commit 050694c4f240f4fcb92ce4c57cec9c9b846383aa Author: Drew DeVault Date: Fri Jul 8 19:46:11 2022 +0200 Initial commit diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..dba13ed --- /dev/null +++ b/COPYING @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM +IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF +ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/cmd/sh-index/main.go b/cmd/sh-index/main.go new file mode 100644 index 0000000..67f96d9 --- /dev/null +++ b/cmd/sh-index/main.go @@ -0,0 +1,22 @@ +package main + +import ( + "database/sql" + "log" + "os" + + _ "github.com/lib/pq" + + "git.sr.ht/~sircmpwn/searchhut/crawler" +) + +func main() { + connstr := os.Args[1] + domain := os.Args[2] + db, err := sql.Open("postgres", connstr) + if err != nil { + log.Fatal(err) + } + crawler := crawler.NewCrawler(db, domain) + crawler.Crawl() +} diff --git a/crawler/crawler.go b/crawler/crawler.go new file mode 100644 index 0000000..7af6e70 --- /dev/null +++ b/crawler/crawler.go @@ -0,0 +1,109 @@ +package crawler + +import ( + "context" + "database/sql" + "fmt" + "log" + "net/http" + "net/url" + "time" + + //"github.com/temoto/robotstxt" // TODO + "golang.org/x/net/html" + + "git.sr.ht/~sircmpwn/searchhut/database" +) + +type Crawler struct { + Client *http.Client + Domain string + DomainID int + Delay time.Duration + + db *sql.DB + seen map[string]struct{} + schedule []*url.URL +} + +func NewCrawler(db *sql.DB, domain string) *Crawler { + var domainID int + row := db.QueryRow(`SELECT id FROM domain WHERE hostname = $1`, domain) + if err := row.Scan(&domainID); err != nil { + log.Fatal(err) + } + + client := &http.Client{ + Timeout: 5 * time.Second, + } + + return &Crawler{ + Client: client, + Domain: domain, + DomainID: domainID, + Delay: 1 * time.Second, // TODO: Increase me + + db: db, + seen: make(map[string]struct{}), + } +} + +func (c *Crawler) Crawl() { + log.Printf("Indexing %s (domain %d)", c.Domain, c.DomainID) + ctx := database.Context(context.Background(), c.db) + url, err := url.Parse(fmt.Sprintf("https://%s", c.Domain)) + if err != nil { + panic(err) + } + c.Schedule(url) + for len(c.schedule) != 0 { + next := c.schedule[0] + c.schedule = c.schedule[1:] + if err := c.Index(ctx, next); err != nil { + log.Fatal(err) + } + time.Sleep(c.Delay) + } +} + +func (c *Crawler) Get(ctx context.Context, url *url.URL) (*http.Response, error) { + req, err := http.NewRequestWithContext(ctx, + "GET", url.String(), http.NoBody) + if err != nil { + return nil, err + } + ua := "SearchHut Bot 0.0; https://sr.ht/~sircmpwn/searchhut" + req.Header.Add("User-Agent", ua) + return c.Client.Do(req) +} + +func (c *Crawler) Schedule(url *url.URL) { + if url.User != nil || url.Host != c.Domain || url.Scheme != "https" { + return + } + trimmed := *url + trimmed.RawQuery = "" + trimmed.RawFragment = "" + if _, seen := c.seen[trimmed.String()]; seen { + return + } + c.seen[trimmed.String()] = struct{}{} + c.schedule = append(c.schedule, &trimmed) +} + +func (c *Crawler) ScheduleLinks(from *url.URL, node *html.Node) { + if node.Type == html.ElementNode && node.Data == "a" { + for _, attr := range node.Attr { + if attr.Key == "href" { + url, err := url.Parse(attr.Val) + if err == nil { + c.Schedule(from.ResolveReference(url)) + } + break + } + } + } + for child := node.FirstChild; child != nil; child = child.NextSibling { + c.ScheduleLinks(from, child) + } +} diff --git a/crawler/index.go b/crawler/index.go new file mode 100644 index 0000000..721db40 --- /dev/null +++ b/crawler/index.go @@ -0,0 +1,65 @@ +package crawler + +import ( + "context" + "database/sql" + "log" + "net/url" + + "github.com/go-shiori/go-readability" + + "git.sr.ht/~sircmpwn/searchhut/database" +) + +func (c *Crawler) Index(ctx context.Context, url *url.URL) error { + log.Println(url.String()) + + resp, err := c.Get(ctx, url) + defer resp.Body.Close() + article, err := readability.FromReader(resp.Body, url) + if err != nil { + return err + } + + if article.Node != nil { + c.ScheduleLinks(url, article.Node) + } + + return database.WithTx(ctx, nil, func(tx *sql.Tx) error { + // TODO: add more stuff + _, err := tx.ExecContext(ctx, ` + INSERT INTO page ( + domain_id, + last_index_date, + weight, + crawl_priority, + crawl_delay, + url, + checksum, + title, + author, + excerpt, + fts_vector + ) VALUES ( + $1, now(), 0, 0, '0s'::interval, + $2, $3, $4, $5, $6, + setweight(to_tsvector(coalesce($4, '')), 'A') || + setweight(to_tsvector(coalesce($5, '')), 'A') || + setweight(to_tsvector(coalesce($7, '')), 'B') + ) + ON CONFLICT ON CONSTRAINT page_url_key DO UPDATE SET + last_index_date = now(), + checksum = $3, + title = $4, + author = $5, + excerpt = $6, + -- TODO: Maybe move this to a sub-query + fts_vector = + setweight(to_tsvector(coalesce($4, '')), 'A') || + setweight(to_tsvector(coalesce($5, '')), 'A') || + setweight(to_tsvector(coalesce($7, '')), 'B');`, + c.DomainID, url.String(), []byte{}, article.Title, + article.Byline, article.Excerpt, article.TextContent) + return err + }) +} diff --git a/database/context.go b/database/context.go new file mode 100644 index 0000000..695f100 --- /dev/null +++ b/database/context.go @@ -0,0 +1,64 @@ +package database + +import ( + "context" + "database/sql" + "errors" +) + +var dbCtxKey = &contextKey{"database"} + +type contextKey struct { + name string +} + +func Context(ctx context.Context, db *sql.DB) context.Context { + return context.WithValue(ctx, dbCtxKey, db) +} + +func ForContext(ctx context.Context) (*sql.Conn, error) { + raw, ok := ctx.Value(dbCtxKey).(*sql.DB) + if !ok { + panic(errors.New("Invalid database context")) + } + return raw.Conn(ctx) +} + +func DBForContext(ctx context.Context) *sql.DB { + raw, ok := ctx.Value(dbCtxKey).(*sql.DB) + if !ok { + panic(errors.New("Invalid database context")) + } + return raw +} + +func WithTx(ctx context.Context, opts *sql.TxOptions, fn func(tx *sql.Tx) error) error { + conn, err := ForContext(ctx) + if err != nil { + return err + } + defer conn.Close() + tx, err := conn.BeginTx(ctx, opts) + if err != nil { + return err + } + defer func() { + if r := recover(); r != nil { + tx.Rollback() + panic(r) + } + }() + err = fn(tx) + if err != nil { + err := tx.Rollback() + if err != nil && err != sql.ErrTxDone { + panic(err) + } + } else { + err := tx.Commit() + if err != nil && err != sql.ErrTxDone { + panic(err) + } + } + return err +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..597eae9 --- /dev/null +++ b/go.mod @@ -0,0 +1,16 @@ +module git.sr.ht/~sircmpwn/searchhut + +go 1.18 + +require ( + github.com/andybalholm/cascadia v1.2.0 // indirect + github.com/go-shiori/dom v0.0.0-20210627111528-4e4722cd0d65 // indirect + github.com/go-shiori/go-readability v0.0.0-20220215145315-dd6828d2f09b // indirect + github.com/gogs/chardet v0.0.0-20191104214054-4b6791f73a28 // indirect + github.com/lib/pq v1.10.6 // indirect + github.com/sirupsen/logrus v1.8.1 // indirect + github.com/temoto/robotstxt v1.1.2 // indirect + golang.org/x/net v0.0.0-20210614182718-04defd469f4e // indirect + golang.org/x/sys v0.0.0-20210514084401-e8d321eab015 // indirect + golang.org/x/text v0.3.6 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..6843e8a --- /dev/null +++ b/go.sum @@ -0,0 +1,159 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= +github.com/andybalholm/cascadia v1.2.0 h1:vuRCkM5Ozh/BfmsaTm26kbjm0mIOM3yS5Ek/F5h18aE= +github.com/andybalholm/cascadia v1.2.0/go.mod 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v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74= +gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/schema.sql b/schema.sql new file mode 100644 index 0000000..4756ee6 --- /dev/null +++ b/schema.sql @@ -0,0 +1,25 @@ +CREATE TABLE domain ( + id integer PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY, + hostname text NOT NULL, + authoritative boolean NOT NULL, + tags text[] NOT NULL +); + +CREATE TABLE page ( + id integer PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY, + domain_id integer NOT NULL REFERENCES domain(id), + url text NOT NULL UNIQUE, + weight integer NOT NULL, + checksum bytea NOT NULL, + last_index_date timestamptz NOT NULL, + crawl_priority integer NOT NULL, + crawl_delay interval, + fts_vector tsvector NOT NULL, + title text, + language text, + description text, + author text, + excerpt text +); + +CREATE INDEX idx_page_content ON page USING GIN (fts_vector);