Class: MoSQL::Schema
Instance Method Summary collapse
- #all_columns(schema) ⇒ Object
- #all_mongo_dbs ⇒ Object
- #check_columns!(ns, spec) ⇒ Object
- #collections_for_mongo_db(db) ⇒ Object
- #copy_data(db, ns, objs) ⇒ Object
- #create_schema(db, clobber = false) ⇒ Object
- #fetch_and_delete_dotted(obj, dotted) ⇒ Object
- #find_ns(ns) ⇒ Object
- #find_ns!(ns) ⇒ Object
-
#initialize(map) ⇒ Schema
constructor
A new instance of Schema.
- #parse_spec(ns, spec) ⇒ Object
- #primary_sql_key_for_ns(ns) ⇒ Object
- #quote_copy(val) ⇒ Object
- #table_for_ns(ns) ⇒ Object
- #to_array(lst) ⇒ Object
- #transform(ns, obj, schema = nil) ⇒ Object
- #transform_to_copy(ns, row, schema = nil) ⇒ Object
Methods included from Logging
Constructor Details
#initialize(map) ⇒ Schema
Returns a new instance of Schema.
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# File 'lib/mosql/schema.rb', line 48 def initialize(map) @map = {} map.each do |dbname, db| @map[dbname] ||= {} db.each do |cname, spec| @map[dbname][cname] = parse_spec("#{dbname}.#{cname}", spec) end end end |
Instance Method Details
#all_columns(schema) ⇒ Object
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# File 'lib/mosql/schema.rb', line 144 def all_columns(schema) cols = [] schema[:columns].each do |col| cols << col[:name] end if schema[:meta][:extra_props] cols << "_extra_props" end cols end |
#all_mongo_dbs ⇒ Object
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# File 'lib/mosql/schema.rb', line 194 def all_mongo_dbs @map.keys end |
#check_columns!(ns, spec) ⇒ Object
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# File 'lib/mosql/schema.rb', line 31 def check_columns!(ns, spec) seen = Set.new spec[:columns].each do |col| if seen.include?(col[:source]) raise "Duplicate source #{col[:source]} in column definition #{col[:name]} for #{ns}." end seen.add(col[:source]) end end |
#collections_for_mongo_db(db) ⇒ Object
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# File 'lib/mosql/schema.rb', line 198 def collections_for_mongo_db(db) (@map[db]||{}).keys end |
#copy_data(db, ns, objs) ⇒ Object
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# File 'lib/mosql/schema.rb', line 155 def copy_data(db, ns, objs) schema = find_ns!(ns) db.synchronize do |pg| sql = "COPY \"#{schema[:meta][:table]}\" " + "(#{all_columns(schema).map {|c| "\"#{c}\""}.join(",")}) FROM STDIN" pg.execute(sql) objs.each do |o| pg.put_copy_data(transform_to_copy(ns, o, schema) + "\n") end pg.put_copy_end begin pg.get_result.check rescue PGError => e db.send(:raise_error, e) end end end |
#create_schema(db, clobber = false) ⇒ Object
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# File 'lib/mosql/schema.rb', line 58 def create_schema(db, clobber=false) @map.values.map(&:values).flatten.each do |collection| = collection[:meta] log.info("Creating table '#{[:table]}'...") db.send(clobber ? :create_table! : :create_table?, [:table]) do collection[:columns].each do |col| column col[:name], col[:type] if col[:source].to_sym == :_id primary_key [col[:name].to_sym] end end if [:extra_props] column '_extra_props', 'TEXT' end end end end |
#fetch_and_delete_dotted(obj, dotted) ⇒ Object
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# File 'lib/mosql/schema.rb', line 93 def fetch_and_delete_dotted(obj, dotted) pieces = dotted.split(".") = [] while pieces.length > 1 key = pieces.shift << [obj, key] obj = obj[key] return nil unless obj.is_a?(Hash) end val = obj.delete(pieces.first) .reverse.each do |obj, key| obj.delete(key) if obj[key].empty? end val end |
#find_ns(ns) ⇒ Object
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# File 'lib/mosql/schema.rb', line 77 def find_ns(ns) db, collection = ns.split(".") schema = (@map[db] || {})[collection] if schema.nil? log.debug("No mapping for ns: #{ns}") return nil end schema end |
#find_ns!(ns) ⇒ Object
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# File 'lib/mosql/schema.rb', line 87 def find_ns!(ns) schema = find_ns(ns) raise SchemaError.new("No mapping for namespace: #{ns}") if schema.nil? schema end |
#parse_spec(ns, spec) ⇒ Object
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# File 'lib/mosql/schema.rb', line 41 def parse_spec(ns, spec) out = spec.dup out[:columns] = to_array(spec[:columns]) check_columns!(ns, out) out end |
#primary_sql_key_for_ns(ns) ⇒ Object
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# File 'lib/mosql/schema.rb', line 202 def primary_sql_key_for_ns(ns) find_ns!(ns)[:columns].find {|c| c[:source] == '_id'}[:name] end |
#quote_copy(val) ⇒ Object
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# File 'lib/mosql/schema.rb', line 173 def quote_copy(val) case val when nil "\\N" when true 't' when false 'f' else val.to_s.gsub(/([\\\t\n\r])/, '\\\\\\1') end end |
#table_for_ns(ns) ⇒ Object
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# File 'lib/mosql/schema.rb', line 190 def table_for_ns(ns) find_ns!(ns)[:meta][:table] end |
#to_array(lst) ⇒ Object
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# File 'lib/mosql/schema.rb', line 7 def to_array(lst) array = [] lst.each do |ent| if ent.is_a?(Hash) && ent[:source].is_a?(String) && ent[:type].is_a?(String) # new configuration format array << { :source => ent.delete(:source), :type => ent.delete(:type), :name => ent.first.first, } elsif ent.is_a?(Hash) && ent.keys.length == 1 && ent.values.first.is_a?(String) array << { :source => ent.first.first, :name => ent.first.first, :type => ent.first.last } else raise "Invalid ordered hash entry #{ent.inspect}" end end array end |
#transform(ns, obj, schema = nil) ⇒ Object
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# File 'lib/mosql/schema.rb', line 112 def transform(ns, obj, schema=nil) schema ||= find_ns!(ns) obj = obj.dup row = [] schema[:columns].each do |col| source = col[:source] type = col[:type] v = fetch_and_delete_dotted(obj, source) case v when BSON::Binary, BSON::ObjectId v = v.to_s end row << v end if schema[:meta][:extra_props] # Kludgily delete binary blobs from _extra_props -- they may # contain invalid UTF-8, which to_json will not properly encode. obj.each do |k,v| obj.delete(k) if v.is_a?(BSON::Binary) end row << obj.to_json end log.debug { "Transformed: #{row.inspect}" } row end |
#transform_to_copy(ns, row, schema = nil) ⇒ Object
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# File 'lib/mosql/schema.rb', line 186 def transform_to_copy(ns, row, schema=nil) row.map { |c| quote_copy(c) }.join("\t") end |