Trying out crystal lang

Author: hholst80

.editorconfig

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+root = true
+
+[*.cr]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

.gitignore

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+/docs/
+/lib/
+/bin/
+/.shards/
+*.dwarf

README.md

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 Docker container state and health check.
 
-## Requirements
-
-Tested on: Node v12; Express v4; and [apocas/dockerode] v3.
-
-[apocas/dockerode]: https://github.com/apocas/dockerode
-
 ## Example use
 
 Returns status code 200 if and only if container is healthy.
 
 Example use:
 
     $ curl -I http://localhost:3000/node
-    HTTP/1.1 200 OK
-    X-Powered-By: Express
-    Content-Type: application/json; charset=utf-8
-    Content-Length: 5770
-    ETag: W/"168a-5eUBcpHavWjKjs0OWb8kmeXZdVs"
-    Date: Thu, 04 Jun 2020 13:48:10 GMT
-    Connection: keep-alive
-
-## TODO
-
-Use a smaller framework than express, or no framework at all?

UNLICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

shard.yml

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+name: docker-state
+version: 0.1.0
+
+authors:
+  - Henrik Holst <[email protected]>
+
+targets:
+  docker-healthz:
+    main: src/docker-healthz.cr
+
+dependencies:
+  json_mapping:
+    github: crystal-lang/json_mapping.cr
+  router:
+    github: tbrand/router.cr
+  docker:
+    github: hholst80/docker.cr
+
+crystal: ">= 1.0.0"

src/app.js

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+#require "http/server"
+require "router"
+require "json"
+require "docker"
+require "socket"
+
+class WebServer
+  include Router
+  @client = Docker.client
+  @server : HTTP::Server | Nil
+
+  def draw_routes
+    get "/:id" do |context, params|
+      id = params["id"]
+      #context.response.print Docker.client.containers
+      #res = Docker.client.post("/containers/#{id}")
+      res = Docker.client.get "/v1.30/containers/#{id}/json"
+      context.response.status_code = res.status_code
+      if res.status_code != 200
+        context.response.print res.body
+        context
+      else
+        #res = @client.post("/containers/#{id}")
+        #case res.status_code
+        #when 404
+        #  raise Docker::Client::Exception.new("no such container")
+        #when 500
+        #  raise Docker::Client::Exception.new("server error")
+        #end
+        state_json = Hash(String, JSON::Any).from_json(res.body)
+        context.response.print state_json["State"].to_json, "\n"
+        context
+      end
+    end
+  end
+
+  def run
+    @client = Docker::Client.new
+    server = HTTP::Server.new(route_handler)
+    address = server.bind_tcp 8080
+    puts "Listening on http://#{address}"
+    server.listen
+  end
+end
+
+#{'Dead': False,
+# 'Error': '',
+# 'ExitCode': 0,
+# 'FinishedAt': '2021-01-09T19:45:21.120602084Z',
+# 'OOMKilled': False,
+# 'Paused': False,
+# 'Pid': 171432,
+# 'Restarting': False,
+# 'Running': True,
+# 'StartedAt': '2021-06-05T11:24:27.11380333Z',
+# 'Status': 'running'}
+#
+
+struct State
+  include JSON::Serializable
+  @Dead       : Bool
+  @Error      : String
+  @ExitCode   : Int32
+  @FinishedAt : String
+  @OOMKilled  : Bool
+  @Paused     : Bool
+  @Pid        : Int32
+  @Restarting : Bool
+  @Running    : Bool
+  @StartedAt  : String
+  @Status     : String
+end
+
+# Docker.client.info
+# #containers = Docker.client.containers
+# #info = Docker.client.info
+# res = Docker.client.get "/v1.30/containers/hello/json"
+# case res.status_code
+# when 404
+#   pp "no such container"
+# when 500
+#   pp "server error"
+# end
+# #puts res.body
+# #puts "--------------------"
+# state_json = Hash(String, JSON::Any).from_json(res.body)
+# p state_json["State"]
+# #puts State.from_json(state_json["State"])
+# puts "------------------------------"
+# #puts State.from_json(state_json)
+
+#p containers.first
+#p info
+
+web_server = WebServer.new
+web_server.draw_routes
+web_server.run