Module: PgMetrics::PgbouncerMetrics

Defined in:
lib/pg_metrics/pgbouncer_metrics.rb

Class Method Summary collapse

Class Method Details

.conn_str(conn_info, dbname = "pgbouncer", user = "admin") ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 23

def self.conn_str(conn_info, dbname = "pgbouncer", user = "admin")
  [conn_info, %(dbname=#{dbname}), %(user=#{user})].join(" ")
end

.extract_backend_metrics(database_results, pool_results) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 74

def self.extract_backend_metrics(database_results, pool_results)
  databases = database_results.inject({}) do |memo, tup|
    user = tup["force_user"].nil? ? :sameuser : tup["force_user"]
    host = tup["host"].nil? ? "localhost" : tup["host"]
    memo[tup["name"]] = {:host => host, :port => tup["port"], :database => tup["database"], :user => user}
    memo
  end

  sum_cols = %w(cl_active cl_waiting sv_active sv_idle sv_used sv_tested sv_login)
  max_cols = %w(max_wait)
  cols = sum_cols.concat(max_cols)
  sums = pool_results.inject({}) do |memo, tup|
    database = databases[tup["database"]]
    next memo if database.nil?
    user = database[:user] === :sameuser ? tup["user"] : database[:user]
    key = [database[:host], database[:port], database[:database], user]
    vals = memo[key] || {
      "cl_active" => 0,
      "cl_waiting" => 0,
      "sv_active" => 0,
      "sv_idle" => 0,
      "sv_used" => 0,
      "sv_tested" => 0,
      "sv_login" => 0,
      "max_wait" => 0
    }
    sum_cols.each { |col| vals[col] += tup[col].to_i }
    max_cols.each { |col| vals[col] = [tup[col].to_i, vals[col]].max }
    memo[key] = vals
    memo
  end
  sums.inject([]) do |memo, (key, val)|
    cols.each do |col|
      k = ["backends"] + key + [col]
      memo << [k, val[col]]
    end
    memo
  end
end

.extract_database_metrics(results) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 64

def self.extract_database_metrics(results)
  cols = %w(pool_size reserve_pool)
  results.inject([]) do |memo, tup|
    cols.each do |col|
      memo << [["databases", tup["name"], col], tup[col]]
    end
    memo
  end
end

.extract_pool_metrics(results) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 50

def self.extract_pool_metrics(results)
  cols = %w(cl_active  cl_waiting sv_active sv_idle sv_used sv_tested sv_login maxwait)
  results.inject([]) do |memo, tup|
    cols.each do |col|
      memo << [["pools", tup["database"], tup["user"], col], tup[col]]
    end
    memo
  end
end

.fetch_databases(conn) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 60

def self.fetch_databases(conn)
  conn.exec("SHOW databases")
end

.fetch_pgbouncer_metrics(app_name, conn_info) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 6

def self.fetch_pgbouncer_metrics(app_name, conn_info)
  metrics = []
  conn = make_conn(conn_str(conn_info), app_name)
  metrics = metrics.concat(fetch_stats_metrics(conn))
  pool_results = fetch_pools(conn)
  metrics = metrics.concat(extract_pool_metrics(pool_results))
  database_results = fetch_databases(conn)
  metrics = metrics.concat(extract_database_metrics(database_results))
  metrics = metrics.concat(extract_backend_metrics(database_results, pool_results))
  conn.finish
  filter_metrics(metrics)
end

.fetch_pools(conn) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 46

def self.fetch_pools(conn)
  conn.exec("SHOW pools")
end

.fetch_stats_metrics(conn) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 33

def self.fetch_stats_metrics(conn)
  cols = %w(total_requests total_received total_sent total_query_time avg_req avg_recv avg_sent avg_query)
  metrics = []
  conn.exec("SHOW stats") do |results|
    results.each do |tup|
      cols.each do |col|
        metrics << [["stats", tup["database"], col], tup[col]]
      end
    end
  end
  metrics
end

.filter_metrics(metrics, regexp = nil) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 27

def self.filter_metrics(metrics, regexp = nil)
  metrics.reject! { |m| m[1].nil? }
  metrics.reject! { |m| m[0].any? { |k| k =~ regexp  } } if regexp
  metrics.inject([]) { |memo, m| memo << [sanitize_key(m[0]), m[1]] }
end

.make_conn(conn_str, app_name) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 19

def self.make_conn(conn_str, app_name)
  PG::Connection.new(conn_str)
end

.sanitize_key(key) ⇒ Object 



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# File 'lib/pg_metrics/pgbouncer_metrics.rb', line 114

def self.sanitize_key(key)
  key.inject([]) { |memo, el| memo << el.gsub(/[^-a-zA-Z_0-9]/, "_") }
end