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Contents
module Startback
class Context
#
# Rack middleware that installs a particular context instance
# on the Rack environment.
#
# Examples:
#
# # Use the default context class
# Rack::Builder.new do
# use Startback::Context::Middleware
#
# run ->(env){
# ctx = env[Startback::Context::Middleware::RACK_ENV_KEY]
# ctx.is_a?(Startback::Context) # => true
# }
# end
#
# # Use a user defined context class
# Rack::Builder.new do
# use Startback::Context::Middleware, context_class: MyContextClass
#
# run ->(env){
# ctx = env[Startback::Context::Middleware::RACK_ENV_KEY]
# ctx.is_a?(MyContextClass) # => true (your subclass)
# ctx.is_a?(Startback::Context) # => true (required!)
# }
# end
#
class Middleware
RACK_ENV_KEY = 'SAMBACK_CONTEXT'
DEFAULT_OPTIONS = {
context_class: Context
}
def initialize(app, options = {})
@app = app
@options = DEFAULT_OPTIONS.merge(options || {})
end
attr_reader :options
def call(env)
env[RACK_ENV_KEY] ||= options[:context_class].h({}).tap{|c|
c.original_rack_env = env.dup
}
@app.call(env)
end
def self.context(env)
env[RACK_ENV_KEY]
end
end # class Middleware
end # class Context
end # module Startback
Version data entries
27 entries across 27 versions & 1 rubygems