fetch cloud oplog (#502)

- Feature: Added `zen oplog-download` command to download the oplog body of a cooked output stored in Cloud DDC
  - Oplog source is specified using one of the following options
	  - `--cloud-url` Cloud artifact URL for oplog
    - `--host` Base host to resolve download host from
    - `--override-host` Specific host to use without resolve
    - `--assume-http2` assume that the builds endpoint is a HTTP/2 endpoint skipping HTTP/1.1 upgrade handshake
    - `--namespace` Builds Storage namespace
    - `--bucket` Builds Storage bucket
	  - `--build-id` an Oid in hex form for the source identifier to use
    - `--yes` suppress conformation query when doing output of a very large oplog to console
    - `--quiet` suppress all non-essential console output
    - `--output-path` path to oplog output, extension .json or .cb (compact binary). Default is output to console
    - `--system-dir` override default system root path
    - Authentication options
	    - Auth token
	      - `--access-token` http auth Cloud Storage access token
	      - `--access-token-env` name of environment variable that holds the Http auth Cloud Storage access token
	      - `--access-token-path` path to json file that holds the Http auth Cloud Storage access token
	      - `--oidctoken-exe-path` path to OidcToken executable
	    - OpenId authentication
	      - `--openid-provider-name` Open ID provider name
	      - `--openid-provider-url` Open ID provider url
	      - `--openid-client-id`Open ID client id
	      - `--openid-refresh-token` Open ID refresh token
	      - `--encryption-aes-key` 256 bit AES encryption key for storing OpenID credentials
	      - `--encryption-aes-iv` 128 bit AES encryption initialization vector for storing OpenID credentials
	    - OAuth authentication
	      - `--oauth-url` OAuth provier url
	      - `--oauth-clientid` OAuth client id
	      - `--oauth-clientsecret` OAuth client secret
- Bugfix: `zen print` command now properly outputs very large compact binary objects as json to console

1 files changed, 18 insertions, 0 deletions

diff --git a/src/zenutil/buildstoragecache.cpp b/src/zenutil/buildstoragecache.cpp
index e5e8db8d2..376d967d1 100644
--- a/src/zenutil/buildstoragecache.cpp
+++ b/src/zenutil/buildstoragecache.cpp
@@ -413,4 +413,22 @@ CreateZenBuildStorageCache(HttpClient&					  HttpClient,
 	return std::make_unique<ZenBuildStorageCache>(HttpClient, Stats, Namespace, Bucket, TempFolderPath, BoostBackgroundThreadCount);
 }
 
+ZenCacheEndpointTestResult
+TestZenCacheEndpoint(std::string_view BaseUrl, const bool AssumeHttp2)
+{
+	HttpClientSettings	 TestClientSettings{.LogCategory	= "httpcacheclient",
+											.ConnectTimeout = std::chrono::milliseconds{1000},
+											.Timeout		= std::chrono::milliseconds{2000},
+											.AssumeHttp2	= AssumeHttp2,
+											.AllowResume	= true,
+											.RetryCount		= 0};
+	HttpClient			 TestHttpClient(BaseUrl, TestClientSettings);
+	HttpClient::Response TestResponse = TestHttpClient.Get("/status/builds");
+	if (TestResponse.IsSuccess())
+	{
+		return {.Success = true};
+	}
+	return {.Success = false, .FailureReason = TestResponse.ErrorMessage("")};
+};
+
 }  // namespace zen