Merge branch 'master' into 2955-fail-orphan-jobs
[arvados.git] / services / api / script / crunch-dispatch.rb
1 #!/usr/bin/env ruby
2
3 require 'trollop'
4
5 include Process
6
7 $warned = {}
8 $signal = {}
9 %w{TERM INT}.each do |sig|
10   signame = sig
11   Signal.trap(sig) do
12     $stderr.puts "Received #{signame} signal"
13     $signal[:term] = true
14   end
15 end
16
17 if ENV["CRUNCH_DISPATCH_LOCKFILE"]
18   lockfilename = ENV.delete "CRUNCH_DISPATCH_LOCKFILE"
19   lockfile = File.open(lockfilename, File::RDWR|File::CREAT, 0644)
20   unless lockfile.flock File::LOCK_EX|File::LOCK_NB
21     abort "Lock unavailable on #{lockfilename} - exit"
22   end
23 end
24
25 $trollopts = Trollop::options do
26     opt :use_env, "Pass selected environment variables (PATH, PYTHONPATH, RUBYLIB, GEM_PATH, PERLLIB) to crunch-job"
27 end
28
29 ENV["RAILS_ENV"] = ARGV[0] || ENV["RAILS_ENV"] || "development"
30
31 require File.dirname(__FILE__) + '/../config/boot'
32 require File.dirname(__FILE__) + '/../config/environment'
33 require 'open3'
34
35 LOG_BUFFER_SIZE = 4096
36
37 class Dispatcher
38   include ApplicationHelper
39
40   def sysuser
41     return act_as_system_user
42   end
43
44   def refresh_todo
45     @todo = Job.queue.select do |j| j.repository end
46     @todo_pipelines = PipelineInstance.queue
47   end
48
49   def sinfo
50     @@slurm_version ||= Gem::Version.new(`sinfo --version`.match(/\b[\d\.]+\b/)[0])
51     if Gem::Version.new('2.3') <= @@slurm_version
52       `sinfo --noheader -o '%n:%t'`.strip
53     else
54       # Expand rows with hostname ranges (like "foo[1-3,5,9-12]:idle")
55       # into multiple rows with one hostname each.
56       `sinfo --noheader -o '%N:%t'`.split("\n").collect do |line|
57         tokens = line.split ":"
58         if (re = tokens[0].match /^(.*?)\[([-,\d]+)\]$/)
59           re[2].split(",").collect do |range|
60             range = range.split("-").collect(&:to_i)
61             (range[0]..range[-1]).collect do |n|
62               [re[1] + n.to_s, tokens[1..-1]].join ":"
63             end
64           end
65         else
66           tokens.join ":"
67         end
68       end.flatten.join "\n"
69     end
70   end
71
72   def update_node_status
73     if Server::Application.config.crunch_job_wrapper.to_s.match /^slurm/
74       @nodes_in_state = {idle: 0, alloc: 0, down: 0}
75       @node_state ||= {}
76       node_seen = {}
77       begin
78         sinfo.split("\n").
79           each do |line|
80           re = line.match /(\S+?):+(idle|alloc|down)/
81           next if !re
82
83           # sinfo tells us about a node N times if it is shared by N partitions
84           next if node_seen[re[1]]
85           node_seen[re[1]] = true
86
87           # count nodes in each state
88           @nodes_in_state[re[2].to_sym] += 1
89
90           # update our database (and cache) when a node's state changes
91           if @node_state[re[1]] != re[2]
92             @node_state[re[1]] = re[2]
93             node = Node.where('hostname=?', re[1]).first
94             if node
95               $stderr.puts "dispatch: update #{re[1]} state to #{re[2]}"
96               node.info[:slurm_state] = re[2]
97               node.save
98             elsif re[2] != 'down'
99               $stderr.puts "dispatch: sinfo reports '#{re[1]}' is not down, but no node has that name"
100             end
101           end
102         end
103       rescue
104       end
105     end
106   end
107
108   def start_jobs
109     @todo.each do |job|
110
111       min_nodes = 1
112       begin
113         if job.runtime_constraints['min_nodes']
114           min_nodes = begin job.runtime_constraints['min_nodes'].to_i rescue 1 end
115         end
116       end
117
118       begin
119         next if @nodes_in_state[:idle] < min_nodes
120       rescue
121       end
122
123       next if @running[job.uuid]
124       next if !take(job)
125
126       cmd_args = nil
127       case Server::Application.config.crunch_job_wrapper
128       when :none
129         cmd_args = []
130       when :slurm_immediate
131         cmd_args = ["salloc",
132                     "--chdir=/",
133                     "--immediate",
134                     "--exclusive",
135                     "--no-kill",
136                     "--job-name=#{job.uuid}",
137                     "--nodes=#{min_nodes}"]
138       else
139         raise "Unknown crunch_job_wrapper: #{Server::Application.config.crunch_job_wrapper}"
140       end
141
142       if Server::Application.config.crunch_job_user
143         cmd_args.unshift("sudo", "-E", "-u",
144                          Server::Application.config.crunch_job_user,
145                          "PATH=#{ENV['PATH']}",
146                          "PERLLIB=#{ENV['PERLLIB']}",
147                          "PYTHONPATH=#{ENV['PYTHONPATH']}",
148                          "RUBYLIB=#{ENV['RUBYLIB']}",
149                          "GEM_PATH=#{ENV['GEM_PATH']}")
150       end
151
152       job_auth = ApiClientAuthorization.
153         new(user: User.where('uuid=?', job.modified_by_user_uuid).first,
154             api_client_id: 0)
155       job_auth.save
156
157       crunch_job_bin = (ENV['CRUNCH_JOB_BIN'] || `which arv-crunch-job`.strip)
158       if crunch_job_bin == ''
159         raise "No CRUNCH_JOB_BIN env var, and crunch-job not in path."
160       end
161
162       require 'shellwords'
163
164       arvados_internal = Rails.configuration.git_internal_dir
165       if not File.exists? arvados_internal
166         $stderr.puts `mkdir -p #{arvados_internal.shellescape} && cd #{arvados_internal.shellescape} && git init --bare`
167       end
168
169       src_repo = File.join(Rails.configuration.git_repositories_dir, job.repository + '.git')
170       src_repo = File.join(Rails.configuration.git_repositories_dir, job.repository, '.git') unless File.exists? src_repo
171
172       unless src_repo
173         $stderr.puts "dispatch: #{File.join Rails.configuration.git_repositories_dir, job.repository} doesn't exist"
174         sleep 1
175         untake(job)
176         next
177       end
178
179       $stderr.puts `cd #{arvados_internal.shellescape} && git fetch --no-tags #{src_repo.shellescape} && git tag #{job.uuid.shellescape} #{job.script_version.shellescape}`
180
181       cmd_args << crunch_job_bin
182       cmd_args << '--job-api-token'
183       cmd_args << job_auth.api_token
184       cmd_args << '--job'
185       cmd_args << job.uuid
186       cmd_args << '--git-dir'
187       cmd_args << arvados_internal
188
189       $stderr.puts "dispatch: #{cmd_args}"
190
191       begin
192         i, o, e, t = Open3.popen3({}, *cmd_args, { :unsetenv_others => true})
193       rescue
194         $stderr.puts "dispatch: popen3: #{$!}"
195         sleep 1
196         untake(job)
197         next
198       end
199
200       $stderr.puts "dispatch: job #{job.uuid}"
201       start_banner = "dispatch: child #{t.pid} start #{Time.now.ctime.to_s}"
202       $stderr.puts start_banner
203
204       @running[job.uuid] = {
205         stdin: i,
206         stdout: o,
207         stderr: e,
208         wait_thr: t,
209         job: job,
210         stderr_buf: '',
211         started: false,
212         sent_int: 0,
213         job_auth: job_auth,
214         stderr_buf_to_flush: '',
215         stderr_flushed_at: 0
216       }
217       i.close
218     end
219   end
220
221   def take(job)
222     # no-op -- let crunch-job take care of locking.
223     true
224   end
225
226   def untake(job)
227     # no-op -- let crunch-job take care of locking.
228     true
229   end
230
231   def read_pipes
232     @running.each do |job_uuid, j|
233       job = j[:job]
234
235       # Throw away child stdout
236       begin
237         j[:stdout].read_nonblock(2**20)
238       rescue Errno::EAGAIN, EOFError
239       end
240
241       # Read whatever is available from child stderr
242       stderr_buf = false
243       begin
244         stderr_buf = j[:stderr].read_nonblock(2**20)
245       rescue Errno::EAGAIN, EOFError
246       end
247
248       if stderr_buf
249         j[:stderr_buf] << stderr_buf
250         if j[:stderr_buf].index "\n"
251           lines = j[:stderr_buf].lines("\n").to_a
252           if j[:stderr_buf][-1] == "\n"
253             j[:stderr_buf] = ''
254           else
255             j[:stderr_buf] = lines.pop
256           end
257           lines.each do |line|
258             $stderr.print "#{job_uuid} ! " unless line.index(job_uuid)
259             $stderr.puts line
260             pub_msg = "#{Time.now.ctime.to_s} #{line.strip} \n"
261             j[:stderr_buf_to_flush] << pub_msg
262           end
263
264           if (LOG_BUFFER_SIZE < j[:stderr_buf_to_flush].size) || ((j[:stderr_flushed_at]+1) < Time.now.to_i)
265             write_log j
266           end
267         end
268       end
269     end
270   end
271
272   def reap_children
273     return if 0 == @running.size
274     pid_done = nil
275     j_done = nil
276
277     if false
278       begin
279         pid_done = waitpid(-1, Process::WNOHANG | Process::WUNTRACED)
280         if pid_done
281           j_done = @running.values.
282             select { |j| j[:wait_thr].pid == pid_done }.
283             first
284         end
285       rescue SystemCallError
286         # I have @running processes but system reports I have no
287         # children. This is likely to happen repeatedly if it happens at
288         # all; I will log this no more than once per child process I
289         # start.
290         if 0 < @running.select { |uuid,j| j[:warned_waitpid_error].nil? }.size
291           children = @running.values.collect { |j| j[:wait_thr].pid }.join ' '
292           $stderr.puts "dispatch: IPC bug: waitpid() error (#{$!}), but I have children #{children}"
293         end
294         @running.each do |uuid,j| j[:warned_waitpid_error] = true end
295       end
296     else
297       @running.each do |uuid, j|
298         if j[:wait_thr].status == false
299           pid_done = j[:wait_thr].pid
300           j_done = j
301         end
302       end
303     end
304
305     return if !pid_done
306
307     job_done = j_done[:job]
308     $stderr.puts "dispatch: child #{pid_done} exit"
309     $stderr.puts "dispatch: job #{job_done.uuid} end"
310
311     # Ensure every last drop of stdout and stderr is consumed
312     read_pipes
313     write_log j_done # write any remaining logs
314
315     if j_done[:stderr_buf] and j_done[:stderr_buf] != ''
316       $stderr.puts j_done[:stderr_buf] + "\n"
317     end
318
319     # Wait the thread
320     j_done[:wait_thr].value
321
322     jobrecord = Job.find_by_uuid(job_done.uuid)
323     if jobrecord.started_at
324       # Clean up state fields in case crunch-job exited without
325       # putting the job in a suitable "finished" state.
326       jobrecord.running = false
327       jobrecord.finished_at ||= Time.now
328       if jobrecord.success.nil?
329         jobrecord.success = false
330       end
331       jobrecord.save!
332     else
333       # Don't fail the job if crunch-job didn't even get as far as
334       # starting it. If the job failed to run due to an infrastructure
335       # issue with crunch-job or slurm, we want the job to stay in the
336       # queue.
337     end
338
339     # Invalidate the per-job auth token
340     j_done[:job_auth].update_attributes expires_at: Time.now
341
342     @running.delete job_done.uuid
343   end
344
345   def update_pipelines
346     expire_tokens = @pipe_auth_tokens.dup
347     @todo_pipelines.each do |p|
348       pipe_auth = (@pipe_auth_tokens[p.uuid] ||= ApiClientAuthorization.
349                    create(user: User.where('uuid=?', p.modified_by_user_uuid).first,
350                           api_client_id: 0))
351       puts `export ARVADOS_API_TOKEN=#{pipe_auth.api_token} && arv-run-pipeline-instance --run-here --no-wait --instance #{p.uuid}`
352       expire_tokens.delete p.uuid
353     end
354
355     expire_tokens.each do |k, v|
356       v.update_attributes expires_at: Time.now
357       @pipe_auth_tokens.delete k
358     end
359   end
360
361   def run
362     act_as_system_user
363     @running ||= {}
364     @pipe_auth_tokens ||= { }
365     $stderr.puts "dispatch: ready"
366     while !$signal[:term] or @running.size > 0
367       read_pipes
368       if $signal[:term]
369         @running.each do |uuid, j|
370           if !j[:started] and j[:sent_int] < 2
371             begin
372               Process.kill 'INT', j[:wait_thr].pid
373             rescue Errno::ESRCH
374               # No such pid = race condition + desired result is
375               # already achieved
376             end
377             j[:sent_int] += 1
378           end
379         end
380       else
381         refresh_todo unless did_recently(:refresh_todo, 1.0)
382         update_node_status
383         unless @todo.empty? or did_recently(:start_jobs, 1.0) or $signal[:term]
384           start_jobs
385         end
386         unless (@todo_pipelines.empty? and @pipe_auth_tokens.empty?) or did_recently(:update_pipelines, 5.0)
387           update_pipelines
388         end
389       end
390       reap_children
391       select(@running.values.collect { |j| [j[:stdout], j[:stderr]] }.flatten,
392              [], [], 1)
393     end
394   end
395
396   protected
397
398   def did_recently(thing, min_interval)
399     @did_recently ||= {}
400     if !@did_recently[thing] or @did_recently[thing] < Time.now - min_interval
401       @did_recently[thing] = Time.now
402       false
403     else
404       true
405     end
406   end
407
408   # send message to log table. we want these records to be transient
409   def write_log running_job
410     begin
411       if (running_job && running_job[:stderr_buf_to_flush] != '')
412         log = Log.new(object_uuid: running_job[:job].uuid,
413                       event_type: 'stderr',
414                       owner_uuid: running_job[:job].owner_uuid,
415                       properties: {"text" => running_job[:stderr_buf_to_flush]})
416         log.save!
417         running_job[:stderr_buf_to_flush] = ''
418         running_job[:stderr_flushed_at] = Time.now.to_i
419       end
420     rescue
421       running_job[:stderr_buf] = "Failed to write logs \n"
422       running_job[:stderr_buf_to_flush] = ''
423       running_job[:stderr_flushed_at] = Time.now.to_i
424     end
425   end
426
427 end
428
429 # This is how crunch-job child procs know where the "refresh" trigger file is
430 ENV["CRUNCH_REFRESH_TRIGGER"] = Rails.configuration.crunch_refresh_trigger
431
432 Dispatcher.new.run