[libvirt RFC PATCH 05/10] util: storage: Add json pseudo protocol support for gluster volumes

[Peter Krempa <pkrempa@xxxxxxxxxx>]

Extract the common code of the URI parser and reuse it with gluster
volumes. The gluster code has a separate function as multi-host support
will add an alternative to the URI syntax.
---
 src/util/virstoragefile.c | 52 +++++++++++++++++++++++++++++++++++++----------
 tests/virstoragetest.c    |  5 +++++
 2 files changed, 46 insertions(+), 11 deletions(-)

diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index f8c5f64..6aaf3ff 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -2538,18 +2538,10 @@ virStorageSourceParseBackingJSONPath(virStorageSourcePtr src,


 static int
-virStorageSourceParseBackingJSONUri(virStorageSourcePtr src,
-                                    virJSONValuePtr json,
-                                    int protocol)
+virStorageSourceParseBackingJSONUriStr(virStorageSourcePtr src,
+                                       const char *uri,
+                                       int protocol)
 {
-    const char *uri;
-
-    if (!(uri = virJSONValueObjectGetString(json, "file.uri"))) {
-        virReportError(VIR_ERR_INVALID_ARG, "%s",
-                       _("missing URI in JSON backing volume definition"));
-        return -1;
-    }
-
     if (virStorageSourceParseBackingURI(src, uri) < 0)
         return -1;

@@ -2566,6 +2558,43 @@ virStorageSourceParseBackingJSONUri(virStorageSourcePtr src,
 }


+static int
+virStorageSourceParseBackingJSONUri(virStorageSourcePtr src,
+                                    virJSONValuePtr json,
+                                    int protocol)
+{
+    const char *uri;
+
+    if (!(uri = virJSONValueObjectGetString(json, "file.uri"))) {
+        virReportError(VIR_ERR_INVALID_ARG, "%s",
+                       _("missing URI in JSON backing volume definition"));
+        return -1;
+    }
+
+    return virStorageSourceParseBackingJSONUriStr(src, uri, protocol);
+}
+
+
+static int
+virStorageSourceParseBackingJSONGluster(virStorageSourcePtr src,
+                                        virJSONValuePtr json,
+                                        int opaque ATTRIBUTE_UNUSED)
+{
+    const char *uri;
+
+    /* legacy URI based syntax passed via 'filename' option */
+    if ((uri = virJSONValueObjectGetString(json, "file.filename")))
+        return virStorageSourceParseBackingJSONUriStr(src, uri,
+                                                      VIR_STORAGE_NET_PROTOCOL_GLUSTER);
+
+    /* gluster currently supports only URI syntax passed in as filename */
+    virReportError(VIR_ERR_INVALID_ARG, "%s",
+                   _("missing gluster URI in JSON backing volume definition"));
+
+    return -1;
+}
+
+
 struct virStorageSourceJSONDriverParser {
     const char *drvname;
     int (*func)(virStorageSourcePtr src, virJSONValuePtr json, int opaque);
@@ -2581,6 +2610,7 @@ static const struct virStorageSourceJSONDriverParser jsonParsers[] = {
     {"ftp", virStorageSourceParseBackingJSONUri, VIR_STORAGE_NET_PROTOCOL_FTP},
     {"ftps", virStorageSourceParseBackingJSONUri, VIR_STORAGE_NET_PROTOCOL_FTPS},
     {"tftp", virStorageSourceParseBackingJSONUri, VIR_STORAGE_NET_PROTOCOL_TFTP},
+    {"gluster", virStorageSourceParseBackingJSONGluster, 0},
 };


diff --git a/tests/virstoragetest.c b/tests/virstoragetest.c
index 955e4db..4250a2f 100644
--- a/tests/virstoragetest.c
+++ b/tests/virstoragetest.c
@@ -1375,6 +1375,11 @@ mymain(void)
     TEST_BACKING_PARSE(14, "json:{\"file.driver\":\"ftp\", "
                                  "\"file.uri\":\"http://example.com/file\"}";,
                        NULL);
+    TEST_BACKING_PARSE(15, "json:{\"file.driver\":\"gluster\", "
+                                 "\"file.filename\":\"gluster://example.com/vol/file\"}",
+                       "<source protocol='gluster' name='vol/file'>\n"
+                       "  <host name='example.com'/>\n"
+                       "</source>\n");

  cleanup:
     /* Final cleanup */
-- 
2.8.2

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