Module: Open3
- Defined in:
- lib/open3_backport/open3.rb,
lib/open3_backport/original_open3.rb
Overview
Open3 grants you access to stdin, stdout, stderr and a thread to wait the child process when running another program. You can specify various attributes, redirections, current directory, etc., of the program as Process.spawn.
-
Open3.popen3 : pipes for stdin, stdout, stderr
-
Open3.popen2 : pipes for stdin, stdout
-
Open3.popen2e : pipes for stdin, merged stdout and stderr
-
Open3.capture3 : give a string for stdin. get strings for stdout, stderr
-
Open3.capture2 : give a string for stdin. get a string for stdout
-
Open3.capture2e : give a string for stdin. get a string for merged stdout and stderr
-
Open3.pipeline_rw : pipes for first stdin and last stdout of a pipeline
-
Open3.pipeline_r : pipe for last stdout of a pipeline
-
Open3.pipeline_w : pipe for first stdin of a pipeline
-
Open3.pipeline_start : a pipeline
-
Open3.pipeline : run a pipline and wait
Constant Summary collapse
- CAPTURE_BUFFER_SIZE =
65536
Class Method Summary collapse
-
.capture2(*cmd, &block) ⇒ Object
Open3.capture2 captures the standard output of a command.
-
.capture2e(*cmd, &block) ⇒ Object
Open3.capture2e captures the standard output and the standard error of a command.
-
.capture3(*cmd, &block) ⇒ Object
Open3.capture3 captures the standard output and the standard error of a command.
-
.detach(pid) ⇒ Object
:nodoc:.
-
.pipeline(*cmds) ⇒ Object
Open3.pipeline starts a list of commands as a pipeline.
-
.pipeline_r(*cmds, &block) ⇒ Object
Open3.pipeline_r starts a list of commands as a pipeline with a pipe which connects stdout of the last command.
-
.pipeline_run(cmds, pipeline_opts, child_io, parent_io, &block) ⇒ Object
:nodoc:.
-
.pipeline_rw(*cmds, &block) ⇒ Object
Open3.pipeline_rw starts a list of commands as a pipeline with pipes which connects stdin of the first command and stdout of the last command.
-
.pipeline_start(*cmds, &block) ⇒ Object
Open3.pipeline_start starts a list of commands as a pipeline.
-
.pipeline_w(*cmds, &block) ⇒ Object
Open3.pipeline_w starts a list of commands as a pipeline with a pipe which connects stdin of the first command.
-
.popen2(*cmd, &block) ⇒ Object
Open3.popen2 is similer to Open3.popen3 except it doesn’t make a pipe for the standard error stream.
-
.popen2e(*cmd, &block) ⇒ Object
Open3.popen2e is similer to Open3.popen3 except it merges the standard output stream and the standard error stream.
-
.popen3(*cmd, &block) ⇒ Object
Open stdin, stdout, and stderr streams and start external executable.
-
.popen_run(cmd, opts, child_io, parent_io) ⇒ Object
:nodoc:.
Instance Method Summary collapse
Class Method Details
.capture2(*cmd, &block) ⇒ Object
Open3.capture2 captures the standard output of a command.
stdout_str, status = Open3.capture2([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts and opts. See Process.spawn.
If opts is specified, it is sent to the command’s standard input.
If opts is true, internal pipes are set to binary mode.
Example:
# factor is a command for integer factorization.
o, s = Open3.capture2("factor", :stdin_data=>"42")
p o #=> "42: 2 3 7\n"
# generate x**2 graph in png using gnuplot.
gnuplot_commands = <<"End"
set terminal png
plot x**2, "-" with lines
1 14
2 1
3 8
4 5
e
End
image, s = Open3.capture2("gnuplot", :stdin_data=>gnuplot_commands, :binmode=>true)
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# File 'lib/open3_backport/open3.rb', line 335 def capture2(*cmd) if Hash === cmd.last opts = cmd.pop.dup else opts = {} end binmode = opts[:binmode] i_data = (opts[:stdin_data] || '').to_s o_data = '' popen3(*cmd) do |i, o, e, t| e.close if binmode i.binmode o.binmode e.binmode end i_complete = i_data.empty? o_complete = false until i_complete && o_complete i_blocked = false o_blocked = false unless i_complete begin bytes_written = i.write_nonblock(i_data) if bytes_written == i_data.length i.close i_complete = true else i_data = i_data[bytes_written .. -1] end rescue Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::EINTR i_blocked = true end end unless o_complete begin o_data << o.read_nonblock(CAPTURE_BUFFER_SIZE) rescue Errno::EWOULDBLOCK, Errno::EAGAIN o_blocked = true rescue EOFError raise unless i_complete o.close o_complete = true end end if i_blocked && o_blocked && e_blocked IO.select([o], [i], [o,i]) end end return [o_data, t.value] end end |
.capture2e(*cmd, &block) ⇒ Object
Open3.capture2e captures the standard output and the standard error of a command.
stdout_and_stderr_str, status = Open3.capture2e([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts and opts. See Process.spawn.
If opts is specified, it is sent to the command’s standard input.
If opts is true, internal pipes are set to binary mode.
Example:
# capture make log
make_log, s = Open3.capture2e("make")
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# File 'lib/open3_backport/open3.rb', line 411 def capture2e(*cmd) if Hash === cmd.last opts = cmd.pop.dup else opts = {} end binmode = opts[:binmode] i_data = (opts[:stdin_data] || '').to_s oe_data = '' popen3(*cmd) do |i, o, e, t| if binmode i.binmode o.binmode e.binmode end i_complete = i_data.empty? o_complete = false e_complete = false until i_complete && o_complete && e_complete i_blocked = false o_blocked = false e_blocked = false unless i_complete begin bytes_written = i.write_nonblock(i_data) if bytes_written == i_data.length i.close i_complete = true else i_data = i_data[bytes_written .. -1] end rescue Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::EINTR i_blocked = true end end unless o_complete begin oe_data << o.read_nonblock(CAPTURE_BUFFER_SIZE) rescue Errno::EWOULDBLOCK, Errno::EAGAIN o_blocked = true rescue EOFError raise unless i_complete o.close o_complete = true end end unless e_complete begin oe_data << e.read_nonblock(CAPTURE_BUFFER_SIZE) rescue Errno::EWOULDBLOCK, Errno::EAGAIN e_blocked = true rescue EOFError raise unless i_complete e.close e_complete = true end end if i_blocked && o_blocked && e_blocked IO.select([o, e], [i], [o,e,i]) end end return [oe_data, t.value] end end |
.capture3(*cmd, &block) ⇒ Object
Open3.capture3 captures the standard output and the standard error of a command.
stdout_str, stderr_str, status = Open3.capture3([env,] cmd... [, opts])
The arguments env, cmd and opts are passed to Open3.popen3 except opts and opts. See Process.spawn.
If opts is specified, it is sent to the command’s standard input.
If opts is true, internal pipes are set to binary mode.
Example:
# dot is a command of graphviz.
graph = <<'End'
digraph g {
a -> b
}
End
layouted_graph, dot_log = Open3.capture3("dot -v", :stdin_data=>graph)
o, e, s = Open3.capture3("echo a; sort >&2", :stdin_data=>"foo\nbar\nbaz\n")
p o #=> "a\n"
p e #=> "bar\nbaz\nfoo\n"
p s #=> #<Process::Status: pid 32682 exit 0>
# generate a thumnail image using the convert command of ImageMagick.
# However, if the image stored really in a file,
# system("convert", "-thumbnail", "80", "png:#{filename}", "png:-") is better
# because memory consumption.
# But if the image is stored in a DB or generated by gnuplot Open3.capture2 example,
# Open3.capture3 is considerable.
#
image = File.read("/usr/share/openclipart/png/animals/mammals/sheep-md-v0.1.png", :binmode=>true)
thumnail, err, s = Open3.capture3("convert -thumbnail 80 png:- png:-", :stdin_data=>image, :binmode=>true)
if s.success?
STDOUT.binmode; print thumnail
end
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# File 'lib/open3_backport/open3.rb', line 232 def capture3(*cmd) if Hash === cmd.last opts = cmd.pop.dup else opts = {} end binmode = opts[:binmode] i_data = (opts[:stdin_data] || '').to_s o_data = '' e_data = '' popen3(*cmd) do |i, o, e, t| if binmode i.binmode o.binmode e.binmode end i_complete = i_data.empty? o_complete = false e_complete = false until i_complete && o_complete && e_complete i_blocked = false o_blocked = false e_blocked = false unless i_complete begin bytes_written = i.write_nonblock(i_data) if bytes_written == i_data.length i.close i_complete = true else i_data = i_data[bytes_written .. -1] end rescue Errno::EWOULDBLOCK, Errno::EAGAIN, Errno::EINTR i_blocked = true end end unless o_complete begin o_data << o.read_nonblock(CAPTURE_BUFFER_SIZE) rescue Errno::EWOULDBLOCK, Errno::EAGAIN o_blocked = true rescue EOFError raise unless i_complete o.close o_complete = true end end unless e_complete begin e_data << e.read_nonblock(CAPTURE_BUFFER_SIZE) rescue Errno::EWOULDBLOCK, Errno::EAGAIN e_blocked = true rescue EOFError raise unless i_complete e.close e_complete = true end end if i_blocked && o_blocked && e_blocked IO.select([o, e], [i], [o,e,i]) end end return [o_data, e_data, t.value] end end |
.detach(pid) ⇒ Object
:nodoc:
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# File 'lib/open3_backport/open3.rb', line 30 def detach(pid) # :nodoc: thread = Process.detach(pid) thread[:pid] = pid def thread.pid self[:pid] end thread end |
.pipeline(*cmds) ⇒ Object
Open3.pipeline starts a list of commands as a pipeline. It waits the finish of the commands. No pipe made for stdin of the first command and stdout of the last command.
status_list = Open3.pipeline(cmd1, cmd2, ... [, opts])
Each cmd is a string or an array. If it is an array, the elements are passed to Process.spawn.
cmd:
commandline command line string which is passed to a shell
[env, commandline, opts] command line string which is passed to a shell
[env, cmdname, arg1, ..., opts] command name and one or more arguments (no shell)
[env, [cmdname, argv0], arg1, ..., opts] command name and arguments including argv[0] (no shell)
Note that env and opts are optional, as Process.spawn.
Example:
fname = "/usr/share/man/man1/ruby.1.gz"
p Open3.pipeline(["zcat", fname], "nroff -man", "less")
#=> [#<Process::Status: pid 11817 exit 0>,
# #<Process::Status: pid 11820 exit 0>,
# #<Process::Status: pid 11828 exit 0>]
fname = "/usr/share/man/man1/ls.1.gz"
Open3.pipeline(["zcat", fname], "nroff -man", "colcrt")
# convert PDF to PS and send to a printer by lpr
pdf_file = "paper.pdf"
printer = "printer-name"
Open3.pipeline(["pdftops", pdf_file, "-"],
["lpr", "-P#{printer}"])
# count lines
Open3.pipeline("sort", "uniq -c", :in=>"names.txt", :out=>"count")
# cyclic pipeline
r,w = IO.pipe
w.print "ibase=14\n10\n"
Open3.pipeline("bc", "tee /dev/tty", :in=>r, :out=>w)
#=> 14
# 18
# 22
# 30
# 42
# 58
# 78
# 106
# 202
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# File 'lib/open3_backport/open3.rb', line 672 def pipeline(*cmds) raise NotImplementedError end |
.pipeline_r(*cmds, &block) ⇒ Object
Open3.pipeline_r starts a list of commands as a pipeline with a pipe which connects stdout of the last command.
Open3.pipeline_r(cmd1, cmd2, ... [, opts]) {|last_stdout, wait_threads|
...
}
last_stdout, wait_threads = Open3.pipeline_r(cmd1, cmd2, ... [, opts])
...
last_stdout.close
Each cmd is a string or an array. If it is an array, the elements are passed to Process.spawn.
cmd:
commandline command line string which is passed to a shell
[env, commandline, opts] command line string which is passed to a shell
[env, cmdname, arg1, ..., opts] command name and one or more arguments (no shell)
[env, [cmdname, argv0], arg1, ..., opts] command name and arguments including argv[0] (no shell)
Note that env and opts are optional, as Process.spawn.
Example:
Open3.pipeline_r("zcat /var/log/apache2/access.log.*.gz",
[{"LANG"=>"C"}, "grep", "GET /favicon.ico"],
"logresolve") {|o, ts|
o.each_line {|line|
...
}
}
Open3.pipeline_r("yes", "head -10") {|o, ts|
p o.read #=> "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"
p ts[0].value #=> #<Process::Status: pid 24910 SIGPIPE (signal 13)>
p ts[1].value #=> #<Process::Status: pid 24913 exit 0>
}
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# File 'lib/open3_backport/open3.rb', line 554 def pipeline_r(*cmds, &block) raise NotImplementedError end |
.pipeline_run(cmds, pipeline_opts, child_io, parent_io, &block) ⇒ Object
:nodoc:
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# File 'lib/open3_backport/original_open3.rb', line 656 def pipeline_run(cmds, pipeline_opts, child_io, parent_io, &block) # :nodoc: if cmds.empty? raise ArgumentError, "no commands" end opts_base = pipeline_opts.dup opts_base.delete :in opts_base.delete :out wait_thrs = [] r = nil cmds.each_with_index {|cmd, i| cmd_opts = opts_base.dup if String === cmd cmd = [cmd] else cmd_opts.update cmd.pop if Hash === cmd.last end if i == 0 if !cmd_opts.include?(:in) if pipeline_opts.include?(:in) cmd_opts[:in] = pipeline_opts[:in] end end else cmd_opts[:in] = r end if i != cmds.length - 1 r2, w2 = IO.pipe cmd_opts[:out] = w2 else if !cmd_opts.include?(:out) if pipeline_opts.include?(:out) cmd_opts[:out] = pipeline_opts[:out] end end end pid = spawn(*cmd, cmd_opts) wait_thrs << Process.detach(pid) r.close if r w2.close if w2 r = r2 } result = parent_io + [wait_thrs] child_io.each {|io| io.close } if defined? yield begin return yield(*result) ensure parent_io.each{|io| io.close unless io.closed?} wait_thrs.each {|t| t.join } end end result end |
.pipeline_rw(*cmds, &block) ⇒ Object
Open3.pipeline_rw starts a list of commands as a pipeline with pipes which connects stdin of the first command and stdout of the last command.
Open3.pipeline_rw(cmd1, cmd2, ... [, opts]) {|first_stdin, last_stdout, wait_threads|
...
}
first_stdin, last_stdout, wait_threads = Open3.pipeline_rw(cmd1, cmd2, ... [, opts])
...
first_stdin.close
last_stdout.close
Each cmd is a string or an array. If it is an array, the elements are passed to Process.spawn.
cmd:
commandline command line string which is passed to a shell
[env, commandline, opts] command line string which is passed to a shell
[env, cmdname, arg1, ..., opts] command name and one or more arguments (no shell)
[env, [cmdname, argv0], arg1, ..., opts] command name and arguments including argv[0] (no shell)
Note that env and opts are optional, as Process.spawn.
The option to pass Process.spawn is constructed by merging opts
, the last hash element of the array and specification for the pipe between each commands.
Example:
Open3.pipeline_rw("tr -dc A-Za-z", "wc -c") {|i,o,ts|
i.puts "All persons more than a mile high to leave the court."
i.close
p o.gets #=> "42\n"
}
Open3.pipeline_rw("sort", "cat -n") {|stdin, stdout, wait_thrs|
stdin.puts "foo"
stdin.puts "bar"
stdin.puts "baz"
stdin.close # send EOF to sort.
p stdout.read #=> " 1\tbar\n 2\tbaz\n 3\tfoo\n"
}
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# File 'lib/open3_backport/open3.rb', line 518 def pipeline_rw(*cmds, &block) raise NotImplementedError end |
.pipeline_start(*cmds, &block) ⇒ Object
Open3.pipeline_start starts a list of commands as a pipeline. No pipe made for stdin of the first command and stdout of the last command.
Open3.pipeline_start(cmd1, cmd2, ... [, opts]) {|wait_threads|
...
}
wait_threads = Open3.pipeline_start(cmd1, cmd2, ... [, opts])
...
Each cmd is a string or an array. If it is an array, the elements are passed to Process.spawn.
cmd:
commandline command line string which is passed to a shell
[env, commandline, opts] command line string which is passed to a shell
[env, cmdname, arg1, ..., opts] command name and one or more arguments (no shell)
[env, [cmdname, argv0], arg1, ..., opts] command name and arguments including argv[0] (no shell)
Note that env and opts are optional, as Process.spawn.
Example:
# run xeyes in 10 seconds.
Open3.pipeline_start("xeyes") {|ts|
sleep 10
t = ts[0]
Process.kill("TERM", t.pid)
p t.value #=> #<Process::Status: pid 911 SIGTERM (signal 15)>
}
# convert pdf to ps and send it to a printer.
# collect error message of pdftops and lpr.
pdf_file = "paper.pdf"
printer = "printer-name"
err_r, err_w = IO.pipe
Open3.pipeline_start(["pdftops", pdf_file, "-"],
["lpr", "-P#{printer}"],
:err=>err_w) {|ts|
err_w.close
p err_r.read # error messages of pdftops and lpr.
}
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# File 'lib/open3_backport/open3.rb', line 622 def pipeline_start(*cmds, &block) raise NotImplementedError end |
.pipeline_w(*cmds, &block) ⇒ Object
Open3.pipeline_w starts a list of commands as a pipeline with a pipe which connects stdin of the first command.
Open3.pipeline_w(cmd1, cmd2, ... [, opts]) {|first_stdin, wait_threads|
...
}
first_stdin, wait_threads = Open3.pipeline_w(cmd1, cmd2, ... [, opts])
...
first_stdin.close
Each cmd is a string or an array. If it is an array, the elements are passed to Process.spawn.
cmd:
commandline command line string which is passed to a shell
[env, commandline, opts] command line string which is passed to a shell
[env, cmdname, arg1, ..., opts] command name and one or more arguments (no shell)
[env, [cmdname, argv0], arg1, ..., opts] command name and arguments including argv[0] (no shell)
Note that env and opts are optional, as Process.spawn.
Example:
Open3.pipeline_w("bzip2 -c", :out=>"/tmp/hello.bz2") {|i, ts|
i.puts "hello"
}
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# File 'lib/open3_backport/open3.rb', line 580 def pipeline_w(*cmds, &block) raise NotImplementedError end |
.popen2(*cmd, &block) ⇒ Object
Open3.popen2 is similer to Open3.popen3 except it doesn’t make a pipe for the standard error stream.
Block form:
Open3.popen2([env,] cmd... [, opts]) {|stdin, stdout, wait_thr|
pid = wait_thr.pid # pid of the started process.
...
exit_status = wait_thr.value # Process::Status object returned.
}
Non-block form:
stdin, stdout, wait_thr = Open3.popen2([env,] cmd... [, opts])
...
stdin.close # stdin and stdout should be closed explicitly in this form.
stdout.close
See Process.spawn for the optional hash arguments env and opts.
Example:
Open3.popen2("wc -c") {|i,o,t|
i.print "answer to life the universe and everything"
i.close
p o.gets #=> "42\n"
}
Open3.popen2("bc -q") {|i,o,t|
i.puts "obase=13"
i.puts "6 * 9"
p o.gets #=> "42\n"
}
Open3.popen2("dc") {|i,o,t|
i.print "42P"
i.close
p o.read #=> "*"
}
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# File 'lib/open3_backport/open3.rb', line 135 def popen2(*cmd) if block_given? popen3(*cmd) do |i, o, e, t| e.close yield(i, o, t) end else i, o, e, t = popen3(*cmd) e.close return [i, o, t] end end |
.popen2e(*cmd, &block) ⇒ Object
Open3.popen2e is similer to Open3.popen3 except it merges the standard output stream and the standard error stream.
Block form:
Open3.popen2e([env,] cmd... [, opts]) {|stdin, stdout_and_stderr, wait_thr|
pid = wait_thr.pid # pid of the started process.
...
exit_status = wait_thr.value # Process::Status object returned.
}
Non-block form:
stdin, stdout_and_stderr, wait_thr = Open3.popen2e([env,] cmd... [, opts])
...
stdin.close # stdin and stdout_and_stderr should be closed explicitly in this form.
stdout_and_stderr.close
See Process.spawn for the optional hash arguments env and opts.
Example:
# check gcc warnings
source = "foo.c"
Open3.popen2e("gcc", "-Wall", source) {|i,oe,t|
oe.each {|line|
if /warning/ =~ line
...
end
}
}
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# File 'lib/open3_backport/open3.rb', line 178 def popen2e(*cmd) if block_given? popen3(*cmd) do |i, o, e, t| yield(i, merged_read_stream(o, e), t) end else i, o, e, t = popen3(*cmd) return [i, merged_read_stream(o, e), t] end end |
.popen3(*cmd, &block) ⇒ Object
Open stdin, stdout, and stderr streams and start external executable. In addition, a thread for waiting the started process is noticed. The thread has a pid method and thread variable :pid which is the pid of the started process.
Block form:
Open3.popen3([env,] cmd... [, opts]) {|stdin, stdout, stderr, wait_thr|
pid = wait_thr.pid # pid of the started process.
...
exit_status = wait_thr.value # Process::Status object returned.
}
Non-block form:
stdin, stdout, stderr, wait_thr = Open3.popen3([env,] cmd... [, opts])
pid = wait_thr[:pid] # pid of the started process.
...
stdin.close # stdin, stdout and stderr should be closed explicitly in this form.
stdout.close
stderr.close
exit_status = wait_thr.value # Process::Status object returned.
The parameters cmd...
is passed to Process.spawn. So a commandline string and list of argument strings can be accepted as follows.
Open3.popen3("echo a") {|i, o, e, t| ... }
Open3.popen3("echo", "a") {|i, o, e, t| ... }
Open3.popen3(["echo", "argv0"], "a") {|i, o, e, t| ... }
If the last parameter, opts, is a Hash, it is recognized as an option for Process.spawn.
Open3.popen3("pwd", :chdir=>"/") {|i,o,e,t|
p o.read.chomp #=> "/"
}
wait_thr.value waits the termination of the process. The block form also waits the process when it returns.
Closing stdin, stdout and stderr does not wait the process.
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# File 'lib/open3_backport/open3.rb', line 76 def popen3(*cmd) if block_given? begin pid, stdin, stdout, stderr = Open4::popen4(*cmd) wait_thr = detach(pid) stdin.sync = true return yield(stdin, stdout, stderr, wait_thr) ensure stdin.close unless stdin.nil? || stdin.closed? stdout.close unless stdout.nil? || stdout.closed? stderr.close unless stderr.nil? || stderr.closed? wait_thr.value unless wait_thr.nil? end else pid, stdin, stdout, stderr = Open4::popen4(*cmd) stdin.sync = true return [stdin, stdout, stderr, detach(pid)] end end |
.popen_run(cmd, opts, child_io, parent_io) ⇒ Object
:nodoc:
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# File 'lib/open3_backport/original_open3.rb', line 201 def popen_run(cmd, opts, child_io, parent_io) # :nodoc: pid = spawn(*cmd, opts) wait_thr = Process.detach(pid) child_io.each {|io| io.close } result = [*parent_io, wait_thr] if defined? yield begin return yield(*result) ensure parent_io.each{|io| io.close unless io.closed?} wait_thr.join end end result end |
Instance Method Details
#merged_read_stream(*streams) ⇒ Object
:nodoc:
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# File 'lib/open3_backport/open3.rb', line 190 def merged_read_stream(*streams) # :nodoc: raise NotImplementedError end |