root / trunk / Pithos.Core / Agents / FileAgent.cs @ 5e31048f
History | View | Annotate | Download (12.8 kB)
1 |
using System; |
---|---|
2 |
using System.Collections.Generic; |
3 |
using System.ComponentModel.Composition; |
4 |
using System.Diagnostics; |
5 |
using System.Diagnostics.Contracts; |
6 |
using System.IO; |
7 |
using System.Linq; |
8 |
using System.Text; |
9 |
using System.Threading.Tasks; |
10 |
using System.Threading.Tasks.Dataflow; |
11 |
using Pithos.Interfaces; |
12 |
using Pithos.Network; |
13 |
using log4net; |
14 |
using log4net.Core; |
15 |
|
16 |
namespace Pithos.Core.Agents |
17 |
{ |
18 |
[Export] |
19 |
public class FileAgent |
20 |
{ |
21 |
//Agent<WorkflowState> _agent; |
22 |
TransformBlock<WorkflowState, WorkflowState> _agent; |
23 |
private FileSystemWatcher _watcher; |
24 |
|
25 |
[Import] |
26 |
public IStatusKeeper StatusKeeper { get; set; } |
27 |
[Import] |
28 |
public IPithosWorkflow Workflow { get; set; } |
29 |
[Import] |
30 |
public WorkflowAgent WorkflowAgent { get; set; } |
31 |
|
32 |
private AccountInfo AccountInfo { get; set; } |
33 |
|
34 |
private string RootPath { get; set; } |
35 |
|
36 |
private static readonly ILog Log = LogManager.GetLogger("FileAgent"); |
37 |
|
38 |
public FileAgent() |
39 |
{ |
40 |
_agent = new TransformBlock<WorkflowState, WorkflowState>(async message => |
41 |
await TaskEx.Run(()=>Process(message))); |
42 |
} |
43 |
|
44 |
private WorkflowState Process(WorkflowState message) |
45 |
{ |
46 |
Debug.Assert(!Ignore(message.Path)); |
47 |
|
48 |
try |
49 |
{ |
50 |
//Skip if the file is already being downloaded or uploaded and |
51 |
//the change is create or modify |
52 |
var networkState = NetworkGate.GetNetworkState(message.Path); |
53 |
if (networkState != NetworkOperation.None && |
54 |
(message.TriggeringChange == WatcherChangeTypes.Created || |
55 |
message.TriggeringChange == WatcherChangeTypes.Changed)) |
56 |
return null; |
57 |
|
58 |
UpdateFileStatus(message); |
59 |
UpdateOverlayStatus(message); |
60 |
UpdateFileChecksum(message); |
61 |
return message; |
62 |
} |
63 |
catch (IOException exc) |
64 |
{ |
65 |
if (File.Exists(message.Path)) |
66 |
{ |
67 |
Log.WarnFormat("File access error occured, retrying {0}\n{1}", message.Path, exc); |
68 |
_agent.Post(message); |
69 |
} |
70 |
else |
71 |
{ |
72 |
Log.WarnFormat("File {0} does not exist. Will be ignored\n{1}", message.Path, exc); |
73 |
} |
74 |
} |
75 |
catch (Exception exc) |
76 |
{ |
77 |
Log.WarnFormat("Error occured while indexing{0}. The file will be skipped}\n{1}", |
78 |
message.Path, exc); |
79 |
} |
80 |
|
81 |
return null; |
82 |
} |
83 |
|
84 |
public void Start(AccountInfo accountInfo,string rootPath) |
85 |
{ |
86 |
if (accountInfo==null) |
87 |
throw new ArgumentNullException("accountInfo"); |
88 |
if (String.IsNullOrWhiteSpace(rootPath)) |
89 |
throw new ArgumentNullException("rootPath"); |
90 |
if (!Path.IsPathRooted(rootPath)) |
91 |
throw new ArgumentException("rootPath must be an absolute path","rootPath"); |
92 |
Contract.EndContractBlock(); |
93 |
|
94 |
_agent.LinkTo(WorkflowAgent.Agent); |
95 |
|
96 |
AccountInfo = accountInfo; |
97 |
RootPath = rootPath; |
98 |
_watcher = new FileSystemWatcher(rootPath); |
99 |
_watcher.IncludeSubdirectories = true; |
100 |
_watcher.Changed += OnFileEvent; |
101 |
_watcher.Created += OnFileEvent; |
102 |
_watcher.Deleted += OnFileEvent; |
103 |
_watcher.Renamed += OnRenameEvent; |
104 |
_watcher.EnableRaisingEvents = true; |
105 |
|
106 |
} |
107 |
|
108 |
public bool Pause |
109 |
{ |
110 |
get { return _watcher == null || !_watcher.EnableRaisingEvents; } |
111 |
set |
112 |
{ |
113 |
if (_watcher != null) |
114 |
_watcher.EnableRaisingEvents = !value; |
115 |
} |
116 |
} |
117 |
|
118 |
public string CachePath { get; set; } |
119 |
|
120 |
private List<string> _selectivePaths = new List<string>(); |
121 |
public List<string> SelectivePaths |
122 |
{ |
123 |
get { return _selectivePaths; } |
124 |
set { _selectivePaths = value; } |
125 |
} |
126 |
|
127 |
|
128 |
public void Post(WorkflowState workflowState) |
129 |
{ |
130 |
if (workflowState == null) |
131 |
throw new ArgumentNullException("workflowState"); |
132 |
Contract.EndContractBlock(); |
133 |
|
134 |
_agent.Post(workflowState); |
135 |
} |
136 |
|
137 |
public void Stop() |
138 |
{ |
139 |
if (_watcher != null) |
140 |
{ |
141 |
_watcher.Changed -= OnFileEvent; |
142 |
_watcher.Created -= OnFileEvent; |
143 |
_watcher.Deleted -= OnFileEvent; |
144 |
_watcher.Renamed -= OnRenameEvent; |
145 |
_watcher.Dispose(); |
146 |
} |
147 |
_watcher = null; |
148 |
|
149 |
if (_agent!=null) |
150 |
_agent.Complete(); |
151 |
} |
152 |
|
153 |
// Enumerate all files in the Pithos directory except those in the Fragment folder |
154 |
// and files with a .ignore extension |
155 |
public IEnumerable<string> EnumerateFiles(string searchPattern="*") |
156 |
{ |
157 |
var monitoredFiles = from filePath in Directory.EnumerateFileSystemEntries(RootPath, searchPattern, SearchOption.AllDirectories) |
158 |
where !Ignore(filePath) |
159 |
select filePath; |
160 |
return monitoredFiles; |
161 |
} |
162 |
|
163 |
public IEnumerable<FileInfo> EnumerateFileInfos(string searchPattern="*") |
164 |
{ |
165 |
var rootDir = new DirectoryInfo(RootPath); |
166 |
var monitoredFiles = from file in rootDir.EnumerateFiles(searchPattern, SearchOption.AllDirectories) |
167 |
where !Ignore(file.FullName) |
168 |
select file; |
169 |
return monitoredFiles; |
170 |
} |
171 |
|
172 |
public IEnumerable<string> EnumerateFilesAsRelativeUrls(string searchPattern="*") |
173 |
{ |
174 |
var rootDir = new DirectoryInfo(RootPath); |
175 |
var monitoredFiles = from file in rootDir.EnumerateFiles(searchPattern, SearchOption.AllDirectories) |
176 |
where !Ignore(file.FullName) |
177 |
select file.AsRelativeUrlTo(RootPath); |
178 |
return monitoredFiles; |
179 |
} |
180 |
|
181 |
|
182 |
|
183 |
|
184 |
private bool Ignore(string filePath) |
185 |
{ |
186 |
if (filePath.StartsWith(CachePath)) |
187 |
return true; |
188 |
if (_ignoreFiles.ContainsKey(filePath.ToLower())) |
189 |
return true; |
190 |
return false; |
191 |
} |
192 |
|
193 |
//Post a Change message for all events except rename |
194 |
void OnFileEvent(object sender, FileSystemEventArgs e) |
195 |
{ |
196 |
//Ignore events that affect the cache folder |
197 |
var filePath = e.FullPath; |
198 |
if (Ignore(filePath)) |
199 |
return; |
200 |
|
201 |
_agent.Post(new WorkflowState{AccountInfo=AccountInfo, Path = filePath, FileName = e.Name, TriggeringChange = e.ChangeType }); |
202 |
} |
203 |
|
204 |
|
205 |
//Post a Change message for renames containing the old and new names |
206 |
void OnRenameEvent(object sender, RenamedEventArgs e) |
207 |
{ |
208 |
var oldFullPath = e.OldFullPath; |
209 |
var fullPath = e.FullPath; |
210 |
if (Ignore(oldFullPath) || Ignore(fullPath)) |
211 |
return; |
212 |
|
213 |
_agent.Post(new WorkflowState |
214 |
{ |
215 |
AccountInfo=AccountInfo, |
216 |
OldPath = oldFullPath, |
217 |
OldFileName = e.OldName, |
218 |
Path = fullPath, |
219 |
FileName = e.Name, |
220 |
TriggeringChange = e.ChangeType |
221 |
}); |
222 |
} |
223 |
|
224 |
|
225 |
|
226 |
private Dictionary<WatcherChangeTypes, FileStatus> _statusDict = new Dictionary<WatcherChangeTypes, FileStatus> |
227 |
{ |
228 |
{WatcherChangeTypes.Created,FileStatus.Created}, |
229 |
{WatcherChangeTypes.Changed,FileStatus.Modified}, |
230 |
{WatcherChangeTypes.Deleted,FileStatus.Deleted}, |
231 |
{WatcherChangeTypes.Renamed,FileStatus.Renamed} |
232 |
}; |
233 |
|
234 |
private Dictionary<string,string> _ignoreFiles=new Dictionary<string, string>(); |
235 |
|
236 |
private WorkflowState UpdateFileStatus(WorkflowState state) |
237 |
{ |
238 |
if (state==null) |
239 |
throw new ArgumentNullException("state"); |
240 |
if (String.IsNullOrWhiteSpace(state.Path)) |
241 |
throw new ArgumentException("The state's Path can't be empty","state"); |
242 |
Contract.EndContractBlock(); |
243 |
|
244 |
var path = state.Path; |
245 |
var status = _statusDict[state.TriggeringChange]; |
246 |
var oldStatus = Workflow.StatusKeeper.GetFileStatus(path); |
247 |
if (status == oldStatus) |
248 |
{ |
249 |
state.Status = status; |
250 |
state.Skip = true; |
251 |
return state; |
252 |
} |
253 |
if (state.Status == FileStatus.Renamed) |
254 |
Workflow.ClearFileStatus(path); |
255 |
|
256 |
state.Status = Workflow.SetFileStatus(path, status); |
257 |
return state; |
258 |
} |
259 |
|
260 |
private WorkflowState UpdateOverlayStatus(WorkflowState state) |
261 |
{ |
262 |
if (state==null) |
263 |
throw new ArgumentNullException("state"); |
264 |
Contract.EndContractBlock(); |
265 |
|
266 |
if (state.Skip) |
267 |
return state; |
268 |
|
269 |
switch (state.Status) |
270 |
{ |
271 |
case FileStatus.Created: |
272 |
case FileStatus.Modified: |
273 |
this.StatusKeeper.SetFileOverlayStatus(state.Path, FileOverlayStatus.Modified); |
274 |
break; |
275 |
case FileStatus.Deleted: |
276 |
//this.StatusAgent.RemoveFileOverlayStatus(state.Path); |
277 |
break; |
278 |
case FileStatus.Renamed: |
279 |
this.StatusKeeper.ClearFileStatus(state.OldPath); |
280 |
this.StatusKeeper.SetFileOverlayStatus(state.Path, FileOverlayStatus.Modified); |
281 |
break; |
282 |
case FileStatus.Unchanged: |
283 |
this.StatusKeeper.SetFileOverlayStatus(state.Path, FileOverlayStatus.Normal); |
284 |
break; |
285 |
} |
286 |
|
287 |
if (state.Status == FileStatus.Deleted) |
288 |
NativeMethods.RaiseChangeNotification(Path.GetDirectoryName(state.Path)); |
289 |
else |
290 |
NativeMethods.RaiseChangeNotification(state.Path); |
291 |
return state; |
292 |
} |
293 |
|
294 |
|
295 |
private WorkflowState UpdateFileChecksum(WorkflowState state) |
296 |
{ |
297 |
if (state.Skip) |
298 |
return state; |
299 |
|
300 |
if (state.Status == FileStatus.Deleted) |
301 |
return state; |
302 |
|
303 |
var path = state.Path; |
304 |
//Skip calculation for folders |
305 |
if (Directory.Exists(path)) |
306 |
return state; |
307 |
|
308 |
var info = new FileInfo(path); |
309 |
string hash = info.CalculateHash(StatusKeeper.BlockSize,StatusKeeper.BlockHash); |
310 |
StatusKeeper.UpdateFileChecksum(path, hash); |
311 |
|
312 |
state.Hash = hash; |
313 |
return state; |
314 |
} |
315 |
|
316 |
//Does the file exist in the container's local folder? |
317 |
public bool Exists(string relativePath) |
318 |
{ |
319 |
if (String.IsNullOrWhiteSpace(relativePath)) |
320 |
throw new ArgumentNullException("relativePath"); |
321 |
//A RootPath must be set before calling this method |
322 |
if (String.IsNullOrWhiteSpace(RootPath)) |
323 |
throw new InvalidOperationException("RootPath was not set"); |
324 |
Contract.EndContractBlock(); |
325 |
//Create the absolute path by combining the RootPath with the relativePath |
326 |
var absolutePath=Path.Combine(RootPath, relativePath); |
327 |
//Is this a valid file? |
328 |
if (File.Exists(absolutePath)) |
329 |
return true; |
330 |
//Or a directory? |
331 |
if (Directory.Exists(absolutePath)) |
332 |
return true; |
333 |
//Fail if it is neither |
334 |
return false; |
335 |
} |
336 |
|
337 |
public FileInfo GetFileInfo(string relativePath) |
338 |
{ |
339 |
if (String.IsNullOrWhiteSpace(relativePath)) |
340 |
throw new ArgumentNullException("relativePath"); |
341 |
//A RootPath must be set before calling this method |
342 |
if (String.IsNullOrWhiteSpace(RootPath)) |
343 |
throw new InvalidOperationException("RootPath was not set"); |
344 |
Contract.EndContractBlock(); |
345 |
|
346 |
var absolutePath = Path.Combine(RootPath, relativePath); |
347 |
// Debug.Assert(File.Exists(absolutePath),String.Format("Path {0} doesn't exist",absolutePath)); |
348 |
|
349 |
return new FileInfo(absolutePath); |
350 |
|
351 |
} |
352 |
|
353 |
public void Delete(string relativePath) |
354 |
{ |
355 |
var absolutePath = Path.Combine(RootPath, relativePath); |
356 |
if (File.Exists(absolutePath)) |
357 |
{ |
358 |
File.Delete(absolutePath); |
359 |
_ignoreFiles[absolutePath.ToLower()] = absolutePath.ToLower(); |
360 |
} |
361 |
StatusKeeper.ClearFileStatus(absolutePath); |
362 |
} |
363 |
} |
364 |
} |