You are right. I will fine tune my determine which is a good question to ask
mechanism :)
On Tue, Sep 8, 2009 at 12:54 PM, Timothy Perrett <timo...@getintheloop.eu>wrote:
>
> IMHO, you'd probably get better traction with such questions in a
> wider audience on the main scala-user list over at EPFL...
>
> Cheers, Tim
>
>
> On 8 Sep 2009, at 17:26, Jack Widman wrote:
>
> > Right. I will try to keep to the topic :)
> >
> > I actually found him and he quickly answered me.
> >
> > On Tue, Sep 8, 2009 at 12:24 PM, David Pollak <
> feeder.of.the.be...@gmail.com
> > > wrote:
> > Jack,
> >
> > I'm not sure where N8han (the author of Databinder) hangs out, but
> > it's not on the Lift list. :-(
> >
> > Sorry.
> >
> > David
> >
> >
> > On Tue, Sep 8, 2009 at 8:58 AM, jack <jack.wid...@gmail.com> wrote:
> >
> > Please forgive me for including so much code but I have an important
> > demo fast approaching and I'm kind of in a bind. I am using
> > Databinders Dispatch http library which is a wrapper around Javas
> > HttpClient library. I have included the Http class below. Does anyone
> > see how to set the user-agent header. Once again I apologize and would
> > be much obliged for any help.
> >
> > import collection.Map
> > import collection.immutable.{Map => IMap}
> > import util.DynamicVariable
> > import java.io.
> > {InputStream,OutputStream,BufferedInputStream,BufferedOutputStream}
> > import java.net.URI
> > import java.util.zip.GZIPInputStream
> >
> > import org.apache.http._
> > import org.apache.http.client._
> > import org.apache.http.impl.client.{DefaultHttpClient,
> > BasicCredentialsProvider}
> > import org.apache.http.client.methods._
> > import org.apache.http.client.entity.UrlEncodedFormEntity
> > import org.apache.http.client.utils.URLEncodedUtils
> >
> > import org.apache.http.entity.StringEntity
> > import org.apache.http.message.BasicNameValuePair
> > import org.apache.http.protocol.HTTP.UTF_8
> > import org.apache.http.params.{HttpProtocolParams, BasicHttpParams}
> > import org.apache.http.util.EntityUtils
> > import org.apache.http.auth.{AuthScope, UsernamePasswordCredentials,
> > Credentials}
> >
> > case class StatusCode(code: Int, contents:String)
> > extends Exception("Exceptional resoponse code: " + code + "\n" +
> > contents)
> >
> > /** Http access point. Standard instances to be used by a single
> > thread. */
> > class Http {
> > val credentials = new DynamicVariable[Option[(AuthScope,
> > Credentials)]](None)
> > val client = new ConfiguredHttpClient
> >
> > def credentialsProvider = new BasicCredentialsProvider {
> > override def getCredentials(scope: AuthScope) = null
> > }
> >
> > /** /** Info Logger for this instance, default returns Connfiggy if
> > on classpath else console logger. */
> > lazy val log: Logger = try {
> > new Logger {
> > val delegate = net.lag.logging.Logger.get
> > def info(msg: String, items: Any*) { delegate.info(msg, items:
> > _*) }
> > }
> > } catch {
> > case e: NoClassDefFoundError => new Logger {
> > def info(msg: String, items: Any*) {
> > println("INF: [console logger] dispatch: " + msg.format(items:
> > _*))
> > }
> > }
> > }
> > **/
> > /** Execute method for the given host, with logging. */
> > def execute(host: HttpHost, req: HttpUriRequest) = {
> > //log.info("%s %s%s", req.getMethod, host, req.getURI)
> > client.execute(host, req)
> > }
> > /** Execute for given optional parametrs, with logging. Creates
> > local scope for credentials. */
> > val execute: (Option[HttpHost], Option[Credentials], HttpUriRequest)
> > => HttpResponse = {
> > case (Some(host), Some(creds), req) =>
> > client.credentials.withValue(Some((new AuthScope
> > (host.getHostName, host.getPort), creds)))(execute(host, req))
> > case (None, Some(creds), _) => error("Credentials specified
> > without explicit host")
> > case (Some(host), _, req) => execute(host, req)
> > case (_, _, req) =>
> > //log.info("%s %s", req.getMethod, req.getURI)
> > client.execute(req)
> > }
> > /** Execute full request-response handler. */
> > def x[T](hand: Handler[T]): T = x(hand.request)(hand.block)
> > /** Execute request and handle response codes, response, and entity
> > in block */
> > def x [T](req: Request)(block: Handler.F[T]) = {
> > val res = execute(req.host, req.creds, req.req)
> > val ent = res.getEntity match {
> > case null => None
> > case ent => Some(ent)
> > }
> > try { block(res.getStatusLine.getStatusCode, res, ent) }
> > finally { ent foreach (_.consumeContent) }
> > }
> > /** Apply Response Handler if reponse code returns true from chk. */
> > def when[T](chk: Int => Boolean)(hand: Handler[T]) = x(hand.request)
> > {
> > case (code, res, ent) if chk(code) => hand.block(code, res, ent)
> > case (code, _, Some(ent)) => throw StatusCode(code,
> > EntityUtils.toString(ent, UTF_8))
> > case (code, _, _) => throw StatusCode(code, "[no entity]")
> > }
> > /** Apply a custom block in addition to predefined response Handler.
> > */
> > def also[A,B](hand: Handler[B])(block: Handler.F[A]) =
> > x(hand.request) { (code, res, ent) => ( hand.block(code, res,
> > ent), block(code, res, ent) ) }
> >
> > /** Apply handler block when response code is 200 - 204 */
> > def apply[T](hand: Handler[T]) = (this when {code => (200 to 204)
> > contains code})(hand)
> > }
> >
> > /** Nil request, useful to kick off a descriptors that don't have a
> > factory. */
> > object /\ extends Request(None, None, Nil)
> >
> > /* Factory for requests from a host */
> > object :/ {
> > def apply(hostname: String, port: Int): Request =
> > new Request(Some(new HttpHost(hostname, port)), None, Nil)
> >
> > def apply(hostname: String): Request = new Request(Some(new HttpHost
> > (hostname)), None, Nil)
> > }
> >
> > /** Factory for requests from a directory, prepends '/'. */
> > object / {
> > def apply(path: String) = /\ / path
> > }
> >
> > object Request {
> > /** Request transformer */
> > type Xf = HttpRequestBase => HttpRequestBase
> > /** Updates the request URI with the given string-to-string
> > function. (mutates request) */
> > def uri_xf(sxf: String => String)(req: HttpRequestBase) = {
> > req.setURI(URI.create(sxf(req.getURI.toString)))
> > req
> > }
> > }
> >
> > /** Request handler, contains request descriptor and a function to
> > transform the result. */
> > case class Handler[T](request: Request, block: Handler.F[T]) extends
> > Handlers {
> > /** Create a new handler with block that receives all response
> > parameters and
> > this handler's block converted to parameterless function. */
> > def apply[R](next: (Int, HttpResponse, Option[HttpEntity], () => T)
> > => R) =
> > new Handler(request, {(code, res, ent) =>
> > next(code, res, ent, () => block(code, res, ent))
> > })
> > }
> >
> > object Handler {
> > type F[T] = (Int, HttpResponse, Option[HttpEntity]) => T
> > /** Turns a simple entity handler in into a full response handler
> > that fails if no entity */
> > def apply[T](req: Request, block: HttpEntity => T): Handler[T] =
> > Handler(req, { (code, res, ent) => ent match {
> > case Some(ent) => block(ent)
> > case None => error("response has no entity: " + res)
> > } } )
> > }
> >
> > class Post(val values: Map[String, Any]) extends HttpPost {
> > this setEntity new UrlEncodedFormEntity(Http.map2ee(values), UTF_8)
> > }
> >
> > /** Request descriptor, possibly contains a host, credentials, and a
> > list of transformation functions. */
> > class Request(val host: Option[HttpHost], val creds: Option
> > [Credentials], val xfs: List[Request.Xf]) extends Handlers {
> >
> > /** Construct with path or full URI. */
> > def this(str: String) = this(None, None, Request.uri_xf(cur => cur +
> > str)_ :: Nil)
> >
> > /** Construct as a clone, e.g. in class extends clause. */
> > def this(req: Request) = this(req.host, req.creds, req.xfs)
> >
> > def next(xf: Request.Xf) = new Request(host, creds, xf :: xfs)
> > def next_uri(sxf: String => String) = next(Request.uri_xf(sxf))
> >
> > def mimic(dest: HttpRequestBase)(req: HttpRequestBase) = {
> > dest.setURI(req.getURI)
> > dest.setHeaders(req.getAllHeaders)
> > dest
> > }
> >
> > // The below functions create new request descriptors based off of
> > the current one.
> > // Most are intended to be used as infix operators; those that don't
> > take a parameter
> > // have character names to be used with dot notation, e.g. /:
> > ("example.com").HEAD.secure >>> {...}
> >
> > /** Set credentials to be used for this request; requires a host
> > value :/(...) upon execution. */
> > def as (name: String, pass: String) =
> > new Request(host, Some(new UsernamePasswordCredentials(name,
> > pass)), xfs)
> >
> > /** Convert this to a secure (scheme https) request if not already
> > */
> > def secure = new Request(host map {
> > h => new HttpHost(h.getHostName, h.getPort, "https") // default
> > port -1 works for either
> > } orElse { error("secure requires an explicit host") }, creds, xfs)
> >
> > /** Combine this request with another. */
> > def <& (req: Request) = new Request(host orElse req.host, creds
> > orElse req.creds, req.xfs ::: xfs)
> >
> > /** Combine this request with another handler. */
> > def >& [T] (other: Handler[T]) = new Handler(this <& other.request,
> > other.block)
> >
> > /** Append an element to this request's path, joins with '/'.
> > (mutates request) */
> > def / (path: String) = next_uri { _ + "/" + path }
> >
> > /** Add headers to this request. (mutates request) */
> > def <:< (values: Map[String, String]) = next { req =>
> > values foreach { case (k, v) => req.addHeader(k, v) }
> > req
> > }
> >
> > /* Add a gzip acceptance header */
> > def gzip = this <:< IMap("Accept-Encoding" -> "gzip")
> >
> > /** Put the given object.toString and return response wrapper. (new
> > request, mimics) */
> > def <<< (body: Any) = next {
> > val m = new HttpPut
> > m setEntity new StringEntity(body.toString, UTF_8)
> > HttpProtocolParams.setUseExpectContinue(m.getParams, false)
> > mimic(m)_
> > }
> > /** Post the given key value sequence and return response wrapper.
> > (new request, mimics) */
> > def << (values: Map[String, Any]) = next { mimic(new Post(values))
> > _ }
> >
> > /** Add query parameters. (mutates request) */
> > def <<? (values: Map[String, Any]) = next_uri { uri =>
> > if (values.isEmpty) uri
> > else uri + (
> > if (uri contains '?') '&' + Http.q_str(values) else (Http ?
> > values)
> > )
> > }
> >
> > // generators that change request method without adding parameters
> >
> > /** HTTP post request. (new request, mimics) */
> > def POST = next { mimic(new Post(IMap.empty))_ }
> >
> > /** HTTP delete request. (new request, mimics) */
> > def DELETE = next { mimic(new HttpDelete)_ }
> >
> > /** HTTP head request. (new request, mimics). See >:> to access
> > headers. */
> > def HEAD = next { mimic(new HttpHead)_ }
> >
> > // end Request generators
> >
> > /** Builds underlying request starting with a blank get and applying
> > transformers right to left. */
> > lazy val req = {
> > val start: HttpRequestBase = new HttpGet("")
> > (xfs :\ start) { (a,b) => a(b) }
> > }
> >
> > /** @return URI based on this request, e.g. if needed outside
> > Disptach. */
> > def to_uri = Http.to_uri(host, req)
> >
> > /** Use this request for trait Handlers */
> > val request = this
> > }
> > trait Handlers {
> > /** the below functions produce Handlers based on this request
> > descriptor */
> > val request: Request
> >
> > /** Handle InputStream in block, handle gzip if so encoded. */
> > def >> [T] (block: InputStream => T) = Handler(request, { ent =>
> > block (
> > if(ent.getContentEncoding != null &&
> > ent.getContentEncoding.getValue == "gzip")
> > new GZIPInputStream(ent.getContent)
> > else ent.getContent
> > ) } )
> > /** Handle some non-huge response body as a String, in a block. */
> > def >- [T] (block: String => T) = >> { stm => block
> > (scala.io.Source.fromInputStream(stm).mkString) }
> > /** Return some non-huge response as a String. */
> > def as_str = >- { s => s }
> > /** Write to the given OutputStream. */
> > def >>> [OS <: OutputStream](out: OS) = Handler(request, { ent =>
> > ent.writeTo(out); out })
> > /** Process response as XML document in block */
> > def <> [T] (block: xml.Elem => T) = >> { stm => block(xml.XML.load
> > (stm)) }
> >
> > /** Process header as Map in block. Map returns empty set for header
> > name misses. */
> > def >:> [T] (block: IMap[String, Set[String]] => T) =
> > Handler(request, (_, res, _) =>
> > block((IMap[String, Set[String]]().withDefaultValue(Set()) /:
> > res.getAllHeaders) {
> > (m, h) => m + (h.getName -> (m(h.getName) + h.getValue))
> > } )
> > )
> >
> > /** Ignore response body. */
> > def >| = Handler(request, (code, res, ent) => ())
> >
> > /** Split into two request handlers, return results of each in
> > tuple. */
> > def >+ [A, B] (block: Handlers => (Handler[A], Handler[B])) = {
> > new Handler[(A,B)] ( request, { (code, res, opt_ent) =>
> > val (a, b) = block(new Handlers { val request = /\ })
> > (a.block(code, res, opt_ent), b.block(code,res,opt_ent))
> > } )
> > }
> > }
> >
> > /** Basic extension of DefaultHttpClient defaulting to Http 1.1, UTF8,
> > and no Expect-Continue.
> > Scopes authorization credentials to particular requests thorugh a
> > DynamicVariable. */
> > class ConfiguredHttpClient extends DefaultHttpClient {
> > override def createHttpParams = {
> > val params = new BasicHttpParams
> > HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1)
> > HttpProtocolParams.setContentCharset(params, UTF_8)
> > HttpProtocolParams.setUseExpectContinue(params, false)
> > params
> > }
> > val credentials = new DynamicVariable[Option[(AuthScope,
> > Credentials)]](None)
> > setCredentialsProvider(new BasicCredentialsProvider {
> > override def getCredentials(scope: AuthScope) = credentials.value
> > match {
> > case Some((auth_scope, creds)) if scope.`match`(auth_scope) >= 0
> > => creds
> > case _ => null
> > }
> > })
> > }
> >
> > /** Used by client APIs to build Handler or other objects via
> > chaining, completed implicitly.
> > * @see Http#builder2product */
> > trait Builder[T] { def product:T }
> >
> > /** May be used directly from any thread. */
> > object Http extends Http {
> > import org.apache.http.conn.scheme.
> > {Scheme,SchemeRegistry,PlainSocketFactory}
> > import org.apache.http.conn.ssl.SSLSocketFactory
> > import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager
> >
> > /** import to support e.g. Http("http://example.com/"; >>>
> > System.out) */
> > implicit def str2req(str: String) = new Request(str)
> >
> > implicit def builder2product[T](builder: Builder[T]) =
> > builder.product
> >
> > override val client = new ConfiguredHttpClient {
> > override def createClientConnectionManager() = {
> > val registry = new SchemeRegistry()
> > registry.register(new Scheme("http",
> > PlainSocketFactory.getSocketFactory(), 80))
> > registry.register(new Scheme("https",
> > SSLSocketFactory.getSocketFactory(), 443))
> > new ThreadSafeClientConnManager(getParams(), registry)
> > }
> > }
> > /** Shutdown connection manager, threads. (Needed to close console
> > cleanly.) */
> > def shutdown() = client.getConnectionManager.shutdown()
> >
> > /** Convert repeating name value tuples to list of pairs for
> > httpclient */
> > def map2ee(values: Map[String, Any]) = java.util.Arrays asList (
> > values.toSeq map { case (k, v) => new BasicNameValuePair(k,
> > v.toString) } toArray : _*
> > )
> > /** @return %-encoded string for use in URLs */
> > def % (s: String) = java.net.URLEncoder.encode(s, UTF_8)
> >
> > /** @return %-decoded string e.g. from query string or form body */
> > def -% (s: String) = java.net.URLDecoder.decode(s, UTF_8)
> >
> > /** @return formatted and %-encoded query string, e.g.
> > name=value&name2=value2 */
> > def q_str (values: Map[String, Any]) = URLEncodedUtils.format(map2ee
> > (values), UTF_8)
> >
> > /** @return formatted query string prepended by ? unless values map
> > is empty */
> > def ? (values: Map[String, Any]) = if (values.isEmpty) "" else "?" +
> > q_str(values)
> >
> > /** @return URI built from HttpHost if present combined with a
> > HttpClient request object. */
> > def to_uri(host: Option[HttpHost], req: HttpRequestBase) =
> > URI.create(host.map(_.toURI).getOrElse("")).resolve(req.getURI)
> > }
> >
> >
> >
> >
> >
> > --
> > Lift, the simply functional web framework http://liftweb.net
> > Beginning Scala http://www.apress.com/book/view/1430219890
> > Follow me: http://twitter.com/dpp
> > Git some: http://github.com/dpp
> >
> >
> >
> >
> > >
>
>
> >
>
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