demo: commit the recording harness (#8)
This commit was merged in pull request #8.
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"""Windows rewind demo. Beats hold for their narration length and log real start times."""
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from __future__ import annotations
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import json, os, sys, time
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from pathlib import Path
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import winrm
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import diagram
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from mcp import ClientSession, StdioServerParameters
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from mcp.client.stdio import stdio_client
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SP = Path(__file__).parent
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CFG = json.loads((SP / "demo_win.json").read_text())
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DUR = json.loads((SP / "vo" / "durations.json").read_text())
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REPO = "/home/justin/github/zerto-ai-rewind"
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MARKS = SP / "marks.jsonl"
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PAD = 0.8 # breath between beats
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RST, BOLD, DIM = "\033[0m", "\033[1m", "\033[2m"
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CYAN, GREEN, RED, YEL, MAG = "\033[36m", "\033[32m", "\033[31m", "\033[33m", "\033[35m"
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T0 = time.time()
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STEP = [0]
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def recovered_bytes(rec: dict) -> bytes:
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"""zerto_recover_file returns the content now, not a path on the MCP host.
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The server may be on another machine, so a path there is of no use here.
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"""
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import base64
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if rec.get("encoding") == "base64":
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return base64.b64decode(rec["content"])
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return rec["content"].encode()
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def w(s=""):
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sys.stdout.write(s + "\n"); sys.stdout.flush()
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def type_out(s, delay=0.018, color=""):
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sys.stdout.write(color)
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for ch in s:
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sys.stdout.write(ch); sys.stdout.flush(); time.sleep(delay)
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sys.stdout.write(RST + "\n"); sys.stdout.flush()
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def begin(key, title=None):
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"""Mark the beat start so the narration can be aligned to it later."""
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t = time.time() - T0
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with MARKS.open("a") as fh:
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fh.write(json.dumps({"key": key, "t": round(t, 3)}) + "\n")
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if title:
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STEP[0] += 1
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w(); w(f"{BOLD}{CYAN}{'=' * 74}{RST}")
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type_out(f" STEP {STEP[0]} {title}", 0.010, BOLD + CYAN)
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w(f"{BOLD}{CYAN}{'=' * 74}{RST}")
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return t
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def hold(start_t, key):
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"""Keep this beat on screen until its narration has finished."""
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want = DUR.get(key, 6.0) + PAD
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spent = (time.time() - T0) - start_t
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if spent < want:
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time.sleep(want - spent)
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def show(payload, keep=None, limit=18):
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if keep:
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payload = {k: payload[k] for k in keep if k in payload}
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for line in json.dumps(payload, indent=2, default=str).splitlines()[:limit]:
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w(f"{DIM} |{RST} {line}")
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_sess = winrm.Session(f"http://{CFG['host']}:5985/wsman",
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auth=(CFG["user"], CFG["password"]), transport="ntlm")
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def guest_ps(ps, label):
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w(f"{YEL} PS {CFG['host']}> {label}{RST}")
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r = _sess.run_ps(ps)
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out = r.std_out.decode(errors="replace").strip()
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for line in out.splitlines():
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w(f"{DIM} |{RST} {line}")
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return out
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async def main():
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import asyncio
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MARKS.unlink(missing_ok=True)
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for n, key in enumerate(("i1", "i2", "i3", "i4"), start=1):
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t = begin(key)
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sys.stdout.write(diagram.frame(n)); sys.stdout.write("\n"); sys.stdout.flush()
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hold(t, key)
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params = StdioServerParameters(
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command=f"{REPO}/.venv/bin/zerto-rewind-mcp",
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env={**os.environ, "ZERTO_REWIND_CONFIG": f"{REPO}/config.json"})
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devnull = open(os.devnull, "w")
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async with stdio_client(params, errlog=devnull) as (r, s):
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async with ClientSession(r, s) as sess:
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t = begin("d1", "Connect to the rewind MCP")
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await sess.initialize()
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tools = await sess.list_tools()
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w(f"{DIM} {len(tools.tools)} tools from zerto_rewind_mcp{RST}")
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for x in tools.tools:
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w(f"{DIM} - {x.name}{RST}")
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hold(t, "d1")
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async def call(name, **args):
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w(f"{MAG} -> MCP call{RST} {BOLD}{name}{RST}")
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for k, v in args.items():
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w(f"{DIM} {k} = {v}{RST}")
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res = await sess.call_tool(name, args)
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return json.loads(res.content[0].text)
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t = begin("d2", "The file the agent is about to break")
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guest_ps(f"Get-Content '{CFG['guest_path']}'", f"Get-Content {CFG['guest_path']}")
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hold(t, "d2")
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t = begin("d3", "zerto_find_protection")
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found = await call("zerto_find_protection", query=CFG["vm_query"])
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show(found, keep=["ok", "outcome", "vm"])
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if not found.get("ok"):
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w(f"{RED} not ok, stopping{RST}"); return 1
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hold(t, "d3")
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t = begin("d4", "zerto_guard_before_mutate")
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guard = await call("zerto_guard_before_mutate", query=CFG["vm_query"],
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change_id=CFG["change_id"], agent="claude",
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action=f"edit {CFG['guest_path']}")
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show(guard, keep=["ok", "tag", "tagged"])
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if not guard.get("ok"):
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w(f"{RED} GUARD FAILED, refusing the change{RST}"); return 1
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tg = guard["tagged"][0]
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t_tag = time.strftime("%H:%M:%S")
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w(f"{GREEN}{BOLD} checkpoint {tg['checkpoint_id']} inserted {t_tag} task={tg['task_state']}{RST}")
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hold(t, "d4")
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t = begin("d5", "Now the agent makes the bad change")
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guest_ps(f"Set-Content -Path '{CFG['guest_path']}' -Value '{CFG['bad_content']}' -Encoding ASCII; "
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f"Get-Content '{CFG['guest_path']}'", f"Set-Content {CFG['guest_path']} ...")
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t_bad = time.strftime("%H:%M:%S")
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w(f"{RED}{BOLD} the good config is gone from the guest ({t_bad}){RST}")
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hold(t, "d5")
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t = begin("d6", "zerto_recover_file without a human yes")
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deny = await call("zerto_recover_file", vpg_identifier=CFG["vpg_id"],
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vm_identifier=CFG["vm_identifier"],
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checkpoint_identifier=tg["checkpoint_id"],
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guest_path=CFG["guest_path"], confirmed=False)
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show(deny)
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w(f"{YEL} refused.{RST}")
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hold(t, "d6")
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t = begin("d7", "Human says yes: FLR from the pre-mutation checkpoint")
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w(f"{BOLD} provenance{RST}")
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w(f" {GREEN}cp {tg['checkpoint_id']} inserted {t_tag}{RST} {DIM}<- guard, BEFORE{RST}")
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w(f" {RED}bad write {t_bad}{RST} {DIM}<- the mutation, AFTER{RST}")
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rec = await call("zerto_recover_file", vpg_identifier=CFG["vpg_id"],
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vm_identifier=CFG["vm_identifier"],
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checkpoint_identifier=tg["checkpoint_id"],
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guest_path=CFG["guest_path"], confirmed=True,
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dest_dir=str(SP / "win_demo_out"))
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show(rec, keep=["ok", "bytes", "flr_path", "unmount"])
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if not rec.get("ok"):
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w(f"{RED} FLR failed{RST}"); return 1
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body = recovered_bytes(rec).decode()
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w(f"{YEL} recovered file:{RST}")
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for line in body.splitlines():
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w(f"{GREEN}{BOLD} | {line}{RST}")
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hold(t, "d7")
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t = begin("d8", "Copy it back to the guest")
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# Ship the recovered bytes verbatim. Set-Content rewrites line
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# endings and appends one, which makes the restored file differ
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# from what Zerto handed back. WriteAllBytes does not.
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import base64
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blob = recovered_bytes(rec)
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b64 = base64.b64encode(blob).decode()
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guest_ps(
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f"[IO.File]::WriteAllBytes('{CFG['guest_path']}',"
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f"[Convert]::FromBase64String('{b64}'));"
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f"Get-Content '{CFG['guest_path']}';"
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f"'md5: ' + (Get-FileHash '{CFG['guest_path']}' -Algorithm MD5).Hash",
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f"WriteAllBytes {CFG['guest_path']} <{len(blob)} recovered bytes>")
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hold(t, "d8")
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t = begin("d9")
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w(); w(f"{BOLD}{YEL} the same checkpoint, bigger blast radius{RST}")
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type_out(" one file -> file level recovery (what you just saw)", 0.012, DIM)
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type_out(" the whole VM -> offsite clone, failover test, or failover", 0.012, DIM)
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hold(t, "d9")
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t = begin("d10")
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w(); w(f"{BOLD}{GREEN}{'=' * 74}{RST}")
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type_out(" REWOUND. The recovery point was the journal.", 0.018, BOLD + GREEN)
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w(f"{BOLD}{GREEN}{'=' * 74}{RST}")
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hold(t, "d10")
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return 0
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import asyncio
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sys.exit(asyncio.run(main()))
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