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Contents
module Services
module Logger
class Redis
META_CLASSES = [
NilClass,
TrueClass,
FalseClass,
Symbol,
String,
Numeric
].freeze
InvalidMetaError = Class.new(StandardError)
EmptyResponseFromRedisMultiError = Class.new(StandardError)
def initialize(redis, key = 'logs')
@redis, @key = redis, key
end
def log(message, meta = {}, severity = 'info')
# Allow only simple data types in meta
raise InvalidMetaError, "Meta keys and values must be of one of the following classes: #{META_CLASSES.join(', ')}" if meta_includes_invalid_values?(meta)
value = {
time: Time.now.to_i,
message: message.to_s,
severity: severity.to_s,
meta: meta
}
@redis.lpush @key, value.to_json
end
def size
@redis.llen @key
end
def fetch
@redis.lrange(@key, 0, -1).map(&method(:log_entry_from_json))
end
def clear
response = 3.tries on: EmptyResponseFromRedisMultiError do
@redis.multi do
@redis.lrange @key, 0, -1
@redis.del @key
end or raise EmptyResponseFromRedisMultiError
end
response.first.map(&method(:log_entry_from_json))
end
private
def log_entry_from_json(json)
data = JSON.load(json)
data['time'] = Time.at(data['time'])
data
end
def meta_includes_invalid_values?(meta)
[meta.values, meta.keys].any? do |elements|
elements.any? do |element|
META_CLASSES.none? do |klass|
element.class <= klass
end
end
end
end
end
end
end
Version data entries
25 entries across 25 versions & 1 rubygems