7 stable releases
| 2.1.0 | May 21, 2024 |
|---|---|
| 2.0.4 | May 28, 2023 |
| 2.0.3 | Jul 29, 2022 |
| 2.0.2 |
|
| 1.0.1 | Nov 30, 2021 |
#1590 in Procedural macros
Used in 6 crates
(via env-url)
9KB
117 lines
ENV Url
Env-composable service urls complete with key overrides as to facilitate maximum flexibility and to simplify integration with kubernetes.
Env mapping behaviors
| ENV | |
|---|---|
| {PREFIX}_URL | set service url, disregarding other overrides |
| {PREFIX}_URL_ENV | override {PREFIX}_URL env mapping |
| {PREFIX}_SCHEME | set url scheme component |
| {PREFIX}_SCHEME_ENV | override {PREFIX}_SCHEME env mapping |
| {PREFIX}_HOST | set url host component |
| {PREFIX}_HOST_ENV | override {PREFIX}_HOST env mapping |
| {PREFIX}_PATH | set url path component |
| {PREFIX}_PATH_ENV | override {PREFIX}_PATH env mapping |
| {PREFIX}_QUERY | set url query component |
| {PREFIX}_QUERY_ENV | override {PREFIX}_QUERY env mapping |
| {PREFIX}_USERINFO | set url userinfo component |
| {PREFIX}_USERINFO_ENV | override {PREFIX}_USERINFO env mapping |
Example
use env_url::*;
#[derive(EnvURL)]
#[env_url(env_prefix = "REDIS", default = "redis://127.0.0.1:6379")]
pub struct RedisDB;
let service_url = RedisDB::service_url();
Kubernetes usage
As kubernetes can set services to env variables for service discovery, it's very useful to be able to override the env mappings like so
REDIS_HOST_ENV: STAGE_REDIS_MASTER_PORT_6379_TCP_ADDR
REDIS_PORT_ENV: STAGE_REDIS_MASTER_SERVICE_PORT_REDIS
Dependencies
~2.3–3.5MB
~60K SLoC