Class: SvelteOnRails::SsrServer

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/svelte_on_rails/ssr_server.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dry_run_ppid: nil) ⇒ SsrServer

Returns a new instance of SsrServer.



24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 24

def initialize(dry_run_ppid: nil)

  SvelteOnRails::Lib::Utils.secure_debug_log("SOR Server initialize called")

  @socket_namespace = [
    "svelte-ssr",
    Rails.application.class.module_parent_name[0..30],
    Rails.env,
  ].join("-")
  @dry_run_ppid = dry_run_ppid if dry_run_ppid

  @logfile_path = Rails.root.join("log/svelte-ssr-server-#{Rails.env}.log")
  @logfile_max_lines = build_logfile_max_lines
  @socket_path = build_socket_path
  @use_ssr_server = SvelteOnRails::Configuration.instance.configs[:use_ssr_server]
  @node_bin = SvelteOnRails::Configuration.instance.node_bin_path
  @ssr_server_bin_path = Rails.root.join(Pathname('node_modules/@csedl/svelte-on-rails/bin/svelte-ssr-server.js'))
  @ssr_server_ppid_file = Rails.root.join("tmp", "pids", 'svelte_on_rails.ppid')

  if @use_ssr_server
    # if !defined?(Rails::Server)
    #   SvelteOnRails::Lib::Utils.secure_debug_log("Rails Server is not yet defined, SSR Server cannot be started because of initializing too early")
    # else

      SvelteOnRails::Lib::Utils.secure_debug_log("SOR using svelte-ssr-server called, now starting node-server...")

      start_node_server!
      #end
    at_exit do
      kill_my_server
    end
  else
    SvelteOnRails::Lib::Utils.secure_debug_log("SSR Server NOT used => @use_ssr_server #{@use_ssr_server}")
    SvelteOnRails::Lib::Utils.secure_debug_log("SSR Server NOT used => @use_ssr_server #{defined?(Rails::Server)}")
  end

end

Instance Attribute Details

#logfile_max_lines ⇒ Object (readonly)

Returns the value of attribute logfile_max_lines.



9
10
11
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def logfile_max_lines
  @logfile_max_lines
end

#logfile_path ⇒ Object (readonly)

Returns the value of attribute logfile_path.



9
10
11
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def logfile_path
  @logfile_path
end

#node_bin ⇒ Object (readonly)

Returns the value of attribute node_bin.



9
10
11
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def node_bin
  @node_bin
end

#socket_namespace ⇒ Object (readonly)

Returns the value of attribute socket_namespace.



9
10
11
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def socket_namespace
  @socket_namespace
end

#socket_path ⇒ Object (readonly)

Returns the value of attribute socket_path.



9
10
11
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def socket_path
  @socket_path
end

#ssr_server_bin_path ⇒ Object (readonly)

Returns the value of attribute ssr_server_bin_path.



9
10
11
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def ssr_server_bin_path
  @ssr_server_bin_path
end

#ssr_server_ppid_file ⇒ Object (readonly)

Returns the value of attribute ssr_server_ppid_file.



9
10
11
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def ssr_server_ppid_file
  @ssr_server_ppid_file
end

Class Method Details

.instance(dry_run_ppid: nil) ⇒ Object

methods



19
20
21
22
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 19

def self.instance(dry_run_ppid: nil)
  SvelteOnRails::Lib::Utils.secure_debug_log("SOR Server instance called")
  @instance ||= new(dry_run_ppid: dry_run_ppid)
end

Instance Method Details

#alive? ⇒ Boolean

Returns:

  • (Boolean) 


274
275
276
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 274

def alive?
  @alive
end

#configured? ⇒ Boolean

Returns:

  • (Boolean) 


150
151
152
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 150

def configured?
  @configured ||= File.exist?(@ssr_server_bin_path)
end

#kill_leftover_processes ⇒ Object 



235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 235

def kill_leftover_processes
  stdout, stderr, status = Open3.capture3(
    "ps aux | grep svelte"
  )

  leftover = stdout.split("\n").map do |line|
    if line.match?(/\/#{@socket_namespace}-[0-9]+.sock$/)
      unless line.match?(/\/#{@socket_namespace}-#{Process.ppid}.sock$/)
        line.match(/[0-9]+/).to_s.to_i
      end
    end
  end.compact

  stdout, stderr, status = Open3.capture3(
    "kill #{leftover.join(' ')}"
  )

  start_server_log(nil, "Killed #{leftover.length} leftover processes") if leftover.length >= 1
end

#kill_my_server ⇒ Object 



255
256
257
258
259
260
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 255

def kill_my_server
  Process.kill("SIGINT", (node_server_pid || 0)) if node_server_pid
  File.delete(@ssr_server_ppid_file)
rescue

end

#node_server_pid ⇒ Object 



278
279
280
281
282
283
284
285
286
287
288
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 278

def node_server_pid
  stdout, stderr, status = Open3.capture3(
    "ps aux | grep svelte"
  )
  stdout.split("\n").each do |line|
    if line.include?("#{@socket_namespace}-#{Process.ppid}.sock")
      return line.match(/[0-9]+/).to_s.to_i
    end
  end
  nil
end

#parse_body_json(response_string) ⇒ Object 



140
141
142
143
144
145
146
147
148
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 140

def parse_body_json(response_string)
  return {} unless response_string.to_s.present?

  body = response_string.split("\r\n\r\n", 2)[1]
  json_start = body.index('{')
  json_end = body.rindex('}')
  json_str = body[json_start..json_end]
  JSON.parse(json_str)
end

#ping? ⇒ Boolean

Returns:

  • (Boolean) 


154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 154

def ping?
  @alive = false
  shorten_logfile
  unless File.exist?(socket_path)
    return false
  end
  response = ''
  begin
    sock = UNIXSocket.new(socket_path)
    request = "GET /health HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n\r\n"
    sock.write(request)
    response = sock.read
    sock.close
  rescue => e
    puts "[SOR] Ping Failed: #{e.message}"
  end
  if response.match?(/^HTTP\/\d\.\d 200/)
    r = parse_body_json(response)
    unless r['version'].split('.').first.to_i >= 14
      puts "[SOR] WARNING: Required SSR Server version is at least 14.x, you have installed @csedl/svelte-on-rails: #{r['version']}"
    end
    @alive = r['status'] == 'alive'
  end
end

#render(component, props, debug, view_path_proc) ⇒ Object 



62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 62

def render(component, props, debug, view_path_proc)

  # fetch asset
  manifest = SvelteOnRails::Configuration.instance.manifest(debug, component[:name])
  _asset_path = manifest[component[:path]]['file']
  full_asset_path = Rails.root.join('public', 'svelte-ssr', _asset_path)

  body_json = { component: full_asset_path, props: props }.to_json

  request = "POST /render HTTP/1.1\r\n" +
            "Host: localhost\r\n" +
            "Content-Type: application/json\r\n" +
            "Content-Length: #{body_json.bytesize}\r\n" +
            "Connection: close\r\n\r\n"

  begin
    socket = UNIXSocket.new(socket_path)
    socket.write(request + body_json)
    response = socket.read
    socket.close
  rescue => e
    if e.is_a?(Errno::ECONNREFUSED)
      SvelteOnRails::Lib::Utils.error_log(
        :ssr_server_unreachable,
        "Render #{component[:file_basename]}.svelte",
        [
          "The SSR Server is not reachable.\nYou may need to restart your app.",
          "#{e}",
          SvelteOnRails::Lib::Utils.backtrace_until_sor(e).join("\n")
        ]
      )
      return { success: false, ssr_server_unreachable: true }
    else
      raise e
    end
    restart_my_server
  end

  shorten_logfile

  raw_response = parse_body_json(response)
  if raw_response['status'] == 'SUCCESS'
    htm = raw_response['html'].to_s
                              .gsub('<!--[-->', '')
                              .gsub('<!--]-->', '')
                              .gsub('<!---->', '')

    {
      success: true,
      html: htm,
      head: raw_response['head'].to_s,
    }
  else
    config = SvelteOnRails::Configuration.instance
    comp = Rails.root.join(component[:path]).to_s
    imps = if config.watch_changes?
             _src = config.fetch_source_files(component[:path], false, '')
             sources = _src.select { |f| f != comp }
             (sources.present? ? "\nImports:\n#{sources.join("\n")}" : '')
           else
             ''
           end
    utils = SvelteOnRails::Lib::Utils
    utils.error_log(
      :render_failed,
      "Render #{component[:file_basename]}.svelte",
      [
        raw_response['logs'].to_a.join("\n"),
        "View:\n#{view_path_proc.call}\nComponent:\n#{Rails.root.join(component[:path]).to_s}#{imps}",
      ]
    )
    {
      success: false,
    }
  end

end

#restart_my_server ⇒ Object 



262
263
264
265
266
267
268
269
270
271
272
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 262

def restart_my_server
  return unless @server_restarted_time > 1.minutes.ago
  @server_restarted_count ||= 1
  kill_my_server
  begin
    start_node_server!("Restart-after-failure-#{@server_restarted_count}")
    @server_restarted_time = Time.now
    @server_restarted_count += 1
  rescue
  end
end

#start_node_server!(started_by = "rails-boot-#{Rails.env}-#{Process.ppid}") ⇒ Object 



179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
 
# File 'lib/svelte_on_rails/ssr_server.rb', line 179

def start_node_server!(started_by = "rails-boot-#{Rails.env}-#{Process.ppid}")

  SvelteOnRails::Lib::Utils.secure_debug_log("SOR start_node_server! called")

  # notice ppid
  unless @dry_run_ppid
    FileUtils.mkdir_p(@ssr_server_ppid_file.dirname)
    File.write(@ssr_server_ppid_file, Process.ppid.to_s)
  end

  start = Time.now
  cmd = [
    "SVELTE_SSR_SERVER_STARTED_BY=r#{started_by}",
    @node_bin,
    @ssr_server_bin_path,
    @socket_path
  ].join(' ')

  @node_server_output = {}
  Thread.new do
    stdout, stderr, status = Open3.capture3(
      cmd,
      chdir: Rails.root
    )
    @node_server_output = {
      stdout: stdout,
      stderr: stderr,
      status: status
    }
  end
  start_server_log(start, "Node Version: #{Configuration.instance.node_version_test}, package version: #{Configuration.instance.npm_package_version_test}")
  start_server_log(start, "Start running Svelte-SSR-Server...")

  until node_server_pid do
    sleep 0.12
    start_server_log(start, "Waiting for node server process-id")
    start_server_timeout!(start)
  end

  until File.exist?(socket_path) do
    sleep 0.1
    start_server_log(start, "Waiting for socket to be created")
    start_server_timeout!(start)
  end
  start_server_log(start, "Socket created: #{socket_path}")

  until ping? do
    start_server_log(start, "Waiting for successful server-response")
    start_server_timeout!(start)
    sleep 0.1
  end
  start_server_log(start, "Server responded successfully")

  kill_leftover_processes
end