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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ai.platon.pulsar.skeleton.crawl.component
import ai.platon.pulsar.common.AppContext
import ai.platon.pulsar.common.config.ImmutableConfig
import ai.platon.pulsar.skeleton.common.options.LoadOptions
import ai.platon.pulsar.skeleton.common.persist.ext.loadEvent
import ai.platon.pulsar.skeleton.common.persist.ext.options
import ai.platon.pulsar.skeleton.crawl.CoreMetrics
import ai.platon.pulsar.skeleton.crawl.common.FetchEntry
import ai.platon.pulsar.skeleton.crawl.protocol.ProtocolFactory
import ai.platon.pulsar.skeleton.crawl.protocol.ProtocolNotFound
import ai.platon.pulsar.skeleton.crawl.protocol.ProtocolOutput
import ai.platon.pulsar.skeleton.crawl.protocol.http.ProtocolStatusTranslator
import ai.platon.pulsar.persist.*
import ai.platon.pulsar.persist.metadata.Mark
import ai.platon.pulsar.skeleton.common.persist.ext.loadEventHandlers
import ai.platon.pulsar.skeleton.crawl.GlobalEventHandlers
import org.slf4j.LoggerFactory
import java.util.concurrent.atomic.AtomicBoolean
/**
* The fetch component is the portal to fetch the content of pages.
*/
open class FetchComponent(
val coreMetrics: CoreMetrics? = null,
val protocolFactory: ProtocolFactory,
val immutableConfig: ImmutableConfig,
) : AutoCloseable {
private val logger = LoggerFactory.getLogger(FetchComponent::class.java)
private val tracer = logger.takeIf { it.isTraceEnabled }
private val closed = AtomicBoolean()
val isActive get() = !closed.get() && AppContext.isActive
private val abnormalPage get() = WebPage.NIL.takeIf { !isActive }
/**
* Fetch an url
*
* @param url The url of web page to fetch
* @return The fetch result
*/
@Throws(Exception::class)
fun fetch(url: String) = abnormalPage ?: fetchContent(WebPage.newWebPage(url, immutableConfig.toVolatileConfig()))
/**
* Fetch an url
*
* @param url The url of web page to fetch
* @param options The options
* @return The fetch result
*/
@Throws(Exception::class)
fun fetch(url: String, options: LoadOptions) = abnormalPage ?: fetchContent0(FetchEntry(url, options))
/**
* Fetch a page
*
* @param page The page to fetch
* @return The fetch result
*/
@Throws(Exception::class)
fun fetchContent(page: WebPage) = abnormalPage ?: fetchContent0(FetchEntry(page, page.options))
/**
* Fetch a page
*
* @param fetchEntry The fetch entry
* @return The fetch result
*/
@Throws(Exception::class)
fun fetchContent(fetchEntry: FetchEntry) = abnormalPage ?: fetchContent0(fetchEntry)
/**
* Fetch a page
*
* @param page The page to fetch
* @return The fetch result
*/
@Throws(Exception::class)
suspend fun fetchContentDeferred(page: WebPage) = abnormalPage ?: fetchContentDeferred0(page)
/**
* Fetch a page
*
* @param fetchEntry The fetch entry
* @return The fetched webpage
*/
@Throws(Exception::class)
protected fun fetchContent0(fetchEntry: FetchEntry): WebPage {
val page = fetchEntry.page
require(page.isNotInternal) { "Internal page ${page.url}" }
coreMetrics?.markFetchTaskStart()
onWillFetch(page)
return try {
val protocol = protocolFactory.getProtocol(page)
processProtocolOutput(page, protocol.getProtocolOutput(page))
} catch (e: ProtocolNotFound) {
logger.warn(e.message)
page.also { updateStatus(it, ProtocolStatus.STATUS_PROTO_NOT_FOUND, CrawlStatus.STATUS_UNFETCHED) }
} finally {
onFetched(page)
}
}
/**
* Fetch a page
*
* @param page The page to fetch
* @return The fetch result
*/
@Throws(Exception::class)
protected suspend fun fetchContentDeferred0(page: WebPage): WebPage {
return try {
onWillFetch(page)
coreMetrics?.markFetchTaskStart()
val protocol = protocolFactory.getProtocol(page)
processProtocolOutput(page, protocol.getProtocolOutputDeferred(page))
} catch (e: ProtocolNotFound) {
logger.warn(e.message)
page.also { updateStatus(it, ProtocolStatus.STATUS_PROTO_NOT_FOUND, CrawlStatus.STATUS_UNFETCHED) }
} finally {
onFetched(page)
}
}
private fun onWillFetch(page: WebPage) {
try {
GlobalEventHandlers.pageEventHandlers?.loadEventHandlers?.onWillFetch?.invoke(page)
// The more specific handlers has the opportunity to override the result of more general handlers.
page.loadEventHandlers?.onWillFetch?.invoke(page)
} catch (e: Throwable) {
logger.warn("Failed to invoke onWillFetch | ${page.configuredUrl}", e)
}
}
private fun onFetched(page: WebPage) {
try {
GlobalEventHandlers.pageEventHandlers?.loadEventHandlers?.onFetched?.invoke(page)
// The more specific handlers has the opportunity to override the result of more general handlers.
page.loadEventHandlers?.onFetched?.invoke(page)
} catch (e: Throwable) {
logger.warn("Failed to invoke onFetched | ${page.configuredUrl}", e)
}
}
protected fun processProtocolOutput(page: WebPage, output: ProtocolOutput): WebPage {
val protocolStatus = output.protocolStatus
if (protocolStatus.isCanceled) {
page.isCanceled = true
return page
}
val pageDatum = output.pageDatum
if (pageDatum == null) {
logger.warn("No content | {}", page.configuredUrl)
}
page.isFetched = true
page.headers.putAll(output.headers.asMultimap())
val crawlStatus = ProtocolStatusTranslator.translateToCrawlStatus(protocolStatus, page)
when (crawlStatus) {
CrawlStatus.STATUS_FETCHED,
CrawlStatus.STATUS_REDIR_TEMP,
CrawlStatus.STATUS_REDIR_PERM -> updateFetchedPage(page, pageDatum, protocolStatus, crawlStatus)
else -> updateFetchedPage(page, null, protocolStatus, crawlStatus)
}
coreMetrics?.let { logMetrics(crawlStatus, page, it) }
return page
}
override fun close() {
if (closed.compareAndSet(false, true)) {
}
}
private fun updateFetchedPage(
page: WebPage, pageDatum: PageDatum?,
protocolStatus: ProtocolStatus, crawlStatus: CrawlStatus,
): WebPage {
val pageExt = WebPageExt(page)
updateStatus(page, protocolStatus, crawlStatus)
pageDatum?.also {
page.location = it.location
page.proxy = it.proxyEntry?.agentIp
val trace = it.activeDOMStatTrace
if (trace != null) {
page.activeDOMStatus = trace.status
page.activeDOMStatTrace = mapOf(
"initStat" to trace.initStat, "initD" to trace.initD,
"lastStat" to trace.lastStat, "lastD" to trace.lastD
)
}
it.pageCategory?.let { page.setPageCategory(it) }
it.htmlIntegrity?.let { page.htmlIntegrity = it }
it.lastBrowser?.let { page.lastBrowser = it }
if (protocolStatus.isSuccess) {
// good! persists content for only success pages
pageExt.updateContent(it)
}
}
updateMarks(page)
return page
}
private fun logMetrics(crawlStatus: CrawlStatus, page: WebPage, metrics: CoreMetrics) {
val url = page.url
when (crawlStatus) {
CrawlStatus.STATUS_REDIR_PERM,
CrawlStatus.STATUS_REDIR_TEMP -> metrics.trackMoved(url)
CrawlStatus.STATUS_GONE -> metrics.trackHostUnreachable(url)
}
if (crawlStatus.isFetched) {
metrics.trackSuccess(page)
} else if (crawlStatus.isFailed) {
metrics.trackFailedUrl(url)
}
}
companion object {
private val logger = LoggerFactory.getLogger(FetchComponent::class.java)
fun updateStatus(page: WebPage, protocolStatus: ProtocolStatus, crawlStatus: CrawlStatus) {
page.crawlStatus = crawlStatus
page.protocolStatus = protocolStatus
page.updateFetchCount()
}
fun updateMarks(page: WebPage) {
val marks = page.marks
marks.putIfNotNull(Mark.FETCH, marks[Mark.GENERATE])
}
}
}
