Class: ICFS::CacheElastic

Inherits:
Cache
  • Object
show all
Includes:
Elastic
Defined in:
lib/icfs/cache_elastic.rb

Overview

Implements Cache using Elasticsearch

Constant Summary collapse

ResultsCase =

the Case results fields

{
  caseid: 'caseid',
  template: 'template',
  status: 'status',
  title: 'title',
  tags: 'tags',
}.freeze
DefaultSize =

default page size

25
ResultsEntry =

Entry search results fields

{
  caseid: 'caseid',
  entry: 'entry',
  time: 'time',
  title: 'title',
  tags: 'tags',
  perms: ['perms', :empty],
  action: ['action', :zero],
  indexes: ['index', :size],
  files: ['files', :size],
  stats: ['stats', :size],
}.freeze
ResultsIndex =

Index search results fields

{
  caseid: 'caseid',
  index: 'index',
  title: 'title',
  tags: 'tags',
}.freeze
ResultsLog =

Log search results fields

{
  caseid: 'caseid',
  log: 'log',
  time: 'time',
  user: 'user',
  entry: ['entry', :sub, 'num'].freeze,
  index: ['index', :sub, 'num'].freeze,
  action: ['action', :sub, 'num'].freeze,
  case: ['case', :sub, 'set'].freeze,
  files: ['files_hash', :size].freeze,
}.freeze

Instance Method Summary collapse

Methods included from Elastic

#create

Methods inherited from Cache

#supports

Constructor Details

#initialize(map, es) ⇒ CacheElastic

New instance

Parameters:

  • map (Hash) —

    Symbol to String of the indexes. Must provide :case, :log, :entry, :action, :current, and :lock

  • es (Faraday) —

    Faraday instance to the Elasticsearch cluster



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# File 'lib/icfs/cache_elastic.rb', line 163

def initialize(map, es)
  @map = map
  @es = es
  @name = '%s:%d' % [Socket.gethostname, Process.pid]
  @name.freeze
end

Instance Method Details

#_agg_filter(name, qu, sub) ⇒ Object

filter bucket aggregation



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# File 'lib/icfs/cache_elastic.rb', line 872

def _agg_filter(name, qu, sub)
  ag = { name => { 'filter' => qu } }
  ag[name]['aggs'] = sub if sub
  return ag
end

#_agg_nested(name, field, sub) ⇒ Object

nested bucket aggregation



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# File 'lib/icfs/cache_elastic.rb', line 882

def _agg_nested(name, field, sub)
  ag = { name => { 'nested' => { 'path' => field } } }
  ag[name]['aggs'] = sub if sub
  return ag
end

#_agg_stats(name, field) ⇒ Object

stats metric aggregation



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# File 'lib/icfs/cache_elastic.rb', line 854

def _agg_stats(name, field)
  { name => { 'stats' => { 'field' => field } } }
end

#_agg_terms(name, field, sub) ⇒ Object

terms bucket aggregation



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# File 'lib/icfs/cache_elastic.rb', line 862

def _agg_terms(name, field, sub)
  ag = { name => { 'terms' => { 'field' => field } } }
  ag[name]['aggs'] = sub if sub
  return ag
end

#_query_all ⇒ Object

match all query



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# File 'lib/icfs/cache_elastic.rb', line 256

def _query_all()
  { 'match_all' => {} }
end

#_query_bool(must, filter, should, must_not) ⇒ Object

bool query



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# File 'lib/icfs/cache_elastic.rb', line 941

def _query_bool(must, filter, should, must_not)
  qu = {}
  qu['must'] = must if(must && !must.empty?)
  qu['filter'] = filter if(filter && !filter.empty?)
  qu['should'] = should if(should && !should.empty?)
  qu['must_not'] = must_not if(must_not && !must_not.empty?)
  if qu.empty?
    return { 'match_all' => {} }
  else
    return { 'bool' => qu }
  end
end

#_query_constant(filter) ⇒ Object

constant score



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# File 'lib/icfs/cache_elastic.rb', line 1020

def _query_constant(filter)
  {'constant_score' => { 'filter' => filter } }
end

#_query_exists(field, val) ⇒ Object

Exists query



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# File 'lib/icfs/cache_elastic.rb', line 901

def _query_exists(field, val)
  return nil if val.nil?
  { 'exists' => { 'field' => field } }
end

#_query_keyw(field, val) ⇒ Object

keyword query



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# File 'lib/icfs/cache_elastic.rb', line 909

def _query_keyw(field, val)
  return nil if val.nil?
  if val.is_a?(Array)
    qu = { 'terms' => { field => val } }
  else
    qu = {'term' => { field => val } }
  end
  return qu
end

#_query_match(field, val) ⇒ Object

match query



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# File 'lib/icfs/cache_elastic.rb', line 247

def _query_match(field, val)
  return nil if !val
  { 'match' => { field => { 'query' => val } } }
end

#_query_nested(field, query) ⇒ Object

Nested query



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# File 'lib/icfs/cache_elastic.rb', line 454

def _query_nested(field, query)
  {
    'nested' => {
      'path' => field,
      'query' => query
    }
  }
end

#_query_prefix(field, val) ⇒ Object

prefix string query



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# File 'lib/icfs/cache_elastic.rb', line 933

def _query_prefix(field, val)
  return nil if val.nil?
  return { 'prefix' => { field => val } }
end

#_query_term(field, val) ⇒ Object

Term query



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# File 'lib/icfs/cache_elastic.rb', line 892

def _query_term(field, val)
  return nil if val.nil?
  { 'term' => { field => val } }
end

#_query_times(field, val_gt, val_lt) ⇒ Object

times query



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# File 'lib/icfs/cache_elastic.rb', line 922

def _query_times(field, val_gt, val_lt)
  return nil if( val_gt.nil? && val_lt.nil? )
  tq = {}
  tq['gt'] = val_gt if val_gt
  tq['lt'] = val_lt if val_lt
  return {'range' => { field => tq } }
end

#action_read(cid, anum) ⇒ String

Read an action

Parameters:

  • cid (String) —

    caseid

  • anum (Integer) —

    the action number

Returns:

  • (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 551

def action_read(cid, anum)
  _read(:action, '%s.%d' % [cid, anum])
end

#action_search(query) ⇒ Object

Search for actions

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 567

def action_search(query)

  # build the query
  task_must = [
    _query_match('tasks.title', query[:title])
  ].compact
  task_filter = [
    _query_term('tasks.assigned', query[:assigned]),
    _query_term('tasks.status', query[:status]),
    _query_term('tasks.flag', query[:flag]),
    _query_times('tasks.time', query[:after], query[:before]),
    _query_term('tasks.tags', query[:tags]),
  ].compact
  must = [
    _query_nested(
      'tasks',
      _query_bool(task_must, task_filter, nil, nil)
    )
  ]
  filter = [
    _query_term('caseid', query[:caseid])
  ].compact
  req = { 'query' => _query_bool(must, filter, nil, nil) }

  # sort
  case query[:sort]
  when 'time_desc'
    srt = 'desc'
  when 'time_asc'
    srt = 'asc'
  else
    srt = query[:title] ? nil : 'desc'
  end
  if srt
    req['sort'] = [
      {
        'tasks.time' => {
          'order' => srt,
          'nested' => {
            'path' => 'tasks',
            'filter' => _query_term(
              'tasks.assigned', query[:assigned])
          }
        }
      },
      { '_id' => { 'order' => 'desc' } }
    ]
  end

  # paging
  _page(query, req)

  # run the search
  url = @map[:action] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  return _results(resp, query) do |src|
    tsk = src['tasks'].select{|tk| tk['assigned'] == query[:assigned]}.first
    {
      caseid: src['caseid'],
      action: src['action'],
      status: tsk['status'],
      flag: tsk['flag'],
      title: tsk['title'],
      time: tsk['time'],
      tags: tsk['tags'],
    }
  end
end

#action_tags(query) ⇒ Object

List tags used on action tasks

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 1122

def action_tags(query)

  # build the query
  task_filter = [
    _query_term('tasks.assigned', query[:assigned]),
    _query_term('tasks.status', query[:status]),
    _query_term('tasks.flag', query[:flag]),
    _query_times('tasks.time', query[:after], query[:before]),
  ].compact
  qu_filt = _query_bool(nil, task_filter, nil, nil)
  ag = _agg_terms('tags', 'tasks.tags', nil)
  ag = _agg_filter('filt', qu_filt, ag)
  ag = _agg_nested('nest', 'tasks', ag)
  if query[:caseid]
    qu = _query_term('caseid', query[:caseid])
  else
    qu = _query_all()
  end
  req = {
    'query' => qu,
    'aggs' => ag,
    'size' => 0
  }

  # run the search
  url = @map[:action] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  # extract tags
  rh = JSON.parse(resp.body)
  rh = rh['aggregations']['nest']['filt']['tags']['buckets']
  list =  rh.map do |hh|
    {
      object: {
        tag: hh['key'],
        count: hh['doc_count'],
      }
    }
  end

  return {
    query: query,
    list: list.sort{|aa, bb| aa[:object][:tag] <=> bb[:object][:tag]}
  }
end

#action_write(cid, anum, item) ⇒ Object

Write an action

Parameters:

  • cid (String) —

    caseid

  • anum (Integer) —

    the action number

  • item (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 559

def action_write(cid, anum, item)
  _write(:action, '%s.%d' % [cid, anum], item)
end

#case_read(cid) ⇒ String

Read a case

Parameters:

  • cid (String) —

    caseid

Returns:

  • (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 231

def case_read(cid)
  _read(:case, cid)
end

#case_search(query) ⇒ Object

Search for cases

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 264

def case_search(query)

  # build the query
  must = [
    _query_match('title', query[:title]),
  ].compact
  filter = [
    _query_term('tags', query[:tags]),
    _query_term('status', query[:status]),
    _query_term('template', query[:template]),
  ].compact
  access = [
    _query_term('access.grant', query[:grantee]),
    _query_term('access.perm', query[:perm]),
  ].compact
  unless access.empty?
    qu = (access.size == 1) ? access[0] : _query_bool(nil, access, nil, nil)
    filter << _query_nested('access', qu)
  end
  req = { 'query' => _query_bool(must, filter, nil, nil) }

  # highlight
  hl = {}
  hl['title'] = {} if query[:title]
  req['highlight'] = { 'fields' => hl } unless hl.empty?

  # sort
  unless query[:title]
    req['sort'] = { 'caseid' => 'asc' }
  end

  # paging
  _page(query, req)

  # run the search
  url = @map[:case] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  return _results(resp, query, ResultsCase)
end

#case_tags(query) ⇒ Object

Get list of tags for cases

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 1070

def case_tags(query)

  # build the query
  filter = [
    _query_term('status', query[:status]),
    _query_term('template', query[:template]),
  ].compact
  access = [
    _query_term('access.grant', query[:grantee]),
    _query_term('access.perm', query[:perm]),
  ].compact
  unless access.empty?
    qu = (access.size == 1) ? access[0] : _query_bool(nil, access, nil, nil)
    filter << _query_nested('access', qu)
  end
  qu = _query_bool(nil, filter, nil, nil)
  ag = _agg_terms('tags', 'tags', nil)
  req = {
    'query' => qu,
    'aggs' => ag,
    'size' => 0
  }

  # run the search
  url = @map[:case] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  # extract tags
  rh = JSON.parse(resp.body)
  rh = rh['aggregations']['tags']['buckets']
  list = rh.map do |hh|
    {
      object: {
        tag: hh['key'],
        count: hh['doc_count'],
      }
    }
  end

  return {
    query: query,
    list: list.sort{|aa, bb| aa[:object][:tag] <=> bb[:object][:tag] }
  }
end

#case_write(cid, item) ⇒ Object

Write a case

Parameters:

  • cid (String) —

    caseid

  • item (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 239

def case_write(cid, item)
  _write(:case, cid, item)
end

#current_read(cid) ⇒ String

Read current

Parameters:

  • cid (String) —

    caseid

Returns:

  • (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 215

def current_read(cid)
  _read(:current, cid)
end

#current_write(cid, item) ⇒ Object

Write current

Parameters:

  • cid (String) —

    caseid

  • item (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 223

def current_write(cid, item)
  _write(:current, cid, item)
end

#entry_read(cid, enum) ⇒ String

Read an entry

Parameters:

  • cid (String) —

    caseid

  • enum (Integer) —

    the entry number

Returns:

  • (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 438

def entry_read(cid, enum)
  _read(:entry, '%s.%d' % [cid, enum])
end

#entry_search(query) ⇒ Object

Search for entries

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 467

def entry_search(query)

  # build the query
  must = [
    _query_match('title', query[:title]),
    _query_match('content', query[:content]),
  ].compact
  filter = [
    _query_term('tags', query[:tags]),
    _query_term('caseid', query[:caseid]),
    _query_times('time', query[:after], query[:before]),
    _query_term('action', query[:action]),
    _query_term('index', query[:index]),
  ].compact
  stats = [
    _query_term('stats.name', query[:stat]),
    _query_term('stats.credit', query[:credit]),
  ].compact
  unless stats.empty?
    qu = (stats.size == 1) ? stats[0] : _query_bool(nil, stats, nil, nil)
    filter << _query_nested('stats', qu)
  end
  req = { 'query' => _query_bool(must, filter, nil, nil) }

  # highlight
  hl = {}
  hl['title'] = {} if query[:title]
  hl['content'] = {} if query[:content]
  req['highlight'] = { 'fields' => hl } unless hl.empty?

  # sort
  case query[:sort]
  when 'time_desc'
    req['sort'] = [
      { 'time' => 'desc' },
      { '_id' => 'desc' },
    ]
  when 'time_asc'
    req['sort'] = [
      { 'time' => 'asc' },
      { '_id' => 'desc' },
    ]
  when nil
    if !query[:title] && !query[:content]
     req['sort'] = [
        { 'time' => 'desc' },
        { '_id' => 'desc' },
      ]
    end
  end

  # paging
  _page(query, req)

  # run the search
  url = @map[:entry] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  return _results(resp, query, ResultsEntry)
end

#entry_tags(query) ⇒ Object

List tags used on Entries

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 1028

def entry_tags(query)

  # build the query
  ag = _agg_terms('tags', 'tags', nil)
  qu = _query_term('caseid', query[:caseid])
  qu = _query_constant(qu)
  req = {
    'query' => qu,
    'aggs' => ag,
    'size' => 0
  }

  # run the search
  url = @map[:entry] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  # extract tags
  rh = JSON.parse(resp.body)
  rh = rh['aggregations']['tags']['buckets']
  list = rh.map do |hh|
    {
      object: {
        caseid: query[:caseid],
        tag: hh['key'],
        count: hh['doc_count'],
      }
    }
  end

  return {
    query: query,
    list: list.sort{|aa, bb| aa[:object][:tag] <=> bb[:object][:tag]}
  }
end

#entry_write(cid, enum, item) ⇒ Object

Write an entry

Parameters:

  • cid (String) —

    caseid

  • enum (Integer) —

    the entry number

  • item (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 446

def entry_write(cid, enum, item)
  _write(:entry, '%s.%d' % [cid, enum], item)
end

#index_read(cid, xnum) ⇒ String

Read an Index

Parameters:

  • cid (String) —

    caseid

  • xnum (Integer) —

    the index number

Returns:

  • (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 652

def index_read(cid, xnum)
  _read(:index, '%s.%d' % [cid, xnum])
end

#index_search(query) ⇒ Object

Search for Indexes

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 659

def index_search(query)

  # build the query
  must = [
    _query_match('title', query[:title]),
    _query_match('content', query[:content]),
  ].compact
  filter = [
    _query_term('caseid', query[:caseid]),
    _query_term('tags', query[:tags]),
    _query_prefix('title.raw', query[:prefix]),
  ].compact
  req = { 'query' => _query_bool(must, filter, nil, nil) }

  # highlight
  hl = {}
  hl['title'] = {} if query[:title]
  hl['content'] = {} if query[:content]
  req['highlight'] = { 'fields' => hl } unless hl.empty?

  # sort
  case query[:sort]
  when 'index_asc'
    req['sort'] = [
      { 'index' => 'asc' },
      { '_id' => 'desc' },
    ]
  when 'index_desc'
    req['sort'] = [
      { 'index' => 'desc' },
      { '_id' => 'desc' },
    ]
  when 'title_desc'
    req['sort'] = [
      { 'title.raw' => 'desc' },
      { '_id' => 'desc' },
    ]
  when 'title_asc'
    req['sort'] = [
      { 'title.raw' => 'asc' },
      { '_id' => 'desc' },
    ]
  else
    # default if not a title/content query
    if must.empty?
      req['sort'] = [
        { 'title.raw' => 'asc' },
        { '_id' => 'desc' },
      ]
    end
  end

  # paging
  _page(query, req)

  # run the search
  url = @map[:index] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  return _results(resp, query, ResultsIndex)
end

#index_tags(query) ⇒ Object

List tags used in indexes

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 737

def index_tags(query)

  # build the query
  ag = _agg_terms('tags', 'tags', nil)
  qu = _query_term('caseid', query[:caseid])
  qu = _query_constant(qu)
  req = {
    'query' => qu,
    'aggs' => ag,
    'size' => 0
  }

  # run the search
  url = @map[:index] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  # extract tags
  rh = JSON.parse(resp.body)
  rh = rh['aggregations']['tags']['buckets']
  list = rh.map do |hh|
    {
      object: {
        caseid: query[:caseid],
        tag: hh['key'],
        count: hh['doc_count'],
      }
    }
  end

  return {
    query: query,
    list: list.sort{|aa, bb| aa[:object][:tag] <=> bb[:object][:tag]}
  }
end

#index_write(cid, xnum, item) ⇒ Object

Write an Index

Parameters:

  • cid (String) —

    caseid

  • xnum (Integer) —

    the index number

  • item (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 644

def index_write(cid, xnum, item)
  _write(:index, '%s.%d' % [cid, xnum], item)
end

#lock_release(cid) ⇒ Object

Release a case lock

Parameters:

  • cid (String) —

    caseid



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# File 'lib/icfs/cache_elastic.rb', line 203

def lock_release(cid)
  url = '%s/_doc/%s' % [@map[:lock], CGI.escape(cid)]
  resp = @es.run_request(:delete, url, '', {})
  if !resp.success?
    raise('Elasticsearch lock release failed: %s' % cid)
  end
end

#lock_take(cid) ⇒ Object

Take a case lock

Parameters:

  • cid (String) —

    caseid



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# File 'lib/icfs/cache_elastic.rb', line 180

def lock_take(cid)

  json = '{"client":"%s"}' % @name
  url = '%s/_doc/%s/_create' % [@map[:lock], CGI.escape(cid)]
  head = {'Content-Type' => 'application/json'}.freeze

  # try to take
  tries = 5
  while tries > 0
    resp = @es.run_request(:put, url, json, head)
    return true if resp.success?
    tries = tries - 1
    sleep(0.1)
  end

  # failed to take lock
  raise('Elasticsearch lock take failed: %s' % cid)
end

#log_read(cid, lnum) ⇒ String

Read a log

Parameters:

  • cid (String) —

    caseid

  • lnum (Integer) —

    the log number

Returns:

  • (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 779

def log_read(cid, lnum)
  _read(:log, '%s.%d' % [cid, lnum])
end

#log_search(query) ⇒ Object

Search for a log

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 809

def log_search(query)

  # build the query
  filter = [
    _query_term('caseid', query[:caseid]),
    _query_times('times', query[:after], query[:before]),
    _query_term('user', query[:user]),
    _query_exists('case.set', query[:case_edit]),
    _query_term('entry.num', query[:entry]),
    _query_term('index.num', query[:index]),
    _query_term('action.num', query[:action]),
  ].compact
  req = { 'query' => _query_bool(nil, filter, nil, nil) }

  # sort
  case query[:sort]
  when 'time_desc', nil
    req['sort'] = [
      { 'time' => 'desc' },
      { '_id' => 'desc' },
    ]
  when 'time_asc'
    req['sort'] = [
      { 'time' => 'asc' },
      { '_id' => 'desc' },
    ]
  end

  # paging
  _page(query, req)

  # run the search
  url = @map[:log] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  return _results(resp, query, ResultsLog)
end

#log_write(cid, lnum, item) ⇒ Object

Write a log

Parameters:

  • cid (String) —

    caseid

  • lnum (Integer) —

    the log number

  • item (String) —

    JSON encoded item



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# File 'lib/icfs/cache_elastic.rb', line 787

def log_write(cid, lnum, item)
  _write(:log, '%s.%d' % [cid, lnum], item)
end

#stats(query) ⇒ Object

Analyze stats

Parameters:

  • query (Hash) —

    the query



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# File 'lib/icfs/cache_elastic.rb', line 958

def stats(query)

  # aggs
  ag = _agg_stats('vals', 'stats.value')
  ag = _agg_terms('stats', 'stats.name', ag)
  if query[:credit]
    cd = _query_term('stats.credit', query[:credit])
    ag = _agg_filter('credit', cd, ag)
  end
  ag = _agg_nested('nested', 'stats', ag)

  # build the query
  filt = [
    _query_term('caseid', query[:caseid]),
    _query_times('time', query[:after], query[:before]),
  ].compact
  qu = _query_bool(nil, filt, nil, nil)

  # the request
  req = {
    'query' => qu,
    'aggs' => ag,
    'size' => 0,
  }

  # run the search
  url = @map[:entry] + '/_search'
  body = JSON.generate(req)
  head = { 'Content-Type' => 'application/json' }
  resp = @es.run_request(:get, url, body, head)
  raise 'search failed' if !resp.success?

  # extract stats
  rh = JSON.parse(resp.body)
  if query[:credit]
    rh = rh['aggregations']['nested']['credit']['stats']['buckets']
  else
    rh = rh['aggregations']['nested']['stats']['buckets']
  end
  list = rh.map do |hh|
    {
      object: {
        stat: hh['key'],
        sum: hh['vals']['sum'],
        count: hh['vals']['count'],
        min: hh['vals']['min'],
        max: hh['vals']['max'],
      }
    }
  end

  # return the results
  return {
    query: query,
    list: list
  }
end