serverside component of admin metadata history

lib/commands/admin-rpc.js

@@ -663,6 +663,26 @@ var getLastChannelTime = function (Env, Server, cb, data) {
     });
 };
 
+var getMetadataHistory = function (Env, Server, cb, data) {
+    var id = Array.isArray(data) && data[1];
+    if (!Core.isValidId(id)) { return void cb('INVALID_CHAN'); }
+
+    var lines = [];
+    Env.msgStore.readChannelMetadata(id, (err, line) => {
+        if (err) { return; }
+        lines.push(line);
+    }, err => {
+        if (err) {
+            Env.Log.error('ADMIN_GET_METADATA_HISTORY', {
+                error: err,
+                id: id,
+            });
+            return void cb(err);
+        }
+        cb(void 0, lines);
+    });
+};
+
 var commands = {
     ACTIVE_SESSIONS: getActiveSessions,
     ACTIVE_PADS: getActiveChannelCount,
@@ -680,6 +700,7 @@ var commands = {
     GET_USER_STORAGE_STATS: getUserStorageStats,
     GET_PIN_LOG_STATUS: getPinLogStatus,
 
+    GET_METADATA_HISTORY: getMetadataHistory,
     GET_STORED_METADATA: getStoredMetadata,
     GET_DOCUMENT_SIZE: getDocumentSize,
     GET_LAST_CHANNEL_TIME: getLastChannelTime,