TheMathemagicians/sevenkeys/main.go

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package main
import (
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"database/sql"
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"encoding/json"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"sevenkeys/database"
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"sevenkeys/database/entities"
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"sevenkeys/database/operations"
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"sevenkeys/scryfall/methods"
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"sevenkeys/scryfall/types"
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"time"
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)
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const CACHE_DIR string = "cache"
const SET_ICON_CACHE_DIR string = CACHE_DIR + "/seticons/"
const SET_ICON_FILE_EXTENSION string = ".svg"
const ALL_CARDS_CACHE_FILENAME = CACHE_DIR + "/all-cards.json"
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func check(err error) {
if err != nil {
log.Fatal(err)
}
}
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func createCacheDirectories() error {
err := os.Mkdir(CACHE_DIR, os.ModePerm)
if err != nil && !os.IsExist(err) {
return err
}
err = os.Mkdir(SET_ICON_CACHE_DIR, os.ModePerm)
if err != nil && !os.IsExist(err) {
return err
}
return nil
}
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func importSets(db *sql.DB, sets []types.Set) error {
for _, set := range sets {
// We're only interested in paper cards, so skip importing
// any sets that were only released in a video game
if set.Digital {
continue
}
log.Println("Importing " + set.Code)
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err := operations.InsertOrUpdateSet(db, set)
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if err != nil {
return err
}
log.Println("Downloading logo for " + set.Code)
response, err := http.Get(set.IconSvgUri)
defer response.Body.Close()
if err != nil {
return err
}
iconFilename := SET_ICON_CACHE_DIR + set.Code + SET_ICON_FILE_EXTENSION
iconFile, err := os.Create(iconFilename)
if err != nil {
return err
}
io.Copy(iconFile, response.Body)
log.Println("Finished importing " + set.Code)
}
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return nil
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}
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func cardsUpdatedSinceCache(db *sql.DB, updatedAtTimestamp time.Time) (bool, error) {
cachedFileTimestamp, err := operations.GetCacheTimestampByType(db, entities.CacheTypeAllCardsBulkData)
if err != nil {
return false, err
}
return updatedAtTimestamp.After(cachedFileTimestamp), nil
}
func cacheAllCardsFile(db *sql.DB, uri string, updatedAtTimestamp time.Time) error {
log.Printf("Downloading bulk card data...")
bulkCardsResponse, err := http.Get(uri)
if err != nil {
return err
}
log.Printf("Downloaded bulk card data.")
log.Printf("Writing card data to cache file...")
cacheFile, err := os.Create(ALL_CARDS_CACHE_FILENAME)
if err != nil {
return err
}
defer bulkCardsResponse.Body.Close()
defer cacheFile.Close()
io.Copy(cacheFile, bulkCardsResponse.Body)
log.Printf("Cache file written.")
log.Printf("Recording timestamp...")
err = operations.InsertOrUpdateCacheTimestampByType(db, entities.CacheTypeAllCardsBulkData, updatedAtTimestamp)
if err != nil {
return err
}
log.Printf("Timestamp recorded.")
return nil
}
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func main() {
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log.Println("Connecting to database...")
db := database.GetDatabaseFromConfig("config.json")
log.Println("Connected.")
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log.Println("Creating cache directories...")
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err := createCacheDirectories()
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check(err)
log.Println("Created cache directories.")
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/*
log.Println("Downloading set data from Scryfall...")
sets, err := methods.GetSets()
check(err)
log.Println("Downloaded set data.")
log.Println("Importing set data...")
err = importSets(db, sets)
check(err)
log.Println("Imported sets.")
*/
log.Println("Downloading bulk data entry...")
allCardsBulkData, err := methods.GetBulkDataByType(types.BulkDataTypeAllCards)
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check(err)
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log.Println("Downloaded bulk data entry.")
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updatedAtTimestamp, err := time.Parse(types.ScryfallTimestampFormat, allCardsBulkData.UpdatedAt)
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check(err)
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updatedAtTimestamp = updatedAtTimestamp.Truncate(time.Second) // Remove the fractional seconds component from the timestamp
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log.Println("Checking for redownload...")
updated, err := cardsUpdatedSinceCache(db, updatedAtTimestamp)
check(err)
if updated {
log.Printf("Bulk data has been updated since last cache, redownloading.")
return
err = cacheAllCardsFile(db, allCardsBulkData.DownloadUri, updatedAtTimestamp)
check(err)
} else {
log.Printf("Bulk data has not been updated. Skipping download.")
}
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log.Printf("Unmarsaling file into slice...")
allCardsBytes, err := ioutil.ReadFile(ALL_CARDS_CACHE_FILENAME)
check(err)
var allCards []types.Card
err = json.Unmarshal(allCardsBytes, &allCards)
check(err)
log.Printf("Unmarshaled file.")
log.Printf("Importing card data into database...")
err = operations.InsertCards(db, allCards)
check(err)
log.Printf("Imported card data.")
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}