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znc: add advanced playback module 

The advanced playback module makes it possible for IRC clients to avoid
undesired repetitive buffer playback. IRC clients may request the module
to send a partial buffer playback starting from and ending to a certain
point of time.

Particularly useful with (supporting) mobile clients such as Mutter,
Colloquy & others.

Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>

---

Unfortunately playback.cpp is not included as part of the standard ZNC
modules and so has been added as a patch.
lilik-openwrt-22.03
Kevin Darbyshire-Bryant 8 years ago
parent
325c2ebbf8
commit
8de1538419
2 changed files with 296 additions and 0 deletions
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  1. +3
    -0
      net/znc/Makefile
  2. +293
    -0
      net/znc/patches/110-add-playback-module.patch

+ 3
- 0
net/znc/Makefile View File

@ -236,6 +236,9 @@ $(eval $(call module,partyline,Allows ZNC users to join internal channels and \
$(eval $(call module,perform,Performs commands on connect.)) $(eval $(call module,perform,Performs commands on connect.))
$(eval $(call module,playback,Avoid repetitive playback buffers on re-connect \
with supported clients (e.g. mutter, colluquy)))
$(eval $(call module,q,Auths you with Q (and a little more).)) $(eval $(call module,q,Auths you with Q (and a little more).))
$(eval $(call module,raw,View all of the raw traffic.)) $(eval $(call module,raw,View all of the raw traffic.))


+ 293
- 0
net/znc/patches/110-add-playback-module.patch View File

@ -0,0 +1,293 @@
Index: znc-1.6.3/modules/playback.cpp
===================================================================
--- /dev/null
+++ znc-1.6.3/modules/playback.cpp
@@ -0,0 +1,288 @@
+/*
+ * Copyright (C) 2015 J-P Nurmi
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <znc/Modules.h>
+#include <znc/IRCNetwork.h>
+#include <znc/Client.h>
+#include <znc/Buffer.h>
+#include <znc/Utils.h>
+#include <znc/Query.h>
+#include <znc/Chan.h>
+#include <znc/znc.h>
+#include <znc/version.h>
+#include <sys/time.h>
+#include <cfloat>
+
+#if (VERSION_MAJOR < 1) || (VERSION_MAJOR == 1 && VERSION_MINOR < 6)
+#error The playback module requires ZNC version 1.6.0 or later.
+#endif
+
+static const char* PlaybackCap = "znc.in/playback";
+
+class CPlaybackMod : public CModule
+{
+public:
+ MODCONSTRUCTOR(CPlaybackMod)
+ {
+ m_play = false;
+ AddHelpCommand();
+ AddCommand("Clear", static_cast<CModCommand::ModCmdFunc>(&CPlaybackMod::ClearCommand), "<buffer(s)>", "Clears playback for given buffers.");
+ AddCommand("Play", static_cast<CModCommand::ModCmdFunc>(&CPlaybackMod::PlayCommand), "<buffer(s)> [from] [to]", "Sends playback for given buffers.");
+ AddCommand("List", static_cast<CModCommand::ModCmdFunc>(&CPlaybackMod::ListCommand), "[buffer(s)]", "Lists available/matching buffers.");
+ AddCommand("Limit", static_cast<CModCommand::ModCmdFunc>(&CPlaybackMod::LimitCommand), "<client> [limit]", "Get/set the buffer limit (<= 0 to clear) for the given client.");
+ }
+
+ void OnClientCapLs(CClient* client, SCString& caps) override
+ {
+ caps.insert(PlaybackCap);
+ }
+
+ bool IsClientCapSupported(CClient* client, const CString& cap, bool state) override
+ {
+ return cap.Equals(PlaybackCap);
+ }
+
+ EModRet OnChanBufferStarting(CChan& chan, CClient& client) override
+ {
+ if (!m_play && client.IsCapEnabled(PlaybackCap))
+ return HALTCORE;
+ return CONTINUE;
+ }
+
+ EModRet OnChanBufferPlayLine(CChan& chan, CClient& client, CString& line) override
+ {
+ if (!m_play && client.IsCapEnabled(PlaybackCap))
+ return HALTCORE;
+ return CONTINUE;
+ }
+
+ EModRet OnChanBufferEnding(CChan& chan, CClient& client) override
+ {
+ if (!m_play && client.IsCapEnabled(PlaybackCap))
+ return HALTCORE;
+ return CONTINUE;
+ }
+
+ EModRet OnPrivBufferPlayLine(CClient& client, CString& line) override
+ {
+ if (!m_play && client.IsCapEnabled(PlaybackCap))
+ return HALTCORE;
+ return CONTINUE;
+ }
+
+ void ClearCommand(const CString& line)
+ {
+ // CLEAR <buffer(s)>
+ const CString arg = line.Token(1);
+ if (arg.empty() || !line.Token(2).empty())
+ return;
+ std::vector<CChan*> chans = FindChans(arg);
+ for (CChan* chan : chans)
+ chan->ClearBuffer();
+ std::vector<CQuery*> queries = FindQueries(arg);
+ for (CQuery* query : queries)
+ query->ClearBuffer();
+ }
+
+ void PlayCommand(const CString& line)
+ {
+ // PLAY <buffer(s)> [from] [to]
+ const CString arg = line.Token(1);
+ if (arg.empty() || !line.Token(4).empty())
+ return;
+ double from = line.Token(2).ToDouble();
+ double to = DBL_MAX;
+ if (!line.Token(3).empty())
+ to = line.Token(3).ToDouble();
+ int limit = -1;
+ if (CClient* client = GetClient())
+ limit = GetLimit(client->GetIdentifier());
+ std::vector<CChan*> chans = FindChans(arg);
+ for (CChan* chan : chans) {
+ if (chan->IsOn() && !chan->IsDetached()) {
+ CBuffer lines = GetLines(chan->GetBuffer(), from, to, limit);
+ m_play = true;
+ chan->SendBuffer(GetClient(), lines);
+ m_play = false;
+ }
+ }
+ std::vector<CQuery*> queries = FindQueries(arg);
+ for (CQuery* query : queries) {
+ CBuffer lines = GetLines(query->GetBuffer(), from, to, limit);
+ m_play = true;
+ query->SendBuffer(GetClient(), lines);
+ m_play = false;
+ }
+ }
+
+ void ListCommand(const CString& line)
+ {
+ // LIST [buffer(s)]
+ CString arg = line.Token(1);
+ if (arg.empty())
+ arg = "*";
+ std::vector<CChan*> chans = FindChans(arg);
+ for (CChan* chan : chans) {
+ if (chan->IsOn() && !chan->IsDetached()) {
+ CBuffer buffer = chan->GetBuffer();
+ if (!buffer.IsEmpty()) {
+ timeval from = UniversalTime(buffer.GetBufLine(0).GetTime());
+ timeval to = UniversalTime(buffer.GetBufLine(buffer.Size() - 1).GetTime());
+ PutModule(chan->GetName() + " " + CString(Timestamp(from)) + " " + CString(Timestamp(to)));
+ }
+ }
+ }
+ std::vector<CQuery*> queries = FindQueries(arg);
+ for (CQuery* query : queries) {
+ CBuffer buffer = query->GetBuffer();
+ if (!buffer.IsEmpty()) {
+ timeval from = UniversalTime(buffer.GetBufLine(0).GetTime());
+ timeval to = UniversalTime(buffer.GetBufLine(buffer.Size() - 1).GetTime());
+ PutModule(query->GetName() + " " + CString(Timestamp(from)) + " " + CString(Timestamp(to)));
+ }
+ }
+ }
+
+ void LimitCommand(const CString& line)
+ {
+ // LIMIT <client> [limit]
+ const CString client = line.Token(1);
+ if (client.empty()) {
+ PutModule("Usage: LIMIT <client> [limit]");
+ return;
+ }
+ const CString arg = line.Token(2);
+ int limit = GetLimit(client);
+ if (!arg.empty()) {
+ limit = arg.ToInt();
+ SetLimit(client, limit);
+ }
+ if (limit <= 0)
+ PutModule(client + " buffer limit: -");
+ else
+ PutModule(client + " buffer limit: " + CString(limit));
+ }
+
+ EModRet OnSendToClient(CString& line, CClient& client) override
+ {
+ if (client.IsAttached() && client.IsCapEnabled(PlaybackCap) && !line.Token(0).Equals("CAP")) {
+ MCString tags = CUtils::GetMessageTags(line);
+ if (tags.find("time") == tags.end()) {
+ // CUtils::FormatServerTime() converts to UTC
+ tags["time"] = CUtils::FormatServerTime(LocalTime());
+ CUtils::SetMessageTags(line, tags);
+ }
+ }
+ return CONTINUE;
+ }
+
+private:
+ static double Timestamp(timeval tv)
+ {
+ return tv.tv_sec + tv.tv_usec / 1000000.0;
+ }
+
+ static timeval LocalTime()
+ {
+ timeval tv;
+ if (gettimeofday(&tv, NULL) == -1) {
+ tv.tv_sec = time(NULL);
+ tv.tv_usec = 0;
+ }
+ return tv;
+ }
+
+ static timeval UniversalTime(timeval tv = LocalTime())
+ {
+ tm stm;
+ memset(&stm, 0, sizeof(stm));
+ const time_t secs = tv.tv_sec; // OpenBSD has tv_sec as int, so explicitly convert it to time_t to make gmtime_r() happy
+ gmtime_r(&secs, &stm);
+ const char* tz = getenv("TZ");
+ setenv("TZ", "UTC", 1);
+ tzset();
+ tv.tv_sec = mktime(&stm);
+ if (tz)
+ setenv("TZ", tz, 1);
+ else
+ unsetenv("TZ");
+ tzset();
+ return tv;
+ }
+
+ std::vector<CChan*> FindChans(const CString& arg) const
+ {
+ std::vector<CChan*> chans;
+ CIRCNetwork* network = GetNetwork();
+ if (network) {
+ VCString vargs;
+ arg.Split(",", vargs, false);
+
+ for (const CString& name : vargs) {
+ std::vector<CChan*> found = network->FindChans(name);
+ chans.insert(chans.end(), found.begin(), found.end());
+ }
+ }
+ return chans;
+ }
+
+ std::vector<CQuery*> FindQueries(const CString& arg) const
+ {
+ std::vector<CQuery*> queries;
+ CIRCNetwork* network = GetNetwork();
+ if (network) {
+ VCString vargs;
+ arg.Split(",", vargs, false);
+
+ for (const CString& name : vargs) {
+ std::vector<CQuery*> found = network->FindQueries(name);
+ queries.insert(queries.end(), found.begin(), found.end());
+ }
+ }
+ return queries;
+ }
+
+ int GetLimit(const CString& client) const
+ {
+ return GetNV(client).ToInt();
+ }
+
+ void SetLimit(const CString& client, int limit)
+ {
+ if (limit > 0)
+ SetNV(client, CString(limit));
+ else
+ DelNV(client);
+ }
+
+ static CBuffer GetLines(const CBuffer& buffer, double from, double to, int limit)
+ {
+ CBuffer lines(buffer.Size());
+ for (size_t i = 0; i < buffer.Size(); ++i) {
+ const CBufLine& line = buffer.GetBufLine(i);
+ timeval tv = UniversalTime(line.GetTime());
+ if (from < Timestamp(tv) && to >= Timestamp(tv))
+ lines.AddLine(line.GetFormat(), line.GetText(), &tv);
+ }
+ if (limit > 0)
+ lines.SetLineCount(limit);
+ return lines;
+ }
+
+ bool m_play;
+};
+
+GLOBALMODULEDEFS(CPlaybackMod, "An advanced playback module for ZNC")

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