No more unified text output file. Text searches of different kinds go into their own files

README.md

@@ -1,12 +1,12 @@
-# Wecr - simple web crawler 
+# Wecr - versatile WEb CRawler 
 
 ## Overview
 
-Just a simple HTML web spider with no dependencies. It is possible to search for pages with a text on them or for the text itself, extract images, video, audio and save pages that satisfy the criteria along the way. 
+A simple HTML web spider with no dependencies. It is possible to search for pages with a text on them or for the text itself, extract images, video, audio and save pages that satisfy the criteria along the way. 
 
 ## Configuration
 
-The flow of work fully depends on the configuration file. By default `conf.json` is used as a configuration file, but the name can be changed via `-conf` flag. The default configuration is embedded in the program so on the first launch or by simply deleting the file, a new `conf.json` will be created in the same directory as the executable itself unless the `-wDir` (working directory) flag is set to some other value. To see al available flags run `wecr -h`.
+The flow of work fully depends on the configuration file. By default `conf.json` is used as a configuration file, but the name can be changed via `-conf` flag. The default configuration is embedded in the program so on the first launch or by simply deleting the file, a new `conf.json` will be created in the same directory as the executable itself unless the `-wdir` (working directory) flag is set to some other value. To see al available flags run `wecr -h`.
 
 The configuration is split into different branches like `requests` (how requests are made, ie: request timeout, wait time, user agent), `logging` (use logs, output to a file), `save` (output file|directory, save pages or not) or `search` (use regexp, query string) each of which contain tweakable parameters. There are global ones as well such as `workers` (working threads that make requests in parallel) and `depth` (literally, how deep the recursive search should go). The names are simple and self-explanatory so no attribute-by-attribute explanation needed for most of them.
 
@@ -14,6 +14,8 @@ The parsing starts from `initial_pages` and goes deeper while ignoring the pages
 
 Previous versions stored the entire visit queue in memory, resulting in gigabytes of memory usage but as of `v0.2.4` it is possible to offload the queue to the persistent storage via `in_memory_visit_queue` option (`false` by default).
 
+You can change search `query` at **runtime** via web dashboard if `launch_dashboard` is set to `true`
+
 ### Search query
 
 There are some special `query` values:
@@ -31,17 +33,58 @@ When `is_regexp` is enabled, the `query` is treated as a regexp string and pages
 
 By default, if the query is not something of special values all the matches and other data will be outputted to `output.json` file as separate continuous JSON objects, but if `save_pages` is set to `true` and|or `query` is set to `images`, `videos`, `audio`, etc. - the additional contents will be put in the corresponding directories inside `output_dir`, which is neatly created by the executable's side.
 
-The output almost certainly contains some duplicates and is not easy to work with programmatically, so you can use `-extractData` with the output JSON file argument (like `output.json`, which is the default output file name) to extract the actual data, filter out the duplicates and put each entry on its new line in a new text file. 
+The output almost certainly contains some duplicates and is not easy to work with programmatically, so you can use `-extractData` with the output JSON file argument (like `found_text.json`, which is the default output file name for simple text searches) to extract the actual data, filter out the duplicates and put each entry on its new line in a new text file. 
 
 ## Build
 
 If you're on *nix - it's as easy as `make`.
 
-Otherwise - `go build` in the `src` directory to build `wecr`. 
+Otherwise - `go build` in the `src` directory to build `wecr`. No dependencies.
 
 ## Examples
 
 See [page on my website](https://unbewohnte.su/wecr) for some basic examples.
 
+Dump of a basic configuration:
+
+```json
+{
+	"search": {
+		"is_regexp": true,
+		"query": "(sequence to search)|(other sequence)"
+	},
+	"requests": {
+		"request_wait_timeout_ms": 2500,
+		"request_pause_ms": 100,
+		"content_fetch_timeout_ms": 0,
+		"user_agent": ""
+	},
+	"depth": 90,
+	"workers": 30,
+	"initial_pages": [
+		"https://en.wikipedia.org/wiki/Main_Page"
+	],
+	"allowed_domains": [
+		"https://en.wikipedia.org/"
+	],
+	"blacklisted_domains": [
+		""
+	],
+	"in_memory_visit_queue": false,
+	"web_dashboard": {
+		"launch_dashboard": true,
+		"port": 13370
+	},
+	"save": {
+		"output_dir": "scraped",
+		"save_pages": false
+	},
+	"logging": {
+		"output_logs": true,
+		"logs_file": "logs.log"
+	}
+}
+```
+
 ## License
 AGPLv3

src/config/config.go

@@ -48,7 +48,6 @@ type Search struct {
 
 type Save struct {
 	OutputDir string `json:"output_dir"`
-	OutputFile string `json:"output_file"`
 	SavePages bool   `json:"save_pages"`
 }
 
@@ -94,7 +93,6 @@ func Default() *Conf {
 		Save: Save{
 			OutputDir: "scraped",
 			SavePages: false,
-			OutputFile: "scraped.json",
 		},
 		Requests: Requests{
 			UserAgent:             "",

src/main.go

@@ -40,13 +40,14 @@ import (
 	"unbewohnte/wecr/worker"
 )
 
-const version = "v0.3.1"
+const version = "v0.3.2"
 
 const (
-	defaultConfigFile           string = "conf.json"
-	defaultOutputFile           string = "output.json"
-	defaultPrettifiedOutputFile string = "extracted_data.txt"
-	defaultVisitQueueFile       string = "visit_queue.tmp"
+	configFilename               string = "conf.json"
+	prettifiedTextOutputFilename string = "extracted_data.txt"
+	visitQueueFilename           string = "visit_queue.tmp"
+	textOutputFilename           string = "found_text.json"
+	emailsOutputFilename         string = "found_emails.json"
 )
 
 var (
@@ -61,15 +62,10 @@ var (
 	)
 
 	configFile = flag.String(
-		"conf", defaultConfigFile,
+		"conf", configFilename,
 		"Configuration file name to create|look for",
 	)
 
-	outputFile = flag.String(
-		"out", defaultOutputFile,
-		"Output file name to output information into",
-	)
-
 	extractDataFilename = flag.String(
 		"extractData", "",
 		"Set filename for output JSON file and extract data from it, put each entry nicely on a new line in a new file, then exit",
@@ -77,7 +73,6 @@ var (
 
 	workingDirectory string
 	configFilePath   string
-	outputFilePath   string
 )
 
 func init() {
@@ -126,20 +121,17 @@ func init() {
 	// extract data if needed
 	if strings.TrimSpace(*extractDataFilename) != "" {
 		logger.Info("Extracting data from %s...", *extractDataFilename)
-		err := utilities.ExtractDataFromOutput(*extractDataFilename, defaultPrettifiedOutputFile, "\n", false)
+		err := utilities.ExtractDataFromOutput(*extractDataFilename, prettifiedTextOutputFilename, "\n", false)
 		if err != nil {
 			logger.Error("Failed to extract data from %s: %s", *extractDataFilename, err)
 			os.Exit(1)
 		}
-		logger.Info("Outputted \"%s\"", defaultPrettifiedOutputFile)
+		logger.Info("Outputted \"%s\"", prettifiedTextOutputFilename)
 		os.Exit(0)
 	}
 
 	// global path to configuration file
 	configFilePath = filepath.Join(workingDirectory, *configFile)
-
-	// global path to output file
-	outputFilePath = filepath.Join(workingDirectory, *outputFile)
 }
 
 func main() {
@@ -249,7 +241,7 @@ func main() {
 		logger.Warning("User agent is not set. Forced to \"%s\"", conf.Requests.UserAgent)
 	}
 
-	// create output directories and corresponding specialized ones
+	// create output directory and corresponding specialized ones, text output files
 	if !filepath.IsAbs(conf.Save.OutputDir) {
 		conf.Save.OutputDir = filepath.Join(workingDirectory, conf.Save.OutputDir)
 	}
@@ -289,6 +281,20 @@ func main() {
 		return
 	}
 
+	textOutputFile, err := os.Create(filepath.Join(conf.Save.OutputDir, textOutputFilename))
+	if err != nil {
+		logger.Error("Failed to create text output file: %s", err)
+		return
+	}
+	defer textOutputFile.Close()
+
+	emailsOutputFile, err := os.Create(filepath.Join(conf.Save.OutputDir, emailsOutputFilename))
+	if err != nil {
+		logger.Error("Failed to create email addresses output file: %s", err)
+		return
+	}
+	defer emailsOutputFile.Close()
+
 	switch conf.Search.Query {
 	case config.QueryEmail:
 		logger.Info("Looking for email addresses")
@@ -315,14 +321,6 @@ func main() {
 		}
 	}
 
-	// create output file
-	outputFile, err := os.Create(outputFilePath)
-	if err != nil {
-		logger.Error("Failed to create output file: %s", err)
-		return
-	}
-	defer outputFile.Close()
-
 	// create logs if needed
 	if conf.Logging.OutputLogs {
 		if conf.Logging.LogsFile != "" {
@@ -354,14 +352,14 @@ func main() {
 	var visitQueueFile *os.File = nil
 	if !conf.InMemoryVisitQueue {
 		var err error
-		visitQueueFile, err = os.Create(filepath.Join(workingDirectory, defaultVisitQueueFile))
+		visitQueueFile, err = os.Create(filepath.Join(workingDirectory, visitQueueFilename))
 		if err != nil {
 			logger.Error("Could not create visit queue temporary file: %s", err)
 			return
 		}
 		defer func() {
 			visitQueueFile.Close()
-			os.Remove(filepath.Join(workingDirectory, defaultVisitQueueFile))
+			os.Remove(filepath.Join(workingDirectory, visitQueueFilename))
 		}()
 	}
 
@@ -443,13 +441,21 @@ func main() {
 		}()
 	}
 
-	// get text results and write them to the output file (files are handled by each worker separately)
+	// get text text results and write it to the output file (found files are handled by each worker separately)
+	var outputFile *os.File
 	for {
 		result, ok := <-results
 		if !ok {
 			break
 		}
 
+		// as it is possible to change configuration "on the fly" - it's better to not mess up different outputs
+		if result.Search.Query == config.QueryEmail {
+			outputFile = emailsOutputFile
+		} else {
+			outputFile = textOutputFile
+		}
+
 		// each entry in output file is a self-standing JSON object
 		entryBytes, err := json.MarshalIndent(result, " ", "\t")
 		if err != nil {

src/worker/worker.go

@@ -375,7 +375,6 @@ func (w *Worker) Work() {
 					}
 					logger.Info("Found matches: %+v", matches)
 					w.stats.MatchesFound += uint64(len(matches))
-
 					savePage = true
 				}
 			case false:
@@ -384,11 +383,10 @@ func (w *Worker) Work() {
 					w.Results <- web.Result{
 						PageURL: job.URL,
 						Search:  job.Search,
-						Data:    nil,
+						Data:    []string{job.Search.Query},
 					}
 					logger.Info("Found \"%s\" on page", job.Search.Query)
 					w.stats.MatchesFound++
-
 					savePage = true
 				}
 			}