can initialise your `struct` from a `HashMap<String, String>` in your tests. The `HashMap` should
140 | match what you expect the real environment variables to be; for example `DB_HOST` environment variable becomes a
141 | `DB_HOST` key in your `HashMap`.
142 | 
143 | ```rust
144 | use envconfig::Envconfig;
145 | 
146 | #[derive(Envconfig)]
147 | pub struct Config {
148 |     #[envconfig(from = "DB_HOST")]
149 |     pub db_host: String,
150 | 
151 |     #[envconfig(from = "DB_PORT", default = "5432")]
152 |     pub db_port: u16,
153 | }
154 | 
155 | #[test]
156 | fn test_config_can_be_loaded_from_hashmap() {
157 |     // Create a HashMap that looks like your environment
158 |     let mut hashmap = HashMap::new();
159 |     hashmap.insert("DB_HOST".to_string(), "127.0.0.1".to_string());
160 | 
161 |     // Initialize config from a HashMap to avoid test race conditions
162 |     let config = Config::init_from_hashmap(&hashmap).unwrap();
163 | 
164 |     assert_eq!(config.db_host, "127.0.0.1");
165 |     assert_eq!(config.db_port, 5432);
166 | }
167 | ```
168 | 
169 | ## Contributing
170 | 
171 | ### Running tests
172 | 
173 | Tests do some manipulation with environment variables, so to
174 | prevent flaky tests they have to be executed in a single thread:
175 | 
176 | ```
177 | cargo test -- --test-threads=1
178 | ```
179 | 
180 | ## License
181 | 
182 | [MIT](https://github.com/greyblake/envconfig-rs/blob/master/LICENSE) © [Sergey Potapov](http://greyblake.com/)
183 | 
184 | ## Contributors
185 | 
186 | - [greyblake](https://github.com/greyblake) Potapov Sergey - creator, maintainer.
187 | - [allevo](https://github.com/allevo) Tommaso Allevi - support nested structures
188 | - [hobofan](https://github.com/hobofan) Maximilian Goisser - update dependencies
189 | 


--------------------------------------------------------------------------------
/ci/script.sh:
--------------------------------------------------------------------------------
 1 | #!/usr/bin/env bash
 2 | 
 3 | # Make the entire script fail if one of the commands fails
 4 | set -ex
 5 | 
 6 | # Formatting
 7 | cargo fmt -- --check
 8 | 
 9 | # Clippy
10 | touch ./*/*/*.rs
11 | cargo clippy -- -W warnings
12 | 
13 | # Tests
14 | cargo test -- --test-threads=1
15 | 


--------------------------------------------------------------------------------
/envconfig/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "envconfig"
 3 | version = "0.11.0"
 4 | authors = ["Serhii Potapov <blake131313@gmail.com>"]
 5 | description = "Build a config structure from environment variables without boilerplate."
 6 | categories = ["config", "web-programming"]
 7 | keywords = ["config", "env", "macro", "configuration", "environment"]
 8 | license = "MIT"
 9 | repository = "https://github.com/greyblake/envconfig-rs"
10 | readme = "README.md"
11 | edition.workspace = true
12 | 
13 | [lints]
14 | workspace = true
15 | 
16 | [dependencies]
17 | envconfig_derive = { version = "0.11.0", path = "../envconfig_derive" }
18 | 


--------------------------------------------------------------------------------
/envconfig/LICENSE:
--------------------------------------------------------------------------------
1 | ../LICENSE


--------------------------------------------------------------------------------
/envconfig/README.md:
--------------------------------------------------------------------------------
1 | ../README.md


--------------------------------------------------------------------------------
/envconfig/src/error.rs:
--------------------------------------------------------------------------------
 1 | //! Errors resulting from calling functions in this crate
 2 | 
 3 | use std::{error::Error as StdError, fmt};
 4 | 
 5 | /// Represents an error, that may be returned by `fn init_from_env()` of trait `Envconfig`.
 6 | #[derive(Debug, PartialEq)]
 7 | pub enum Error {
 8 |     EnvVarMissing { name: &'static str },
 9 |     ParseError { name: &'static str },
10 | }
11 | 
12 | impl fmt::Display for Error {
13 |     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
14 |         match self {
15 |             Error::EnvVarMissing { name } => {
16 |                 write!(f, "Environment variable {name} is missing")
17 |             }
18 |             Error::ParseError { name } => {
19 |                 write!(f, "Failed to parse environment variable {name}")
20 |             }
21 |         }
22 |     }
23 | }
24 | 
25 | impl StdError for Error {
26 |     fn source(&self) -> Option<&(dyn StdError + 'static)> {
27 |         None
28 |     }
29 | }
30 | 


--------------------------------------------------------------------------------
/envconfig/src/lib.rs:
--------------------------------------------------------------------------------
 1 | //! Envconfig is a Rust library that helps to initialize configuration structure
 2 | //! from environment variables.
 3 | //! It makes use of custom derive macros to reduce boilerplate.
 4 | //!
 5 | //! Example
 6 | //!
 7 | //! ```
 8 | //! use std::env;
 9 | //! use envconfig::Envconfig;
10 | //!
11 | //! #[derive(Envconfig)]
12 | //! struct Config {
13 | //!     #[envconfig(from = "DB_HOST")]
14 | //!     pub db_host: String,
15 | //!
16 | //!     #[envconfig(from = "DB_PORT")]
17 | //!     pub db_port: Option<u16>,
18 | //!
19 | //!     #[envconfig(from = "HTTP_PORT", default = "8080")]
20 | //!     pub http_port: u16,
21 | //! }
22 | //!
23 | //! // We assume that those environment variables are set somewhere outside
24 | //! env::set_var("DB_HOST", "localhost");
25 | //! env::set_var("DB_PORT", "5432");
26 | //!
27 | //! // Initialize config from environment variables
28 | //! let config = Config::init_from_env().unwrap();
29 | //!
30 | //! assert_eq!(config.db_host, "localhost");
31 | //! assert_eq!(config.db_port, Some(5432));
32 | //! assert_eq!(config.http_port, 8080);
33 | //! ```
34 | //!
35 | //! The library uses `std::str::FromStr` trait to convert environment variables into custom
36 | //! data type. So, if your data type does not implement `std::str::FromStr` the program
37 | //! will not compile.
38 | 
39 | mod error;
40 | mod traits;
41 | mod utils;
42 | 
43 | pub use error::Error;
44 | pub use traits::Envconfig;
45 | pub use utils::{load_optional_var, load_var, load_var_with_default};
46 | 
47 | // re-export derive
48 | pub use envconfig_derive::Envconfig;
49 | 


--------------------------------------------------------------------------------
/envconfig/src/traits.rs:
--------------------------------------------------------------------------------
 1 | use crate::error::Error;
 2 | use std::collections::HashMap;
 3 | 
 4 | /// Indicates that structure can be initialize from environment variables.
 5 | pub trait Envconfig {
 6 |     /// Initialize structure from environment variables.
 7 |     /// Deprecated in favor of [`::init_from_env()`].
 8 |     ///
 9 |     /// # Errors
10 |     /// - Environment variable is missing.
11 |     /// - Failed to parse environment variable.
12 |     #[deprecated(
13 |         since = "0.9.0",
14 |         note = "Function init() is deprecated. Please use init_from_env() instead."
15 |     )]
16 |     fn init() -> Result<Self, Error>
17 |     where
18 |         Self: Sized;
19 | 
20 |     /// Initialize structure from environment variables.
21 |     ///
22 |     /// # Errors
23 |     /// - Environment variable is missing.
24 |     /// - Failed to parse environment variable.
25 |     fn init_from_env() -> Result<Self, Error>
26 |     where
27 |         Self: Sized;
28 | 
29 |     /// Initialize structure from a hashmap.
30 |     ///
31 |     /// # Errors
32 |     /// - Environment variable is missing.
33 |     /// - Failed to parse environment variable.
34 |     fn init_from_hashmap(hashmap: &HashMap<String, String>) -> Result<Self, Error>
35 |     where
36 |         Self: Sized;
37 | }
38 | 


--------------------------------------------------------------------------------
/envconfig/src/utils.rs:
--------------------------------------------------------------------------------
 1 | use std::env;
 2 | use std::str::FromStr;
 3 | 
 4 | use crate::error::Error;
 5 | use std::collections::HashMap;
 6 | 
 7 | /// Load an environment variable by name and parse it into type `T`.
 8 | ///
 9 | /// This function can also use a hashmap as a fallback or for testing purposes.
10 | ///
11 | /// # Errors
12 | /// - Environment variable is not present
13 | /// - Parsing failed
14 | pub fn load_var<T: FromStr, S: ::std::hash::BuildHasher>(
15 |     var_name: &'static str,
16 |     hashmap: Option<&HashMap<String, String, S>>,
17 | ) -> Result<T, Error> {
18 |     match hashmap {
19 |         None => env::var(var_name).ok(),
20 |         Some(hashmap) => hashmap.get(var_name).map(std::string::ToString::to_string),
21 |     }
22 |     .ok_or(Error::EnvVarMissing { name: var_name })
23 |     .and_then(|string_value| {
24 |         string_value
25 |             .parse::<T>()
26 |             .map_err(|_| Error::ParseError { name: var_name })
27 |     })
28 | }
29 | 
30 | /// Tries to load an environment variable by name and parse it into type `T`.
31 | /// If the environment variable is not present, it returns a default value.
32 | ///
33 | /// This function can also use a hashmap as a fallback or for testing purposes.
34 | ///
35 | /// # Errors
36 | /// - Parsing failed
37 | pub fn load_var_with_default<T: FromStr, S: ::std::hash::BuildHasher>(
38 |     var_name: &'static str,
39 |     hashmap: Option<&HashMap<String, String, S>>,
40 |     default: &'static str,
41 | ) -> Result<T, Error> {
42 |     let opt_var = match hashmap {
43 |         None => env::var(var_name).ok(),
44 |         Some(hashmap) => hashmap.get(var_name).map(std::string::ToString::to_string),
45 |     };
46 | 
47 |     let string_value = match opt_var {
48 |         None => default,
49 |         Some(ref value) => value,
50 |     };
51 | 
52 |     string_value
53 |         .parse::<T>()
54 |         .map_err(|_| Error::ParseError { name: var_name })
55 | }
56 | 
57 | /// Tries to load an environment variable by name and parse it into type `T`.
58 | /// If the environment variable is not present, it returns `None`.
59 | ///
60 | /// This function can also use a hashmap as a fallback or for testing purposes.
61 | ///
62 | /// # Errors
63 | /// - Parsing failed
64 | pub fn load_optional_var<T: FromStr, S: ::std::hash::BuildHasher>(
65 |     var_name: &'static str,
66 |     hashmap: Option<&HashMap<String, String, S>>,
67 | ) -> Result<Option<T>, Error> {
68 |     let opt_var = match hashmap {
69 |         None => env::var(var_name).ok(),
70 |         Some(hashmap) => hashmap.get(var_name).map(std::string::ToString::to_string),
71 |     };
72 | 
73 |     match opt_var {
74 |         None => Ok(None),
75 |         Some(string_value) => string_value
76 |             .parse::<T>()
77 |             .map(Some)
78 |             .map_err(|_| Error::ParseError { name: var_name }),
79 |     }
80 | }
81 | 


--------------------------------------------------------------------------------
/envconfig_derive/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "envconfig_derive"
 3 | version = "0.11.0"
 4 | authors = ["Serhii Potapov <blake131313@gmail.com>"]
 5 | description = "Build a config structure from environment variables without boilerplate."
 6 | categories = ["config", "web-programming"]
 7 | keywords = ["config", "env", "macro", "configuration", "environment"]
 8 | license = "MIT"
 9 | repository = "https://github.com/greyblake/envconfig-rs"
10 | readme = "README.md"
11 | edition.workspace = true
12 | 
13 | [lints]
14 | workspace = true
15 | 
16 | [lib]
17 | proc-macro = true
18 | 
19 | [dependencies]
20 | syn = { version = "2.0", features = ["parsing", "derive"] }
21 | quote = { version = "1.0", features = [] }
22 | proc-macro2 = { version = "1.0", features = [] }
23 | 


--------------------------------------------------------------------------------
/envconfig_derive/LICENSE:
--------------------------------------------------------------------------------
1 | ../LICENSE


--------------------------------------------------------------------------------
/envconfig_derive/README.md:
--------------------------------------------------------------------------------
1 | ../README.md


--------------------------------------------------------------------------------
/envconfig_derive/src/lib.rs:
--------------------------------------------------------------------------------
  1 | //! Provides a derive macro that implements `Envconfig` trait.
  2 | 
  3 | use proc_macro::TokenStream;
  4 | use quote::quote;
  5 | use syn::{
  6 |     punctuated::Punctuated, token::Comma, Attribute, Data::Struct, DeriveInput, Expr, Field,
  7 |     Fields, Ident, Lit, Meta, MetaNameValue, Token,
  8 | };
  9 | 
 10 | /// Custom derive for trait [`envconfig::Envconfig`]
 11 | ///
 12 | /// # Panics
 13 | /// - The provided [`TokenStream`] cannot be parsed
 14 | /// - The provided input is not a named struct
 15 | /// - Invalid configuration in the `envconfig` attributes
 16 | #[proc_macro_derive(Envconfig, attributes(envconfig))]
 17 | pub fn derive(input: TokenStream) -> TokenStream {
 18 |     let derive_input: DeriveInput = syn::parse(input).unwrap();
 19 |     let gen = impl_envconfig(&derive_input);
 20 |     gen.into()
 21 | }
 22 | 
 23 | /// Source type for envconfig variables.
 24 | ///
 25 | /// - `Environment`: Environment variables.
 26 | /// - `HashMap`: [`std::collections::HashMap`] for mocking environments in tests.
 27 | enum Source {
 28 |     Environment,
 29 |     HashMap,
 30 | }
 31 | 
 32 | /// Wrapper for [`impl_envconfig_for_struct`].
 33 | ///
 34 | /// Checks if the provided input is a struct and generates the desired `impl EnvConfig`
 35 | ///
 36 | /// # Panics
 37 | /// Panics if `input.data` isn't a struct
 38 | fn impl_envconfig(input: &DeriveInput) -> proc_macro2::TokenStream {
 39 |     let struct_name = &input.ident;
 40 | 
 41 |     // Check if derive input is a struct and contains named fields. Panic otherwise
 42 |     let named_fields = match input.data {
 43 |         Struct(ref ds) => match ds.fields {
 44 |             Fields::Named(ref fields) => &fields.named,
 45 |             _ => panic!("envconfig supports only named fields"),
 46 |         },
 47 |         _ => panic!("envconfig only supports non-tuple structs"),
 48 |     };
 49 | 
 50 |     let inner_impl = impl_envconfig_for_struct(struct_name, named_fields);
 51 | 
 52 |     quote!(#inner_impl)
 53 | }
 54 | 
 55 | /// Generates the `impl Envconfig` blocks for the provided struct
 56 | fn impl_envconfig_for_struct(
 57 |     struct_name: &Ident,
 58 |     fields: &Punctuated<Field, Comma>,
 59 | ) -> proc_macro2::TokenStream {
 60 |     let field_assigns_env = fields
 61 |         .iter()
 62 |         .map(|field| gen_field_assign(field, &Source::Environment));
 63 |     let field_assigns_hashmap = fields
 64 |         .iter()
 65 |         .map(|field| gen_field_assign(field, &Source::HashMap));
 66 | 
 67 |     quote! {
 68 |         impl Envconfig for #struct_name {
 69 |             fn init_from_env() -> ::std::result::Result<Self, ::envconfig::Error> {
 70 |                 let config = Self {
 71 |                     #(#field_assigns_env,)*
 72 |                 };
 73 |                 Ok(config)
 74 |             }
 75 | 
 76 |             fn init_from_hashmap(hashmap: &::std::collections::HashMap<String, String>) -> ::std::result::Result<Self, ::envconfig::Error> {
 77 |                 let config = Self {
 78 |                     #(#field_assigns_hashmap,)*
 79 |                 };
 80 |                 Ok(config)
 81 |             }
 82 | 
 83 |             #[deprecated(since="0.10.0", note="Please use `::init_from_env` instead")]
 84 |             fn init() -> ::std::result::Result<Self, ::envconfig::Error> {
 85 |                 Self::init_from_env()
 86 |             }
 87 |         }
 88 |     }
 89 | }
 90 | 
 91 | /// Generates the field assignments for the config struct
 92 | fn gen_field_assign(field: &Field, source: &Source) -> proc_macro2::TokenStream {
 93 |     let attr = fetch_envconfig_attr_from_field(field);
 94 | 
 95 |     if let Some(attr) = attr {
 96 |         // if #[envconfig(...)] is there
 97 |         let list = fetch_args_from_attr(field, attr);
 98 | 
 99 |         // If nested attribute is present
100 |         let nested_value_opt = find_item_in_list(&list, "nested");
101 |         match nested_value_opt {
102 |             Some(MatchingItem::NoValue) => return gen_field_assign_for_struct_type(field, source),
103 |             Some(MatchingItem::WithValue(_)) => {
104 |                 panic!("`nested` attribute must not have a value")
105 |             }
106 |             None => {}
107 |         }
108 | 
109 |         // Default value for the field
110 |         let opt_default = match find_item_in_list(&list, "default") {
111 |             Some(MatchingItem::WithValue(v)) => Some(v),
112 |             Some(MatchingItem::NoValue) => panic!("`default` attribute must have a value"),
113 |             None => None,
114 |         };
115 | 
116 |         // Environment variable name
117 |         let from_opt = find_item_in_list(&list, "from");
118 |         let env_var = match from_opt {
119 |             Some(MatchingItem::WithValue(v)) => quote! { #v },
120 |             Some(MatchingItem::NoValue) => panic!("`from` attribute must have a value"),
121 |             None => field_to_env_var_name(field),
122 |         };
123 | 
124 |         gen(field, &env_var, opt_default, source)
125 |     } else {
126 |         // if #[envconfig(...)] is not present
127 |         // use field name as name of the environment variable
128 |         let env_var = field_to_env_var_name(field);
129 |         gen(field, &env_var, None, source)
130 |     }
131 | }
132 | 
133 | /// Turns the field name into an uppercase [`proc_macro2::TokenStream`]
134 | ///
135 | /// # Panics
136 | /// Panics if the field does not have an identifier
137 | fn field_to_env_var_name(field: &Field) -> proc_macro2::TokenStream {
138 |     let field_name = field.ident.clone().unwrap().to_string().to_uppercase();
139 |     quote! { #field_name }
140 | }
141 | 
142 | /// Generates the derived field assignment for the provided field
143 | fn gen(
144 |     field: &Field,
145 |     from: &proc_macro2::TokenStream,
146 |     opt_default: Option<&Lit>,
147 |     source: &Source,
148 | ) -> proc_macro2::TokenStream {
149 |     let field_type = &field.ty;
150 |     if to_s(field_type).starts_with("Option ") {
151 |         gen_field_assign_for_optional_type(field, from, opt_default, source)
152 |     } else {
153 |         gen_field_assign_for_non_optional_type(field, from, opt_default, source)
154 |     }
155 | }
156 | 
157 | /// Generates the derived field assignment for a (nested) struct type
158 | ///
159 | /// # Panics
160 | /// Panics if the field type is not a path
161 | fn gen_field_assign_for_struct_type(field: &Field, source: &Source) -> proc_macro2::TokenStream {
162 |     let ident: &Option<Ident> = &field.ident;
163 |     match &field.ty {
164 |         syn::Type::Path(path) => match source {
165 |             Source::Environment => quote! {
166 |                 #ident: #path :: init_from_env()?
167 |             },
168 |             Source::HashMap => quote! {
169 |                 #ident: #path :: init_from_hashmap(hashmap)?
170 |             },
171 |         },
172 |         _ => panic!("Expected field type to be a path: {ident:?}",),
173 |     }
174 | }
175 | 
176 | /// Generates the derived field assignment for an optional type
177 | ///
178 | /// # Panics
179 | /// Panics if the field is an optional type with a default value
180 | fn gen_field_assign_for_optional_type(
181 |     field: &Field,
182 |     from: &proc_macro2::TokenStream,
183 |     opt_default: Option<&Lit>,
184 |     source: &Source,
185 | ) -> proc_macro2::TokenStream {
186 |     let field_name = &field.ident;
187 | 
188 |     assert!(opt_default.is_none(), "Optional type on field `{}` with default value does not make sense and therefore is not allowed", to_s(field_name));
189 | 
190 |     match source {
191 |         Source::Environment => quote! {
192 |             #field_name: ::envconfig::load_optional_var::<_,::std::collections::hash_map::RandomState>(#from, None)?
193 |         },
194 |         Source::HashMap => quote! {
195 |             #field_name: ::envconfig::load_optional_var::<_,::std::collections::hash_map::RandomState>(#from, Some(hashmap))?
196 |         },
197 |     }
198 | }
199 | 
200 | /// Generates the derived field assignment for non-optional types
201 | fn gen_field_assign_for_non_optional_type(
202 |     field: &Field,
203 |     from: &proc_macro2::TokenStream,
204 |     opt_default: Option<&Lit>,
205 |     source: &Source,
206 | ) -> proc_macro2::TokenStream {
207 |     let field_name = &field.ident;
208 | 
209 |     if let Some(default) = opt_default {
210 |         match source {
211 |             Source::Environment => quote! {
212 |                 #field_name: ::envconfig::load_var_with_default::<_,::std::collections::hash_map::RandomState>(#from, None, #default)?
213 |             },
214 |             Source::HashMap => quote! {
215 |                 #field_name: ::envconfig::load_var_with_default::<_,::std::collections::hash_map::RandomState>(#from, Some(hashmap), #default)?
216 |             },
217 |         }
218 |     } else {
219 |         match source {
220 |             Source::Environment => quote! {
221 |                 #field_name: ::envconfig::load_var::<_,::std::collections::hash_map::RandomState>(#from, None)?
222 |             },
223 |             Source::HashMap => quote! {
224 |                 #field_name: ::envconfig::load_var::<_,::std::collections::hash_map::RandomState>(#from, Some(hashmap))?
225 |             },
226 |         }
227 |     }
228 | }
229 | 
230 | /// Tries to get the (first) `envconfig` attribute from the provided field
231 | fn fetch_envconfig_attr_from_field(field: &Field) -> Option<&Attribute> {
232 |     field.attrs.iter().find(|a| {
233 |         let path = &a.path();
234 |         let name = quote!(#path).to_string();
235 |         name == "envconfig"
236 |     })
237 | }
238 | 
239 | /// Fetches the arguments from the provided attribute
240 | ///
241 | /// # Panics
242 | /// Panics if the attribute cannot be parsed
243 | fn fetch_args_from_attr(field: &Field, attr: &Attribute) -> Vec<Meta> {
244 |     let opt_meta = &attr.meta;
245 | 
246 |     match opt_meta {
247 |         Meta::List(l) => l
248 |             .parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated)
249 |             .unwrap_or_else(|err| {
250 |                 panic!(
251 |                     "{:?} in `envconfig` attribute on field `{}`",
252 |                     err,
253 |                     field_name(field)
254 |                 )
255 |             })
256 |             .iter()
257 |             .cloned()
258 |             .collect(),
259 |         _ => vec![opt_meta.clone()],
260 |     }
261 | }
262 | 
263 | /// Represents the result of a search for an item in a [`Meta`] list
264 | enum MatchingItem<'a> {
265 |     WithValue(&'a Lit),
266 |     NoValue,
267 | }
268 | 
269 | /// Tries to find the first matching item in the provided list
270 | ///
271 | /// # Returns
272 | ///
273 | /// - `MatchingItem::WithValue(&Lit)` if a name-value pair is found
274 | /// - `MatchingItem::NoValue` if a path is found
275 | /// - `None` if no matching item is found
276 | ///
277 | /// # Panics
278 | ///
279 | /// - Multiple items with the same name exist
280 | /// - The item is not a name-value pair or a path
281 | fn find_item_in_list<'l>(list: &'l [Meta], item_name: &str) -> Option<MatchingItem<'l>> {
282 |     // Find all items with the provided name
283 |     let matching_items = list
284 |         .iter()
285 |         .filter(|token_tree| token_tree.path().is_ident(item_name))
286 |         .collect::<Vec<_>>();
287 | 
288 |     // Check that there is at most one item with the provided name. Error otherwise
289 |     assert!(
290 |         matching_items.len() <= 1,
291 |         "Found multiple `{item_name}` attributes in `envconfig` attribute",
292 |     );
293 | 
294 |     let matching_result = matching_items.first();
295 | 
296 |     if let Some(meta) = matching_result {
297 |         return match meta {
298 |             Meta::NameValue(MetaNameValue {
299 |                 value: Expr::Lit(value),
300 |                 ..
301 |             }) => Some(MatchingItem::WithValue(&value.lit)),
302 |             Meta::Path(_) => Some(MatchingItem::NoValue),
303 |             _ => panic!("Expected `{item_name}` to be a name-value pair or a path"),
304 |         };
305 |     }
306 | 
307 |     None
308 | }
309 | 
310 | /// Returns the name of the field as a string
311 | fn field_name(field: &Field) -> String {
312 |     to_s(&field.ident)
313 | }
314 | 
315 | /// Converts a [`quote::ToTokens`] to a string
316 | fn to_s<T: quote::ToTokens>(node: &T) -> String {
317 |     quote!(#node).to_string()
318 | }
319 | 


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162 |        style="fill:#000300;fill-opacity:1;stroke:none;stroke-width:0.5;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
163 |   </g>
164 | </svg>
165 | 


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/test_suite/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "envconfig_test_suite"
 3 | version = "0.2.0"
 4 | authors = ["Sergey Potapov <blake131313@gmail.com>"]
 5 | edition.workspace = true
 6 | 
 7 | [lints]
 8 | workspace = true
 9 | 
10 | [dependencies]
11 | envconfig = { path = "../envconfig" }
12 | envconfig_derive = { path = "../envconfig_derive" }
13 | 


--------------------------------------------------------------------------------
/test_suite/src/main.rs:
--------------------------------------------------------------------------------
 1 | extern crate envconfig;
 2 | 
 3 | use envconfig::Envconfig;
 4 | 
 5 | #[derive(Envconfig)]
 6 | pub struct Config {
 7 |     pub port: u16,
 8 | 
 9 |     #[envconfig(from = "HOST")]
10 |     pub host: String,
11 | }
12 | 
13 | // Ensure custom Result can be defined in the current context.
14 | // See: https://github.com/greyblake/envconfig-rs/issues/21
15 | type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
16 | 
17 | fn main() {
18 |     let res: Result<i32> = Ok(123);
19 |     println!("{res:?}");
20 | }
21 | 


--------------------------------------------------------------------------------
/test_suite/tests/basic.rs:
--------------------------------------------------------------------------------
  1 | extern crate envconfig;
  2 | 
  3 | use envconfig::{Envconfig, Error};
  4 | use std::collections::HashMap;
  5 | use std::env;
  6 | 
  7 | #[derive(Envconfig)]
  8 | pub struct Config {
  9 |     #[envconfig(from = "DB_HOST")]
 10 |     pub db_host: String,
 11 | 
 12 |     #[envconfig(from = "DB_PORT")]
 13 |     pub db_port: u16,
 14 | }
 15 | 
 16 | fn setup() {
 17 |     env::remove_var("DB_HOST");
 18 |     env::remove_var("DB_PORT");
 19 | }
 20 | 
 21 | #[test]
 22 | fn test_inits_config_from_env_variables() {
 23 |     setup();
 24 | 
 25 |     env::set_var("DB_HOST", "localhost");
 26 |     env::set_var("DB_PORT", "5432");
 27 | 
 28 |     let config = Config::init_from_env().unwrap();
 29 |     assert_eq!(config.db_host, "localhost");
 30 |     assert_eq!(config.db_port, 5432u16);
 31 | }
 32 | 
 33 | #[test]
 34 | fn test_inits_config_from_hashmap() {
 35 |     setup();
 36 | 
 37 |     let mut hashmap = HashMap::new();
 38 |     hashmap.insert("DB_HOST".to_string(), "localhost".to_string());
 39 |     hashmap.insert("DB_PORT".to_string(), "5432".to_string());
 40 | 
 41 |     let config = Config::init_from_hashmap(&hashmap).unwrap();
 42 |     assert_eq!(config.db_host, "localhost");
 43 |     assert_eq!(config.db_port, 5432u16);
 44 | }
 45 | 
 46 | #[test]
 47 | fn test_checks_presence_of_env_vars() {
 48 |     setup();
 49 | 
 50 |     env::set_var("DB_HOST", "localhost");
 51 | 
 52 |     let err = Config::init_from_env().err().unwrap();
 53 |     let expected_err = Error::EnvVarMissing { name: "DB_PORT" };
 54 |     assert_eq!(err, expected_err);
 55 | }
 56 | 
 57 | #[test]
 58 | fn test_checks_presence_of_hashmap_keys() {
 59 |     setup();
 60 | 
 61 |     let mut hashmap = HashMap::new();
 62 |     hashmap.insert("DB_HOST".to_string(), "localhost".to_string());
 63 | 
 64 |     let err = Config::init_from_hashmap(&hashmap).err().unwrap();
 65 |     let expected_err = Error::EnvVarMissing { name: "DB_PORT" };
 66 |     assert_eq!(err, expected_err);
 67 | }
 68 | 
 69 | #[test]
 70 | fn test_fails_if_can_not_parse_db_port_from_env() {
 71 |     setup();
 72 | 
 73 |     env::set_var("DB_HOST", "localhost");
 74 |     env::set_var("DB_PORT", "67000");
 75 | 
 76 |     let err = Config::init_from_env().err().unwrap();
 77 |     let expected_err = Error::ParseError { name: "DB_PORT" };
 78 |     assert_eq!(err, expected_err);
 79 | }
 80 | 
 81 | #[test]
 82 | fn test_fails_if_can_not_parse_db_port_from_hashmap() {
 83 |     setup();
 84 | 
 85 |     let mut hashmap = HashMap::new();
 86 |     hashmap.insert("DB_HOST".to_string(), "localhost".to_string());
 87 |     hashmap.insert("DB_PORT".to_string(), "67000".to_string());
 88 | 
 89 |     let err = Config::init_from_hashmap(&hashmap).err().unwrap();
 90 |     let expected_err = Error::ParseError { name: "DB_PORT" };
 91 |     assert_eq!(err, expected_err);
 92 | }
 93 | 
 94 | #[test]
 95 | fn test_custom_from_str() {
 96 |     use std::num::ParseIntError;
 97 |     use std::str::FromStr;
 98 | 
 99 |     setup();
100 | 
101 |     #[derive(Debug, PartialEq)]
102 |     struct Point {
103 |         x: i32,
104 |         y: i32,
105 |     }
106 | 
107 |     impl FromStr for Point {
108 |         type Err = ParseIntError;
109 | 
110 |         fn from_str(s: &str) -> Result<Self, Self::Err> {
111 |             let coords: Vec<&str> = s
112 |                 .trim_matches(|p| p == '(' || p == ')')
113 |                 .split(',')
114 |                 .collect();
115 | 
116 |             let x_fromstr = coords[0].parse::<i32>()?;
117 |             let y_fromstr = coords[1].parse::<i32>()?;
118 | 
119 |             Ok(Point {
120 |                 x: x_fromstr,
121 |                 y: y_fromstr,
122 |             })
123 |         }
124 |     }
125 | 
126 |     #[derive(Envconfig)]
127 |     pub struct Config {
128 |         #[envconfig(from = "POINT")]
129 |         point: Point,
130 |     }
131 | 
132 |     env::set_var("POINT", "(1,2)");
133 | 
134 |     let err = Config::init_from_env().unwrap();
135 |     assert_eq!(err.point, Point { x: 1, y: 2 });
136 | 
137 |     setup();
138 | 
139 |     let mut hashmap = HashMap::new();
140 |     hashmap.insert("POINT".to_string(), "(1,2)".to_string());
141 | 
142 |     let err = Config::init_from_hashmap(&hashmap).unwrap();
143 |     assert_eq!(err.point, Point { x: 1, y: 2 });
144 | }
145 | 


--------------------------------------------------------------------------------
/test_suite/tests/default.rs:
--------------------------------------------------------------------------------
 1 | extern crate envconfig;
 2 | 
 3 | use envconfig::Envconfig;
 4 | use std::collections::HashMap;
 5 | use std::env;
 6 | 
 7 | #[derive(Envconfig)]
 8 | pub struct Config {
 9 |     #[envconfig(from = "PORT", default = "5432")]
10 |     pub port: u16,
11 | }
12 | 
13 | fn setup() {
14 |     env::remove_var("PORT");
15 | }
16 | 
17 | #[test]
18 | fn test_when_env_is_missing() {
19 |     setup();
20 | 
21 |     let config = Config::init_from_env().unwrap();
22 |     assert_eq!(config.port, 5432);
23 | }
24 | 
25 | #[test]
26 | fn test_when_hashmap_key_is_missing() {
27 |     setup();
28 | 
29 |     let config = Config::init_from_hashmap(&HashMap::new()).unwrap();
30 |     assert_eq!(config.port, 5432);
31 | }
32 | 
33 | #[test]
34 | fn test_when_env_is_present() {
35 |     setup();
36 | 
37 |     env::set_var("PORT", "8080");
38 |     let config = Config::init_from_env().unwrap();
39 |     assert_eq!(config.port, 8080);
40 | }
41 | 
42 | #[test]
43 | fn test_when_hashmap_key_is_present() {
44 |     setup();
45 | 
46 |     let mut hashmap = HashMap::new();
47 |     hashmap.insert("PORT".to_string(), "8080".to_string());
48 | 
49 |     let config = Config::init_from_hashmap(&hashmap).unwrap();
50 |     assert_eq!(config.port, 8080);
51 | }
52 | 


--------------------------------------------------------------------------------
/test_suite/tests/default_env_var.rs:
--------------------------------------------------------------------------------
 1 | extern crate envconfig;
 2 | 
 3 | use envconfig::{Envconfig, Error};
 4 | use std::collections::HashMap;
 5 | use std::env;
 6 | 
 7 | #[derive(Envconfig)]
 8 | pub struct Config {
 9 |     pub db_host: String,
10 |     pub db_port: Option<u16>,
11 | }
12 | 
13 | fn setup() {
14 |     env::remove_var("DB_HOST");
15 |     env::remove_var("DB_PORT");
16 | }
17 | 
18 | #[test]
19 | fn test_derives_env_variable_names_automatically() {
20 |     setup();
21 | 
22 |     env::set_var("DB_HOST", "db.example.com");
23 |     env::set_var("DB_PORT", "5050");
24 | 
25 |     let config = Config::init_from_env().unwrap();
26 |     assert_eq!(config.db_host, "db.example.com");
27 |     assert_eq!(config.db_port, Some(5050));
28 | }
29 | 
30 | #[test]
31 | fn test_derives_hashmap_keys_automatically() {
32 |     setup();
33 | 
34 |     let mut hashmap = HashMap::new();
35 |     hashmap.insert("DB_HOST".to_string(), "db.example.com".to_string());
36 |     hashmap.insert("DB_PORT".to_string(), "5050".to_string());
37 | 
38 |     let config = Config::init_from_hashmap(&hashmap).unwrap();
39 |     assert_eq!(config.db_host, "db.example.com");
40 |     assert_eq!(config.db_port, Some(5050));
41 | }
42 | 
43 | #[test]
44 | fn test_var_is_missing() {
45 |     setup();
46 | 
47 |     let err = Config::init_from_env().err().unwrap();
48 |     let expected_err = Error::EnvVarMissing { name: "DB_HOST" };
49 |     assert_eq!(err, expected_err);
50 | }
51 | 
52 | #[test]
53 | fn test_key_is_missing() {
54 |     setup();
55 | 
56 |     let err = Config::init_from_hashmap(&HashMap::default())
57 |         .err()
58 |         .unwrap();
59 |     let expected_err = Error::EnvVarMissing { name: "DB_HOST" };
60 |     assert_eq!(err, expected_err);
61 | }
62 | 


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/test_suite/tests/nested.rs:
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  1 | extern crate envconfig;
  2 | 
  3 | use envconfig::{Envconfig, Error};
  4 | use std::collections::HashMap;
  5 | use std::env;
  6 | 
  7 | #[derive(Envconfig)]
  8 | pub struct DBConfig {
  9 |     #[envconfig(from = "DB_HOST")]
 10 |     pub host: String,
 11 |     #[envconfig(from = "DB_PORT")]
 12 |     pub port: u16,
 13 | }
 14 | 
 15 | #[derive(Envconfig)]
 16 | pub struct Config {
 17 |     #[envconfig(nested)]
 18 |     pub db: DBConfig,
 19 | }
 20 | 
 21 | #[derive(Envconfig)]
 22 | pub struct ConfigDouble {
 23 |     #[envconfig(nested)]
 24 |     pub db1: DBConfig,
 25 | 
 26 |     #[envconfig(nested)]
 27 |     pub db2: DBConfig,
 28 | }
 29 | 
 30 | fn setup() {
 31 |     env::remove_var("DB_HOST");
 32 |     env::remove_var("DB_PORT");
 33 | }
 34 | 
 35 | #[test]
 36 | fn test_nesting_env() {
 37 |     setup();
 38 | 
 39 |     env::set_var("DB_HOST", "localhost");
 40 |     env::set_var("DB_PORT", "5432");
 41 | 
 42 |     let config = Config::init_from_env().unwrap();
 43 |     assert_eq!(config.db.host, "localhost");
 44 |     assert_eq!(config.db.port, 5432u16);
 45 | }
 46 | 
 47 | #[test]
 48 | fn test_nesting_hashmap() {
 49 |     setup();
 50 | 
 51 |     let mut hashmap = HashMap::new();
 52 |     hashmap.insert("DB_HOST".to_string(), "localhost".to_string());
 53 |     hashmap.insert("DB_PORT".to_string(), "5432".to_string());
 54 | 
 55 |     let config = Config::init_from_hashmap(&hashmap).unwrap();
 56 |     assert_eq!(config.db.host, "localhost");
 57 |     assert_eq!(config.db.port, 5432u16);
 58 | }
 59 | 
 60 | #[test]
 61 | fn test_nesting_env_error() {
 62 |     setup();
 63 | 
 64 |     env::set_var("DB_HOST", "localhost");
 65 | 
 66 |     let err = Config::init_from_env().err().unwrap();
 67 |     let expected_err = Error::EnvVarMissing { name: "DB_PORT" };
 68 |     assert_eq!(err, expected_err);
 69 | }
 70 | 
 71 | #[test]
 72 | fn test_nesting_hashmap_error() {
 73 |     setup();
 74 | 
 75 |     let mut hashmap = HashMap::new();
 76 |     hashmap.insert("DB_HOST".to_string(), "localhost".to_string());
 77 | 
 78 |     let err = Config::init_from_hashmap(&hashmap).err().unwrap();
 79 |     let expected_err = Error::EnvVarMissing { name: "DB_PORT" };
 80 |     assert_eq!(err, expected_err);
 81 | }
 82 | 
 83 | #[test]
 84 | fn test_duplicated_are_allowed_in_env() {
 85 |     setup();
 86 | 
 87 |     env::set_var("DB_HOST", "localhost");
 88 |     env::set_var("DB_PORT", "5432");
 89 | 
 90 |     let config = ConfigDouble::init_from_env().unwrap();
 91 |     assert_eq!(config.db1.host, "localhost");
 92 |     assert_eq!(config.db1.port, 5432u16);
 93 |     assert_eq!(config.db2.host, "localhost");
 94 |     assert_eq!(config.db2.port, 5432u16);
 95 | }
 96 | 
 97 | #[test]
 98 | fn test_duplicated_are_allowed_in_hashmap() {
 99 |     setup();
100 | 
101 |     let mut hashmap = HashMap::new();
102 |     hashmap.insert("DB_HOST".to_string(), "localhost".to_string());
103 |     hashmap.insert("DB_PORT".to_string(), "5432".to_string());
104 | 
105 |     let config = ConfigDouble::init_from_hashmap(&hashmap).unwrap();
106 |     assert_eq!(config.db1.host, "localhost");
107 |     assert_eq!(config.db1.port, 5432u16);
108 |     assert_eq!(config.db2.host, "localhost");
109 |     assert_eq!(config.db2.port, 5432u16);
110 | }
111 | 


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/test_suite/tests/option.rs:
--------------------------------------------------------------------------------
 1 | extern crate envconfig;
 2 | 
 3 | use envconfig::{Envconfig, Error};
 4 | use std::collections::HashMap;
 5 | use std::env;
 6 | 
 7 | #[derive(Envconfig)]
 8 | pub struct Config {
 9 |     #[envconfig(from = "PORT")]
10 |     pub port: Option<u16>,
11 | }
12 | 
13 | fn setup() {
14 |     env::remove_var("PORT");
15 | }
16 | 
17 | #[test]
18 | fn test_env_var_is_missing() {
19 |     setup();
20 | 
21 |     let config = Config::init_from_env().unwrap();
22 |     assert_eq!(config.port, None);
23 | }
24 | 
25 | #[test]
26 | fn test_hashmap_key_is_missing() {
27 |     setup();
28 | 
29 |     let config = Config::init_from_hashmap(&HashMap::new()).unwrap();
30 |     assert_eq!(config.port, None);
31 | }
32 | 
33 | #[test]
34 | fn test_env_var_is_present() {
35 |     setup();
36 | 
37 |     env::set_var("PORT", "3030");
38 |     let config = Config::init_from_env().unwrap();
39 |     assert_eq!(config.port, Some(3030));
40 | }
41 | 
42 | #[test]
43 | fn test_hashmap_key_is_present() {
44 |     setup();
45 | 
46 |     let mut hashmap = HashMap::new();
47 |     hashmap.insert("PORT".to_string(), "3030".to_string());
48 | 
49 |     let config = Config::init_from_hashmap(&hashmap).unwrap();
50 |     assert_eq!(config.port, Some(3030));
51 | }
52 | 
53 | #[test]
54 | fn test_env_var_is_invalid() {
55 |     setup();
56 | 
57 |     env::set_var("PORT", "xyz");
58 |     let err = Config::init_from_env().err().unwrap();
59 |     let expected_err = Error::ParseError { name: "PORT" };
60 |     assert_eq!(err, expected_err);
61 | }
62 | 
63 | #[test]
64 | fn test_hashmap_key_is_invalid() {
65 |     setup();
66 | 
67 |     let mut hashmap = HashMap::new();
68 |     hashmap.insert("PORT".to_string(), "xyz".to_string());
69 | 
70 |     let err = Config::init_from_hashmap(&hashmap).err().unwrap();
71 |     let expected_err = Error::ParseError { name: "PORT" };
72 |     assert_eq!(err, expected_err);
73 | }
74 | 


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