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Add Support for Retry in WP CLI Core Download Command #258

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Add Support for Retry in WP CLI Core Download Command #258

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161eb20
Add retry and retry-delay in core download cli
abhi3315 Apr 26, 2024
742714d
Exit early from the retry loop if the status is ok or 404
abhi3315 Apr 26, 2024
76c4f61
Fix phpcs code sniffing issue
abhi3315 Apr 26, 2024
dd81ca8
Add max retry to 5 and remove control of retry-delay
abhi3315 Apr 26, 2024
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82 changes: 68 additions & 14 deletions src/Core_Command.php
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,9 @@ public function check_update( $_, $assoc_args ) {
* [--version=<version>]
* : Select which version you want to download. Accepts a version number, 'latest' or 'nightly'.
*
* [--retry=<count>]
* : Number of retries in case of failure. Default is 0. Maximum is 5 retries.
*
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Given our conversation on Zoom today, I think we should change this slightly.

  • Within wp core download, I think we should only have --retry=<count> as an argument. This will let us be opinionated about exponential backoff.
  • We can update Utils\http_request() to support 'retry' and 'retry_delay' as arguments.
  • The --retry=<count> argument should be applied to all HTTP requests within wp core download.

If WordPress.org is down in some manner, it's not helpful for WP-CLI users to keep hammering it with requests. Their systems should be tolerant to this fault. However, --retry=<count> with exponential (or linear) backoff (5 to ~30 seconds) and a maximum count seems like a good compromise.

We should have some tests!

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@danielbachhuber As discussed in the call, we decided to wrap the whole try-catch block inside the do-while loop to handle the retry feature. But after taking a deeper look into it there are many early and exception throwing that may break the retry loop in between.

We should keep the retry loop in the download command only because updating the http_request util will affect other commands as well.

* [--skip-content]
* : Download WP without the default themes and plugins.
*
Expand Down Expand Up @@ -290,28 +293,79 @@ function () use ( $temp ) {
'insecure' => $insecure,
];

$response = Utils\http_request( 'GET', $download_url, null, $headers, $options );
$retry = (int) Utils\get_flag_value( $assoc_args, 'retry', 0 );
$retry_delay = 5; // It will be incremented in the loop after each retry.
$current_try = 1;

if ( 5 < $retry ) {
WP_CLI::warning( 'Maximum number of retries can be 5. Resetting to 5.' );

if ( 404 === (int) $response->status_code ) {
WP_CLI::error( 'Release not found. Double-check locale or version.' );
} elseif ( 20 !== (int) substr( $response->status_code, 0, 2 ) ) {
WP_CLI::error( "Couldn't access download URL (HTTP code {$response->status_code})." );
$retry = 5;
}

do {
$response = Utils\http_request( 'GET', $download_url, null, $headers, $options );
$status_code = (int) $response->status_code;
$is_response_ok = $status_code >= 200 && $status_code < 300;

// Exit the loop if the response is OK or the status code is 404.
if ( $is_response_ok || 404 === $status_code ) {
$retry = 0;
}

if ( 404 === $status_code ) {
WP_CLI::error( 'Release not found. Double-check locale or version.' );
} elseif ( ! $is_response_ok ) {
WP_CLI::warning( "Couldn't access download URL (HTTP code {$response->status_code})." );

if ( 0 < $retry ) {
$retry_delay *= $current_try++;

WP_CLI::log( "Retrying in {$retry_delay} seconds. {$retry} retries left." );
sleep( $retry_delay );
}
}
} while ( 0 < $retry-- && ! $is_response_ok );

if ( 'nightly' !== $version ) {
unset( $options['filename'] );
$md5_response = Utils\http_request( 'GET', $download_url . '.md5', null, [], $options );
if ( $md5_response->status_code >= 200 && $md5_response->status_code < 300 ) {
$md5_file = md5_file( $temp );

if ( $md5_file === $md5_response->body ) {
WP_CLI::log( 'md5 hash verified: ' . $md5_file );
$retry = (int) Utils\get_flag_value( $assoc_args, 'retry', 0 );
$retry_delay = 5; // It will be incremented in the loop after each retry.
$current_try = 1;

do {
$md5_response = Utils\http_request( 'GET', $download_url . '.md5', null, [], $options );
$status_code = (int) $md5_response->status_code;
$is_response_ok = $status_code >= 200 && $status_code < 300;

// Exit the loop if the response is OK or the status code is 404.
if ( $is_response_ok || 404 === $status_code ) {
$retry = 0;
}

if ( $is_response_ok ) {
$md5_file = md5_file( $temp );

if ( $md5_file === $md5_response->body ) {
WP_CLI::log( 'md5 hash verified: ' . $md5_file );
} else {
WP_CLI::error( "md5 hash for download ({$md5_file}) is different than the release hash ({$md5_response->body})." );
}
} elseif ( 404 === $status_code ) {
WP_CLI::warning( 'md5 hash not found for release.' );
} else {
WP_CLI::error( "md5 hash for download ({$md5_file}) is different than the release hash ({$md5_response->body})." );
WP_CLI::warning( "Couldn't access md5 hash for release ({$download_url}.md5, HTTP code {$md5_response->status_code})." );

if ( 0 < $retry ) {
$retry_delay *= $current_try++;

WP_CLI::log( "Retrying in {$retry_delay} seconds. {$retry} retries left." );
sleep( $retry_delay );
}
}
} else {
WP_CLI::warning( "Couldn't access md5 hash for release ({$download_url}.md5, HTTP code {$md5_response->status_code})." );
}
} while ( 0 < $retry-- && ! $is_response_ok );

} else {
WP_CLI::warning( 'md5 hash checks are not available for nightly downloads.' );
}
Expand Down