Bug Fixes:
* Fix restore --force acting like --force --delta. This caused restore to replace files based on timestamp and size rather than overwriting, which meant some files that should have been updated were left unchanged. Normal restore and restore --delta were not affected by this issue. (Reviewed by Cynthia Shang.)
Features:
* Azure support for repository storage. (Reviewed by Cynthia Shang, Don Seiler.)
* Add expire-auto option. This allows automatic expiration after a successful backup to be disabled. (Contributed by Stefan Fercot. Reviewed by Cynthia Shang, David Steele.)
Improvements:
* Asynchronous S3 multipart upload. (Reviewed by Stephen Frost.)
* Automatic retry for backup, restore, archive-get, and archive-push. (Reviewed by Cynthia Shang.)
* Disable query parallelism in PostgreSQL sessions used for backup control. (Reviewed by Stefan Fercot.)
* PostgreSQL 13 beta2 support. Changes to the control/catalog/WAL versions in subsequent betas may break compatibility but pgBackRest will be updated with each release to keep pace.
* Improve handling of invalid HTTP response status. (Reviewed by Cynthia Shang.)
* Improve error when pg1-path option missing for archive-get command. (Reviewed by Cynthia Shang.)
* Add hint when checksum delta is enabled after a timeline switch. (Reviewed by Matt Bunter, Cynthia Shang.)
* Use PostgreSQL instead of postmaster where appropriate. (Reviewed by Cynthia Shang.)
Documentation Bug Fixes:
* Fix incorrect example for repo-retention-full-type option. (Reported by Höseyin Sönmez.)
* Remove internal commands from HTML and man command references. (Reported by Cynthia Shang.)
Documentation Improvements:
* Update PostgreSQL versions used to build user guides. Also add version ranges to indicate that a user guide is accurate for a range of PostgreSQL versions even if it was built for a specific version. (Reviewed by Stephen Frost.)
* Update FAQ for expiring a specific backup set. (Contributed by Cynthia Shang. Reviewed by David Steele.)
* Update FAQ to clarify default PITR behavior. (Contributed by Cynthia Shang. Reviewed by David Steele.)
The postgresql.auto.conf file was being used instead of recovery.conf, but there were still instances in the text that used recovery.conf. Update to postgresql.auto.conf for PostgreSQL >= 10 and change wording where needed.
Remove all check and stanza-* tests except for the ones that are intended to succeed. The successful tests show that the queries run with expected results against each version of PG which should also validate queries for the failure tests in the unit tests.
Also remove the tests for --no-online backups since they don't require a database and are well tested in the unit tests.
The prior code was only able to use the main passphrase automatically and expected sub passphrases to be specified for each operation. This was fine for testing but hardly sufficient for a user-facing feature.
Update the code to determine which passphrase to use for any file in the repository and error when an invalid file or location is selected.
The repo-get command is still internal for now, but with this improvement it should be ready to be made public.
There are a few non version specific tests that need to be run in integration because we can't get coverage in the unit tests.
To save some time we'll only run those tests against the same version we use for expect testing.
If a local command, e.g. backupFile(), fails it will stop the entire process. Instead, retry local commands to deal with transient errors.
Remove special logic in the S3 storage driver to retry RequestTimeTooSkewed errors since this is now handled by the general retry mechanism in the places where it is most likely to happen, i.e. file read/write. Also, this error should have been entirely eliminated by the asynchronous TLS implementation.
The Azure storage driver exposes secrets in the query when using SAS authorization. These secrets can show up during logging or when an error occurs.
Allow redaction of queries to prevent secrets from being exposed in logs and errors.
A shared access signature (SAS) provides granular, delegated access to resources in a storage account. This is often preferable to using a shared key which provides more access and is a greater security risk if compromised.
Rework size limits so that this->size is always the current size no matter how much is allocated.
Most importantly, this removes the conditional in bufSize(), which makes it a better candidate for inlining.
When coverage testing ASSERT() macros in inline functions will be expanded and won't be recognized in our coverage rules that ignore ASSERT(). Since there are then uncovered conditions the coverage is incomplete.
The prior method required copying several lines of code and an explanatory comment into each inline function. Instead create a special macro for inclusion in inline functions.
Another possibility would be to automatically identify inline functions and add them to the coverage exclusions but that's an idea for another day.
The prior method of writing headers as strings could expose secrets in trace level logs.
Instead write the entire request as a buffer to prevent secrets from being logged and also reduce the amount of logging.
This caused restore to replace files based on timestamp and size rather than overwriting, which meant some files that should have been updated were left unchanged. Normal restore and restore --delta were not affected by this issue.
httpUriDecode() reverses the encoding in httpUriEncode().
httpQueryNewStr() creates a new HttpQuery by parsing a query string.
httpQueryMerge() merges the contents of one query into another query.
Azure and Azure-compatible object stores can now be used for repository storage.
Currently only shared key authentication is supported but SAS will be added soon.
There don't appear to be any behavioral changes since PostgreSQL 12 and all the tests pass.
Changes to the control/catalog/WAL versions in subsequent betas may break compatibility but pgBackRest will be updated with each release to keep pace.
There is no need to have parallelism enabled in a backup control session. In particular, 9.6 marks pg_stop_backup() as parallel-safe but an error will be thrown if pg_stop_backup() is run in a worker.
When uploading large files the upload is split into multiple parts which are assembled at the end to create the final file. Previously we waited until each part was acknowledged before starting on the processing (i.e. compression, etc.) of the next part.
Now, the request for each part is sent while processing continues and the response is read just before sending the request for the next part. This asynchronous method allows us to continue processing while the S3 server formulates a response.
Testing from outside AWS in a high-bandwidth, low-latency environment showed a 35% improvement in the upload time of 1GB files. The time spent waiting for multipart notifications was reduced by ~300% (this measurement included the final part which is not uploaded asynchronously).
There are still some possible improvements: 1) the creation of the multipart id could be made asynchronous when it looks like the upload will need to be multipart (this may incur cost if the upload turns out not to be multipart). 2) allow more than one async request (this will use more memory).
A fair amount of refactoring was required to make the HTTP responses asynchronous. This may seem like overkill but having well-defined request, response, and session objects will also be advantageous for the upcoming HTTP server functionality.
Another advantage is that the lifecycle of an HttpSession is better defined. We only want to reuse sessions that complete the request/response cycle successfully, otherwise we consider the session to be in a bad state and would prefer to start clean with a new one. Previously, this required complex notifications to mark a session as "successfully done". Now, ownership of the session is passed to the request and then the response and only returned to the client after a successful response. If an error occurs anywhere along the way the session will be automatically closed by the object destructor when the request/response object is freed (depending on which one currently owns the session).
strCat() did not follow our convention of appending Z to functions that accept zero-terminated strings rather than String objects.
Add strCatZ() to accept zero-terminated strings and update strCat() to accept String objects.
Use LF_STR where appropriate but don't use other String constants because they do not improve readability.
Test matrices were previously simplified for the mock/* tests (e.g. d4410611, d489eb87) but not for real/all since the rules for which tests would run with which options was extremely complex. This only got more complex when new compression formats were added.
Because the loop-generated matrix was so large, mosts tests were skipped for most option combinations following arcane logic which was nearly impossible to decipher even when reading the code, and completely impossible from the test.pl interface. As a consequence, important tests got excluded. For example, backup from standby was excluded for most versions of PostgreSQL because it was only run once per distro, against the latest version to be included in that distro.
Simplify the tests by having a single run per PostgreSQL version and vary test parameters according to the capabilities of each version and the underlying distro. So, ZST testing is based on whether the distro supports ZST. Every test is run for each set of parameters based on the capabilities of the PostgreSQL version, e.g. backup from standby is not attempted on versions that don't support it.
Note that since more tests are running the overall time to run the mock/all tests has increased by about 20-25%. Some time may be saved my removing tests that are adequately covered by unit tests but that should the subject of another commit. Another option would be to limit some non version-specific tests to a single, well defined version of PostgreSQL, .e.g the version that is run by expect tests, currently 9.6.
The motivation for this refactor is that new storage drivers are coming and the loop-generated test matrix simply was not up to the task of adding them.
The following is an example of the new test log (note longer runtime of each test):
module=real, test=all, run=1, pg-version=10 (106.91s)
module=real, test=all, run=1, pg-version=9.5 (151.09s)
module=real, test=all, run=1, pg-version=9.2 (123.11s)
module=real, test=all, run=1, pg-version=9.1 (129s)
vs. the old test log (sub-second tests were skipped entirely):
module=real, test=all, run=2, pg-version=10 (0.31s)
module=real, test=all, run=3, pg-version=10 (0.26s)
module=real, test=all, run=4, pg-version=10 (60.39s)
module=real, test=all, run=1, pg-version=10 (69.12s)
module=real, test=all, run=6, pg-version=10 (34s)
module=real, test=all, run=5, pg-version=10 (42.75s)
module=real, test=all, run=2, pg-version=9.5 (0.21s)
module=real, test=all, run=3, pg-version=9.5 (0.21s)
module=real, test=all, run=4, pg-version=9.5 (0.21s)
module=real, test=all, run=5, pg-version=9.5 (0.26s)
module=real, test=all, run=6, pg-version=9.5 (0.21s)
module=real, test=all, run=1, pg-version=9.2 (72.78s)
module=real, test=all, run=2, pg-version=9.2 (0.26s)
module=real, test=all, run=3, pg-version=9.2 (0.31s)
module=real, test=all, run=4, pg-version=9.2 (0.21s)
module=real, test=all, run=5, pg-version=9.2 (0.21s)
module=real, test=all, run=6, pg-version=9.2 (0.21s)
module=real, test=all, run=1, pg-version=9.5 (88.41s)
module=real, test=all, run=2, pg-version=9.1 (0.21s)
module=real, test=all, run=3, pg-version=9.1 (0.26s)
module=real, test=all, run=4, pg-version=9.1 (0.21s)
module=real, test=all, run=5, pg-version=9.1 (0.31s)
module=real, test=all, run=6, pg-version=9.1 (0.26s)
module=real, test=all, run=1, pg-version=9.1 (72.4s)
The unsupported version error is showing up on older versions of PostgreSQL (e.g. 9.1, 9.2) on RHEL6 when setting up a standby with streaming replication. The error occurs when a client does not properly send a version number and it's not clear why it is happening here, but it does not appear to have anything to do with pgBackRest and only affects RHEL6, i.e. 9.1 and 9.2 do not show this error on other distros.
For now ignore the error since RHEL6 is nearly EOL.
HTTP is an acronym so it should be capitalized. Coding conventions dictate otherwise for function and type names but that should not have been propagated to comments and messages.
strPtr() is called more than any other function and during profiling (with or without optimization) it can end up using a disproportionate amount of the total runtime. Even though it is fast, the profiler has a minimum resolution for each function call so strPtr() will often end up towards the top of the list even though the real runtime is quite small.
Instead, inline strPtr() and indicate to gcc that it should be inlined even for non-optimized builds, since that's how profiles are usually generated.
To make strPtr() smaller require "this" to be non-NULL and add another function, strPtrNull(), to deal with the few cases where we need NULL handling.
As a bonus this makes the executable about 1% smaller even when compared to a prior optimized build which would inline some percentage of strPtr() calls.
