public PageRequester(CrawlConfiguration config)
{
if (config == null)
throw new ArgumentNullException("config");
_userAgentString = config.UserAgentString.Replace("@ABOTASSEMBLYVERSION@", Assembly.GetAssembly(this.GetType()).GetName().Version.ToString());
_config = config;
if (_config.HttpServicePointConnectionLimit > 0)
ServicePointManager.DefaultConnectionLimit = _config.HttpServicePointConnectionLimit;
}
public CrawlConfiguration Convert()
{
AutoMapper.Mapper.CreateMap<CrawlBehaviorElement, CrawlConfiguration>();
AutoMapper.Mapper.CreateMap<PolitenessElement, CrawlConfiguration>();
CrawlConfiguration config = new CrawlConfiguration();
AutoMapper.Mapper.Map<CrawlBehaviorElement, CrawlConfiguration>(CrawlBehavior, config);
AutoMapper.Mapper.Map<PolitenessElement, CrawlConfiguration>(Politeness, config);
foreach (ExtensionValueElement element in ExtensionValues)
config.ConfigurationExtensions.Add(element.Key, element.Value);
return config;
}
public PoliteWebCrawler(
CrawlConfiguration crawlConfiguration,
ICrawlDecisionMaker crawlDecisionMaker,
IThreadManager threadManager,
IScheduler scheduler,
IPageRequester httpRequester,
IHyperLinkParser hyperLinkParser,
IMemoryManager memoryManager,
IDomainRateLimiter domainRateLimiter,
IRobotsDotTextFinder robotsDotTextFinder)
: base(crawlConfiguration, crawlDecisionMaker, threadManager, scheduler, httpRequester, hyperLinkParser, memoryManager)
{
_domainRateLimiter = domainRateLimiter ?? new DomainRateLimiter(_crawlContext.CrawlConfiguration.MinCrawlDelayPerDomainMilliSeconds);
_robotsDotTextFinder = robotsDotTextFinder ?? new RobotsDotTextFinder(new PageRequester(_crawlContext.CrawlConfiguration));
}
protected virtual void PrintConfigValues(CrawlConfiguration config)
{
_logger.Info("Configuration Values:");
string indentString = new string(' ', 2);
foreach (PropertyInfo property in config.GetType().GetProperties())
{
if (property.Name != "ConfigurationExtensions")
_logger.InfoFormat("{0}{1}: {2}", indentString, property.Name, property.GetValue(config, null));
}
foreach (string key in config.ConfigurationExtensions.Keys)
{
_logger.InfoFormat("{0}{1}: {2}", indentString, key, config.ConfigurationExtensions[key]);
}
}
/// <summary>
/// Creates a crawler instance with custom settings or implementation. Passing in null for all params is the equivalent of the empty constructor.
/// </summary>
/// <param name="threadManager">Distributes http requests over multiple threads</param>
/// <param name="scheduler">Decides what link should be crawled next</param>
/// <param name="httpRequester">Makes the raw http requests</param>
/// <param name="hyperLinkParser">Parses a crawled page for it's hyperlinks</param>
/// <param name="crawlDecisionMaker">Decides whether or not to crawl a page or that page's links</param>
/// <param name="crawlConfiguration">Configurable crawl values</param>
public WebCrawler(
CrawlConfiguration crawlConfiguration,
ICrawlDecisionMaker crawlDecisionMaker,
IThreadManager threadManager,
IScheduler scheduler,
IPageRequester httpRequester,
IHyperLinkParser hyperLinkParser,
IMemoryManager memoryManager)
{
_crawlContext = new CrawlContext();
_crawlContext.CrawlConfiguration = crawlConfiguration ?? GetCrawlConfigurationFromConfigFile() ?? new CrawlConfiguration();
CrawlBag = _crawlContext.CrawlBag;
_threadManager = threadManager ?? new ManualThreadManager(_crawlContext.CrawlConfiguration.MaxConcurrentThreads);
_scheduler = scheduler ?? new FifoScheduler(_crawlContext.CrawlConfiguration.IsUriRecrawlingEnabled);
_httpRequester = httpRequester ?? new PageRequester(_crawlContext.CrawlConfiguration);
_crawlDecisionMaker = crawlDecisionMaker ?? new CrawlDecisionMaker();
if (_crawlContext.CrawlConfiguration.MaxMemoryUsageInMb > 0
|| _crawlContext.CrawlConfiguration.MinAvailableMemoryRequiredInMb > 0)
_memoryManager = memoryManager ?? new MemoryManager(new CachedMemoryMonitor(new GcMemoryMonitor(), _crawlContext.CrawlConfiguration.MaxMemoryUsageCacheTimeInSeconds));
_hyperLinkParser = hyperLinkParser ?? new HapHyperLinkParser();
_crawlContext.Scheduler = _scheduler;
}
