1 (* 'top'-like tool for libvirt domains.
2 (C) Copyright 2007 Richard W.M. Jones, Red Hat Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 This file contains utility functions.
24 module C = Libvirt.Connect
25 module D = Libvirt.Domain
26 module N = Libvirt.Network
28 let (//) = Filename.concat
30 (* Int64 operators for convenience. *)
33 let ( *^ ) = Int64.mul
36 (* Input a whole file as a list of lines. *)
37 let input_all_lines chan =
41 lines := input_line chan :: !lines
47 (* Trim whitespace from the beginning and end of strings. *)
50 (* || c = '\f' *) || c = '\n' || c = '\r' || c = '\t' (* || c = '\v' *)
52 let triml ?(test = isspace) str =
54 let n = ref (String.length str) in
55 while !n > 0 && test str.[!i]; do
60 else String.sub str !i !n
62 let trimr ?(test = isspace) str =
63 let n = ref (String.length str) in
64 while !n > 0 && test str.[!n-1]; do
67 if !n = String.length str then str
68 else String.sub str 0 !n
70 let trim ?(test = isspace) str =
73 (* Read a configuration file as a list of (key, value) pairs.
74 * If the config file is missing this returns an empty list.
76 let blanks_and_comments = Str.regexp "^[ \t]*\\(#.*\\)?$"
78 let read_config_file filename =
81 let chan = open_in filename in
82 let lines = input_all_lines chan in
86 Sys_error _ -> [] in (* Ignore errors opening file. *)
90 let i = ref 0 in List.map (fun line -> (incr i; !i), line) lines in
92 (* Remove blank lines and comment lines. *)
95 (fun (lineno, line) ->
96 not (Str.string_match blanks_and_comments line 0)) lines in
98 (* Convert to key, value pairs. *)
100 fun (lineno, line) ->
101 let key, value = ExtString.String.split line " " in
102 lineno, trim key, trim value
105 (* Pad a string to the full width with spaces. If too long, truncate. *)
107 let n = String.length str in
108 if n = width then str
109 else if n > width then String.sub str 0 width
110 else (* if n < width then *) str ^ String.make (width-n) ' '
113 (* Show a percentage in 4 chars. *)
114 let percent percent =
115 if percent <= 0. then " 0.0"
116 else if percent <= 9.9 then sprintf " %1.1f" percent
117 else if percent <= 99.9 then sprintf "%2.1f" percent
120 (* Show an int64 option in 4 chars. *)
121 let rec int64_option = function
124 (* Show an int64 in 4 chars. *)
126 | n when n < 0L -> "-!!!"
127 | n when n <= 9999L ->
129 | n when n /^ 1024L <= 999L ->
130 sprintf "%3LdK" (n /^ 1024L)
131 | n when n /^ 1_048_576L <= 999L ->
132 sprintf "%3LdM" (n /^ 1_048_576L)
133 | n when n /^ 1_073_741_824L <= 999L ->
134 sprintf "%3LdG" (n /^ 1_073_741_824L)
137 (* Format the total time (may be large!) in 9 chars. *)
139 let secs_in_ns = 1_000_000_000L in
140 let mins_in_ns = 60_000_000_000L in
141 let hours_in_ns = 3_600_000_000_000L in
143 let hours = ns /^ hours_in_ns in
144 let ns = ns -^ (hours *^ hours_in_ns) in
145 let mins = ns /^ mins_in_ns in
146 let ns = ns -^ (mins *^ mins_in_ns) in
147 let secs = ns /^ secs_in_ns in
148 let ns = ns -^ (secs *^ secs_in_ns) in
149 let pennies = ns /^ 10_000_000L in
152 sprintf "%3Ld:%02Ld.%02Ld" (hours *^ 60L +^ mins) secs pennies
153 else if hours <= 999L then
154 sprintf "%3Ld:%02Ld:%02Ld" hours mins secs
156 let days = hours /^ 24L in
157 let hours = hours -^ (days *^ 24L) in
158 sprintf "%3Ldd%02Ld:%02Ld" days hours mins
162 (* Sum Domain.block_stats structures together. Missing fields
163 * get forced to 0. Empty list returns all 0.
165 let zero_block_stats =
166 { D.rd_req = 0L; rd_bytes = 0L; wr_req = 0L; wr_bytes = 0L; errs = 0L }
167 let add_block_stats bs1 bs2 =
168 let add f1 f2 = if f1 >= 0L && f2 >= 0L then f1 +^ f2 else 0L in
169 { D.rd_req = add bs1.D.rd_req bs2.D.rd_req;
170 rd_bytes = add bs1.D.rd_bytes bs2.D.rd_bytes;
171 wr_req = add bs1.D.wr_req bs2.D.wr_req;
172 wr_bytes = add bs1.D.wr_bytes bs2.D.wr_bytes;
173 errs = add bs1.D.errs bs2.D.errs }
174 let sum_block_stats =
175 List.fold_left add_block_stats zero_block_stats
177 (* Get the difference between two block_stats structures. Missing data
178 * forces the difference to -1.
180 let diff_block_stats curr prev =
181 let sub f1 f2 = if f1 >= 0L && f2 >= 0L then f1 -^ f2 else -1L in
182 { D.rd_req = sub curr.D.rd_req prev.D.rd_req;
183 rd_bytes = sub curr.D.rd_bytes prev.D.rd_bytes;
184 wr_req = sub curr.D.wr_req prev.D.wr_req;
185 wr_bytes = sub curr.D.wr_bytes prev.D.wr_bytes;
186 errs = sub curr.D.errs prev.D.errs }
188 (* Sum Domain.interface_stats structures together. Missing fields
189 * get forced to 0. Empty list returns all 0.
191 let zero_interface_stats =
192 { D.rx_bytes = 0L; rx_packets = 0L; rx_errs = 0L; rx_drop = 0L;
193 tx_bytes = 0L; tx_packets = 0L; tx_errs = 0L; tx_drop = 0L }
194 let add_interface_stats is1 is2 =
195 let add f1 f2 = if f1 >= 0L && f2 >= 0L then f1 +^ f2 else 0L in
196 { D.rx_bytes = add is1.D.rx_bytes is2.D.rx_bytes;
197 rx_packets = add is1.D.rx_packets is2.D.rx_packets;
198 rx_errs = add is1.D.rx_errs is2.D.rx_errs;
199 rx_drop = add is1.D.rx_drop is2.D.rx_drop;
200 tx_bytes = add is1.D.tx_bytes is2.D.tx_bytes;
201 tx_packets = add is1.D.tx_packets is2.D.tx_packets;
202 tx_errs = add is1.D.tx_errs is2.D.tx_errs;
203 tx_drop = add is1.D.tx_drop is2.D.tx_drop }
204 let sum_interface_stats =
205 List.fold_left add_interface_stats zero_interface_stats
207 (* Get the difference between two interface_stats structures.
208 * Missing data forces the difference to -1.
210 let diff_interface_stats curr prev =
211 let sub f1 f2 = if f1 >= 0L && f2 >= 0L then f1 -^ f2 else -1L in
212 { D.rx_bytes = sub curr.D.rx_bytes prev.D.rx_bytes;
213 rx_packets = sub curr.D.rx_packets prev.D.rx_packets;
214 rx_errs = sub curr.D.rx_errs prev.D.rx_errs;
215 rx_drop = sub curr.D.rx_drop prev.D.rx_drop;
216 tx_bytes = sub curr.D.tx_bytes prev.D.tx_bytes;
217 tx_packets = sub curr.D.tx_packets prev.D.tx_packets;
218 tx_errs = sub curr.D.tx_errs prev.D.tx_errs;
219 tx_drop = sub curr.D.tx_drop prev.D.tx_drop }