#!/usr/bin/env python3 import os import sys MAX_STORAGE_BYTES = 32 def getenv(key, deft): return os.getenv(key) or deft def stdout_writeln(s): sys.stdout.write(s) sys.stdout.write("\n") sys.stdout.flush() def stderr_writeln(s): sys.stderr.write(s) sys.stderr.flush() def byte_length(s): if not isinstance(s, str): return 0 n = 0 for c in s: o = ord(c) if o < 0x80: n += 1 elif o < 0x800: n += 2 elif o < 0x10000: n += 3 else: n += 4 return n def initialize(): if getenv("DB_QVM_INITIALIZED", "unknown") != "true": stderr_writeln("contract is not initialized") return -1 return 0 def construct(): if getenv("DB_QVM_INITIALIZED", "unknown") == "true": stderr_writeln("contract is already initialized") return -1 stdout_writeln("DBW=QVM_INITIALIZED=true") stdout_writeln("DBW=KV_COUNT=0") stdout_writeln("OUT=Key-Value Store initialized") return 0 def get_key_count(): return int(os.environ.get("DB_KV_COUNT", "0")) def get_key_value(key): return os.environ.get("DB_KV_" + key.upper()) def set_key(key, value): if not key or not key.strip(): stderr_writeln("key cannot be empty") sys.exit(1) if value is None: stderr_writeln("value cannot be empty") sys.exit(1) if byte_length(key) > MAX_STORAGE_BYTES: stderr_writeln( "key exceeds 32 bytes (max %d, got %d)" % (MAX_STORAGE_BYTES, byte_length(key)) ) sys.exit(1) if byte_length(value) > MAX_STORAGE_BYTES: stderr_writeln( "value exceeds 32 bytes (max %d, got %d)" % (MAX_STORAGE_BYTES, byte_length(value)) ) sys.exit(1) existing = get_key_value(key) is_new = existing is None stdout_writeln("DBW=KV_" + key.upper() + "=" + value) if is_new: new_count = get_key_count() + 1 stdout_writeln("DBW=KV_COUNT=%d" % new_count) stdout_writeln( "OUT=Created new key '%s' with value '%s'" % (key, value) ) else: stdout_writeln( "OUT=Updated key '%s' from '%s' to '%s'" % (key, existing, value) ) sys.exit(0) def do_get(key): if not key or not key.strip(): stderr_writeln("key cannot be empty") sys.exit(1) if byte_length(key) > MAX_STORAGE_BYTES: stderr_writeln( "key exceeds 32 bytes (max %d, got %d)" % (MAX_STORAGE_BYTES, byte_length(key)) ) sys.exit(1) value = get_key_value(key) if value is None: stdout_writeln("OUT=Key '%s' not found" % key) else: stdout_writeln("OUT=%s=%s" % (key, value)) sys.exit(0) def delete_key(key): if not key or not key.strip(): stderr_writeln("key cannot be empty") sys.exit(1) if byte_length(key) > MAX_STORAGE_BYTES: stderr_writeln( "key exceeds 32 bytes (max %d, got %d)" % (MAX_STORAGE_BYTES, byte_length(key)) ) sys.exit(1) existing = get_key_value(key) if existing is None: stderr_writeln("key '%s' does not exist" % key) sys.exit(1) stdout_writeln("DBW=KV_" + key.upper() + "=") new_count = max(0, get_key_count() - 1) stdout_writeln("DBW=KV_COUNT=%d" % new_count) stdout_writeln( "OUT=Deleted key '%s' (was: '%s')" % (key, existing) ) sys.exit(0) def exists(key): if not key or not key.strip(): stderr_writeln("key cannot be empty") sys.exit(1) if byte_length(key) > MAX_STORAGE_BYTES: stderr_writeln( "key exceeds 32 bytes (max %d, got %d)" % (MAX_STORAGE_BYTES, byte_length(key)) ) sys.exit(1) value = get_key_value(key) ex = value is not None and value != "" stdout_writeln("OUT=%s exists: %s" % (key, ex)) sys.exit(0) def count(): total = get_key_count() stdout_writeln("OUT=Total keys stored: %d" % total) sys.exit(0) def contract(argv): if len(argv) >= 2 and argv[1] == "construct": sys.exit(construct()) ret = initialize() if ret != 0: sys.exit(ret) if len(argv) < 2: stderr_writeln( "No command provided. Available: construct, set, get, delete, exists, count" ) sys.exit(1) cmd = argv[1] if cmd == "set": if len(argv) < 4: stderr_writeln("Usage: set ") sys.exit(1) set_key(argv[2], argv[3]) elif cmd == "get": if len(argv) < 3: stderr_writeln("Usage: get ") sys.exit(1) do_get(argv[2]) elif cmd == "delete": if len(argv) < 3: stderr_writeln("Usage: delete ") sys.exit(1) delete_key(argv[2]) elif cmd == "exists": if len(argv) < 3: stderr_writeln("Usage: exists ") sys.exit(1) exists(argv[2]) elif cmd == "count": count() else: stderr_writeln("Unknown command: %s" % cmd) stderr_writeln( "Available commands: construct, set, get, delete, exists, count" ) sys.exit(1) if __name__ == "__main__": contract(sys.argv)

Contract - 0x369e152f1d5e2A077B37ABB97A47D5cf7d205d78