Add inflation calculator command
4 files changed, 422 insertions(+), 0 deletions(-) A cmd/inflation/.gitignore A cmd/inflation/go.mod A cmd/inflation/go.sum A cmd/inflation/main.go
A cmd/inflation/.gitignore => cmd/inflation/.gitignore +2 -0
A cmd/inflation/go.mod => cmd/inflation/go.mod +27 -0
@@ 0,0 1,27 @@ module git.sr.ht/~mendelmaleh/amazon/cmd/inflation go 1.19 require ( git.sr.ht/~mendelmaleh/amazon v0.0.0-20220828214901-1e3464112a96 github.com/gocolly/colly/v2 v2.1.0 github.com/jszwec/csvutil v1.7.1 ) require ( github.com/PuerkitoBio/goquery v1.8.0 // indirect github.com/andybalholm/cascadia v1.3.1 // indirect github.com/antchfx/htmlquery v1.2.5 // indirect github.com/antchfx/xmlquery v1.3.12 // indirect github.com/antchfx/xpath v1.2.1 // indirect github.com/gobwas/glob v0.2.3 // indirect github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect github.com/golang/protobuf v1.5.2 // indirect github.com/kennygrant/sanitize v1.2.4 // indirect github.com/saintfish/chardet v0.0.0-20120816061221-3af4cd4741ca // indirect github.com/temoto/robotstxt v1.1.2 // indirect golang.org/x/net v0.0.0-20220826154423-83b083e8dc8b // indirect golang.org/x/text v0.3.7 // indirect google.golang.org/appengine v1.6.7 // indirect google.golang.org/protobuf v1.28.1 // indirect )
A cmd/inflation/go.sum => cmd/inflation/go.sum +163 -0
@@ 0,0 1,163 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= git.sr.ht/~mendelmaleh/amazon v0.0.0-20220530073026-b354f49f572b h1:49bYNEWJLiJgsG5W3VUDdrOMJ+ps14aNaaJ0Nc0nCGU= git.sr.ht/~mendelmaleh/amazon v0.0.0-20220530073026-b354f49f572b/go.mod h1:0Q3s/LLdLtf6ZqbH/as4I1mcKoCco5h8AX9jJfi4vq4= git.sr.ht/~mendelmaleh/amazon v0.0.0-20220828214901-1e3464112a96 h1:7JQLjgAwvt4WJ/h51kE2Qn2jETBA2SKKcjnLu5DIpgg= git.sr.ht/~mendelmaleh/amazon v0.0.0-20220828214901-1e3464112a96/go.mod h1:0Q3s/LLdLtf6ZqbH/as4I1mcKoCco5h8AX9jJfi4vq4= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/PuerkitoBio/goquery v1.5.1 h1:PSPBGne8NIUWw+/7vFBV+kG2J/5MOjbzc7154OaKCSE= github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc= github.com/PuerkitoBio/goquery v1.8.0 h1:PJTF7AmFCFKk1N6V6jmKfrNH9tV5pNE6lZMkG0gta/U= github.com/PuerkitoBio/goquery v1.8.0/go.mod h1:ypIiRMtY7COPGk+I/YbZLbxsxn9g5ejnI2HSMtkjZvI= github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y= github.com/andybalholm/cascadia v1.2.0/go.mod h1:YCyR8vOZT9aZ1CHEd8ap0gMVm2aFgxBp0T0eFw1RUQY= github.com/andybalholm/cascadia v1.3.1 h1:nhxRkql1kdYCc8Snf7D5/D3spOX+dBgjA6u8x004T2c= github.com/andybalholm/cascadia v1.3.1/go.mod h1:R4bJ1UQfqADjvDa4P6HZHLh/3OxWWEqc0Sk8XGwHqvA= github.com/antchfx/htmlquery v1.2.3 h1:sP3NFDneHx2stfNXCKbhHFo8XgNjCACnU/4AO5gWz6M= github.com/antchfx/htmlquery v1.2.3/go.mod h1:B0ABL+F5irhhMWg54ymEZinzMSi0Kt3I2if0BLYa3V0= github.com/antchfx/htmlquery v1.2.5 h1:1lXnx46/1wtv1E/kzmH8vrfMuUKYgkdDBA9pIdMJnk4= github.com/antchfx/htmlquery v1.2.5/go.mod h1:2MCVBzYVafPBmKbrmwB9F5xdd+IEgRY61ci2oOsOQVw= github.com/antchfx/xmlquery v1.2.4 h1:T/SH1bYdzdjTMoz2RgsfVKbM5uWh3gjDYYepFqQmFv4= github.com/antchfx/xmlquery v1.2.4/go.mod h1:KQQuESaxSlqugE2ZBcM/qn+ebIpt+d+4Xx7YcSGAIrM= github.com/antchfx/xmlquery v1.3.12 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A cmd/inflation/main.go => cmd/inflation/main.go +230 -0
@@ 0,0 1,230 @@ package main import ( "fmt" "log" "net/url" "os" "path" "sort" "sync" "time" "github.com/gocolly/colly/v2" "github.com/jszwec/csvutil" "git.sr.ht/~mendelmaleh/amazon" ) const ( baseurl = "https://amazon.com/dp/" selector = "#corePriceDisplay_desktop_feature_div span.a-price.reinventPricePriceToPayMargin span.a-offscreen" ) func fmtdate(t time.Time) string { return t.Format("2006-01-02") } func fmtcents(c int, sign bool) string { whole := c / 100 cents := c % 100 if cents < 0 { cents *= -1 } if sign { return fmt.Sprintf("%+d.%.2d", whole, cents) } return fmt.Sprintf("%d.%.2d", whole, cents) } func Currency(s string) (c amazon.Currency) { c.UnmarshalText([]byte(s)) return } type Item struct { amazon.Item Done bool NewPrice amazon.Currency } type Result struct { URL *url.URL Price amazon.Currency Error error } func (r Result) ID() string { return path.Base(r.URL.Path) } func (r Result) String() string { return fmt.Sprintf("%s, %d, %v", r.ID(), r.Price.Cents, r.Error) } func main() { var wg sync.WaitGroup defer wg.Wait() // scraper setup c := colly.NewCollector( colly.Async(), colly.CacheDir("cache"), // colly.Debugger(&debug.LogDebugger{}), ) defer c.Wait() if err := c.Limit(&colly.LimitRule{ DomainGlob: "*", Delay: time.Second, RandomDelay: time.Second, }); err != nil { log.Fatal("error setting collector limit:", err) } // errors errors := make(chan error) go func() { for i := 0; true; i++ { err := <-errors log.Println(i, err) } }() // results results := make(chan Result) c.OnHTML(selector, func(e *colly.HTMLElement) { wg.Add(1) results <- Result{URL: e.Request.URL, Price: Currency(e.Text)} }) c.OnError(func(resp *colly.Response, err error) { wg.Add(1) results <- Result{URL: resp.Request.URL, Error: err} }) var mx sync.Mutex items := make(map[string]Item) go func() { for { res := <-results id := res.ID() if res.Error != nil { log.Printf("error visiting %q: %s", id, res.Error.Error()) wg.Done() continue } mx.Lock() // only add new items, skip duplicate results if item := items[id]; !item.Done { item.Done = true item.NewPrice = res.Price items[id] = item } mx.Unlock() wg.Done() } }() // parse export file, err := os.ReadFile("items.csv") if err != nil { log.Fatal("error reading file:", err) } var raw []amazon.Item if err := csvutil.Unmarshal(file, &raw); err != nil { log.Fatal("error unmarshaling items:", err) } // dispatch for _, v := range raw { // only 2021 items if y, _, _ := v.Date.Time.Date(); y != 2021 { continue } // skip non-new items and gift cards if v.Condition != "new" || v.Category == "GIFT_CARD" { continue } // this isn't fair if v.Category == "COMPUTER_PROCESSOR" { continue } mx.Lock() // only add new items, skip duplicates if _, ok := items[v.AsinIsbn]; !ok { items[v.AsinIsbn] = Item{Item: v} } mx.Unlock() c.Visit(baseurl + v.AsinIsbn) } c.Wait() // scraper wg.Wait() // processor // statistics var fails int for k, v := range items { if !v.Done { fails++ delete(items, k) } } fmt.Printf("%d successful items, %d failed items\n", len(items), fails) sorted, i := make([]Item, len(items)), 0 for _, v := range items { sorted[i] = v i++ } sort.Slice(sorted, func(i, j int) bool { return sorted[i].Date.Before(sorted[j].Date.Time) }) var prev, now int for _, v := range sorted { old := v.PurchasePricePerUnit.Cents cur := v.NewPrice.Cents prev += old now += cur /* fmt.Printf( "%d:\t%s\t%s\told: %s\tnew: %s\tdiff: %s\t%s\n", i, v.AsinIsbn, fmtdate(v.Date.Time), fmtcents(old, false), fmtcents(cur, false), fmtcents(cur-old, true), v.Category, ) */ } fmt.Println(fmtcents(prev, false), "total 2021") fmt.Println(fmtcents(now, false), "total now") fmt.Printf("%s (%+d%%) difference\n", fmtcents(now-prev, true), (now-prev)*100/prev) }