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annotate TODO @ 165:8ea6b5ddc5a5 noffle

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[svn] * src/lock.h,src/lock.c,src/noffle.c: Add lazy lock release. Only release the lock and close the databases if (a) another process signals us SIGUSR1 indicating it wants the lock, or (b) it is explicitly requested by a call to new function Lock_syncDatabases(). When waiting for the lock, SIGUSR1 the holding process every second. This is all an attempt to minimise the number of times we need to close and open the database. When (ha!) the database is replaced by something that can handle multiple simultaneous writers (with appropriate locking) this won't be necessary.
author bears
date Thu, 25 Jan 2001 13:38:31 +0000
parents 3d243292468d
children 1d92abe57427
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1 -------------------------------------------------------------------------------
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2 NOFFLE Todolist
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3 -------------------------------------------------------------------------------
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4
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5 Urgent
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6 ------
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8 * Has Client_connect resource leaks if it fails?
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9
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10 * Bug: Lock_closeDatabases must do a Cont_write() if dirty and Lock_openDatabases()
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11 should check if it is necessary to reread the group content using a timestamp.
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13 Later
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14 -----
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16 * Make Noffle handle a connection break-down during a fetch more gracefully.
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17 At present it still continues to fetch articles, generating a
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18 retrieving failed article for each article left.
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19
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a0a96e1021c3 [svn] Performance of group database
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20 * Improve performance of group database. Using GDBM is a bad choice,
a0a96e1021c3 [svn] Performance of group database
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21 better use a btree from the Berkeley db library in libc.
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22 This will be a good time for a redesign of the group.h interface
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23 with respect to process concurrency if the simple global locking strategy
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24 will be changed in the future.
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26 * Add "hostname" config option for setting the FQHN in generated message IDs.
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28 * Read timeout when running as server and automatically close if client
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29 does not send data for a longer time.
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31 * Implement simple filter using popen or fifos.
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32
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33 * Make compatible to latest NNTP draft.
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34
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35 * Improve speed of online mode: Keep connection to server open for a while
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37 * Check all in
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38 http://mars.superlink.net/user/tal/writings/news-software-authors.html
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39 (Use NOV library? Use inews for validating posted articles? ... )
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41 * Store requested articles by group + number. This would allow to create
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42 pseudo-groups (like <groupname>.requested) that contained only fully
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43 downloaded articles in overview mode (very nice and clever
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44 idea sent in by a user, it would make using overview mode much easier).
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45 Second advantage: Noffle would work with servers that have retrieving
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46 articles by message-id disabled.
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47
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48 * Expire should clean up empty request/outgoing directories, so they will not
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49 exists forever after a server change.
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50
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51 * Do not log program abortion due to SIGINT, if no inconsistency can occur,
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52 (e.g. when calling 'noffle -d' to a pipe and next program terminates or
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53 pressing ^C).
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54
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55 * Improve www page and documentation.
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56
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57 * Keeping the content list for several lock/unlock times could lead to
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58 inconsistent results, because content list is maybe modified by
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59 pseudo articles. Check this!
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61 * Optimize NEWGROUPS (extra list?)
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62
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63 * Add noffle query option for checking all groups, if they are still
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64 available at the remote server(s) and delete them otherwise.
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65
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66 * In online mode, retrieve full article header from remote server if client
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67 sends a HEAD command. Presently, only the header lines from the overview
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68 are returned and the article is only retrieved on an ARTICLE or BODY command.
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69 The reason for this was that some readers (like pine) retrieve the group
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70 overview by sending lots of HEAD commands and their performance would badly
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71 suffer. On the other hand, some readers (like slrn) cache the header from
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72 a HEAD command, even if a following ARTICLE command gets more header lines,
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73 so that not all header lines are available when reading news in online mode,
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74 before the next start of the reader. But some header lines (e.g. Reply-To)
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75 are important.
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76 Maybe make the behaviour configurable.
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79 User-Wishlist
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80 -------------
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81
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82 * Group requesting: I'd like noffle mantain a whitelist of users who can
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83 request new subscriptions: for instance, if user mardy wants noffle to
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84 fetch headers of it.comp.os.linux, he could just post a message to
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85 noffle.control with something like this in the body:
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86 subscribe-over: it.comp.os.linux
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89 Some day far away
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90 -----------------
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91
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92 * Understand supersedes header (useful for reading news.answers group)
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93
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94 * Get and execute cancel messages (read control.cancel, but use xpat to get
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95 only cancels for groups in fetchlist). Seems to be expensive (20000 headers
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96 a day, takes the remote server to search through)
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