diff options
Diffstat (limited to 'guix/store.scm')
| -rw-r--r-- | guix/store.scm | 68 |
1 files changed, 61 insertions, 7 deletions
diff --git a/guix/store.scm b/guix/store.scm index b1bdbf3813..9dc651b26c 100644 --- a/guix/store.scm +++ b/guix/store.scm @@ -23,6 +23,7 @@ #:use-module (guix memoization) #:use-module (guix serialization) #:use-module (guix monads) + #:use-module (guix records) #:use-module (guix base16) #:use-module (guix base32) #:use-module (gcrypt hash) @@ -30,6 +31,7 @@ #:autoload (guix build syscalls) (terminal-columns) #:use-module (rnrs bytevectors) #:use-module (ice-9 binary-ports) + #:use-module ((ice-9 control) #:select (let/ec)) #:use-module (srfi srfi-1) #:use-module (srfi srfi-9) #:use-module (srfi srfi-9 gnu) @@ -55,6 +57,7 @@ nix-server-minor-version nix-server-socket current-store-protocol-version ;for internal use + mcached &nix-error nix-error? &nix-connection-error nix-connection-error? @@ -332,10 +335,7 @@ ;; remote-store.cc -(define-record-type <nix-server> - (%make-nix-server socket major minor - buffer flush - ats-cache atts-cache) +(define-record-type* <nix-server> nix-server %make-nix-server nix-server? (socket nix-server-socket) (major nix-server-major-version) @@ -348,7 +348,9 @@ ;; during the session are temporary GC roots kept for the duration of ;; the session. (ats-cache nix-server-add-to-store-cache) - (atts-cache nix-server-add-text-to-store-cache)) + (atts-cache nix-server-add-text-to-store-cache) + (object-cache nix-server-object-cache + (default vlist-null))) ;vhash (set-record-type-printer! <nix-server> (lambda (obj port) @@ -523,7 +525,8 @@ for this connection will be pinned. Return a server object." (protocol-minor v) output flush (make-hash-table 100) - (make-hash-table 100)))) + (make-hash-table 100) + vlist-null))) (let loop ((done? (process-stderr conn))) (or done? (process-stderr conn))) conn))))))))) @@ -543,7 +546,8 @@ connection. Use with care." (protocol-minor version) output flush (make-hash-table 100) - (make-hash-table 100)))) + (make-hash-table 100) + vlist-null))) (define (nix-server-version store) "Return the protocol version of STORE as an integer." @@ -1486,6 +1490,56 @@ This makes sense only when the daemon was started with '--cache-failures'." ;; from %STATE-MONAD. (template-directory instantiations %store-monad) +(define* (cache-object-mapping object keys result) + "Augment the store's object cache with a mapping from OBJECT/KEYS to RESULT. +KEYS is a list of additional keys to match against, for instance a (SYSTEM +TARGET) tuple. + +OBJECT is typically a high-level object such as a <package> or an <origin>, +and RESULT is typically its derivation." + (lambda (store) + (values result + (nix-server + (inherit store) + (object-cache (vhash-consq object (cons result keys) + (nix-server-object-cache store))))))) + +(define* (lookup-cached-object object #:optional (keys '())) + "Return the cached object in the store connection corresponding to OBJECT +and KEYS. KEYS is a list of additional keys to match against, and which are +compared with 'equal?'. Return #f on failure and the cached result +otherwise." + (lambda (store) + ;; Escape as soon as we find the result. This avoids traversing the whole + ;; vlist chain and significantly reduces the number of 'hashq' calls. + (values (let/ec return + (vhash-foldq* (lambda (item result) + (match item + ((value . keys*) + (if (equal? keys keys*) + (return value) + result)))) + #f object + (nix-server-object-cache store))) + store))) + +(define* (%mcached mthunk object #:optional (keys '())) + "Bind the monadic value returned by MTHUNK, which supposedly corresponds to +OBJECT/KEYS, or return its cached value." + (mlet %store-monad ((cached (lookup-cached-object object keys))) + (if cached + (return cached) + (>>= (mthunk) + (lambda (result) + (cache-object-mapping object keys result)))))) + +(define-syntax-rule (mcached mvalue object keys ...) + "Run MVALUE, which corresponds to OBJECT/KEYS, and cache it; or return the +value associated with OBJECT/KEYS in the store's object cache if there is +one." + (%mcached (lambda () mvalue) + object (list keys ...))) + (define (preserve-documentation original proc) "Return PROC with documentation taken from ORIGINAL." (set-object-property! proc 'documentation |