moth/cmd/mothd/providercommand.go

134 lines
3.5 KiB
Go

// Provides a Puzzle interface that runs a command for each request
package main
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"log"
"os"
"os/exec"
"sort"
"strconv"
"strings"
"time"
"github.com/dirtbags/moth/v4/pkg/transpile"
)
// ProviderCommand specifies a command to run for the puzzle API
type ProviderCommand struct {
Path string
Args []string
}
// Inventory runs with "action=inventory", and parses the output into a category list.
func (pc ProviderCommand) Inventory() (inv []Category) {
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
cmd := exec.CommandContext(ctx, pc.Path, pc.Args...)
cmd.Env = os.Environ()
cmd.Env = append(cmd.Env, "ACTION=inventory")
stdout, err := cmd.Output()
if err != nil {
log.Print(err)
return
}
for _, line := range strings.Split(string(stdout), "\n") {
line = strings.TrimSpace(line)
if line == "" {
continue
}
parts := strings.Split(line, " ")
if len(parts) < 2 {
log.Println("Skipping misformatted line:", line)
continue
}
name := parts[0]
puzzles := make([]int, 0, 10)
for _, pointsString := range parts[1:] {
points, err := strconv.Atoi(pointsString)
if err != nil {
log.Println(err)
continue
}
puzzles = append(puzzles, points)
}
sort.Ints(puzzles)
inv = append(inv, Category{name, puzzles})
}
return
}
// NullReadSeekCloser wraps a no-op Close method around an io.ReadSeeker.
type NullReadSeekCloser struct {
io.ReadSeeker
}
// Close does nothing.
func (f NullReadSeekCloser) Close() error {
return nil
}
// Open passes its arguments to the command with "action=open".
func (pc ProviderCommand) Open(cat string, points int, path string) (ReadSeekCloser, time.Time, error) {
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
cmd := exec.CommandContext(ctx, pc.Path, pc.Args...)
cmd.Env = os.Environ()
cmd.Env = append(cmd.Env, "ACTION=open")
cmd.Env = append(cmd.Env, "CAT="+cat)
cmd.Env = append(cmd.Env, "POINTS="+strconv.Itoa(points))
cmd.Env = append(cmd.Env, "FILENAME="+path)
stdoutBytes, err := cmd.Output()
stdout := NullReadSeekCloser{bytes.NewReader(stdoutBytes)}
now := time.Now()
return stdout, now, err
}
// CheckAnswer passes its arguments to the command with "action=answer".
// If the command exits successfully and sends "correct" to stdout,
// nil is returned.
func (pc ProviderCommand) CheckAnswer(cat string, points int, answer string) (bool, error) {
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
cmd := exec.CommandContext(ctx, pc.Path, pc.Args...)
cmd.Env = os.Environ()
cmd.Env = append(cmd.Env, "ACTION=answer")
cmd.Env = append(cmd.Env, "CAT="+cat)
cmd.Env = append(cmd.Env, "POINTS="+strconv.Itoa(points))
cmd.Env = append(cmd.Env, "ANSWER="+answer)
stdout, err := cmd.Output()
if ee, ok := err.(*exec.ExitError); ok {
log.Printf("WARNING: %s: %s", pc.Path, string(ee.Stderr))
return false, err
} else if err != nil {
return false, err
}
ans := transpile.AnswerResponse{}
if err := json.Unmarshal(stdout, &ans); err != nil {
return false, err
}
return ans.Correct, nil
}
// Mothball just returns an error
func (pc ProviderCommand) Mothball(cat string) (*bytes.Reader, error) {
return nil, fmt.Errorf("can't package a command-generated category")
}
// Maintain does nothing: a command puzzle ProviderCommand has no housekeeping
func (pc ProviderCommand) Maintain(updateInterval time.Duration) {
}