pre cw with probe and a bunch script to read game behavior

internal/common/currency_wars_commands.go

@@ -0,0 +1,97 @@
+package common
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+)
+
+// Commands are separate from the run revision. The live game session applies
+// them only during Preparation, so a web command cannot invalidate settlement.
+type CurrencyWarsCommand struct {
+	ID    string `json:"id"`
+	UID   uint32 `json:"uid"`
+	RunID uint32 `json:"run_id"`
+	Field string `json:"field"`
+	Value uint32 `json:"value"`
+}
+
+func ReadCurrencyWarsCommands() ([]CurrencyWarsCommand, error) {
+	root, err := readCurrencyWarsPersistentRoot()
+	if err != nil {
+		return nil, err
+	}
+	var commands []CurrencyWarsCommand
+	if raw, ok := root["currency_wars_commands"]; ok {
+		err = json.Unmarshal(raw, &commands)
+	}
+	return commands, err
+}
+
+func QueueCurrencyWarsCommand(uid, runID uint32, field string, value uint32) (string, error) {
+	if uid == 0 || runID == 0 || (field != "gold" && field != "hp") {
+		return "", fmt.Errorf("invalid CW command")
+	}
+	var nonce [16]byte
+	if _, err := rand.Read(nonce[:]); err != nil {
+		return "", err
+	}
+	id := hex.EncodeToString(nonce[:])
+	persistentWriteMu.Lock()
+	defer persistentWriteMu.Unlock()
+	unlock, err := lockPersistentFile()
+	if err != nil {
+		return "", err
+	}
+	defer unlock()
+	root, err := readCurrencyWarsPersistentRoot()
+	if err != nil {
+		return "", err
+	}
+	var commands []CurrencyWarsCommand
+	if raw, ok := root["currency_wars_commands"]; ok {
+		if err = json.Unmarshal(raw, &commands); err != nil {
+			return "", err
+		}
+	}
+	commands = append(commands, CurrencyWarsCommand{ID: id, UID: uid, RunID: runID, Field: field, Value: value})
+	raw, err := json.Marshal(commands)
+	if err != nil {
+		return "", err
+	}
+	root["currency_wars_commands"] = raw
+	return id, writeJSONAtomic("persistent", root)
+}
+
+func AcknowledgeCurrencyWarsCommand(id string) error {
+	persistentWriteMu.Lock()
+	defer persistentWriteMu.Unlock()
+	unlock, err := lockPersistentFile()
+	if err != nil {
+		return err
+	}
+	defer unlock()
+	root, err := readCurrencyWarsPersistentRoot()
+	if err != nil {
+		return err
+	}
+	var commands []CurrencyWarsCommand
+	if raw, ok := root["currency_wars_commands"]; ok {
+		if err = json.Unmarshal(raw, &commands); err != nil {
+			return err
+		}
+	}
+	remaining := commands[:0]
+	for _, c := range commands {
+		if c.ID != id {
+			remaining = append(remaining, c)
+		}
+	}
+	raw, err := json.Marshal(remaining)
+	if err != nil {
+		return err
+	}
+	root["currency_wars_commands"] = raw
+	return writeJSONAtomic("persistent", root)
+}