scrala

scrala is a web crawling framework for scala, which is inspired by scrapy.

install

the docker way

gaocegege/scrala in dockerhub

Create a Dockerfile in your project.

FROM gaocegege/scrala:latest

// COPY the build.sbt and the src to the container

Run a single command in docker

docker run -v <your src>:/app/src -v <your ivy2 directory>:/root/.ivy2  gaocegege/scrala

the sbt way

Step 1. Add it in your build.sbt at the end of resolvers:

resolvers += "jitpack" at "https://jitpack.io"

Step 2. Add the dependency

libraryDependencies += "com.github.gaocegege" % "scrala" % "0.1.5"

normal way

git clone https://github.com/gaocegege/scrala.git
cd ./scrala
sbt assembly

You will get the jar in ./target/scala-<version>/.

example

import com.gaocegege.scrala.core.spider.impl.DefaultSpider
import com.gaocegege.scrala.core.common.response.Response
import java.io.BufferedReader
import java.io.InputStreamReader
import com.gaocegege.scrala.core.common.response.impl.HttpResponse
import com.gaocegege.scrala.core.common.response.impl.HttpResponse

class TestSpider extends DefaultSpider {
  def startUrl = List[String]("http://www.gaocegege.com/resume")

  def parse(response: HttpResponse): Unit = {
    val links = (response getContentParser) select ("a")
    for (i <- 0 to links.size() - 1) {
      request(((links get (i)) attr ("href")), printIt)
    }
  }

  def printIt(response: HttpResponse): Unit = {
    println((response getContentParser) title)
  }
}

object Main {
  def main(args: Array[String]) {
    val test = new TestSpider
    test begin
  }
}

Just like the scrapy, what you need to do is define a startUrl to tell me where to start, and override parse(...) to parse the response of the startUrl. And request(...) function is like yield scrapy.Request(...) in scrapy.

You can get the example project in the ./example/

for developer

roadmap

Next version is 0.2, which is also a dev version

1. keep the log output simple and stupid
2. add tests to keep the multi thread downloader high performance
3. add new feature: rules in the spider