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input.go
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package aocutil
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"log"
"math/big"
"net/http"
"os"
"strconv"
"strings"
)
// Input keeps track of your session ID so it can make requests.
type Input struct {
sessionID *string
}
// NewInputFromFile makes an Input instance using the entire contents of file f
// as the session key (minus any leading or trailing whitespace).
func NewInputFromFile(f string) (*Input, error) {
b, err := os.ReadFile(f)
if err != nil {
return nil, err
}
sid := strings.TrimSpace(string(b))
return &Input{sessionID: &sid}, nil
}
// Reader returns an io.ReadCloser of the input. This must be closed when done.
func (i *Input) Reader(year, day int) (io.ReadCloser, error) {
fn := fmt.Sprintf("%d_%d.txt", year, day)
f, err := os.Open(fn)
if errors.Is(err, os.ErrNotExist) {
log.Println("Not cached, fetching", year, day)
// fetch
rc, err := i.fetch(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
// save to disk
data, err := io.ReadAll(rc)
if err != nil {
return nil, err
}
log.Println("Saving to disk")
if err = os.WriteFile(fn, data, 0644); err != nil {
// don't fail on save fail - we still have the data
log.Println("Could not save input to disk:", err)
}
// we already have data in memory
return io.NopCloser(bytes.NewReader(data)), nil
} else if err != nil {
return nil, err
} else {
log.Println("Using cached data", year, day)
return f, nil
}
}
func (i *Input) fetch(year, day int) (io.ReadCloser, error) {
r, err := http.NewRequest("GET",
fmt.Sprintf("https://adventofcode.com/%d/day/%d/input", year, day), nil)
if err != nil {
return nil, err
}
r.AddCookie(&http.Cookie{
Name: "session",
Value: *i.sessionID,
})
s, err := http.DefaultClient.Do(r)
if err != nil {
return nil, err
}
if s.StatusCode != 200 {
defer s.Body.Close()
body, err := io.ReadAll(s.Body)
if err != nil {
return nil, err
}
return nil, errors.New(string(body))
}
return s.Body, nil
}
// Bytes returns the entire input as a byte array.
func (i *Input) Bytes(year, day int) ([]byte, error) {
rc, err := i.Reader(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
return io.ReadAll(rc)
}
// Strings treats each line of the input as separate and returns them in an
// array.
func (i *Input) Strings(year, day int) ([]string, error) {
rc, err := i.Reader(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
strs := make([]string, 0)
sc := bufio.NewScanner(rc)
for sc.Scan() {
strs = append(strs, sc.Text())
}
return strs, nil
}
// Ints treats each line of the input as an integer and returns them in an
// array.
func (i *Input) Ints(year, day int) ([]int, error) {
rc, err := i.Reader(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
ints := make([]int, 0)
sc := bufio.NewScanner(rc)
for sc.Scan() {
i, err := strconv.Atoi(sc.Text())
if err != nil {
return ints, fmt.Errorf("At index %d: %w", len(ints), err)
}
ints = append(ints, i)
}
return ints, nil
}
// Int64s treats each line of the input as an integer and returns them in an
// array. This allows reading numbers in different bases; treat base according
// to strconv.ParseInt.
func (i *Input) Int64s(year, day int, base int) ([]int64, error) {
rc, err := i.Reader(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
ints := make([]int64, 0)
sc := bufio.NewScanner(rc)
for sc.Scan() {
i, err := strconv.ParseInt(sc.Text(), base, 64)
if err != nil {
return ints, fmt.Errorf("At index %d: %w", len(ints), err)
}
ints = append(ints, i)
}
return ints, nil
}
// Floats treats each line of the input as a floating point number and returns
// them in an array.
func (i *Input) Floats(year, day int) ([]float64, error) {
rc, err := i.Reader(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
floats := make([]float64, 0)
sc := bufio.NewScanner(rc)
for sc.Scan() {
f, err := strconv.ParseFloat(sc.Text(), 64)
if err != nil {
return floats, fmt.Errorf("At index %d: %w", len(floats), err)
}
floats = append(floats, f)
}
return floats, nil
}
// BigInts treats each line of the input as an integer and returns them in an
// array. This allows reading numbers in different bases; treat base according
// to strconv.ParseInt.
func (i *Input) BigInts(year, day int, base int) ([]*big.Int, error) {
rc, err := i.Reader(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
ints := make([]*big.Int, 0)
sc := bufio.NewScanner(rc)
for sc.Scan() {
s := sc.Text()
z := new(big.Int)
_, ok := z.SetString(s, base)
if !ok {
return ints, fmt.Errorf("At index %d: could not parse %s", len(ints), s)
}
ints = append(ints, z)
}
return ints, nil
}
// BigFloats treats each line of the input as a floating point number and
// returns them in an array.
func (i *Input) BigFloats(year, day int) ([]*big.Float, error) {
rc, err := i.Reader(year, day)
if err != nil {
return nil, err
}
defer rc.Close()
floats := make([]*big.Float, 0)
sc := bufio.NewScanner(rc)
for sc.Scan() {
s := sc.Text()
z := new(big.Float)
_, ok := z.SetString(s)
if !ok {
return floats, fmt.Errorf("At index %d: could not parse %s", len(floats), s)
}
floats = append(floats, z)
}
return floats, nil
}