UM: Policy for deciding download URL.

This adds a new private policy (UpdateDownloadUrl) for determining which
download URL should be used for obtaining the update payload. We further
extend an existing public policy (UpdateCanStart) to return the download
URL details, based on the current URL index and the number of failures
associated with it. This renders the explicit notion of "HTTP download
allowed" in the return value unnecessary: If HTTP is not allowed, then
HTTP URLs will not be considered.

We also implement logic for logging the start/end of a policy
evaluation, so that intermediate log messages emitted during evaluation
have a clear context.

BUG=chromium:358329
TEST=Unit tests.

Change-Id: Ib5343417480d8825082f83bed2630a6611360b61
Reviewed-on: https://chromium-review.googlesource.com/203373
Tested-by: Gilad Arnold <garnold@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Gilad Arnold <garnold@chromium.org>
7 files changed
tree: 2e650384ba213f4cdaa75faca82c549d97a04104
  1. init/
  2. payload_generator/
  3. update_manager/
  4. .gitignore
  5. action.h
  6. action_mock.h
  7. action_pipe.h
  8. action_pipe_unittest.cc
  9. action_processor.cc
  10. action_processor.h
  11. action_processor_mock.h
  12. action_processor_unittest.cc
  13. action_unittest.cc
  14. build
  15. bzip.cc
  16. bzip.h
  17. bzip_extent_writer.cc
  18. bzip_extent_writer.h
  19. bzip_extent_writer_unittest.cc
  20. certificate_checker.cc
  21. certificate_checker.h
  22. certificate_checker_mock.h
  23. certificate_checker_unittest.cc
  24. chrome_browser_proxy_resolver.cc
  25. chrome_browser_proxy_resolver.h
  26. chrome_browser_proxy_resolver_unittest.cc
  27. clock.cc
  28. clock.h
  29. clock_interface.h
  30. connection_manager.cc
  31. connection_manager.h
  32. connection_manager_unittest.cc
  33. constants.cc
  34. constants.h
  35. dbus_constants.h
  36. dbus_service.cc
  37. dbus_service.h
  38. dbus_wrapper_interface.h
  39. delta_performer.cc
  40. delta_performer.h
  41. delta_performer_unittest.cc
  42. download_action.cc
  43. download_action.h
  44. download_action_unittest.cc
  45. error_code.h
  46. extent_ranges.cc
  47. extent_ranges.h
  48. extent_ranges_unittest.cc
  49. extent_writer.cc
  50. extent_writer.h
  51. extent_writer_unittest.cc
  52. fake_clock.h
  53. fake_hardware.h
  54. fake_p2p_manager.h
  55. fake_p2p_manager_configuration.h
  56. fake_prefs.cc
  57. fake_prefs.h
  58. fake_system_state.cc
  59. fake_system_state.h
  60. file_descriptor.cc
  61. file_descriptor.h
  62. file_writer.cc
  63. file_writer.h
  64. file_writer_mock.h
  65. file_writer_unittest.cc
  66. filesystem_copier_action.cc
  67. filesystem_copier_action.h
  68. filesystem_copier_action_unittest.cc
  69. gen_coverage_html
  70. hardware.cc
  71. hardware.h
  72. hardware_interface.h
  73. http_common.cc
  74. http_common.h
  75. http_fetcher.cc
  76. http_fetcher.h
  77. http_fetcher_unittest.cc
  78. hwid_override.cc
  79. hwid_override.h
  80. hwid_override_unittest.cc
  81. inherit-review-settings-ok
  82. install_plan.cc
  83. install_plan.h
  84. libcurl_http_fetcher.cc
  85. libcurl_http_fetcher.h
  86. LICENSE
  87. local_coverage_rate
  88. main.cc
  89. metrics.cc
  90. metrics.h
  91. mock_connection_manager.h
  92. mock_dbus_wrapper.h
  93. mock_file_writer.h
  94. mock_hardware.h
  95. mock_http_fetcher.cc
  96. mock_http_fetcher.h
  97. mock_p2p_manager.h
  98. mock_payload_state.h
  99. multi_range_http_fetcher.cc
  100. multi_range_http_fetcher.h
  101. omaha_hash_calculator.cc
  102. omaha_hash_calculator.h
  103. omaha_hash_calculator_unittest.cc
  104. omaha_request_action.cc
  105. omaha_request_action.h
  106. omaha_request_action_unittest.cc
  107. omaha_request_params.cc
  108. omaha_request_params.h
  109. omaha_request_params_unittest.cc
  110. omaha_response.h
  111. omaha_response_handler_action.cc
  112. omaha_response_handler_action.h
  113. omaha_response_handler_action_unittest.cc
  114. p2p_manager.cc
  115. p2p_manager.h
  116. p2p_manager_unittest.cc
  117. payload_constants.cc
  118. payload_constants.h
  119. payload_signer.cc
  120. payload_signer.h
  121. payload_signer_unittest.cc
  122. payload_state.cc
  123. payload_state.h
  124. payload_state_interface.h
  125. payload_state_unittest.cc
  126. postinstall_runner_action.cc
  127. postinstall_runner_action.h
  128. postinstall_runner_action_unittest.cc
  129. prefs.cc
  130. prefs.h
  131. prefs_interface.h
  132. prefs_mock.h
  133. prefs_unittest.cc
  134. proxy_resolver.cc
  135. proxy_resolver.h
  136. real_dbus_wrapper.h
  137. real_system_state.cc
  138. real_system_state.h
  139. run_unittests
  140. sample_omaha_v3_response.xml
  141. SConstruct
  142. simple_key_value_store.cc
  143. simple_key_value_store.h
  144. simple_key_value_store_unittest.cc
  145. subprocess.cc
  146. subprocess.h
  147. subprocess_unittest.cc
  148. system_state.h
  149. terminator.cc
  150. terminator.h
  151. terminator_unittest.cc
  152. test_http_server.cc
  153. test_utils.cc
  154. test_utils.h
  155. testrunner.cc
  156. unittest_key.pem
  157. unittest_key2.pem
  158. update_attempter.cc
  159. update_attempter.h
  160. update_attempter_mock.h
  161. update_attempter_unittest.cc
  162. update_check_scheduler.cc
  163. update_check_scheduler.h
  164. update_check_scheduler_unittest.cc
  165. update_engine.xml
  166. update_engine_client.cc
  167. update_metadata.proto
  168. UpdateEngine.conf
  169. utils.cc
  170. utils.h
  171. utils_unittest.cc
  172. WATCHLISTS
  173. zip_unittest.cc