コード例 #1
0
ファイル: UpdateClient.cs プロジェクト: wtfcolt/game
        /// <summary>
        /// Checks the files provided in the given <see cref="VersionFileList"/> and compares them to the local files
        /// to see what files need to be updated.
        /// </summary>
        /// <param name="vfl">The <see cref="VersionFileList"/> containing the files to be updated.</param>
        /// <returns>The relative paths to the files that need to be updated.</returns>
        IEnumerable <string> FindFilesToUpdate(VersionFileList vfl)
        {
            var ret = new List <string>();

            // Loop through each file
            foreach (var updateFileInfo in vfl.Files)
            {
                // Get the local file path
                var localFilePath = PathHelper.CombineDifferentPaths(Settings.TargetPath, updateFileInfo.FilePath);

                // If the file does not exist, add it
                if (!File.Exists(localFilePath))
                {
                    ret.Add(updateFileInfo.FilePath);
                    continue;
                }

                // Get the info for the local file
                try
                {
                    var localFileInfo = new FileInfo(localFilePath);

                    // If the size of the local file doesn't equal the size of the updated file, avoid
                    // checking the hash and just update it
                    if (localFileInfo.Length != updateFileInfo.Size)
                    {
                        if (log.IsDebugEnabled)
                        {
                            log.DebugFormat(
                                "Update check on file `{0}`: File needs update - size mismatch (current: {1}, expected: {2}).",
                                updateFileInfo.FilePath, localFileInfo.Length, updateFileInfo.Size);
                        }

                        ret.Add(updateFileInfo.FilePath);
                        continue;
                    }

                    // File exists and is of the correct size, so compare the hash of the local file to the expected hash
                    var localFileHash = Hasher.GetFileHash(localFilePath);
                    if (!StringComparer.Ordinal.Equals(localFileHash, updateFileInfo.Hash))
                    {
                        if (log.IsDebugEnabled)
                        {
                            log.DebugFormat(
                                "Update check on file `{0}`: File needs update - hash mismatch (current: {1}, expected: {2}).",
                                updateFileInfo.FilePath, localFileHash, updateFileInfo.Hash);
                        }

                        ret.Add(updateFileInfo.FilePath);
                        continue;
                    }
                }
                catch (IOException ex)
                {
                    const string errmsg =
                        "Failed to analyze file `{0}` to see if it needs to be updated. Will assume update is required. Exception: {1}";

                    if (log.IsErrorEnabled)
                    {
                        log.ErrorFormat(errmsg, updateFileInfo.FilePath, ex);
                    }

                    Debug.Fail(string.Format(errmsg, updateFileInfo.FilePath, ex));

                    // On an IOException, assume the file needs to be updated
                    ret.Add(updateFileInfo.FilePath);
                    continue;
                }

                if (log.IsDebugEnabled)
                {
                    log.DebugFormat("Update check on file `{0}`: file is up-to-date.", updateFileInfo.FilePath);
                }
            }

            if (log.IsInfoEnabled)
            {
                log.InfoFormat("Found `{0}` files needing to be updated.", ret.Count);
            }

            return(ret);
        }