fastcolly

package module
v1.3.3 Latest Latest
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 Go to latest Published: Feb 3, 2020 License: Apache-2.0 Imports: 41 Imported by: 0

README

FastColly

Will be changed on Colly:

  • simplify colly (rm something)
  • add fasthttp as httpbackend

Some designs I don't need, so I will remove them, I will also list them.

  • fasthttp API is incompatible with net/http
  • fasthttp doesn't support HTTP/2.0 and WebSockets
  • remove Appengine client
  • scrape func requestData rename as requestBody type is []byte

Base in Colly v1.2.0

Lightning Fast and Elegant Scraping Framework for Gophers

Colly provides a clean interface to write any kind of crawler/scraper/spider.

With Colly you can easily extract structured data from websites, which can be used for a wide range of applications, like data mining, data processing or archiving.

GOCOLLY <- Thanks

Documentation

Overview

Package colly implements a HTTP scraping framework

Index

Constants

View Source 
const ProxyURLKey key = iota

ProxyURLKey is the context key for the request proxy address.

Variables

View Source 
var (
	// ErrForbiddenDomain is the error thrown if visiting
	// a domain which is not allowed in AllowedDomains
	ErrForbiddenDomain = errors.New("Forbidden domain")
	// ErrMissingURL is the error type for missing URL errors
	ErrMissingURL = errors.New("Missing URL")
	// ErrMaxDepth is the error type for exceeding max depth
	ErrMaxDepth = errors.New("Max depth limit reached")
	// ErrForbiddenURL is the error thrown if visiting
	// a URL which is not allowed by URLFilters
	ErrForbiddenURL = errors.New("ForbiddenURL")

	// ErrNoURLFiltersMatch is the error thrown if visiting
	// a URL which is not allowed by URLFilters
	ErrNoURLFiltersMatch = errors.New("No URLFilters match")
	// ErrAlreadyVisited is the error type for already visited URLs
	ErrAlreadyVisited = errors.New("URL already visited")
	// ErrRobotsTxtBlocked is the error type for robots.txt errors
	ErrRobotsTxtBlocked = errors.New("URL blocked by robots.txt")
	// ErrNoCookieJar is the error type for missing cookie jar
	ErrNoCookieJar = errors.New("Cookie jar is not available")
	// ErrNoPattern is the error type for LimitRules without patterns
	ErrNoPattern = errors.New("No pattern defined in LimitRule")
	// ErrEmptyProxyURL is the error type for empty Proxy URL list
	ErrEmptyProxyURL = errors.New("Proxy URL list is empty")
)

Functions

func B2S added in v1.3.0 

func B2S(b []byte) string

b2s converts byte slice to a string without memory allocation. See https://groups.google.com/forum/#!msg/Golang-Nuts/ENgbUzYvCuU/90yGx7GUAgAJ .

Note it may break if string and/or slice header will change in the future go versions.

func S2B added in v1.3.0 

func S2B(s string) (b []byte)

s2b converts string to a byte slice without memory allocation.

Note it may break if string and/or slice header will change in the future go versions.

func SanitizeFileName 

func SanitizeFileName(fileName string) string

SanitizeFileName replaces dangerous characters in a string so the return value can be used as a safe file name.

func UnmarshalHTML 

func UnmarshalHTML(v interface{}, s *goquery.Selection, structMap map[string]string) error

UnmarshalHTML declaratively extracts text or attributes to a struct from HTML response using struct tags composed of css selectors. Allowed struct tags:

  • "selector" (required): CSS (goquery) selector of the desired data
  • "attr" (optional): Selects the matching element's attribute's value. Leave it blank or omit to get the text of the element.

Example struct declaration: 

type Nested struct {
	String  string   `selector:"div > p"`
   Classes []string `selector:"li" attr:"class"`
	Struct  *Nested  `selector:"div > div"`
}

Supported types: struct, *struct, string, []string

Types

type Collector 

type Collector struct {
	// UserAgent is the User-Agent string used by HTTP requests
	UserAgent string
	// MaxDepth limits the recursion depth of visited URLs.
	// Set it to 0 for infinite recursion (default).
	MaxDepth int
	// AllowedDomains is a domain whitelist.
	// Leave it blank to allow any domains to be visited
	AllowedDomains []string
	// DisallowedDomains is a domain blacklist.
	DisallowedDomains []string
	// DisallowedURLFilters is a list of regular expressions which restricts
	// visiting URLs. If any of the rules matches to a URL the
	// request will be stopped. DisallowedURLFilters will
	// be evaluated before URLFilters
	// Leave it blank to allow any URLs to be visited
	DisallowedURLFilters []*regexp.Regexp

	// Leave it blank to allow any URLs to be visited
	URLFilters []*regexp.Regexp

	// AllowURLRevisit allows multiple downloads of the same URL
	AllowURLRevisit bool
	// MaxBodySize is the limit of the retrieved response body in bytes.
	// 0 means unlimited.
	// The default value for MaxBodySize is 10MB (10 * 1024 * 1024 bytes).
	MaxBodySize int
	// CacheDir specifies a location where GET requests are cached as files.
	// When it's not defined, caching is disabled.
	CacheDir string
	// IgnoreRobotsTxt allows the Collector to ignore any restrictions set by
	// the target host's robots.txt file.  See http://www.robotstxt.org/ for more
	// information.
	IgnoreRobotsTxt bool
	// Async turns on asynchronous network communication. Use Collector.Wait() to
	// be sure all requests have been finished.
	Async bool
	// ParseHTTPErrorResponse allows parsing HTTP responses with non 2xx status codes.
	// By default, Colly parses only successful HTTP responses. Set ParseHTTPErrorResponse
	// to true to enable it.
	ParseHTTPErrorResponse bool
	// ID is the unique identifier of a collector
	ID uint32
	// DetectCharset can enable character encoding detection for non-utf8 response bodies
	// without explicit charset declaration. This feature uses https://github.com/saintfish/chardet
	DetectCharset bool
	// RedirectHandler allows control on how a redirect will be managed
	RedirectHandler func(req *http.Request, via []*http.Request) error
	// CheckHead performs a HEAD request before every GET to pre-validate the response
	CheckHead bool

	LimitRules []*LimitRule
	// contains filtered or unexported fields
}

Collector provides the scraper instance for a scraping job

func NewCollector 

func NewCollector(options ...CollectorOption) *Collector

NewCollector creates a new Collector instance with default configuration

func (*Collector) Clone 

func (c *Collector) Clone() *Collector

Clone creates an exact copy of a Collector without callbacks. HTTP backend, robots.txt cache and cookie jar are shared between collectors.

func (*Collector) Cookies 

func (c *Collector) Cookies(URL string) []*http.Cookie

Cookies returns the cookies to send in a request for the given URL.

func (*Collector) DisableCookies 

func (c *Collector) DisableCookies()

DisableCookies turns off cookie handling

func (*Collector) GetMatchingRule added in v1.3.0 

func (c *Collector) GetMatchingRule(domain string) *LimitRule

func (*Collector) Head added in v1.2.0 

func (c *Collector) Head(URL string) error

Head starts a collector job by creating a HEAD request.

func (*Collector) Init 

func (c *Collector) Init()

Init initializes the Collector's private variables and sets default configuration for the Collector

func (*Collector) Limit 

func (c *Collector) Limit(rule *LimitRule) error

Limit adds a new LimitRule to the collector

func (*Collector) Limits 

func (c *Collector) Limits(rules []*LimitRule) error

Limits adds new LimitRules to the collector

func (*Collector) OnError 

func (c *Collector) OnError(f ErrorCallback)

OnError registers a function. Function will be executed if an error occurs during the HTTP request.

func (*Collector) OnHTML 

func (c *Collector) OnHTML(goquerySelector string, f HTMLCallback)

OnHTML registers a function. Function will be executed on every HTML element matched by the GoQuery Selector parameter. GoQuery Selector is a selector used by https://github.com/PuerkitoBio/goquery

func (*Collector) OnHTMLDetach 

func (c *Collector) OnHTMLDetach(goquerySelector string)

OnHTMLDetach deregister a function. Function will not be execute after detached

func (*Collector) OnRequest 

func (c *Collector) OnRequest(f RequestCallback)

OnRequest registers a function. Function will be executed on every request made by the Collector

func (*Collector) OnResponse 

func (c *Collector) OnResponse(f ResponseCallback)

OnResponse registers a function. Function will be executed on every response

func (*Collector) OnScraped 

func (c *Collector) OnScraped(f ScrapedCallback)

OnScraped registers a function. Function will be executed after OnHTML, as a final part of the scraping.

func (*Collector) OnXML 

func (c *Collector) OnXML(xpathQuery string, f XMLCallback)

OnXML registers a function. Function will be executed on every XML element matched by the xpath Query parameter. xpath Query is used by https://github.com/antchfx/xmlquery

func (*Collector) OnXMLDetach 

func (c *Collector) OnXMLDetach(xpathQuery string)

OnXMLDetach deregister a function. Function will not be execute after detached

func (*Collector) Request 

func (c *Collector) Request(method, URL string, requestData []byte, ctx *Context, hdr http.Header) error

Request starts a collector job by creating a custom HTTP request where method, context, headers and request data can be specified. Set requestData, ctx, hdr parameters to nil if you don't want to use them. Valid methods:

  • "GET"
  • "HEAD"
  • "POST"
  • "PUT"
  • "DELETE"
  • "PATCH"
  • "OPTIONS"

func (*Collector) SetCookieJar 

func (c *Collector) SetCookieJar(j http.CookieJar)

SetCookieJar overrides the previously set cookie jar

func (*Collector) SetCookies 

func (c *Collector) SetCookies(URL string, cookies []*http.Cookie) error

SetCookies handles the receipt of the cookies in a reply for the given URL

func (*Collector) SetDebugger 

func (c *Collector) SetDebugger(d debug.Debugger)

SetDebugger attaches a debugger to the collector

func (*Collector) SetProxy 

func (c *Collector) SetProxy(proxyURL string) error

SetProxy sets a proxy for the collector. This method overrides the previously used http.Transport if the type of the transport is not http.RoundTripper. The proxy type is determined by the URL scheme. "http" and "socks5" are supported. If the scheme is empty, "http" is assumed.

func (*Collector) SetProxyFunc 

func (c *Collector) SetProxyFunc(p ProxyFunc)

SetProxyFunc sets a custom proxy setter/switcher function. See built-in ProxyFuncs for more details. This method overrides the previously used http.Transport if the type of the transport is not http.RoundTripper. The proxy type is determined by the URL scheme. "http" and "socks5" are supported. If the scheme is empty, "http" is assumed.

func (*Collector) SetRequestTimeout 

func (c *Collector) SetRequestTimeout(timeout time.Duration)

SetRequestTimeout overrides the default timeout (10 seconds) for this collector

func (*Collector) SetStorage 

func (c *Collector) SetStorage(s storage.Storage) error

SetStorage overrides the default in-memory storage. Storage stores scraping related data like cookies and visited urls

func (*Collector) String 

func (c *Collector) String() string

String is the text representation of the collector. It contains useful debug information about the collector's internals

func (*Collector) UnmarshalRequest 

func (c *Collector) UnmarshalRequest(r []byte) (*Request, error)

UnmarshalRequest creates a Request from serialized data

func (*Collector) Visit 

func (c *Collector) Visit(URL string) error

Visit starts Collector's collecting job by creating a request to the URL specified in parameter. Visit also calls the previously provided callbacks

func (*Collector) Wait 

func (c *Collector) Wait()

Wait returns when the collector jobs are finished

func (*Collector) WithTransport 

func (c *Collector) WithTransport(transport http.RoundTripper)

WithTransport allows you to set a custom http.RoundTripper (transport)

type CollectorOption added in v1.3.0 

type CollectorOption func(*Collector)

A CollectorOption sets an option on a Collector.

func AllowURLRevisit 

func AllowURLRevisit() CollectorOption

AllowURLRevisit instructs the Collector to allow multiple downloads of the same URL

func AllowedDomains 

func AllowedDomains(domains ...string) CollectorOption

AllowedDomains sets the domain whitelist used by the Collector.

func Async 

func Async(a bool) CollectorOption

Async turns on asynchronous network requests.

func CacheDir 

func CacheDir(path string) CollectorOption

CacheDir specifies the location where GET requests are cached as files.

func Debugger 

func Debugger(d debug.Debugger) CollectorOption

Debugger sets the debugger used by the Collector.

func DetectCharset 

func DetectCharset() CollectorOption

DetectCharset enables character encoding detection for non-utf8 response bodies without explicit charset declaration. This feature uses https://github.com/saintfish/chardet

func DisallowedDomains 

func DisallowedDomains(domains ...string) CollectorOption

DisallowedDomains sets the domain blacklist used by the Collector.

func DisallowedURLFilters 

func DisallowedURLFilters(filters ...*regexp.Regexp) CollectorOption

DisallowedURLFilters sets the list of regular expressions which restricts visiting URLs. If any of the rules matches to a URL the request will be stopped.

func ID 

func ID(id uint32) CollectorOption

ID sets the unique identifier of the Collector.

func IgnoreRobotsTxt 

func IgnoreRobotsTxt() CollectorOption

IgnoreRobotsTxt instructs the Collector to ignore any restrictions set by the target host's robots.txt file.

func MaxBodySize 

func MaxBodySize(sizeInBytes int) CollectorOption

MaxBodySize sets the limit of the retrieved response body in bytes.

func MaxDepth 

func MaxDepth(depth int) CollectorOption

MaxDepth limits the recursion depth of visited URLs.

func ParseHTTPErrorResponse 

func ParseHTTPErrorResponse() CollectorOption

ParseHTTPErrorResponse allows parsing responses with HTTP errors

func URLFilters 

func URLFilters(filters ...*regexp.Regexp) CollectorOption

URLFilters sets the list of regular expressions which restricts visiting URLs. If any of the rules matches to a URL the request won't be stopped.

func UserAgent 

func UserAgent(ua string) CollectorOption

UserAgent sets the user agent used by the Collector.

type Context 

type Context struct {
	// contains filtered or unexported fields
}

Context provides a tiny layer for passing data between callbacks

func NewContext 

func NewContext() *Context

NewContext initializes a new Context instance

func (*Context) ForEach 

func (c *Context) ForEach(fn func(k string, v interface{}) interface{}) []interface{}

ForEach iterate context

func (*Context) Get 

func (c *Context) Get(key string) string

Get retrieves a string value from Context. Get returns an empty string if key not found

func (*Context) GetAny 

func (c *Context) GetAny(key string) interface{}

GetAny retrieves a value from Context. GetAny returns nil if key not found

func (*Context) MarshalBinary 

func (c *Context) MarshalBinary() (_ []byte, _ error)

MarshalBinary encodes Context value This function is used by request caching

func (*Context) Put 

func (c *Context) Put(key string, value interface{})

Put stores a value of any type in Context

func (*Context) UnmarshalBinary 

func (c *Context) UnmarshalBinary(_ []byte) error

UnmarshalBinary decodes Context value to nil This function is used by request caching

type ErrorCallback 

type ErrorCallback func(*Response, error)

ErrorCallback is a type alias for OnError callback functions

type HTMLCallback 

type HTMLCallback func(*HTMLElement)

HTMLCallback is a type alias for OnHTML callback functions

type HTMLElement 

type HTMLElement struct {
	// Name is the name of the tag
	Name string
	Text string

	// Request is the request object of the element's HTML document
	Request *Request
	// Response is the Response object of the element's HTML document
	Response *Response
	// DOM is the goquery parsed DOM object of the page. DOM is relative
	// to the current HTMLElement
	DOM *goquery.Selection
	// Index stores the position of the current element within all the elements matched by an OnHTML callback
	Index int
	// contains filtered or unexported fields
}

HTMLElement is the representation of a HTML tag.

func NewHTMLElementFromSelectionNode 

func NewHTMLElementFromSelectionNode(resp *Response, s *goquery.Selection, n *html.Node, idx int) *HTMLElement

NewHTMLElementFromSelectionNode creates a HTMLElement from a goquery.Selection Node.

func (*HTMLElement) Attr 

func (h *HTMLElement) Attr(k string) string

Attr returns the selected attribute of a HTMLElement or empty string if no attribute found

func (*HTMLElement) ChildAttr 

func (h *HTMLElement) ChildAttr(goquerySelector, attrName string) string

ChildAttr returns the stripped text content of the first matching element's attribute.

func (*HTMLElement) ChildAttrs 

func (h *HTMLElement) ChildAttrs(goquerySelector, attrName string) []string

ChildAttrs returns the stripped text content of all the matching element's attributes.

func (*HTMLElement) ChildText 

func (h *HTMLElement) ChildText(goquerySelector string) string

ChildText returns the concatenated and stripped text content of the matching elements.

func (*HTMLElement) ForEach 

func (h *HTMLElement) ForEach(goquerySelector string, callback func(int, *HTMLElement))

ForEach iterates over the elements matched by the first argument and calls the callback function on every HTMLElement match.

func (*HTMLElement) ForEachWithBreak added in v1.1.0 

func (h *HTMLElement) ForEachWithBreak(goquerySelector string, callback func(int, *HTMLElement) bool)

ForEachWithBreak iterates over the elements matched by the first argument and calls the callback function on every HTMLElement match. It is identical to ForEach except that it is possible to break out of the loop by returning false in the callback function. It returns the current Selection object.

func (*HTMLElement) Unmarshal 

func (h *HTMLElement) Unmarshal(v interface{}) error

Unmarshal is a shorthand for colly.UnmarshalHTML

func (*HTMLElement) UnmarshalWithMap added in v1.3.0 

func (h *HTMLElement) UnmarshalWithMap(v interface{}, structMap map[string]string) error

UnmarshalWithMap is a shorthand for colly.UnmarshalHTML, extended to allow maps to be passed in.

type LimitRule 

type LimitRule struct {
	// DomainRegexp is a regular expression to match against domains
	DomainRegexp string
	// DomainRegexp is a glob pattern to match against domains
	DomainGlob string
	// Delay is the duration to wait before creating a new request to the matching domains
	Delay time.Duration
	// RandomDelay is the extra randomized duration to wait added to Delay before creating a new request
	RandomDelay time.Duration
	// Parallelism is the number of the maximum allowed concurrent requests of the matching domains
	Parallelism int
	// contains filtered or unexported fields
}

LimitRule provides connection restrictions for domains. Both DomainRegexp and DomainGlob can be used to specify the included domains patterns, but at least one is required. There can be two kind of limitations:

  • Parallelism: Set limit for the number of concurrent requests to matching domains
  • Delay: Wait specified amount of time between requests (parallelism is 1 in this case)

func (*LimitRule) Init 

func (r *LimitRule) Init() error

Init initializes the private members of LimitRule

func (*LimitRule) Match 

func (r *LimitRule) Match(domain string) bool

Match checks that the domain parameter triggers the rule

type ProxyFunc 

type ProxyFunc func(*http.Request) (*url.URL, error)

ProxyFunc is a type alias for proxy setter functions.

type Request 

type Request struct {
	// URL is the parsed URL of the HTTP request
	URL *url.URL
	// Headers contains the Request's HTTP headers
	Headers *http.Header
	// Ctx is a context between a Request and a Response
	Ctx *Context
	// Depth is the number of the parents of the request
	Depth int
	// Method is the HTTP method of the request
	Method string
	// Body is the request body which is used on POST/PUT requests
	Body []byte
	// ResponseCharacterencoding is the character encoding of the response body.
	// Leave it blank to allow automatic character encoding of the response body.
	// It is empty by default and it can be set in OnRequest callback.
	ResponseCharacterEncoding string
	// ID is the Unique identifier of the request
	ID uint32

	// ProxyURL is the proxy address that handles the request
	ProxyURL string
	// contains filtered or unexported fields
}

Request is the representation of a HTTP request made by a Collector

func (*Request) Abort 

func (r *Request) Abort()

Abort cancels the HTTP request when called in an OnRequest callback

func (*Request) AbsoluteURL 

func (r *Request) AbsoluteURL(u string) string

AbsoluteURL returns with the resolved absolute URL of an URL chunk. AbsoluteURL returns empty string if the URL chunk is a fragment or could not be parsed

func (*Request) Do 

func (r *Request) Do() error

Do submits the request

func (*Request) Marshal 

func (r *Request) Marshal() ([]byte, error)

Marshal serializes the Request

func (*Request) New 

func (r *Request) New(method, URL string, body []byte) (*Request, error)

New creates a new request with the context of the original request

func (*Request) Post 

func (r *Request) Post(URL string, requestData []byte) error

Post continues a collector job by creating a POST request and preserves the Context of the previous request. Post also calls the previously provided callbacks

func (*Request) PostMultipart 

func (r *Request) PostMultipart(URL string, requestData []byte) error

PostMultipart starts a collector job by creating a Multipart POST request with raw binary data. PostMultipart also calls the previously provided. callbacks

func (*Request) PostRaw 

func (r *Request) PostRaw(URL string, requestData []byte) error

PostRaw starts a collector job by creating a POST request with raw binary data. PostRaw preserves the Context of the previous request and calls the previously provided callbacks

func (*Request) Retry 

func (r *Request) Retry() error

Retry submits HTTP request again with the same parameters

func (*Request) Visit 

func (r *Request) Visit(URL string) error

Visit continues Collector's collecting job by creating a request and preserves the Context of the previous request. Visit also calls the previously provided callbacks

type RequestCallback 

type RequestCallback func(*Request)

RequestCallback is a type alias for OnRequest callback functions

type Response 

type Response struct {
	// StatusCode is the status code of the Response
	StatusCode int
	// Body is the content of the Response
	Body []byte
	// Ctx is a context between a Request and a Response
	Ctx *Context
	// Request is the Request object of the response
	Request *Request
	// Headers contains the Response's HTTP headers
	Headers *http.Header
}

Response is the representation of a HTTP response made by a Collector

func (*Response) FileName 

func (r *Response) FileName() string

FileName returns the sanitized file name parsed from "Content-Disposition" header or from URL

func (*Response) Save 

func (r *Response) Save(fileName string) error

Save writes response body to disk

type ResponseCallback 

type ResponseCallback func(*Response)

ResponseCallback is a type alias for OnResponse callback functions

type ScrapedCallback 

type ScrapedCallback func(*Response)

ScrapedCallback is a type alias for OnScraped callback functions

type XMLCallback 

type XMLCallback func(*XMLElement)

XMLCallback is a type alias for OnXML callback functions

type XMLElement 

type XMLElement struct {
	// Name is the name of the tag
	Name string
	Text string

	// Request is the request object of the element's HTML document
	Request *Request
	// Response is the Response object of the element's HTML document
	Response *Response
	// DOM is the DOM object of the page. DOM is relative
	// to the current XMLElement and is either a html.Node or xmlquery.Node
	// based on how the XMLElement was created.
	DOM interface{}
	// contains filtered or unexported fields
}

XMLElement is the representation of a XML tag.

func NewXMLElementFromHTMLNode 

func NewXMLElementFromHTMLNode(resp *Response, s *html.Node) *XMLElement

NewXMLElementFromHTMLNode creates a XMLElement from a html.Node.

func NewXMLElementFromXMLNode 

func NewXMLElementFromXMLNode(resp *Response, s *xmlquery.Node) *XMLElement

NewXMLElementFromXMLNode creates a XMLElement from a xmlquery.Node.

func (*XMLElement) Attr 

func (h *XMLElement) Attr(k string) string

Attr returns the selected attribute of a HTMLElement or empty string if no attribute found

func (*XMLElement) ChildAttr 

func (h *XMLElement) ChildAttr(xpathQuery, attrName string) string

ChildAttr returns the stripped text content of the first matching element's attribute.

func (*XMLElement) ChildAttrs 

func (h *XMLElement) ChildAttrs(xpathQuery, attrName string) []string

ChildAttrs returns the stripped text content of all the matching element's attributes.

func (*XMLElement) ChildText 

func (h *XMLElement) ChildText(xpathQuery string) string

ChildText returns the concatenated and stripped text content of the matching elements.

func (*XMLElement) ChildTexts added in v1.1.0 

func (h *XMLElement) ChildTexts(xpathQuery string) []string

ChildTexts returns an array of strings corresponding to child elements that match the xpath query. Each item in the array is the stripped text content of the corresponding matching child element.

Source Files

View all Source files

Directories

Path Synopsis
_examples
basic
coursera_courses
cryptocoinmarketcap
error_handling
factba.se
google_groups
hackernews_comments
instagram
local_files
login
max_depth
multipart
openedx_courses
parallel
proxy_switcher
queue
random_delay
rate_limit
reddit
request_context
scraper_server
shopify_sitemap
url_filter
xkcd_store
cmd
colly
Package extensions implements various helper addons for Colly
 Package extensions implements various helper addons for Colly

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