private StationCollection DoWithDisk(StaionCollectionRequest staionCollectionRequest)
{
string path = Path.GetTempPath() + "Weather\\";
Directory.CreateDirectory(path);
path += "StationData.dat";
StationCollection stationCollection;
if (File.Exists(path))
{
using (FileStream fileStream = File.OpenRead(path))
{
stationCollection = Serializer.Deserialize <StationCollection>(fileStream);
}
if (!stationCollection.NeedsToRevalidate())
{
return(stationCollection);
}
staionCollectionRequest.LastRun = stationCollection;
}
stationCollection = Do(staionCollectionRequest);
using (FileStream fileStream = File.Create(path))
{
Serializer.Serialize(fileStream, stationCollection);
}
return(stationCollection);
}
private StationCollection Do(StaionCollectionRequest staionCollectionRequest)
{
HttpWebRequest stationRequest =
WebRequest.CreateHttp("http://www1.ncdc.noaa.gov/pub/data/noaa/isd-history.csv");
if (staionCollectionRequest.LastRun != null)
{
stationRequest.Headers.Add(HttpRequestHeader.CacheControl, "max-age=0");
if (!String.IsNullOrWhiteSpace(staionCollectionRequest.LastRun.ETag))
{
stationRequest.Headers.Add(HttpRequestHeader.IfNoneMatch, staionCollectionRequest.LastRun.ETag);
}
stationRequest.IfModifiedSince = (staionCollectionRequest.LastRun.LastUpdated ??
staionCollectionRequest.LastRun.RunTime);
}
var collection = new StationCollection {
RunTime = DateTime.Now
};
var list = new List <Station>();
try
{
using (WebResponse webResponse = stationRequest.GetResponse())
using (Stream stream = webResponse.GetResponseStream())
if (stream != null)
{
using (var reader = new StreamReader(stream))
{
string stationLine;
bool hasSeenHeader = false;
while ((stationLine = reader.ReadLine()) != null)
{
if (hasSeenHeader)
{
Station station = ParseStation(stationLine);
if (station != default(Station))
{
list.Add(station);
}
}
else if (stationLine ==
@"""USAF"",""WBAN"",""STATION NAME"",""CTRY"",""STATE"",""ICAO"",""LAT"",""LON"",""ELEV(M)"",""BEGIN"",""END""")
{
hasSeenHeader = true;
}
else
{
throw new NotSupportedException("station csv bad");
}
}
collection.ETag = webResponse.Headers["ETag"];
DateTime tempDateTime;
if (DateTime.TryParse(webResponse.Headers["Last-Modified"], out tempDateTime))
{
collection.LastUpdated = tempDateTime;
}
}
}
}
catch (WebException e)
{
HttpStatusCode httpStatusCode = ((HttpWebResponse)e.Response).StatusCode;
if (staionCollectionRequest.LastRun != null && httpStatusCode == HttpStatusCode.NotModified)
{
collection = staionCollectionRequest.LastRun;
collection.RunTime = DateTime.Now;
return(collection);
}
WebExceptionStatus webExceptionStatus = e.Status;
}
// ReSharper disable EmptyGeneralCatchClause
catch (Exception e)
// ReSharper restore EmptyGeneralCatchClause
{}
collection.Stations = list.ToArray();
return(collection);
}
