Class: PgHero::HomeController

Inherits:
ActionController::Base
  • Object
show all
Defined in:
app/controllers/pg_hero/home_controller.rb

Instance Method Summary collapse

Instance Method Details

#connection_stats ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 209

def connection_stats
  render json: [{name: "Connections", data: @database.connection_stats(system_params), library: chart_library_options}]
end

#connections ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 261

def connections
  @title = "Connections"
  @connection_sources = @database.connection_sources
  @total_connections = @connection_sources.sum { |cs| cs[:total_connections] }

  @connections_by_database = group_connections(@connection_sources, :database)
  @connections_by_user = group_connections(@connection_sources, :user)
end

#cpu_usage ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 205

def cpu_usage
  render json: [{name: "CPU", data: @database.cpu_usage(system_params).map { |k, v| [k, v.round] }, library: chart_library_options}]
end

#enable_query_stats ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 294

def enable_query_stats
  @database.enable_query_stats
  redirect_backward notice: "Query stats enabled"
rescue ActiveRecord::StatementInvalid
  redirect_backward alert: "The database user does not have permission to enable query stats"
end

#explain ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 230

def explain
  @title = "Explain"
  @query = params[:query]
  # TODO use get + token instead of post so users can share links
  # need to prevent CSRF and DoS
  if request.post? && @query
    begin
      prefix =
        case params[:commit]
        when "Analyze"
          "ANALYZE "
        when "Visualize"
          "(ANALYZE, COSTS, VERBOSE, BUFFERS, FORMAT JSON) "
        else
          ""
        end
      @explanation = @database.explain("#{prefix}#{@query}")
      @suggested_index = @database.suggested_indexes(queries: [@query]).first if @database.suggested_indexes_enabled?
      @visualize = params[:commit] == "Visualize"
    rescue ActiveRecord::StatementInvalid => e
      @error = e.message
    end
  end
end

#free_space_stats ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 224

def free_space_stats
  render json: [
    {name: "Free Space", data: @database.free_space_stats(duration: 14.days, period: 1.hour).map { |k, v| [k, (v / 1.gigabyte).round] }, library: chart_library_options},
  ]
end

#index ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 21

def index
  @title = "Overview"
  @extended = params[:extended]

  if @replica
    @replication_lag = @database.replication_lag
    @good_replication_lag = @replication_lag < 5
  else
    @inactive_replication_slots = @database.replication_slots.select { |r| !r[:active] }
  end

  @autovacuum_queries, @long_running_queries = @database.long_running_queries.partition { |q| q[:query].starts_with?("autovacuum:") }

  @total_connections = @database.total_connections
  @good_total_connections = @total_connections < @database.total_connections_threshold

  @transaction_id_danger = @database.transaction_id_danger(threshold: 1500000000)

  begin
    @sequence_danger = @database.sequence_danger(threshold: (params[:sequence_threshold] || 0.9).to_f)
  rescue ActiveRecord::StatementInvalid => e
    if (m = /permission denied for [^:]+/.match(e.message))
      @sequence_danger_error = m[0]
    else
      raise
    end
  end

  @indexes = @database.indexes
  @invalid_indexes = @indexes.select { |i| !i[:valid] }
  @duplicate_indexes = @database.duplicate_indexes(indexes: @indexes)

  if @query_stats_enabled
    @query_stats = @database.query_stats(historical: true, start_at: 3.hours.ago)
    @slow_queries = @database.slow_queries(query_stats: @query_stats)
    set_suggested_indexes((params[:min_average_time] || 20).to_f, (params[:min_calls] || 50).to_i)
  else
    @query_stats_available = @database.query_stats_available?
    @query_stats_extension_enabled = @database.query_stats_extension_enabled? if @query_stats_available
    @suggested_indexes = []
  end

  if @extended
    @index_hit_rate = @database.index_hit_rate || 0
    @table_hit_rate = @database.table_hit_rate || 0
    @good_cache_rate = @table_hit_rate >= @database.cache_hit_rate_threshold / 100.0 && @index_hit_rate >= @database.cache_hit_rate_threshold / 100.0
    @unused_indexes = @database.unused_indexes(max_scans: 0)
  end

  @show_migrations = PgHero.show_migrations
end

#index_bloat ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 106

def index_bloat
  @title = "Index Bloat"
  @index_bloat = @database.index_bloat
  @show_sql = params[:sql]
end

#kill ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 276

def kill
  if @database.kill(params[:pid])
    redirect_to root_path, notice: "Query killed"
  else
    redirect_backward notice: "Query no longer running"
  end
end

#kill_all ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 289

def kill_all
  @database.kill_all
  redirect_backward notice: "Connections killed"
end

#kill_long_running_queries ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 284

def kill_long_running_queries
  @database.kill_long_running_queries
  redirect_backward notice: "Queries killed"
end

#live_queries ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 112

def live_queries
  @title = "Live Queries"
  @running_queries = @database.running_queries
end

#load_stats ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 217

def load_stats
  render json: [
    {name: "Read IOPS", data: @database.read_iops_stats(system_params).map { |k, v| [k, v.round] }, library: chart_library_options},
    {name: "Write IOPS", data: @database.write_iops_stats(system_params).map { |k, v| [k, v.round] }, library: chart_library_options}
  ]
end

#maintenance ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 270

def maintenance
  @title = "Maintenance"
  @maintenance_info = @database.maintenance_info
  @time_zone = PgHero.time_zone
end

#queries ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 117

def queries
  @title = "Queries"
  @sort = %w(average_time calls).include?(params[:sort]) ? params[:sort] : nil
  @min_average_time = params[:min_average_time] ? params[:min_average_time].to_i : nil
  @min_calls = params[:min_calls] ? params[:min_calls].to_i : nil

  if @historical_query_stats_enabled
    begin
      @start_at = params[:start_at] ? Time.zone.parse(params[:start_at]) : 24.hours.ago
      @end_at = Time.zone.parse(params[:end_at]) if params[:end_at]
    rescue
      @error = true
    end
  end

  @query_stats =
    if @historical_query_stats_enabled && !request.xhr?
      []
    else
      @database.query_stats(
        historical: true,
        start_at: @start_at,
        end_at: @end_at,
        sort: @sort,
        min_average_time: @min_average_time,
        min_calls: @min_calls
      )
    end

  @indexes = @database.indexes
  set_suggested_indexes

  # fix back button issue with caching
  response.headers["Cache-Control"] = "must-revalidate, no-store, no-cache, private"
  if request.xhr?
    render layout: false, partial: "queries_table", locals: {queries: @query_stats, xhr: true}
  end
end

#relation_space ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 98

def relation_space
  @schema = params[:schema] || "public"
  @relation = params[:relation]
  @title = @relation
  relation_space_stats = @database.relation_space_stats(@relation, schema: @schema)
  @chart_data = [{name: "Value", data: relation_space_stats.map { |r| [r[:captured_at], (r[:size_bytes].to_f / 1.megabyte).round(1)] }, library: chart_library_options}]
end

#replication_lag_stats ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 213

def replication_lag_stats
  render json: [{name: "Lag", data: @database.replication_lag_stats(system_params), library: chart_library_options}]
end

#reset_query_stats ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 301

def reset_query_stats
  @database.reset_query_stats
  redirect_backward notice: "Query stats reset"
rescue ActiveRecord::StatementInvalid
  redirect_backward alert: "The database user does not have permission to reset query stats"
end

#show_query ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 156

def show_query
  @query_hash = params[:query_hash].to_i
  @user = params[:user].to_s
  @title = @query_hash

  stats = @database.query_stats(historical: true, query_hash: @query_hash, start_at: 24.hours.ago).find { |qs| qs[:user] == @user }
  if stats
    @query = stats[:query]
    @explainable_query = stats[:explainable_query]

    if @show_details
      query_hash_stats = @database.query_hash_stats(@query_hash, user: @user)

      @chart_data = [{name: "Value", data: query_hash_stats.map { |r| [r[:captured_at], (r[:total_minutes] * 60 * 1000).round] }, library: chart_library_options}]
      @chart2_data = [{name: "Value", data: query_hash_stats.map { |r| [r[:captured_at], r[:average_time].round(1)] }, library: chart_library_options}]
      @chart3_data = [{name: "Value", data: query_hash_stats.map { |r| [r[:captured_at], r[:calls]] }, library: chart_library_options}]

      @origins = Hash[query_hash_stats.group_by { |r| r[:origin].to_s }.map { |k, v| [k, v.size] }]
      @total_count = query_hash_stats.size
    end

    @tables = PgQuery.parse(@query).tables rescue []
    @tables.sort!

    if @tables.any?
      @row_counts = Hash[@database.table_stats(table: @tables).map { |i| [i[:table], i[:estimated_rows]] }]
      @indexes_by_table = @database.indexes.group_by { |i| i[:table] }
    end
  else
    render_text "Unknown query"
  end
end

#space ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 73

def space
  @title = "Space"
  @days = (params[:days] || 7).to_i
  @database_size = @database.database_size
  @relation_sizes = params[:tables] ? @database.table_sizes : @database.relation_sizes
  @space_stats_enabled = @database.space_stats_enabled? && !params[:tables]
  if @space_stats_enabled
    space_growth = @database.space_growth(days: @days, relation_sizes: @relation_sizes)
    @growth_bytes_by_relation = Hash[ space_growth.map { |r| [[r[:schema], r[:relation]], r[:growth_bytes]] } ]
    case params[:sort]
    when "growth"
      @relation_sizes.sort_by! { |r| s = @growth_bytes_by_relation[[r[:schema], r[:relation]]]; [s ? 0 : 1, -s.to_i, r[:schema], r[:relation]] }
    when "name"
      @relation_sizes.sort_by! { |r| r[:relation] || r[:table] }
    end
  end

  across = params[:across].to_s.split(",")
  @unused_indexes = @database.unused_indexes(max_scans: 0, across: across)
  @unused_index_names = Set.new(@unused_indexes.map { |r| r[:index] })
  @show_migrations = PgHero.show_migrations
  @system_stats_enabled = @database.system_stats_enabled?
  @index_bloat = [] # @database.index_bloat
end

#system ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 189

def system
  @title = "System"
  @periods = {
    "1 hour" => {duration: 1.hour, period: 60.seconds},
    "1 day" => {duration: 1.day, period: 10.minutes},
    "1 week" => {duration: 1.week, period: 30.minutes},
    "2 weeks" => {duration: 2.weeks, period: 1.hours}
  }
  @duration = (params[:duration] || 1.hour).to_i
  @period = (params[:period] || 60.seconds).to_i

  if @duration / @period > 1440
    render_text "Too many data points"
  end
end

#tune ⇒ Object 



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# File 'app/controllers/pg_hero/home_controller.rb', line 255

def tune
  @title = "Tune"
  @settings = @database.settings
  @autovacuum_settings = @database.autovacuum_settings if params[:autovacuum]
end