Merge pull request #348 from phracek/support_github_matrix

Support GitHub matrix

root/opt/app-root/.gemrc

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+---
+install: --no-document
+update: --no-document
+:benchmark: false
+:update_sources: true
+:bulk_threshold: 1000
+:backtrace: true
+:sources:
+- https://rubygems.org/

root/opt/app-root/etc/puma.cfg

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+def get_max_memory()
+    return ENV['MEMORY_LIMIT_IN_BYTES'].to_i if ENV.has_key? 'MEMORY_LIMIT_IN_BYTES'
+
+    # Assume unlimited memory. 0.size is the number of bytes a Ruby
+    # Fixnum class can hold. One bit is used for sign and one is used
+    # by Ruby to determine whether it's a number or pointer to an object.
+    # That's why we subtract two bits. This expresion should therefore be
+    # the largest signed Fixnum possible.
+    (2 ** (8*0.size - 2) - 1)
+end
+
+def get_memory_per_worker()
+    bytes = ENV.fetch('MEMORY_BYTES_PER_WORKER', '0').to_i
+    if bytes == 0
+        # Comment describing rationale for choosing default of 256MiB/worker is below.
+        bytes = 256 * (2**20)
+    end
+    bytes
+end
+
+def get_min_threads()
+    ENV.fetch('PUMA_MIN_THREADS', '0').to_i
+end
+
+def get_max_threads()
+    ENV.fetch('PUMA_MAX_THREADS', '16').to_i
+end
+
+# Determine the maximum number of workers that are allowed by the available
+# memory.  Puma documentation recommends the maximum number of workers to be
+# set to the number of cores.
+# Unless we're specifically tuned otherwise, allow one worker process per 256MiB
+# memory, to a maximum of 1 worker / core.  Hopefully that'll be a reasonable
+# starting point for average apps; if not, it's all tunable.  The simple
+# OpenShift ruby/rails sample app currently requires approx. 60MiB +
+# 70MiB/worker before taking its first request, so hopefully a default of
+# 256MiB/worker will give other simple apps reasonable default headroom.
+def get_workers()
+    return ENV['PUMA_WORKERS'].to_i if ENV.has_key? 'PUMA_WORKERS'
+
+    cores = ENV.fetch('NUMBER_OF_CORES', '1').to_i
+    max_workers = get_max_memory() / get_memory_per_worker()
+
+    [cores, max_workers].min
+end
+
+environment ENV['RACK_ENV'] || ENV['RAILS_ENV'] || 'production'
+threads     get_min_threads(), get_max_threads()
+workers     get_workers()
+bind        'tcp://0.0.0.0:8080'

root/opt/app-root/etc/scl_enable

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+# IMPORTANT: Do not add more content to this file unless you know what you are
+#            doing. This file is sourced everytime the shell session is opened.
+#
+# This will make scl collection binaries work out of box.
+unset BASH_ENV PROMPT_COMMAND ENV
+source scl_source enable $NODEJS_SCL rh-ruby27