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-rw-r--r--nvdmirror/sync.go36
1 files changed, 20 insertions, 16 deletions
diff --git a/nvdmirror/sync.go b/nvdmirror/sync.go
index 8cdd4c7..dcbf6a9 100644
--- a/nvdmirror/sync.go
+++ b/nvdmirror/sync.go
@@ -1,7 +1,10 @@
package nvdmirror
-// Sync to destination directory based on given sync configuration and
-// cache. Returns an array of file names which have been updated in the
+//
+// Sync NVD data files to destination directory based on given sync
+// configuration and cache.
+//
+// Returns an array of file names which have been updated in the
// destination directory.
//
// This function does the following:
@@ -16,24 +19,25 @@ package nvdmirror
// 3. Fetch the contents of the changed CVE feeds, CPE match files, and
// the CPE dictionary.
//
-// All HTTP requests are made with the following request headers:
+// All HTTP requests are sent with the following headers:
+//
+// * if-modified-since: The last-modified header from the previous
+// successful response, if it was set.
//
-// * if-modified-since (if the URL was queried previously and the
-// previous successful response had a "last-modified" header).
-// * if-none-match (if the URL was queried previously and the
-// previous successful response had an "etag" header).
-// * user-agent
+// * if-none-match: The etag header from the last successful response,
+// if it was set.
+//
+// * user-agent: User agent from config, or the default user agent if
+// the config value is unspecified.
//
func Sync(config SyncConfig, cache Cache, dstDir string) []string {
// build sync context
ctx := newSyncContext(config, cache, dstDir)
- // fetch updated meta files
- checks := ctx.fetchMetas()
-
- // get syncable URLs
- urls := append(ctx.checkMetas(checks), config.GetCpeDictUrl())
-
- // sync urls and return changed files
- return ctx.syncUrls(urls)
+ // fetch meta files, check for updates, append cpe dictionary URL,
+ // fetch updated files, and then return a list of changed files
+ return ctx.syncUrls(append(
+ ctx.checkMetas(ctx.fetchMetas()),
+ config.GetCpeDictUrl(),
+ ))
}