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annotate mod_statistics/top.lib.lua @ 5668:ecfd7aece33b

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mod_measure_modules: Report module statuses via OpenMetrics Someone in the chat asked about a health check endpoint, which reminded me of mod_http_status, which provides access to module statuses with full details. After that, this idea came about, which seems natural. As noted in the README, it could be used to monitor that critical modules are in fact loaded correctly. As more modules use the status API, the more useful this module and mod_http_status becomes.
author Kim Alvefur <zash@zash.se>
date Fri, 06 Oct 2023 18:34:39 +0200
parents 66bda434d476
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local array = require "util.array";
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2 local it = require "util.iterators";
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3 local curses = require "curses";
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4 local stats = module:require "stats".stats;
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5 local time = require "socket".gettime;
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6
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7 local sessions_idle_after = 60;
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8 local stanza_names = {"message", "presence", "iq"};
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9
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10 local top = {};
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11 top.__index = top;
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12
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13 local status_lines = {
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14 "Prosody $version - $time up $up_since, $total_users users, $cpu busy";
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15 "Connections: $total_c2s c2s, $total_s2sout s2sout, $total_s2sin s2sin, $total_component component";
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6c555e7dc942 mod_statistics/top.lua: Adjust displayed memory stats for previous commit (3e2c4f424797)
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16 "Memory: $memory_lua lua, $memory_allocated process ($memory_used in use)";
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17 "Stanzas in: $message_in_per_second message/s, $presence_in_per_second presence/s, $iq_in_per_second iq/s";
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18 "Stanzas out: $message_out_per_second message/s, $presence_out_per_second presence/s, $iq_out_per_second iq/s";
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19 };
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20
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21 function top:draw()
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22 self:draw_status();
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23 self:draw_column_titles();
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24 self:draw_conn_list();
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25 self.statuswin:refresh();
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26 self.listwin:refresh();
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27 --self.infowin:refresh()
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28 self.stdscr:move(#status_lines,0)
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29 end
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30
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31 -- Width specified as cols or % of unused space, defaults to
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32 -- title width if not specified
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33 local conn_list_columns = {
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34 { title = "ID", key = "id", width = "8" };
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35 { title = "JID", key = "jid", width = "100%" };
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36 { title = "STANZAS IN>", key = "total_stanzas_in", align = "right" };
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37 { title = "MSG", key = "message_in", align = "right", width = "4" };
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38 { title = "PRES", key = "presence_in", align = "right", width = "4" };
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39 { title = "IQ", key = "iq_in", align = "right", width = "4" };
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40 { title = "STANZAS OUT>", key = "total_stanzas_out", align = "right" };
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41 { title = "MSG", key = "message_out", align = "right", width = "4" };
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42 { title = "PRES", key = "presence_out", align = "right", width = "4" };
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43 { title = "IQ", key = "iq_out", align = "right", width = "4" };
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44 { title = "BYTES IN", key = "bytes_in", align = "right" };
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45 { title = "BYTES OUT", key = "bytes_out", align = "right" };
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46
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47 };
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48
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49 function top:draw_status()
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50 for row, line in ipairs(status_lines) do
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51 self.statuswin:mvaddstr(row-1, 0, (line:gsub("%$([%w_]+)", self.data)));
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52 self.statuswin:clrtoeol();
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53 end
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54 -- Clear stanza counts
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55 for _, stanza_type in ipairs(stanza_names) do
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56 self.prosody[stanza_type.."_in_per_second"] = 0;
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57 self.prosody[stanza_type.."_out_per_second"] = 0;
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58 end
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59 end
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60
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61 local function padright(s, width)
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62 return s..string.rep(" ", width-#s);
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63 end
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64
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65 local function padleft(s, width)
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66 return string.rep(" ", width-#s)..s;
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67 end
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68
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69 function top:resized()
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70 self:recalc_column_widths();
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71 --self.stdscr:clear();
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72 self:draw();
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73 end
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74
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75 function top:recalc_column_widths()
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76 local widths = {};
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77 self.column_widths = widths;
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78 local total_width = curses.cols()-4;
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79 local free_width = total_width;
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80 for i = 1, #conn_list_columns do
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81 local width = conn_list_columns[i].width or "0";
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82 if not(type(width) == "string" and width:sub(-1) == "%") then
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83 width = math.max(tonumber(width), #conn_list_columns[i].title+1);
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84 widths[i] = width;
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85 free_width = free_width - width;
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86 end
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87 end
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88 for i = 1, #conn_list_columns do
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89 if not widths[i] then
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90 local pc_width = tonumber((conn_list_columns[i].width:gsub("%%$", "")));
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91 widths[i] = math.floor(free_width*(pc_width/100));
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92 end
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93 end
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94 return widths;
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95 end
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96
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97 function top:draw_column_titles()
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98 local widths = self.column_widths;
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99 self.listwin:attron(curses.A_REVERSE);
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100 self.listwin:mvaddstr(0, 0, " ");
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101 for i, column in ipairs(conn_list_columns) do
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102 self.listwin:addstr(padright(column.title, widths[i]));
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103 end
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104 self.listwin:addstr(" ");
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105 self.listwin:attroff(curses.A_REVERSE);
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106 end
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107
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108 local function session_compare(session1, session2)
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109 local stats1, stats2 = session1.stats, session2.stats;
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110 return (stats1.total_stanzas_in + stats1.total_stanzas_out) >
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111 (stats2.total_stanzas_in + stats2.total_stanzas_out);
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112 end
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113
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114 function top:draw_conn_list()
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115 local rows = curses.lines()-(#status_lines+2)-5;
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116 local cutoff_time = time() - sessions_idle_after;
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117 local widths = self.column_widths;
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118 local top_sessions = array.collect(it.values(self.active_sessions)):sort(session_compare);
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119 for index = 1, rows do
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120 local session = top_sessions[index];
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121 if session then
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122 if session.last_update < cutoff_time then
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123 self.active_sessions[session.id] = nil;
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124 else
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125 local row = {};
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126 for i, column in ipairs(conn_list_columns) do
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127 local width = widths[i];
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128 local v = tostring(session[column.key] or ""):sub(1, width);
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129 if #v < width then
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130 if column.align == "right" then
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131 v = padleft(v, width-1).." ";
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132 else
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133 v = padright(v, width);
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134 end
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135 end
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136 table.insert(row, v);
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137 end
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138 if session.updated then
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139 self.listwin:attron(curses.A_BOLD);
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140 end
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141 self.listwin:mvaddstr(index, 0, " "..table.concat(row));
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142 if session.updated then
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143 session.updated = false;
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144 self.listwin:attroff(curses.A_BOLD);
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145 end
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146 end
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147 else
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148 -- FIXME: How to clear a line? It's 5am and I don't feel like reading docs.
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149 self.listwin:move(index, 0);
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150 self.listwin:clrtoeol();
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151 end
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152 end
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153 end
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154
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155 function top:update_stat(name, value)
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156 self.prosody[name] = value;
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157 end
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diff changeset
158
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159 function top:update_session(id, jid, stats)
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160 self.active_sessions[id] = stats;
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diff changeset
161 stats.id, stats.jid, stats.stats = id, jid, stats;
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diff changeset
162 stats.total_bytes = stats.bytes_in + stats.bytes_out;
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parents:
diff changeset
163 for _, stanza_type in ipairs(stanza_names) do
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164 self.prosody[stanza_type.."_in_per_second"] = (self.prosody[stanza_type.."_in_per_second"] or 0) + stats[stanza_type.."_in"];
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diff changeset
165 self.prosody[stanza_type.."_out_per_second"] = (self.prosody[stanza_type.."_out_per_second"] or 0) + stats[stanza_type.."_out"];
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parents:
diff changeset
166 end
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diff changeset
167 stats.total_stanzas_in = stats.message_in + stats.presence_in + stats.iq_in;
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diff changeset
168 stats.total_stanzas_out = stats.message_out + stats.presence_out + stats.iq_out;
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diff changeset
169 stats.last_update = time();
1083
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170 stats.updated = true;
1072
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parents:
diff changeset
171 end
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diff changeset
172
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diff changeset
173 local function new(base)
1072
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parents:
diff changeset
174 setmetatable(base, top);
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diff changeset
175 base.data = setmetatable({}, {
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176 __index = function (t, k)
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diff changeset
177 local stat = stats[k];
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178 if stat and stat.tostring then
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diff changeset
179 if type(stat.tostring) == "function" then
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diff changeset
180 return stat.tostring(base.prosody[k]);
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parents:
diff changeset
181 elseif type(stat.tostring) == "string" then
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diff changeset
182 local v = base.prosody[k];
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diff changeset
183 if v == nil then
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diff changeset
184 return "?";
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parents:
diff changeset
185 end
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diff changeset
186 return (stat.tostring):format(v);
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diff changeset
187 end
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parents:
diff changeset
188 end
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parents:
diff changeset
189 return base.prosody[k];
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parents:
diff changeset
190 end;
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parents:
diff changeset
191 });
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parents:
diff changeset
192
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diff changeset
193 base.active_sessions = {};
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parents:
diff changeset
194
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diff changeset
195 base.statuswin = curses.newwin(#status_lines, 0, 0, 0);
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parents:
diff changeset
196
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diff changeset
197 base.promptwin = curses.newwin(1, 0, #status_lines, 0);
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parents:
diff changeset
198 base.promptwin:addstr("");
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parents:
diff changeset
199 base.promptwin:refresh();
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parents:
diff changeset
200
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parents:
diff changeset
201 base.listwin = curses.newwin(curses.lines()-(#status_lines+2)-5, 0, #status_lines+1, 0);
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parents:
diff changeset
202 base.listwin:syncok();
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diff changeset
203
1072
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diff changeset
204 base.infowin = curses.newwin(5, 0, curses.lines()-5, 0);
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parents:
diff changeset
205 base.infowin:mvaddstr(1, 1, "Hello world");
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parents:
diff changeset
206 base.infowin:border(0,0,0,0);
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parents:
diff changeset
207 base.infowin:syncok();
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parents:
diff changeset
208 base.infowin:refresh();
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parents:
diff changeset
209
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parents:
diff changeset
210 base:resized();
1343
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Florian Zeitz <florob@babelmonkeys.de>
parents: 1084
diff changeset
211
1072
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parents:
diff changeset
212 return base;
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parents:
diff changeset
213 end
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parents:
diff changeset
214
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parents: 1343
diff changeset
215 return { new = new };