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|
# encoding: UTF-8
#-- vim:sw=2:et
#++
#
# :title: journal backend for postgresql
require 'pg'
require 'json'
# as a replacement for CREATE INDEX IF NOT EXIST that is not in postgres.
# define function to be able to create an index in case it doesnt exist:
# source: http://stackoverflow.com/a/26012880
CREATE_INDEX = <<-EOT
CREATE OR REPLACE FUNCTION create_index(table_name text, index_name text, column_name text) RETURNS void AS $$
declare
l_count integer;
begin
select count(*)
into l_count
from pg_indexes
where schemaname = 'public'
and tablename = lower(table_name)
and indexname = lower(index_name);
if l_count = 0 then
execute 'create index ' || index_name || ' on ' || table_name || '(' || column_name || ')';
end if;
end;
$$ LANGUAGE plpgsql;
EOT
module Irc
class Bot
module Journal
module Storage
class PostgresStorage < AbstractStorage
attr_reader :conn
def initialize(opts={})
@uri = opts[:uri] || 'postgresql://localhost/rbot'
@conn = PG.connect(@uri)
@conn.exec('set client_min_messages = warning')
@conn.exec(CREATE_INDEX)
@version = @conn.exec('SHOW server_version;')[0]['server_version']
@version.gsub!(/^(\d+\.\d+)$/, '\1.0')
log 'journal storage: postgresql connected to version: ' + @version
version = @version.split('.')[0,3].join.to_i
if version < 930
raise StorageError.new(
'PostgreSQL Version too old: %s, supported: >= 9.3' % [@version])
end
@jsonb = (version >= 940)
log 'journal storage: no jsonb support, consider upgrading postgres' unless @jsonb
drop if opts[:drop]
create_table
create_index('topic_index', 'topic')
create_index('timestamp_index', 'timestamp')
end
def create_table
@conn.exec('
CREATE TABLE IF NOT EXISTS journal
(id UUID PRIMARY KEY,
topic TEXT NOT NULL,
timestamp TIMESTAMP WITH TIME ZONE NOT NULL,
payload %s NOT NULL)' % [@jsonb ? 'JSONB' : 'JSON'])
end
def create_index(index_name, column_name)
debug 'journal postges backend: create index %s for %s' % [
index_name, column_name]
@conn.exec_params('SELECT create_index($1, $2, $3)', [
'journal', index_name, column_name])
end
def create_payload_index(key)
index_name = 'idx_payload_' + key.gsub('.', '_')
column = sql_payload_selector(key)
create_index(index_name, column)
end
def ensure_index(key)
create_payload_index(key)
end
def insert(m)
@conn.exec_params('INSERT INTO journal VALUES ($1, $2, $3, $4);',
[m.id, m.topic, m.timestamp, JSON.generate(m.payload)])
end
def find(query=nil, limit=100, offset=0, &block)
def to_message(row)
timestamp = DateTime.strptime(row['timestamp'], '%Y-%m-%d %H:%M:%S%z')
JournalMessage.new(id: row['id'], timestamp: timestamp,
topic: row['topic'], payload: JSON.parse(row['payload']))
end
if query
sql, params = query_to_sql(query)
sql = 'SELECT * FROM journal WHERE ' + sql + ' LIMIT %d OFFSET %d' % [limit.to_i, offset.to_i]
else
sql = 'SELECT * FROM journal LIMIT %d OFFSET %d' % [limit.to_i, offset.to_i]
params = []
end
res = @conn.exec_params(sql, params)
if block_given?
res.each { |row| block.call(to_message(row)) }
else
res.map { |row| to_message(row) }
end
end
# returns the number of messages that match the query
def count(query=nil)
if query
sql, params = query_to_sql(query)
sql = 'SELECT COUNT(*) FROM journal WHERE ' + sql
else
sql = 'SELECT COUNT(*) FROM journal'
params = []
end
res = @conn.exec_params(sql, params)
res[0]['count'].to_i
end
def remove(query=nil)
if query
sql, params = query_to_sql(query)
sql = 'DELETE FROM journal WHERE ' + sql
else
sql = 'DELETE FROM journal;'
params = []
end
res = @conn.exec_params(sql, params)
end
def drop
@conn.exec('DROP TABLE journal;') rescue nil
end
def sql_payload_selector(key)
selector = 'payload'
k = key.to_s.split('.')
k.each_index { |i|
if i >= k.length-1
selector += '->>\'%s\'' % [@conn.escape_string(k[i])]
else
selector += '->\'%s\'' % [@conn.escape_string(k[i])]
end
}
selector
end
def query_to_sql(query)
params = []
placeholder = Proc.new do |value|
params << value
'$%d' % [params.length]
end
sql = {op: 'AND', list: []}
# ID query OR condition
unless query.id.empty?
sql[:list] << {
op: 'OR',
list: query.id.map { |id|
'id = ' + placeholder.call(id)
}
}
end
# Topic query OR condition
unless query.topic.empty?
sql[:list] << {
op: 'OR',
list: query.topic.map { |topic|
'topic ILIKE ' + placeholder.call(topic.gsub('*', '%'))
}
}
end
# Timestamp range query AND condition
if query.timestamp[:from] or query.timestamp[:to]
list = []
if query.timestamp[:from]
list << 'timestamp >= ' + placeholder.call(query.timestamp[:from])
end
if query.timestamp[:to]
list << 'timestamp <= ' + placeholder.call(query.timestamp[:to])
end
sql[:list] << {
op: 'AND',
list: list
}
end
# Payload query
unless query.payload.empty?
list = []
query.payload.each_pair do |key, value|
selector = sql_payload_selector(key)
list << selector + ' = ' + placeholder.call(value)
end
sql[:list] << {
op: 'OR',
list: list
}
end
sql = sql[:list].map { |stmt|
'(' + stmt[:list].join(' %s ' % [stmt[:op]]) + ')'
}.join(' %s ' % [sql[:op]])
[sql, params]
end
end
end
end # Journal
end # Bot
end # Irc
|
