[PATCH v4 1/4] lxc: refactor lxcNetworkParseData pointers to use new structures

[Julio Faracco]

Struct lxcNetworkParseData is being used as a single pointer which
iterates through LXC config lines. It means that it will be applied as a
network each time that a new type appears. After, the same struct is
used to populate a new network interface. This commit changes this logic
to multiple lxcNetworkParseData to move this strcuture to an array. It
makes more sense if we are using indexes to fill interface settings.
This is better to improve code clarity.

This commit still introduces *Legacy() functions to keep support of
network old style definitions.

Signed-off-by: Julio Faracco <jcfaracco at gmail.com>
---
 src/lxc/lxc_native.c | 140 ++++++++++++++++++++++++-------------------
 1 file changed, 77 insertions(+), 63 deletions(-)

diff --git a/src/lxc/lxc_native.c b/src/lxc/lxc_native.c
index dd2345c324..31aa666e38 100644
--- a/src/lxc/lxc_native.c
+++ b/src/lxc/lxc_native.c
@@ -411,7 +411,9 @@ lxcCreateHostdevDef(int mode, int type, const char *data)
     return hostdev;
 }
 
-typedef struct {
+typedef struct _lxcNetworkParseData lxcNetworkParseData;
+typedef lxcNetworkParseData *lxcNetworkParseDataPtr;
+struct _lxcNetworkParseData {
     virDomainDefPtr def;
     char *type;
     char *link;
@@ -424,9 +426,14 @@ typedef struct {
     size_t nips;
     char *gateway_ipv4;
     char *gateway_ipv6;
-    bool privnet;
-    size_t networks;
-} lxcNetworkParseData;
+    size_t index;
+};
+
+typedef struct {
+    size_t ndata;
+    lxcNetworkParseDataPtr *parseData;
+} lxcNetworkParseDataArray;
+
 
 static int
 lxcAddNetworkRouteDefinition(const char *address,
@@ -552,39 +559,6 @@ lxcAddNetworkDefinition(lxcNetworkParseData *data)
 }
 
 
-static int
-lxcNetworkParseDataType(virConfValuePtr value,
-                        lxcNetworkParseData *parseData)
-{
-    virDomainDefPtr def = parseData->def;
-    size_t networks = parseData->networks;
-    bool privnet = parseData->privnet;
-    int status;
-
-    /* Store the previous NIC */
-    status = lxcAddNetworkDefinition(parseData);
-
-    if (status < 0)
-        return -1;
-    else if (status > 0)
-        networks++;
-    else if (parseData->type != NULL && STREQ(parseData->type, "none"))
-        privnet = false;
-
-    /* clean NIC to store a new one */
-    memset(parseData, 0, sizeof(*parseData));
-
-    parseData->def = def;
-    parseData->networks = networks;
-    parseData->privnet = privnet;
-
-    /* Keep the new value */
-    parseData->type = value->str;
-
-    return 0;
-}
-
-
 static int
 lxcNetworkParseDataIPs(const char *name,
                        virConfValuePtr value,
@@ -633,8 +607,7 @@ lxcNetworkParseDataSuffix(const char *entry,
 
     switch (elem) {
     case VIR_LXC_NETWORK_CONFIG_TYPE:
-        if (lxcNetworkParseDataType(value, parseData) < 0)
-            return -1;
+        parseData->type = value->str;
         break;
     case VIR_LXC_NETWORK_CONFIG_LINK:
         parseData->link = value->str;
@@ -676,12 +649,40 @@ lxcNetworkParseDataSuffix(const char *entry,
 }
 
 
+static lxcNetworkParseDataPtr
+lxcNetworkGetParseDataByIndexLegacy(lxcNetworkParseDataArray *networks,
+                                    const char *entry)
+{
+    int elem = virLXCNetworkConfigEntryTypeFromString(entry);
+    size_t ndata = networks->ndata;
+
+    if (elem == VIR_LXC_NETWORK_CONFIG_TYPE) {
+        /* Index was not found. So, it is time to add new *
+         * interface and return this last position.       */
+        if (VIR_EXPAND_N(networks->parseData, networks->ndata, 1) < 0)
+            return NULL;
+
+        networks->parseData[ndata] = g_new0(lxcNetworkParseData, 1);
+        networks->parseData[ndata]->index = networks->ndata;
+
+        return networks->parseData[ndata];
+    }
+
+    /* Return last element added like a stack. */
+    return networks->parseData[ndata - 1];
+}
+
+
 static int
-lxcNetworkParseDataEntry(const char *name,
-                         virConfValuePtr value,
-                         lxcNetworkParseData *parseData)
+lxcNetworkParseDataEntryLegacy(const char *name,
+                               virConfValuePtr value,
+                               lxcNetworkParseDataArray *networks)
 {
     const char *suffix = STRSKIP(name, "lxc.network.");
+    lxcNetworkParseData *parseData;
+
+    if (!(parseData = lxcNetworkGetParseDataByIndexLegacy(networks, suffix)))
+        return -1;
 
     return lxcNetworkParseDataSuffix(suffix, value, parseData);
 }
@@ -690,10 +691,10 @@ lxcNetworkParseDataEntry(const char *name,
 static int
 lxcNetworkWalkCallback(const char *name, virConfValuePtr value, void *data)
 {
-    lxcNetworkParseData *parseData = data;
+    lxcNetworkParseDataArray *networks = data;
 
     if (STRPREFIX(name, "lxc.network."))
-        return lxcNetworkParseDataEntry(name, value, parseData);
+        return lxcNetworkParseDataEntryLegacy(name, value, networks);
 
     return 0;
 }
@@ -702,36 +703,49 @@ static int
 lxcConvertNetworkSettings(virDomainDefPtr def, virConfPtr properties)
 {
     int status;
-    size_t i;
-    lxcNetworkParseData data = {def, NULL, NULL, NULL, NULL,
-                                NULL, NULL, NULL, NULL, 0,
-                                NULL, NULL, true, 0};
+    bool privnet = true;
+    size_t i, j;
+    lxcNetworkParseDataArray networks = {0, NULL};
+    int ret = -1;
+
+    networks.parseData = g_new0(lxcNetworkParseDataPtr, 1);
 
-    if (virConfWalk(properties, lxcNetworkWalkCallback, &data) < 0)
+    if (virConfWalk(properties, lxcNetworkWalkCallback, &networks) < 0)
         goto error;
 
+    for (i = 0; i < networks.ndata; i++) {
+        lxcNetworkParseDataPtr data = networks.parseData[i];
+        data->def = def;
 
-    /* Add the last network definition found */
-    status = lxcAddNetworkDefinition(&data);
+        status = lxcAddNetworkDefinition(data);
 
-    if (status < 0)
-        goto error;
-    else if (status > 0)
-        data.networks++;
-    else if (data.type != NULL && STREQ(data.type, "none"))
-        data.privnet = false;
+        if (status < 0)
+            goto error;
+        else if (data->type != NULL && STREQ(data->type, "none"))
+            privnet = false;
+    }
 
-    if (data.networks == 0 && data.privnet) {
+    if (networks.ndata == 0 && privnet) {
         /* When no network type is provided LXC only adds loopback */
         def->features[VIR_DOMAIN_FEATURE_PRIVNET] = VIR_TRISTATE_SWITCH_ON;
     }
-    return 0;
+
+    ret = 0;
+
+ cleanup:
+    for (i = 0; i < networks.ndata; i++)
+        VIR_FREE(networks.parseData[i]);
+    VIR_FREE(networks.parseData);
+    return ret;
 
  error:
-    for (i = 0; i < data.nips; i++)
-        VIR_FREE(data.ips[i]);
-    VIR_FREE(data.ips);
-    return -1;
+    for (i = 0; i < networks.ndata; i++) {
+        lxcNetworkParseDataPtr data = networks.parseData[i];
+        for (j = 0; j < data->nips; j++)
+            VIR_FREE(data->ips[j]);
+        VIR_FREE(data->ips);
+    }
+    goto cleanup;
 }
 
 static int
-- 
2.20.1