Class: Taps::ClientSession
- Inherits:
-
Object
- Object
- Taps::ClientSession
- Defined in:
- lib/taps/client_session.rb
Defined Under Namespace
Classes: CorruptedData
Instance Attribute Summary collapse
-
#database_url ⇒ Object
readonly
Returns the value of attribute database_url.
-
#default_chunksize ⇒ Object
readonly
Returns the value of attribute default_chunksize.
-
#remote_url ⇒ Object
readonly
Returns the value of attribute remote_url.
Class Method Summary collapse
- .quickstart(&block) ⇒ Object
- .start(database_url, remote_url, default_chunksize) {|s| ... } ⇒ Object
Instance Method Summary collapse
- #close_session ⇒ Object
- #cmd_receive ⇒ Object
- #cmd_receive_data ⇒ Object
- #cmd_receive_indexes ⇒ Object
- #cmd_receive_schema ⇒ Object
- #cmd_reset_sequences ⇒ Object
- #cmd_send ⇒ Object
- #cmd_send_data ⇒ Object
- #cmd_send_indexes ⇒ Object
- #cmd_send_reset_sequences ⇒ Object
- #cmd_send_schema ⇒ Object
- #db ⇒ Object
- #fetch_remote_tables_info ⇒ Object
- #fetch_table_rows(table_name, chunksize, offset) ⇒ Object
- #fetch_tables_info ⇒ Object
- #format_number(num) ⇒ Object
- #http_headers(extra = {}) ⇒ Object
-
#initialize(database_url, remote_url, default_chunksize) ⇒ ClientSession
constructor
A new instance of ClientSession.
- #open_session ⇒ Object
- #safe_database_url ⇒ Object
- #safe_remote_url ⇒ Object
- #safe_url(url) ⇒ Object
- #server ⇒ Object
- #session_resource ⇒ Object
- #set_session(uri) ⇒ Object
- #verify_server ⇒ Object
Constructor Details
#initialize(database_url, remote_url, default_chunksize) ⇒ ClientSession
Returns a new instance of ClientSession.
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# File 'lib/taps/client_session.rb', line 13 def initialize(database_url, remote_url, default_chunksize) @database_url = database_url @remote_url = remote_url @default_chunksize = default_chunksize end |
Instance Attribute Details
#database_url ⇒ Object (readonly)
Returns the value of attribute database_url.
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# File 'lib/taps/client_session.rb', line 11 def database_url @database_url end |
#default_chunksize ⇒ Object (readonly)
Returns the value of attribute default_chunksize.
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# File 'lib/taps/client_session.rb', line 11 def default_chunksize @default_chunksize end |
#remote_url ⇒ Object (readonly)
Returns the value of attribute remote_url.
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# File 'lib/taps/client_session.rb', line 11 def remote_url @remote_url end |
Class Method Details
.quickstart(&block) ⇒ Object
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# File 'lib/taps/client_session.rb', line 25 def self.quickstart(&block) start(Taps::Config.database_url, Taps::Config.remote_url, Taps::Config.chunksize) do |s| yield s end end |
.start(database_url, remote_url, default_chunksize) {|s| ... } ⇒ Object
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# File 'lib/taps/client_session.rb', line 19 def self.start(database_url, remote_url, default_chunksize, &block) s = new(database_url, remote_url, default_chunksize) yield s s.close_session end |
Instance Method Details
#close_session ⇒ Object
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# File 'lib/taps/client_session.rb', line 52 def close_session @session_resource.delete(http_headers) if @session_resource end |
#cmd_receive ⇒ Object
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# File 'lib/taps/client_session.rb', line 172 def cmd_receive begin verify_server cmd_receive_schema cmd_receive_data cmd_receive_indexes cmd_reset_sequences rescue RestClient::Exception => e if e.respond_to?(:response) puts "!!! Caught Server Exception" puts "#{e.response.body}" exit(1) else raise end end end |
#cmd_receive_data ⇒ Object
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# File 'lib/taps/client_session.rb', line 190 def cmd_receive_data puts "Receiving data" tables_with_counts, record_count = fetch_remote_tables_info puts "#{tables_with_counts.size} tables, #{format_number(record_count)} records" tables_with_counts.each do |table_name, count| table = db[table_name.to_sym] chunksize = default_chunksize progress = ProgressBar.new(table_name.to_s, count) offset = 0 loop do begin chunksize, rows = fetch_table_rows(table_name, chunksize, offset) rescue CorruptedData next end break if rows == { } table.import(rows[:header], rows[:data]) progress.inc(rows[:data].size) offset += rows[:data].size end progress.finish end end |
#cmd_receive_indexes ⇒ Object
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# File 'lib/taps/client_session.rb', line 265 def cmd_receive_indexes puts "Receiving indexes" index_data = session_resource['indexes'].get(http_headers) output = Taps::Utils.load_indexes(database_url, index_data) puts output if output end |
#cmd_receive_schema ⇒ Object
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# File 'lib/taps/client_session.rb', line 257 def cmd_receive_schema puts "Receiving schema" schema_data = session_resource['schema'].get(http_headers) output = Taps::Utils.load_schema(database_url, schema_data) puts output if output end |
#cmd_reset_sequences ⇒ Object
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# File 'lib/taps/client_session.rb', line 274 def cmd_reset_sequences puts "Resetting sequences" output = Taps::Utils.schema_bin(:reset_db_sequences, database_url) puts output if output end |
#cmd_send ⇒ Object
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# File 'lib/taps/client_session.rb', line 72 def cmd_send begin verify_server cmd_send_schema cmd_send_data cmd_send_indexes cmd_send_reset_sequences rescue RestClient::Exception => e if e.respond_to?(:response) puts "!!! Caught Server Exception" puts "#{e.response.body}" exit(1) else raise end end end |
#cmd_send_data ⇒ Object
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# File 'lib/taps/client_session.rb', line 110 def cmd_send_data puts "Sending data" tables_with_counts, record_count = fetch_tables_info puts "#{tables_with_counts.size} tables, #{format_number(record_count)} records" db.tables.each do |table_name| table = db[table_name] count = table.count order = Taps::Utils.order_by(db, table_name) chunksize = self.default_chunksize string_columns = Taps::Utils.incorrect_blobs(db, table_name) progress = ProgressBar.new(table_name.to_s, count) offset = 0 loop do row_size = 0 chunksize = Taps::Utils.calculate_chunksize(chunksize) do |c| rows = Taps::Utils.format_data(table.order(*order).limit(c, offset).all, string_columns) break if rows == { } row_size = rows[:data].size gzip_data = Taps::Utils.gzip(Marshal.dump(rows)) begin session_resource["tables/#{table_name}"].post(gzip_data, http_headers({ :content_type => 'application/octet-stream', :taps_checksum => Taps::Utils.checksum(gzip_data).to_s})) rescue RestClient::RequestFailed => e # retry the same data, it got corrupted somehow. if e.http_code == 412 next end raise end end progress.inc(row_size) offset += row_size break if row_size == 0 end progress.finish end end |
#cmd_send_indexes ⇒ Object
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# File 'lib/taps/client_session.rb', line 90 def cmd_send_indexes puts "Sending indexes" index_data = Taps::Utils.schema_bin(:indexes, database_url) session_resource['indexes'].post(index_data, http_headers) end |
#cmd_send_reset_sequences ⇒ Object
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# File 'lib/taps/client_session.rb', line 104 def cmd_send_reset_sequences puts "Resetting sequences" session_resource["reset_sequences"].post('', http_headers) end |
#cmd_send_schema ⇒ Object
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# File 'lib/taps/client_session.rb', line 97 def cmd_send_schema puts "Sending schema" schema_data = Taps::Utils.schema_bin(:dump, database_url) session_resource['schema'].post(schema_data, http_headers) end |
#db ⇒ Object
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# File 'lib/taps/client_session.rb', line 31 def db @db ||= Sequel.connect(database_url) end |
#fetch_remote_tables_info ⇒ Object
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# File 'lib/taps/client_session.rb', line 241 def fetch_remote_tables_info retries = 0 max_retries = 1 begin tables_with_counts = Marshal.load(session_resource['tables'].get(http_headers)) record_count = tables_with_counts.values.inject(0) { |a,c| a += c } rescue RestClient::Exception retries += 1 retry if retries <= max_retries puts "Unable to fetch tables information from #{remote_url}. Please check the server log." exit(1) end [ tables_with_counts, record_count ] end |
#fetch_table_rows(table_name, chunksize, offset) ⇒ Object
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# File 'lib/taps/client_session.rb', line 224 def fetch_table_rows(table_name, chunksize, offset) response = nil chunksize = Taps::Utils.calculate_chunksize(chunksize) do |c| response = session_resource["tables/#{table_name}/#{c}?offset=#{offset}"].get(http_headers) end raise CorruptedData unless Taps::Utils.valid_data?(response.to_s, response.headers[:taps_checksum]) begin rows = Marshal.load(Taps::Utils.gunzip(response.to_s)) rescue Object => e puts "Error encountered loading data, wrote the data chunk to dump.#{Process.pid}.gz" File.open("dump.#{Process.pid}.gz", "w") { |f| f.write(response.to_s) } raise end [chunksize, rows] end |
#fetch_tables_info ⇒ Object
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# File 'lib/taps/client_session.rb', line 160 def fetch_tables_info record_count = 0 tables = db.tables tables_with_counts = tables.inject({}) do |accum, table| accum[table] = db[table].count record_count += accum[table] accum end [ tables_with_counts, record_count ] end |
#format_number(num) ⇒ Object
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# File 'lib/taps/client_session.rb', line 281 def format_number(num) num.to_s.gsub(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1,") end |
#http_headers(extra = {}) ⇒ Object
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# File 'lib/taps/client_session.rb', line 68 def http_headers(extra = {}) { :taps_version => Taps.compatible_version }.merge(extra) end |
#open_session ⇒ Object
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# File 'lib/taps/client_session.rb', line 43 def open_session uri = server['sessions'].post('', http_headers) server[uri] end |
#safe_database_url ⇒ Object
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# File 'lib/taps/client_session.rb', line 64 def safe_database_url safe_url(database_url) end |
#safe_remote_url ⇒ Object
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# File 'lib/taps/client_session.rb', line 60 def safe_remote_url safe_url(remote_url) end |
#safe_url(url) ⇒ Object
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# File 'lib/taps/client_session.rb', line 56 def safe_url(url) url.sub(/\/\/(.+?)?:(.*?)@/, '//\1:[hidden]@') end |
#server ⇒ Object
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# File 'lib/taps/client_session.rb', line 35 def server @server ||= RestClient::Resource.new(remote_url) end |
#session_resource ⇒ Object
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# File 'lib/taps/client_session.rb', line 39 def session_resource @session_resource ||= open_session end |
#set_session(uri) ⇒ Object
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# File 'lib/taps/client_session.rb', line 48 def set_session(uri) @session_resource = server[uri] end |
#verify_server ⇒ Object
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# File 'lib/taps/client_session.rb', line 285 def verify_server begin server['/'].get(http_headers) rescue RestClient::RequestFailed => e if e.http_code == 417 puts "#{safe_remote_url} is running a different minor version of taps." puts "#{e.response.body}" exit(1) else raise end rescue RestClient::Unauthorized puts "Bad credentials given for #{safe_remote_url}" exit(1) rescue Errno::ECONNREFUSED puts "Can't connect to #{safe_remote_url}. Please check that it's running" exit(1) end end |