feat: Add possibility to configure key prefix (Redis, MemCached)

docs/Configuration.md

@@ -57,17 +57,38 @@ cache_to = "sccache-latest"
 cache_from = "sccache-"
 
 [cache.memcached]
-url = "..."
+url = "127.0.0.1:11211"
+# Entry expiration time in seconds. Default is 86400 (24 hours)
+expiration = 3600
+key_prefix = "/custom/prefix/if/need"
 
 [cache.redis]
 url = "redis://user:passwd@1.2.3.4:6379/?db=1"
+# Entry expiration time in seconds. Default is 0 (never expire)
+expiration = 3600
+key_prefix = "/custom/prefix/if/need"
 
 [cache.s3]
 bucket = "name"
 endpoint = "s3-us-east-1.amazonaws.com"
 use_ssl = true
 key_prefix = "s3prefix"
 server_side_encryption = false
+
+[cache.webdav]
+endpoint = "http://192.168.10.42:80/some/webdav.php"
+key_prefix = "/custom/webdav/subfolder/if/need"
+# Basic HTTP authentication credentials.
+username = "alice"
+password = "secret12"
+# Mutually exclusive with username & password. Bearer token value
+token = "token123"
+
+[cache.oss]
+bucket = "name"
+endpoint = "oss-us-east-1.aliyuncs.com"
+key_prefix = "ossprefix"
+no_credentials = true
 ```
 
 sccache looks for its configuration file at the path indicated by env variable `SCCACHE_CONF`.
@@ -77,6 +98,8 @@ If no such env variable is set, sccache looks at default locations as below:
 - macOS: `~/Library/Application Support/Mozilla.sccache/config`
 - Windows: `%APPDATA%\Mozilla\sccache\config\config`
 
+The latest `cache.XXX` entries may be found here: https://github.com/mozilla/sccache/blob/ffe3070f77ef3301c8ff718316e4ab017ec83042/src/config.rs#L300.
+
 ## env
 
 Whatever is set by a file based configuration, it is overruled by the env
@@ -147,3 +170,20 @@ The full url appears then as `redis://user:passwd@1.2.3.4:6379/?db=1`.
 * `SCCACHE_GHA_RUNTIME_TOKEN` / `ACTIONS_RUNTIME_TOKEN` GitHub Actions access token
 * `SCCACHE_GHA_CACHE_TO` cache key to write
 * `SCCACHE_GHA_CACHE_FROM` comma separated list of cache keys to read from
+
+#### webdav
+
+* `SCCACHE_WEBDAV_ENDPOINT`
+* `SCCACHE_WEBDAV_KEY_PREFIX`
+* `SCCACHE_WEBDAV_USERNAME`
+* `SCCACHE_WEBDAV_PASSWORD`
+* `SCCACHE_WEBDAV_TOKEN`
+
+#### OSS
+
+* `SCCACHE_OSS_BUCKET`
+* `SCCACHE_OSS_ENDPOINT`
+* `SCCACHE_OSS_KEY_PREFIX`
+* `ALIBABA_CLOUD_ACCESS_KEY_ID`
+* `ALIBABA_CLOUD_ACCESS_KEY_SECRET`
+* `SCCACHE_OSS_NO_CREDENTIALS`

src/cache/cache.rs

@@ -602,17 +602,22 @@ pub fn storage_from_config(
             CacheType::Memcached(config::MemcachedCacheConfig {
                 ref url,
                 ref expiration,
+                ref key_prefix,
             }) => {
                 debug!("Init memcached cache with url {url}");
 
-                let storage = MemcachedCache::build(url, *expiration)
+                let storage = MemcachedCache::build(url, key_prefix, *expiration)
                     .map_err(|err| anyhow!("create memcached cache failed: {err:?}"))?;
                 return Ok(Arc::new(storage));
             }
             #[cfg(feature = "redis")]
-            CacheType::Redis(config::RedisCacheConfig { ref url, ref ttl }) => {
+            CacheType::Redis(config::RedisCacheConfig {
+                ref url,
+                ref ttl,
+                ref key_prefix,
+            }) => {
                 debug!("Init redis cache with url {url}");
-                let storage = RedisCache::build(url, *ttl)
+                let storage = RedisCache::build(url, key_prefix, *ttl)
                     .map_err(|err| anyhow!("create redis cache failed: {err:?}"))?;
                 return Ok(Arc::new(storage));
             }

src/cache/memcached.rs

@@ -25,10 +25,11 @@ use crate::errors::*;
 pub struct MemcachedCache;
 
 impl MemcachedCache {
-    pub fn build(url: &str, expiration: u32) -> Result<Operator> {
+    pub fn build(url: &str, key_prefix: &str, expiration: u32) -> Result<Operator> {
         let mut builder = Memcached::default();
         builder.endpoint(url);
-        builder.default_ttl(Duration::from_secs(expiration as u64));
+        builder.root(key_prefix);
+        builder.default_ttl(Duration::from_secs(expiration.into()));
 
         let op = Operator::new(builder)?
             .layer(LoggingLayer::default())

src/cache/redis.rs

@@ -26,13 +26,14 @@ pub struct RedisCache;
 
 impl RedisCache {
     /// Create a new `RedisCache`.
-    pub fn build(url: &str, ttl: u64) -> Result<Operator> {
+    pub fn build(url: &str, key_prefix: &str, ttl: u64) -> Result<Operator> {
         let parsed = Url::parse(url)?;
 
         let mut builder = Redis::default();
         builder.endpoint(parsed.as_str());
         builder.username(parsed.username());
         builder.password(parsed.password().unwrap_or_default());
+        builder.root(key_prefix);
         if ttl != 0 {
             builder.default_ttl(Duration::from_secs(ttl));
         }

src/config.rs

@@ -224,15 +224,24 @@ pub struct GHACacheConfig {
 /// Please change this value freely if we have a better choice.
 const DEFAULT_MEMCACHED_CACHE_EXPIRATION: u32 = 86400;
 
+fn default_memcached_cache_expiration() -> u32 {
+    DEFAULT_MEMCACHED_CACHE_EXPIRATION
+}
+
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct MemcachedCacheConfig {
     pub url: String,
+
     /// the expiration time in seconds.
     ///
     /// Default to 24 hours (86400)
     /// Up to 30 days (2592000)
+    #[serde(default = "default_memcached_cache_expiration")]
     pub expiration: u32,
+
+    #[serde(default)]
+    pub key_prefix: String,
 }
 
 /// redis has no default TTL - all caches live forever
@@ -245,17 +254,22 @@ const DEFAULT_REDIS_CACHE_TTL: u64 = 0;
 #[serde(deny_unknown_fields)]
 pub struct RedisCacheConfig {
     pub url: String,
-    /// the ttl time in seconds.
+
+    /// the ttl (expiration) time in seconds.
     ///
     /// Default to infinity (0)
-    #[serde(default)]
+    #[serde(default, alias = "expiration")]
     pub ttl: u64,
+
+    #[serde(default)]
+    pub key_prefix: String,
 }
 
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct WebdavCacheConfig {
     pub endpoint: String,
+    #[serde(default)]
     pub key_prefix: String,
     pub username: Option<String>,
     pub password: Option<String>,
@@ -267,6 +281,7 @@ pub struct WebdavCacheConfig {
 pub struct S3CacheConfig {
     pub bucket: String,
     pub region: Option<String>,
+    #[serde(default)]
     pub key_prefix: String,
     pub no_credentials: bool,
     pub endpoint: Option<String>,
@@ -278,6 +293,7 @@ pub struct S3CacheConfig {
 #[serde(deny_unknown_fields)]
 pub struct OSSCacheConfig {
     pub bucket: String,
+    #[serde(default)]
     pub key_prefix: String,
     pub endpoint: Option<String>,
     pub no_credentials: bool,
@@ -610,9 +626,11 @@ fn config_from_env() -> Result<EnvConfig> {
             .map_err(|err| anyhow!("SCCACHE_REDIS_TTL value is invalid: {err:?}"))?,
         Err(_) => DEFAULT_REDIS_CACHE_TTL,
     };
-    let redis = env::var("SCCACHE_REDIS")
-        .ok()
-        .map(|url| RedisCacheConfig { url, ttl });
+    let redis = env::var("SCCACHE_REDIS").ok().map(|url| RedisCacheConfig {
+        url,
+        ttl,
+        key_prefix: String::new(),
+    });
 
     // ======= memcached =======
     let expiration = match env::var("SCCACHE_MEMCACHED_EXPIRATION").ok() {
@@ -624,7 +642,11 @@ fn config_from_env() -> Result<EnvConfig> {
 
     let memcached = env::var("SCCACHE_MEMCACHED")
         .ok()
-        .map(|url| MemcachedCacheConfig { url, expiration });
+        .map(|url| MemcachedCacheConfig {
+            url,
+            expiration,
+            key_prefix: String::new(),
+        });
 
     // ======= GCP/GCS =======
     if (env::var("SCCACHE_GCS_CREDENTIALS_URL").is_ok()
@@ -1180,6 +1202,7 @@ fn config_overrides() {
             redis: Some(RedisCacheConfig {
                 url: "myotherredisurl".to_owned(),
                 ttl: 24 * 3600,
+                key_prefix: String::new(),
             }),
             ..Default::default()
         },
@@ -1196,10 +1219,12 @@ fn config_overrides() {
             memcached: Some(MemcachedCacheConfig {
                 url: "memurl".to_owned(),
                 expiration: 24 * 3600,
+                key_prefix: String::new(),
             }),
             redis: Some(RedisCacheConfig {
                 url: "myredisurl".to_owned(),
                 ttl: 24 * 3600,
+                key_prefix: String::new(),
             }),
             ..Default::default()
         },
@@ -1213,6 +1238,7 @@ fn config_overrides() {
             cache: Some(CacheType::Redis(RedisCacheConfig {
                 url: "myotherredisurl".to_owned(),
                 ttl: 24 * 3600,
+                key_prefix: String::new(),
             }),),
             fallback_cache: DiskCacheConfig {
                 dir: "/env-cache".into(),
@@ -1373,12 +1399,14 @@ enabled = true
 version = "sccache"
 
 [cache.memcached]
-url = "..."
-expiration = 86400
+url = "127.0.0.1:11211"
+expiration = 90000
+key_prefix = "/custom/prefix/if/need"
 
 [cache.redis]
 url = "redis://user:passwd@1.2.3.4:6379/1"
-ttl = 86400
+expiration = 86400
+key_prefix = "/my/redis/cache"
 
 [cache.s3]
 bucket = "name"
@@ -1430,10 +1458,12 @@ no_credentials = true
                 redis: Some(RedisCacheConfig {
                     url: "redis://user:passwd@1.2.3.4:6379/1".to_owned(),
                     ttl: 24 * 3600,
+                    key_prefix: "/my/redis/cache".into(),
                 }),
                 memcached: Some(MemcachedCacheConfig {
-                    url: "...".to_owned(),
-                    expiration: 24 * 3600
+                    url: "127.0.0.1:11211".to_owned(),
+                    expiration: 25 * 3600,
+                    key_prefix: "/custom/prefix/if/need".into(),
                 }),
                 s3: Some(S3CacheConfig {
                     bucket: "name".to_owned(),