Fix cache attribute parsing

PROPOSALS.md

@@ -15,16 +15,6 @@ These additions are backwards-compatible as specified in [RFC 2045](https://tool
 
 The terms MAY, SHOULD and SHOULD NOT are defined in [RFC 2119](https://tools.ietf.org/html/rfc2119).
 
-# Size
-
-Gemini servers SHOULD include the size (in bytes) of the response body when the
-request is successful. Clients SHOULD utilize this information when downloading
-files to indicate progress.
-
-```
-20 text/gemini; charset=utf-8; size=1108
-```
-
 # Cache
 
 Gemini servers MAY include a duration (in seconds) which a client SHOULD cache
@@ -42,3 +32,13 @@ Do not cache:
 ```
 20 text/gemini; charset=utf-8; cache=0
 ```
+
+# Size
+
+Gemini servers SHOULD include the size (in bytes) of the response body when the
+request is successful. Clients SHOULD utilize this information when downloading
+files to indicate progress.
+
+```
+20 text/gemini; charset=utf-8; size=1108
+```

config.go

@@ -38,13 +38,14 @@ type pathConfig struct {
 	Type string
 
 	// Cache duration
-	Cache int64 `default:"-1965"`
+	Cache string
 
 	// FastCGI server address
 	FastCGI string
 
 	r     *regexp.Regexp
 	cmd   []string
+	cache int64
 }
 
 type hostConfig struct {
@@ -69,6 +70,8 @@ type serverConfig struct {
 	fcgiPools map[string]gofast.ConnFactory
 }
 
+const cacheUnset = -1965
+
 var config *serverConfig
 
 func readconfig(configPath string) error {
@@ -139,6 +142,14 @@ func readconfig(configPath string) error {
 				serve.r = regexp.MustCompile(serve.Path)
 			}
 
+			serve.cache = cacheUnset
+			if serve.Cache != "" {
+				serve.cache, err = strconv.ParseInt(serve.Cache, 10, 64)
+				if err != nil {
+					log.Fatalf("failed to parse cache duration for path %s: %s", serve.Path, err)
+				}
+			}
+
 			if serve.FastCGI != "" {
 				if serve.Root == "" {
 					log.Fatalf("root must be specified to use fastcgi resource %s of path %s%s", serve.FastCGI, hostname, serve.Path)

server.go

@@ -86,8 +86,8 @@ func writeSuccess(c net.Conn, serve *pathConfig, contentType string, size int64)
 		meta += fmt.Sprintf("; size=%d", size)
 	}
 
-	if serve.Cache != -1965 {
-		meta += fmt.Sprintf("; cache=%d", serve.Cache)
+	if serve.cache != cacheUnset {
+		meta += fmt.Sprintf("; cache=%d", serve.cache)
 	}
 
 	writeHeader(c, statusSuccess, meta)