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require_relative 'batch'
require_relative 'builder'
module InfluxDB
module Query # :nodoc: all
module Core
def builder
@builder ||= Builder.new
end
def ping
url = URI::Generic.build(path: File.join(config.prefix, '/ping')).to_s
get url
end
def version
ping.header['x-influxdb-version']
end
def query( # rubocop:disable Metrics/MethodLength
query,
params: nil,
denormalize: config.denormalize,
chunk_size: config.chunk_size,
**opts
)
query = builder.build(query, params)
url = full_url("/query".freeze, **query_params(query, **opts))
series = fetch_series(get(url, parse: true, json_streaming: !chunk_size.nil?))
if block_given?
series.each do |s|
values = denormalize ? denormalize_series(s) : raw_values(s)
yield s['name'.freeze], s['tags'.freeze], values
end
else
denormalize ? denormalized_series_list(series) : series
end
end
def batch(&block)
Batch.new self, &block
end
# Example:
# write_points([
# {
# series: 'cpu',
# tags: { host: 'server_nl', regios: 'us' },
# values: {internal: 5, external: 6},
# timestamp: 1422568543702900257
# },
# {
# series: 'gpu',
# values: {value: 0.9999},
# }
# ])
def write_points(data, precision = nil, retention_policy = nil, database = nil)
data = data.is_a?(Array) ? data : [data]
payload = generate_payload(data)
writer.write(payload, precision, retention_policy, database)
rescue StandardError => e
raise e unless config.discard_write_errors
log :error, "Cannot write data: #{e.inspect}"
end
# Example:
# write_point('cpu', tags: {region: 'us'}, values: {internal: 60})
def write_point(series, data, precision = nil, retention_policy = nil, database = nil)
write_points(data.merge(series: series), precision, retention_policy, database)
end
def write(data, precision, retention_policy = nil, database = nil)
params = {
db: database || config.database,
precision: precision || config.time_precision,
}
params[:rp] = retention_policy if retention_policy
url = full_url("/write", **params)
post(url, data)
end
private
def query_params(
query,
precision: config.time_precision,
epoch: config.epoch,
chunk_size: config.chunk_size,
database: config.database
)
params = { q: query, db: database }
params[:precision] = precision if precision
params[:epoch] = epoch if epoch
if chunk_size
params[:chunked] = 'true'.freeze
params[:chunk_size] = chunk_size
end
params
end
def denormalized_series_list(series)
series.map do |s|
{
"name".freeze => s["name".freeze],
"tags".freeze => s["tags".freeze],
"values".freeze => denormalize_series(s),
}
end
end
def fetch_series(response)
response.fetch('results'.freeze, []).flat_map do |result|
result.fetch('series'.freeze, [])
end
end
def generate_payload(data)
data.map { |point| generate_point(point) }.join("\n".freeze)
end
def generate_point(point)
InfluxDB::PointValue.new(point).dump
rescue InfluxDB::LineProtocolError => e
(log :error, "Cannot write data: #{e.inspect}") && nil
end
def execute(query, db: nil, **options)
params = { q: query }
params[:db] = db if db
url = full_url("/query".freeze, **params)
get(url, options)
end
def denormalize_series(series)
Array(series["values".freeze]).map do |values|
Hash[series["columns".freeze].zip(values)]
end
end
def raw_values(series)
series.select { |k, _| %w[columns values].include?(k) }
end
def full_url(path, **params)
if config.auth_method == "params".freeze
params[:u] = config.username
params[:p] = config.password
end
URI::Generic.build(
path: File.join(config.prefix, path),
query: cgi_escape_params(params)
).to_s
end
def cgi_escape_params(params)
params.map do |k, v|
[CGI.escape(k.to_s), "=".freeze, CGI.escape(v.to_s)].join
end.join("&".freeze)
end
end
end
end
|
