Module: Google::Cloud::Trace::LabelKey

Defined in:
lib/google/cloud/trace/label_key.rb

Overview

A collection of well-known label keys for trace spans.

Constant Summary collapse

AGENT = 
"/agent"
COMPONENT = 
"/component"
ERROR_MESSAGE = 
"/error/message"
ERROR_NAME = 
"/error/name"
HTTP_CLIENT_CITY = 
"/http/client_city"
HTTP_CLIENT_COUNTRY = 
"/http/client_country"
HTTP_CLIENT_PROTOCOL = 
"/http/client_protocol"
HTTP_CLIENT_REGION = 
"/http/client_region"
HTTP_HOST = 
"/http/host"
HTTP_METHOD = 
"/http/method"
HTTP_REDIRECTED_URL = 
"/http/redirected_url"
HTTP_REQUEST_SIZE = 
"/http/request/size"
HTTP_RESPONSE_SIZE = 
"/http/response/size"
HTTP_STATUS_CODE = 
"/http/status_code"
HTTP_URL = 
"/http/url"
HTTP_USER_AGENT = 
"/http/user_agent"
PID = 
"/pid"
STACKTRACE = 
"/stacktrace"
TID = 
"/tid"
GAE_APPLICATION_ERROR = 
"g.co/gae/application_error"
GAE_APP_MODULE = 
"g.co/gae/app/module"
GAE_APP_MODULE_VERSION = 
"g.co/gae/app/module_version"
GAE_APP_VERSION = 
"g.co/gae/app/version"
GAE_DATASTORE_COUNT = 
"g.co/gae/datastore/count"
GAE_DATASTORE_CURSOR = 
"g.co/gae/datastore/cursor"
GAE_DATASTORE_ENTITY_WRITES = 
"g.co/gae/datastore/entity_writes"
GAE_DATASTORE_HAS_ANCESTOR = 
"g.co/gae/datastore/has_ancestor"
GAE_DATASTORE_HAS_CURSOR = 
"g.co/gae/datastore/has_cursor"
GAE_DATASTORE_HAS_TRANSACTION = 
"g.co/gae/datastore/has_transaction"
GAE_DATASTORE_INDEX_WRITES = 
"g.co/gae/datastore/index_writes"
GAE_DATASTORE_KIND = 
"g.co/gae/datastore/kind"
GAE_DATASTORE_LIMIT = 
"g.co/gae/datastore/limit"
GAE_DATASTORE_MORE_RESULTS = 
"g.co/gae/datastore/more_results"
GAE_DATASTORE_OFFSET = 
"g.co/gae/datastore/offset"
GAE_DATASTORE_REQUESTED_ENTITY_DELETES = 
"g.co/gae/datastore/requested_entity_deletes"
GAE_DATASTORE_REQUESTED_ENTITY_PUTS = 
"g.co/gae/datastore/requested_entity_puts"
GAE_DATASTORE_SIZE = 
"g.co/gae/datastore/size"
GAE_DATASTORE_SKIPPED = 
"g.co/gae/datastore/skipped"
GAE_DATASTORE_TRANSACTION_HANDLE = 
"g.co/gae/datastore/transaction_handle"
GAE_ERROR_MESSAGE = 
"g.co/gae/error_message"
GAE_MEMCACHE_COUNT = 
"g.co/gae/memcache/count"
GAE_MEMCACHE_SIZE = 
"g.co/gae/memcache/size"
GAE_REQUEST_LOG_ID = 
"g.co/gae/request_log_id"
RPC_REQUEST_SIZE = 
"/rpc/request/size"
RPC_RESPONSE_SIZE = 
"/rpc/response/size"

Class Method Summary collapse

Class Method Details

.set_stack_trace(labels, stack_frames: nil, skip_frames: 1, truncate_stack: nil, filter_stack: nil) ⇒ Object

Set the stack trace label in the given labels hash. The current call stack is formatted so the Stackdriver UI will display it.

Examples:

require "google/cloud/trace"

trace = Google::Cloud::Trace.new
span = trace.create_span "root_span"
Google::Cloud::Trace::LabelKey.set_stack_trace span.labels

Parameters:

  • labels (Hash) —

    The labels hash in which to set the stack trace label value.

  • stack_frames (Array<Thread::Backtrace::Location>) —

    The current caller stack as returned from ::Kernel.caller_locations. If not set, ::Kernel.caller_locations is called internally.

  • skip_frames (Integer) —

    Passed to the internal invocation of ::Kernel.caller_locations if one is needed.

  • truncate_stack (Proc) —

    A procedure that allows skipping of the "topmost" stack frames. Stack frames, represented by instances of Thread::Backtrace::Location, are passed to this proc beginning with the topmost frame. As long as the proc returns a falsy value, those frames are dropped. Once the proc returns true for the first time, that frame and all remaining frames (possibly subject to filter_stack) are used. If not set, no frames are skipped.

  • filter_stack (Proc) —

    A procedure that allows skipping of stack frames in the middle of the stack trace. After possibly skipping frames using truncate_stack, all remaining frames are passed to this proc as Thread::Backtrace::Location objects. Those for whom the proc returns a falsy value are skipped. If this parameter is not set, no filtering is done and all frames are presented in the stack trace.



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# File 'lib/google/cloud/trace/label_key.rb', line 110

def self.set_stack_trace labels,
                         stack_frames: nil, skip_frames: 1,
                         truncate_stack: nil, filter_stack: nil
  stack_frames ||= ::Kernel.caller_locations skip_frames
  json_frames = []
  collecting_frames = !truncate_stack
  stack_frames.each do |frame|
    collecting_frames ||= truncate_stack.call(frame)
    next unless collecting_frames
    next unless !filter_stack || filter_stack.call(frame)
    json_frames <<
      {
        file_name: frame.absolute_path,
        line_number: frame.lineno,
        method_name: frame.label
      }
  end
  json_object = { stack_frame: json_frames }
  labels[STACKTRACE] = JSON.generate json_object
end