fitter

README

Fitter + Fitter CLI

Fitter - new way for collect information from the API's/Websites

Fitter CLI - small cli command which provide result from Fitter for test/debug/home usage

Fitter Lib - library which provide functional of fitter CLI as a library

Way to collect information

1. Server - parsing response from some API's or http request(usage of http.Client)
2. Browser - emulate real browser using chromium + docker + playwright/cypress and get DOM information

Docker default image: docker.io/zenika/alpine-chrome

Format which can be parsed

1. JSON - parsing JSON to get specific information
2. XML - parsing xml tree to get specific information
3. HTML - parsing dom tree to get specific information
4. XPath - parsing dom tree to get specific information but by xpath

Use like a library

go get github.com/PxyUp/fitter

package main

import (
	"fmt"
	"github.com/PxyUp/fitter/lib"
	"github.com/PxyUp/fitter/pkg/config"
	"log"
	"net/http"
)

func main() {
	res, err := lib.Parse(&config.Item{
		ConnectorConfig: &config.ConnectorConfig{
			ConnectorType: config.Server,
			ResponseType:  config.Json,
			Url:    "https://random-data-api.com/api/appliance/random_appliance",
			ServerConfig: &config.ServerConnectorConfig{
				Method: http.MethodGet,
			},
		},
		Model: &config.Model{
			Type: config.ObjectModel,
			ObjectConfig: &config.ObjectConfig{
				Fields: map[string]*config.Field{
					"my_id": {
						BaseField: &config.BaseField{
							Type: config.Int,
							Path: "id",
						},
					},
					"generated_id": {
						BaseField: &config.BaseField{
							Generated: &config.GeneratedFieldConfig{
								UUID: &config.UUIDGeneratedFieldConfig{},
							},
						},
					},
					"generated_array": {
						ArrayConfig: &config.ArrayConfig{
							RootPath: "@this|@keys",
							ItemConfig: &config.ObjectConfig{
								Field: &config.BaseField{
									Type: config.String,
								},
							},
						},
					},
				},
			},
		},
	}, nil, nil)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(res.ToJson())
}

Output:

{
  "generated_array": ["id","uid","brand","equipment"],
  "my_id": 6000,
  "generated_id": "26b08b73-2f2e-444d-bcf2-dac77ac3130e"
}

How to use Fitter

Download latest version from the release page

or locally:

go run cmd/fitter/main.go --path=./examples/config_api.json

Arguments

1. --path - string[config.yaml] - path for the configuration of the Fitter

How to use Fitter_CLI

Download latest version from the release page

or locally:

go run cmd/cli/main.go --path=./examples/cli/config_cli.json

Arguments

1. --path - string[config.yaml] - path for the configuration of the Fitter_CLI
2. --copy - bool[false] - copy information into clipboard
3. --pretty - bool[true] - make readable result(also affect on copy)
4. --verbose - bool[false] - enable logging

./fitter_cli_${VERSION} --path=./examples/cli/config_cli.json --copy=true

Examples:

1. Server version HackerNews + Quotes + Guardian News - using API + HTML + XPath parsing
2. Chromium version Guardian News + Quotes - using HTML parsing + browser emulation
3. Docker version Docker version: Guardian News + Quotes - using HTML parsing + browser from Docker image
4. Playwright version Playwright version: Guardian News + Quotes - using HTML parsing + browser from Playwright framework
5. Playwright version Playwright version: England Cities + Weather - using HTML + XPath parsing + browser from Playwright framework

Configuration

Connector

It is the way how you fetch the data

type ConnectorConfig struct {
    ResponseType  ParserType              `json:"response_type" yaml:"response_type"`
    ConnectorType Connector               `json:"connector_type" yaml:"connector_type"`
    ServerConfig  *ServerConnectorConfig  `json:"server_config" yaml:"server_config"`
    BrowserConfig *BrowserConnectorConfig `yaml:"browser_config" json:"browser_config"`
    Attempts      uint32                  `json:"attempts" yaml:"attempts"`
    Url           string                  `json:"url" yaml:"url"`
}

• ResponseType - enum["HTML", "json","xpath"] - in which format data comes from the connector
• ConnectorType - enum["server", "browser"] - way how to fetch data
• Attempts - how many attempts to use for fetch data by connector
• Url - define which address to request

Config can be one of:

• ServerConfig - only if type of connector "server"
• BrowserConfig - only if type of connector "browser"

Example:

{
  "response_type": "xpath",
  "connector_type": "browser",
  "attempts": 3,
  "url": "https://openweathermap.org/find?q={PL}",
  "browser_config": {
    "playwright": {
      "timeout": 30,
      "wait": 30,
      "install": false,
      "browser": "Chromium"
    }
  }
}

ServerConnectorConfig

Connector type which fetch data using golang http.Client(server side request like curl)

type ServerConnectorConfig struct {
    Method  string            `json:"method" yaml:"method"`
    Headers map[string]string `yaml:"headers" json:"headers"`
}

• Method - supported all http methods: GET, POST, PUT, DELETE, PATCH, OPTIONS, HEAD
• Headers - predefine headers for using during request

Example:

{
  "method": "GET",
  "url": "https://hacker-news.firebaseio.com/v0/beststories.json?print=pretty&limitToFirst=10&orderBy=%22$key%22"
}

Right now default timeout it is 10 sec.

Environment variables

1. FITTER_HTTP_WORKER - int[1000] - default concurrent HTTP workers

BrowserConnectorConfig

Connector type which emulate fetching of data via browser

type BrowserConnectorConfig struct {
	Chromium   *ChromiumConfig   `json:"chromium" yaml:"chromium"`
	Docker     *DockerConfig     `json:"docker" yaml:"docker"`
	Playwright *PlaywrightConfig `json:"playwright" yaml:"playwright"`
}

Config can be one of:

• Chromium - use local installed Chromium for fetch data
• Docker - use docker as service for spin up container for fetch data
• Playwright - use playwright framework for fetch data

Example:

{
    "url": "https://www.theguardian.com/world",
    "docker": {
      "wait": 10000,
      "image": "docker.io/zenika/alpine-chrome:with-node",
      "entry_point": "chromium-browser",
      "purge": true
    }
}

Chromium

Use locally installed Chromium for fetch the data

type ChromiumConfig struct {
	Path    string   `yaml:"path" json:"path"`
	Timeout uint32   `yaml:"timeout" json:"timeout"`
	Wait    uint32   `yaml:"wait" json:"wait"`
	Flags   []string `yaml:"flags" json:"flags"`
}

• Path - path to binary of Chromium
• Timeout[sec] - timeout for execution of the chromium
• Wait[msec] - timeout of page loading
• Flags - flags for Chromium default: "--headless", "--proxy-auto-detect", "--temp-profile", "--incognito", "--disable-logging", "--disable-gpu"

Example:

{
  "path": "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
  "wait": 10000
}

Docker

Use Docker for spin up container for fetch data

type DockerConfig struct {
	Image       string   `yaml:"image" json:"image"`
	EntryPoint  string   `json:"entry_point" yaml:"entry_point"`
	Timeout     uint32   `yaml:"timeout" json:"timeout"`
	Wait        uint32   `yaml:"wait" json:"wait"`
	Flags       []string `yaml:"flags" json:"flags"`
	Purge       bool     `json:"purge" yaml:"purge"`
	NoPull      bool     `yaml:"no_pull" json:"no_pull"`
	PullTimeout uint32   `yaml:"pull_timeout" json:"pull_timeout"`
}

• Image - image for the docker registry(please provide which register host)
• EntryPoint - cmd which will be run inside container
• Timeout[sec] - timeout for run container(without pulling image)
• Wait[msec] - timeout of page loading (works just for Chromium based containers)
• Flags - cmd arguments for run containers, default for Chromium based: "--no-sandbox","--headless", "--proxy-auto-detect", "--temp-profile", "--incognito", "--disable-logging", "--disable-gpu"
• Purge - should we remove container after work done(like docker rm)
• NoPull - prevent pulling of the image
• PullTimeout - define timeout for pull contains

Environment variables

1. DOCKER_HOST - string - (EnvOverrideHost) to set the URL to the docker server.
2. DOCKER_API_VERSION - string - (EnvOverrideAPIVersion) to set the version of the API to use, leave empty for latest.
3. DOCKER_CERT_PATH - string - (EnvOverrideCertPath) to specify the directory from which to load the TLS certificates (ca.pem, cert.pem, key.pem).
4. DOCKER_TLS_VERIFY - bool - (EnvTLSVerify) to enable or disable TLS verification (off by default)

Example:

{
  "wait": 10000,
  "image": "docker.io/zenika/alpine-chrome:with-node",
  "entry_point": "chromium-browser",
  "purge": true
}

Playwright

Run browsers via playwright framework

type PlaywrightConfig struct {
	Browser    PlaywrightBrowser          `json:"browser" yaml:"browser"`
	Install    bool                       `yaml:"install" json:"install"`
	Timeout    uint32                     `yaml:"timeout" json:"timeout"`
	Wait       uint32                     `yaml:"wait" json:"wait"`
	TypeOfWait *playwright.WaitUntilState `json:"type_of_wait" yaml:"type_of_wait"`
}

• Browser - enum["Chromium", "FireFox", "WebKit"] - which browser to use
• Install - should we install browser
• Timeout[sec] - timeout to run playwright
• Wait[sec] - timeout of page loading
• TypeOfWait - enum["load", "domcontentloaded", "networkidle", "commit"] which state of page we waiting, default is "load"

Example

{
  "timeout": 30,
  "wait": 30,
  "install": false,
  "browser": "Chromium"
}

Model

With model we define result of the scrapping

type Model struct {
	Type         ModelType     `yaml:"type" json:"type"`
	ObjectConfig *ObjectConfig `yaml:"object_config" json:"object_config"`
	ArrayConfig  *ArrayConfig  `json:"array_config" yaml:"array_config"`
}

• Type - enum["object", "array"] - in which format we expect result

Config can be one of:

• ObjectConfig - configuration of object format, only if type "object"
• ArrayConfig - configuration of array format, only if type "array"

Example:

{
  "type": "object",
  "object_config": {}
}

ObjectConfig

Configuration of the object and fields

type ObjectConfig struct {
    Fields      map[string]*Field `json:"fields" yaml:"fields"`
    Field       *BaseField        `json:"field" yaml:"field"`
    ArrayConfig *ArrayConfig      `json:"array_config" yaml:"array_config"`
}

Config can be one of:

• Fields - map of each field definition; key - field name, value - configuration
• Field - used for element of array; fields which will be deserialized like basic type like "string", "int" and etc (used here for case array of basic types)
• ArrayConfig - used for element of array; deserialization array of array

Example:

{
  "fields": {
    "title": {
      "base_field": {
        "type": "string",
        "path": "type"
      }
    }
  }
}

ArrayConfig

Configuration of the array and fields

type ArrayConfig struct {
	RootPath     string             `json:"root_path" yaml:"root_path"`
	ItemConfig   *ObjectConfig      `json:"item_config" yaml:"item_config"`
	StaticConfig *StaticArrayConfig `json:"static_array"  yaml:"static_array"`
}

• RootPath - selector for find root element of the array or repeated element in case of html parsing, size of array will be amount of children element under the root

Config can be one of:

• ItemConfig - configuration of each element of the array
• StaticConfig - configuration of the static array

Example:

{
  "root_path": "#content dt.quote > a",
  "item_config": {
    "field": {
      "type": "string"
    }
  }
}

Field

Common of the field

type Field struct {
	BaseField    *BaseField    `json:"base_field" yaml:"base_field"`
	ObjectConfig *ObjectConfig `yaml:"object_config" yaml:"object_config"`
	ArrayConfig  *ArrayConfig  `json:"array_config" yaml:"array_config"`

	FirstOf []*Field `json:"first_of" yaml:"first_of"`
}

Config can be one of:

• BaseField - fields which will be deserialized like basic type like "string", "int" and etc
• ObjectConfig - in case our field in nested object
• ArrayConfig - in case our field in array
• FirstOf - first not empty resolved field will be selected

Example:

{
  "base_field": {
    "type": "string",
    "path": "div.current-temp span.heading"
  }
}

BaseField

In case we want get some static information or generate new one

type BaseField struct {
	Type FieldType `yaml:"type" json:"type"`
	Path string    `yaml:"path" json:"path"`

	Generated *GeneratedFieldConfig `yaml:"generated" json:"generated"`

	FirstOf []*BaseField `json:"first_of" yaml:"first_of"`
}

• FieldType - enum["null", "boolean", "string", "int","int64","float","float64"] - static field for parse
• Path - selector(relative in case it is array child) for parsing

Config can be one of or empty:

• Generated - field can be generated one which custom configuration
• FirstOf - first not empty resolved field will be selected

Examples

{
  "generated": {
    "uuid": {}
  }
}

{
  "type": "string",
  "path": "text()"
}

GeneratedFieldConfig

Provide functionality of generating field on the flight

type GeneratedFieldConfig struct {
	UUID      *UUIDGeneratedFieldConfig   `yaml:"uuid" json:"uuid"`
	Static    *StaticGeneratedFieldConfig `yaml:"static" json:"static"`
	Formatted *FormattedFieldConfig       `json:"formatted" yaml:"formatted"`
	Model     *ModelField                 `yaml:"model" json:"model"`
}

Config can be one of:

• UUID - generate random UUID V4
• Static - generate static field
• Formatted - format field
• Model - model generated from the other connector and model

Examples:

{
    "uuid": {}
}

https://github.com/PxyUp/fitter/blob/master/examples/cli/config_cli.json#L58

{
    "model": {
      "type": "array",
      "model": {
        "type": "array",
        "array_config": {
          "root_path": "#content dt.quote > a",
          "item_config": {
            "field": {
              "type": "string"
            }
          }
        }
      },
      "connector_config": {
        "response_type": "HTML",
        "connector_type": "browser",
        "attempts": 3,
        "browser_config": {
          "url": "http://www.quotationspage.com/random.php",
          "chromium": {
            "path": "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
            "wait": 10000
          }
        }
      }
    }
}

UUID

Generate random UUID V4 on the flight, can be used for generate uniq id

type UUIDGeneratedFieldConfig struct {
	Regexp string `yaml:"regexp" json:"regexp"`
}

• Regexp - provide matcher which can be used for get part of generated uuid

Static

Generate static field

type StaticGeneratedFieldConfig struct {
	Type  FieldType `yaml:"type" json:"type"`
	Value string    `json:"value" yaml:"value"`
}

• Type - enum["null", "boolean", "string", "int","int64","float","float64"] - type of the field
• Value - string value of the field

Example

{
  "type": "int",
  "value": "65"
}

Formatted Field Config

Generate formatted field which will pass value from parent base field

type FormattedFieldConfig struct {
	Template string `yaml:"template" json:"template"`
}

• Template - template in with placeholder {PL} where parent value will be injected like string

Example: https://github.com/PxyUp/fitter/blob/master/examples/cli/config_cli.json#L98

{
  "template": "https://news.ycombinator.com/item?id={PL}"
}

Model Field

Field type which can be generated on the flight by news model and connector

type ModelField struct {
	// Type of parsing
	ConnectorConfig *ConnectorConfig `yaml:"connector_config" json:"connector_config"`
	// Model of the response
	Model *Model `yaml:"model" json:"model"`

	Type GeneratedFieldType `yaml:"type" json:"type"`
	Path string             `yaml:"path" json:"path"`
}

• ConnectorConfig - which connector to use. Important: URL in the connector can be with inject of the parent value as a string
• Model - configuration of the underhood model
• GeneratedFieldType - enum["null", "boolean", "string", "int","int64","float","float64", "array", "object"] - type of generated field
• Path - in case we cant extract some information from generated field we can use json selector for extract

Examples:

https://github.com/PxyUp/fitter/blob/master/examples/cli/config_cli.json#L60

{
  "type": "array",
  "model": {
    "type": "array",
    "array_config": {
      "root_path": "#content dt.quote > a",
      "item_config": {
        "field": {
          "type": "string"
        }
      }
    }
  }
}

https://github.com/PxyUp/fitter/blob/master/examples/cli/config_weather.json#L37

{
    "type": "string",
    "path": "temp.temp",
    "model": {
      "type": "object",
      "object_config": {
        "fields": {
          "temp": {
            "base_field": {
              "type": "string",
              "path": "//div[@id='forecast_list_ul']//td/b/a/@href",
              "generated": {
                "model": {
                  "type": "string",
                  "model": {
                    "type": "object",
                    "object_config": {
                      "fields": {
                        "temp": {
                          "base_field": {
                            "type": "string",
                            "path": "div.current-temp span.heading"
                          }
                        }
                      }
                    }
                  },
                  "connector_config": {
                    "response_type": "HTML",
                    "connector_type": "browser",
                    "attempts": 4,
                    "url": "https://openweathermap.org{PL}",
                    "browser_config": {
                      "playwright": {
                        "timeout": 30,
                        "wait": 30,
                        "install": false,
                        "browser": "FireFox",
                        "type_of_wait": "networkidle"
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    },
    "connector_config": {
      "response_type": "xpath",
      "connector_type": "browser",
      "attempts": 3,
      "url": "https://openweathermap.org/find?q={PL}",
      "browser_config": {
        "playwright": {
          "timeout": 30,
          "wait": 30,
          "install": false,
          "browser": "Chromium"
        }
      }
    }
}

Static Array Config

Provide static(fixed length) array generation

type StaticArrayConfig struct {
    Items map[uint32]*Field `yaml:"items" json:"items"`
}

• Items - map[uint32]*Field - key is index in array, value is field definition

Example:

{
  "0": {
    "base_field": {
      "type": "string",
      "path": "div.current-temp span.heading"
    }
  }
}

Limits

Provide limitation for prevent DDOS, big usage of memory

type Limits struct {
	HostRequestLimiter HostRequestLimiter `yaml:"host_request_limiter" json:"host_request_limiter"`
	ChromiumInstance   uint32             `yaml:"chromium_instance" json:"chromium_instance"`
	DockerContainers   uint32             `yaml:"docker_containers" json:"docker_containers"`
	PlaywrightInstance uint32             `yaml:"playwright_instance" json:"playwright_instance"`
}

• HostRequestLimiter - map[string]int64 - limitation per host name, key is host, value is amount of parallel request(usage for server connector)
• ChromiumInstance - amount of parallel chromium instance
• DockerContainers - amount of parallel docker instance
• PlaywrightInstance - amount of parallel playwright instance

https://github.com/PxyUp/fitter/blob/master/examples/cli/config_cli.json#L2

{
  "limits": {
    "host_request_limiter": {
      "hacker-news.firebaseio.com": 5
    },
    "chromium_instance": 3,
    "docker_containers": 3,
    "playwright_instance": 3
  }
}

Roadmap

1. Add browser scenario for preparing, after parsing
2. Add scrolling support for scenario
3. Add pagination support for scenario
4. Add notification methods for Fitter: Webhook/Queue