/// <summary>
/// given HttpResponseMessage, invent two candidate target filespecs
/// </summary>
/// <param name="webpage">
/// current webpage being downloaded
/// </param>
/// <param name="rsp">
/// HttpResponseMessage
/// </param>
/// <param name="extn">
/// extension without the dot (e.g. "html")
/// </param>
/// <param name="filespec2">
/// filespec supposed from basic data before the HttpRequest
/// </param>
/// <param name="filespec3">
/// filespec based on the HttpResponse content (or generated if borderline case)
/// </param>
/// <remarks>
/// because this is executed DURING HttpResponse processing, it must be quick (no long debugging!) to avoid timeout
/// </remarks>
void TargetFilespecs(WebPage webpage, HttpResponseMessage rsp, out string extn, out string filespec2, out string filespec3)
{
var filenameOnly = Utils.TrimOrNull(Path.GetFileNameWithoutExtension(webpage.DraftFilespec));
var mtyp = rsp.Content.Headers.ContentType.MediaType; // "application/json", "application/manifest+json"
extn = MimeCollection.LookupExtnFromMime(mtyp) // MediaType takes priority over DraftFilespec for EXTN
?? Utils.TrimOrNull(Path.GetExtension(webpage.DraftFilespec));
var contdisp = rsp.Content.Headers.ContentDisposition;
if (contdisp != null)
{
var FileName = Path.GetFileName( // e.g. "json.json" (prevent any malicious device/folder spec)
Utils.MakeValid(contdisp.FileName ?? contdisp.FileNameStar ?? contdisp.Name)); // filter out any spurious chars(e.g. double-quotes)
if (FileName != null)
{
string extn2;
(filenameOnly, extn2) = Utils.FileExtSplit(FileName); // ContentDisposition.FileName takes priority over webpage.DraftFilespec for file NAME
if (!string.IsNullOrWhiteSpace(extn2))
{
extn = extn2; // ContentDisposition takes priority over MediaType for EXTN
}
}
}
if (extn == null) // abort if no explicit content (i.e. ignore extn in caller's DraftFilespec)
{
// || !ct2extn.IsText TODO: write non-UTF-8 file code
/*
* "application/manifest+json"
*/
throw new ApplicationException($"unknown extn for Url={webpage.Url}"); // TODO: consider accepting a plain filename (no extn)
}
var filespec1 = (filenameOnly ?? Utils.RandomFilenameOnly()) // NB this produces a file5678 format
+ EXTN_SEPARATOR + extn; // filename & extension (ignore any extn in DraftFilespec)
var folder = (extn == HTML) ? HtmlPath : OtherPath; // device & folder path
filespec2 = Utils.TrimOrNull(webpage.Filespec); // if this is a reload, assign the original to filespec2 (will compare later)
filespec2 = filespec3 = (filespec2 != null && !filespec2.StartsWith(ERRTAG)) // skip any previous error message
? filespec2
: Path.Combine(folder, filespec1);
if (File.Exists(filespec2) || filespec2.Length > FILESIZE)
{
webpage.DraftFilespec = filespec1; // keep our 2nd choice of fn.extn [simple debug aid]
do // use alternate file target
{
filespec3 = Path.Combine(folder, Utils.RandomFilenameOnly() + EXTN_SEPARATOR + extn); // no 100% guarantee that file5678.extn file doesn't exist
Debug.Assert(filespec3.Length <= FILESIZE, "reduce folder length for htmldir / otherdir in App.config for AppSettings");
} while (File.Exists(filespec3)); // hopefully rare and finite case !
}
}
//static readonly char[] DIRSEP = { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar };
public static (string filename, string extn) FileExtSplit(string instr)
{
var proto = MakeValid(instr); // will remove any trailing "/". finally does .Trim() but not TrimOrNull()
if (!string.IsNullOrWhiteSpace(proto))
{
var fname = Path.GetFileNameWithoutExtension(proto);
if (!string.IsNullOrWhiteSpace(fname)) // MUST be a filename
{
var extn = Path.GetExtension(proto);
if (extn.Length > 0 && extn[0] == '.')
{
extn = extn.Substring(1);
}
return((MimeCollection.IsValidExtn(extn)) // ANY match ?
? (fname, extn) // yes. pass extn as-is
: (proto, null)); // no. makes no guesses (content/type will prevail later)
}
}
return(null, null);
}
static int MaxFileSize; // don't download files bigger than 10 MB
static async Task Main(string[] _)
{
//string fs1 = @"C:\Ligonier\webcache\state - theology - does - sin - deserve - damnation.html",
// fs2 = @"C:\Ligonier\webcache\assets\bible - plan.pdf";
//var rel = Utils.GetRelativePath(fs1, fs2);
//Console.WriteLine(rel);
dbctx = new WebModel(); // EF context defaults to config: "name=DefaultConnection"
IAsyncPolicy AdoRetryPolicy = // TODO: probably should configure based on App.config
Policy.Handle <Exception>(ex => true) // retry every exception! TODO: improve
.WaitAndRetryAsync(5, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt) / 4)); // i.e. 0.5, 1, 2, 4, 8 second retries
//IRepository repo = new Repository(dbctx);
IRepository repo = new BulkRepository(dbctx, AdoRetryPolicy);
MimeCollection.Load(await repo.GetContentTypeToExtnsAsync());
//var ct = new CancellationToken();
htmldir = ConfigurationManager.AppSettings["htmldir"] ?? @"C:\Ligonier\webcache";
if (!Directory.Exists(htmldir))
{
Directory.CreateDirectory(htmldir);
}
var otherdir = ConfigurationManager.AppSettings["otherdir"] ?? (htmldir + Path.DirectorySeparatorChar + OTHFOLDER);
if (!Directory.Exists(otherdir))
{
Directory.CreateDirectory(otherdir);
}
backupdir = ConfigurationManager.AppSettings["backupdir"] ?? (htmldir + Path.DirectorySeparatorChar + BACKUPFOLDER);
if (!Directory.Exists(backupdir))
{
Directory.CreateDirectory(backupdir);
}
if (!int.TryParse(ConfigurationManager.AppSettings["batchsize"], out var batchSize))
{
batchSize = 4;
}
if (!int.TryParse(ConfigurationManager.AppSettings["maxlinks"], out MaxLinks))
{
MaxLinks = 1500;
}
if (!int.TryParse(ConfigurationManager.AppSettings["maxfilesize"], out MaxFileSize))
{
MaxFileSize = 10_000_000; // 10 MB
}
var ValidRetry = new HttpStatusCode[] {
HttpStatusCode.Ambiguous, // 300
HttpStatusCode.Conflict, // 409
HttpStatusCode.InternalServerError, // 500
HttpStatusCode.NotImplemented, // 501
HttpStatusCode.BadGateway, // 502
HttpStatusCode.ServiceUnavailable, // 503
HttpStatusCode.GatewayTimeout
}; // 504
IAsyncPolicy <HttpResponseMessage> HttpRetryPolicy = // TODO: probably should configure based on App.config
Policy.HandleResult <HttpResponseMessage>(rsp => ValidRetry.Contains(rsp.StatusCode))
.WaitAndRetryAsync(0, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt) / 2)); // i.e. 1, 2, 4 seconds
#pragma warning disable GCop302 // Since '{0}' implements IDisposable, wrap it in a using() statement
//TODO: plug-in Polly as MessageProcessingHandler / whatever !
var Client = new HttpClient(
new HttpClientHandler {
AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate, AllowAutoRedirect = true
})
{
Timeout = new TimeSpan(0, 0, 20)
};
#pragma warning restore GCop302 // Since '{0}' implements IDisposable, wrap it in a using() statement
var p = new Program();
var retrycount = 2;
Downloader download;
do
{
HParser = new HapParser(MaxLinks);
download = new Downloader(repo, Client, HttpRetryPolicy, HParser, htmldir, otherdir, backupdir, MaxFileSize);
var dlresult = await p.DownloadAndParse(repo, batchSize, download);
if (!dlresult) // failure may be due to tainted EF context so have to reset all these
{
dbctx = new WebModel(); // EF context defaults to config: "name=DefaultConnection"
repo = new BulkRepository(dbctx, AdoRetryPolicy);
retrycount--;
}
else
{
break;
}
} while (retrycount >= 0);
Console.WriteLine("*** DownloadAndParse FINISHED ***");
var localise = new Localiser(HParser, htmldir, backupdir, download);
await p.HtmlLocalise(repo, batchSize, localise, getMissing : true);
Console.WriteLine("*** HtmlLocalise FINISHED ***");
#if DEBUG
foreach (var extn in MimeCollection.MissingExtns.OrderBy(e => e))
{
Console.WriteLine($"missing extn\t{extn}");
}
#endif
Console.ReadLine();
}
static async Task Main(string[] args)
{
ctx = new WebModel();
repo = new Repository(ctx);
MimeCollection.Load(await repo.GetContentTypeToExtnsAsync());
allpages = ctx.WebPages.ToList();
var p = new Program();
#region unused
/*
* var urls = new string[] {
* "http://www.ligonier.org", //
* "http://www.ligonier.org/blog",
* "http://www.ligonier.org/blog/category/ministry-news",
* "http://www.ligonier.org?", //
* "http://www.ligonier.org/blog?",
* "http://www.ligonier.org/blog/category/ministry-news?",
* "https://www.ligonier.org", //
* "https://www.ligonier.org/blog",
* "https://www.ligonier.org/blog/category/ministry-news",
* "https://www.ligonier.org?", //
* "https://www.ligonier.org/blog?",
* "https://www.ligonier.org/blog/category/ministry-news?",
* "https://www.ligonier.org/", //
* "https://www.ligonier.org/blog/", //
* "https://www.ligonier.org/blog/category/ministry-news/",
* "https://www.ligonier.org/?", //
* "https://www.ligonier.org/blog/?", //
* "https://www.ligonier.org/blog/category/ministry-news/?",
* "https://www.ligonier.org?abc=123", //
* "https://www.ligonier.org/blog?abc=123", //
* "https://www.ligonier.org/blog/category/ministry-news?abc=123",
* "https://www.ligonier.org/?abc=123", //
* "https://www.ligonier.org/blog/?abc=123", //
* "https://www.ligonier.org/blog/category/ministry-news/?abc=123",
* "https://www.ligonier.org?abc=123", //
* "https://www.ligonier.org/blog?abc=123", //
* "https://www.ligonier.org/blog/category/ministry-news?abc=123"
* };
* foreach (var url in urls)
* {
* var u2 = StdUrl(url);
* }
*/
#endregion
var u = "http://www.ligonier.org/store/keyword/apologetics";
var fs = @"C:\Ligonier\webcache\41m4uuk2.html";
var HParser = new HapParser();
HParser.LoadFromFile(u, fs);
var lnks = HParser.GetLinks();
var url0 = "http://www.ligonier.org/store/keyword/apologetics";
var bld = new UriBuilder(url0);
var url1 = bld.Uri.AbsoluteUri;
if (url0 != url1)
{
Console.WriteLine($"{url0}\t->\t{url1}");
}
foreach (var webpage in allpages)
{
var url = webpage.Url;
var url2 = StdUrl(url);
LookupPage2(webpage, url, url2, changeUrl: true);
url2 = (url2.StartsWith(Uri.UriSchemeHttp))
? Uri.UriSchemeHttps + url2.Substring(Uri.UriSchemeHttp.Length)
: Uri.UriSchemeHttp + url2.Substring(Uri.UriSchemeHttps.Length);
LookupPage2(webpage, url, url2, changeUrl: false);
}
}