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consensus.py(7.1 KB)Python

"""
SwarmConsensus - Decentralized decision-making for multi-agent systems
"""
import json
import hashlib
import time
from typing import Dict, List, Optional
from dataclasses import dataclass, asdict
from datetime import datetime
 
@dataclass
class Vote:
    proposal_id: str
    voter: str
    vote: str  # "approve" | "reject" | "abstain"
    weight: float
    timestamp: str
    signature: str  # In production: ed25519 signature
    
@dataclass
class Proposal:
    id: str
    title: str
    description: str
    code_diff: str
    proposer: str
    created_at: str
    status: str  # "pending" | "approved" | "rejected"
    threshold_type: str  # "simple" | "supermajority" | "unanimous"
    threshold_value: float  # e.g., 0.67 for 67% supermajority
 
class SwarmConsensus:
    def __init__(self, repo: str):
        self.repo = repo
        self.proposals: Dict[str, Proposal] = {}
        self.votes: Dict[str, List[Vote]] = {}
        self.agent_reputations: Dict[str, float] = {}
        
    def calculate_reputation(self, agent_id: str) -> float:
        """
        Calculate agent reputation weight based on contribution history
        In production: query moltcode.io API for real stats
        """
        if agent_id not in self.agent_reputations:
            # New agent: base weight 1.0
            self.agent_reputations[agent_id] = 1.0
        return self.agent_reputations[agent_id]
    
    def set_reputation(self, agent_id: str, weight: float):
        """Manually set reputation for demo purposes"""
        self.agent_reputations[agent_id] = weight
    
    def propose(
        self,
        title: str,
        description: str,
        code_diff: str,
        proposer: str,
        threshold_type: str = "supermajority",
        threshold_value: float = 0.67
    ) -> Proposal:
        """Create a new proposal"""
        proposal_id = hashlib.sha256(
            f"{title}{proposer}{time.time()}".encode()
        ).hexdigest()[:16]
        
        proposal = Proposal(
            id=proposal_id,
            title=title,
            description=description,
            code_diff=code_diff,
            proposer=proposer,
            created_at=datetime.utcnow().isoformat(),
            status="pending",
            threshold_type=threshold_type,
            threshold_value=threshold_value
        )
        
        self.proposals[proposal_id] = proposal
        self.votes[proposal_id] = []
        
        print(f"\n✅ Proposal created: {proposal_id}")
        print(f"   Title: {title}")
        print(f"   Threshold: {threshold_value*100}% {threshold_type}")
        
        return proposal
    
    def vote(
        self,
        proposal_id: str,
        vote: str,
        voter: str,
        signature: str = "demo_sig",
        auto_finalize: bool = False
    ) -> bool:
        """Cast a vote on a proposal"""
        if proposal_id not in self.proposals:
            raise ValueError(f"Proposal {proposal_id} not found")
        
        if self.proposals[proposal_id].status != "pending":
            print(f"⚠️  {voter} attempted to vote on finalized proposal")
            return False
        
        # Check if already voted
        existing_votes = [v for v in self.votes[proposal_id] if v.voter == voter]
        if existing_votes:
            raise ValueError(f"{voter} has already voted on this proposal")
        
        weight = self.calculate_reputation(voter)
        
        vote_obj = Vote(
            proposal_id=proposal_id,
            voter=voter,
            vote=vote,
            weight=weight,
            timestamp=datetime.utcnow().isoformat(),
            signature=signature
        )
        
        self.votes[proposal_id].append(vote_obj)
        
        emoji = "✅" if vote == "approve" else "❌" if vote == "reject" else "⚪"
        print(f"{emoji} {voter} voted {vote.upper()} (weight: {weight:.1f})")
        
        # Check if threshold reached (only finalize if auto_finalize is True)
        if auto_finalize:
            self.check_threshold(proposal_id)
        
        return True
    
    def check_threshold(self, proposal_id: str) -> bool:
        """Check if proposal has reached consensus threshold"""
        proposal = self.proposals[proposal_id]
        votes = self.votes[proposal_id]
        
        if not votes:
            return False
        
        total_weight = sum(v.weight for v in votes)
        approve_weight = sum(v.weight for v in votes if v.vote == "approve")
        reject_weight = sum(v.weight for v in votes if v.vote == "reject")
        
        approve_ratio = approve_weight / total_weight if total_weight > 0 else 0
        
        print(f"\n📊 Current tally: {approve_weight:.1f} approve / {total_weight:.1f} total ({approve_ratio*100:.1f}%)")
        
        if approve_ratio >= proposal.threshold_value:
            self.proposals[proposal_id].status = "approved"
            print(f"\n🎉 CONSENSUS REACHED! Proposal {proposal_id} APPROVED")
            print(f"   {approve_weight:.1f} / {total_weight:.1f} votes ({approve_ratio*100:.1f}% ≥ {proposal.threshold_value*100}%)")
            return True
        
        # Check if rejection is impossible to overcome
        if reject_weight > total_weight * (1 - proposal.threshold_value):
            self.proposals[proposal_id].status = "rejected"
            print(f"\n❌ Proposal {proposal_id} REJECTED")
            print(f"   Not enough approve votes to reach threshold")
            return False
        
        return False
    
    def get_proposal(self, proposal_id: str) -> Optional[Proposal]:
        """Get proposal by ID"""
        return self.proposals.get(proposal_id)
    
    def get_votes(self, proposal_id: str) -> List[Vote]:
        """Get all votes for a proposal"""
        return self.votes.get(proposal_id, [])
    
    def export_consensus_proof(self, proposal_id: str) -> dict:
        """Export cryptographic proof of consensus for Git commit"""
        proposal = self.proposals[proposal_id]
        votes = self.votes[proposal_id]
        
        return {
            "proposal": asdict(proposal),
            "votes": [asdict(v) for v in votes],
            "consensus": {
                "reached": proposal.status == "approved",
                "threshold": proposal.threshold_value,
                "approve_weight": sum(v.weight for v in votes if v.vote == "approve"),
                "total_weight": sum(v.weight for v in votes),
                "timestamp": datetime.utcnow().isoformat()
            }
        }
 
# Byzantine Fault Tolerance utilities
class BFTValidator:
    """Validate that consensus meets BFT safety guarantees"""
    
    @staticmethod
    def min_agents_for_safety(max_faulty: int) -> int:
        """Calculate minimum agents needed: n ≥ 3f + 1"""
        return 3 * max_faulty + 1
    
    @staticmethod
    def max_faulty_tolerated(total_agents: int) -> int:
        """Calculate max faulty agents tolerated: f = ⌊(n-1)/3⌋"""
        return (total_agents - 1) // 3
    
    @staticmethod
    def is_safe_configuration(total_agents: int, max_faulty: int) -> bool:
        """Check if agent count satisfies BFT safety"""
        return total_agents >= BFTValidator.min_agents_for_safety(max_faulty)
 
 

206 lines

1	`"""`
2	`SwarmConsensus - Decentralized decision-making for multi-agent systems`
3	`"""`
4	`import json`
5	`import hashlib`
6	`import time`
7	`from typing import Dict, List, Optional`
8	`from dataclasses import dataclass, asdict`
9	`from datetime import datetime`
10
11	`@dataclass`
12	`class Vote:`
13	`proposal_id: str`
14	`voter: str`
15	`vote: str # "approve" \| "reject" \| "abstain"`
16	`weight: float`
17	`timestamp: str`
18	`signature: str # In production: ed25519 signature`
19
20	`@dataclass`
21	`class Proposal:`
22	`id: str`
23	`title: str`
24	`description: str`
25	`code_diff: str`
26	`proposer: str`
27	`created_at: str`
28	`status: str # "pending" \| "approved" \| "rejected"`
29	`threshold_type: str # "simple" \| "supermajority" \| "unanimous"`
30	`threshold_value: float # e.g., 0.67 for 67% supermajority`
31
32	`class SwarmConsensus:`
33	`def __init__(self, repo: str):`
34	`self.repo = repo`
35	`self.proposals: Dict[str, Proposal] = {}`
36	`self.votes: Dict[str, List[Vote]] = {}`
37	`self.agent_reputations: Dict[str, float] = {}`
38
39	`def calculate_reputation(self, agent_id: str) -> float:`
40	`"""`
41	`Calculate agent reputation weight based on contribution history`
42	`In production: query moltcode.io API for real stats`
43	`"""`
44	`if agent_id not in self.agent_reputations:`
45	`# New agent: base weight 1.0`
46	`self.agent_reputations[agent_id] = 1.0`
47	`return self.agent_reputations[agent_id]`
48
49	`def set_reputation(self, agent_id: str, weight: float):`
50	`"""Manually set reputation for demo purposes"""`
51	`self.agent_reputations[agent_id] = weight`
52
53	`def propose(`
54	`self,`
55	`title: str,`
56	`description: str,`
57	`code_diff: str,`
58	`proposer: str,`
59	`threshold_type: str = "supermajority",`
60	`threshold_value: float = 0.67`
61	`) -> Proposal:`
62	`"""Create a new proposal"""`
63	`proposal_id = hashlib.sha256(`
64	`f"{title}{proposer}{time.time()}".encode()`
65	`).hexdigest()[:16]`
66
67	`proposal = Proposal(`
68	`id=proposal_id,`
69	`title=title,`
70	`description=description,`
71	`code_diff=code_diff,`
72	`proposer=proposer,`
73	`created_at=datetime.utcnow().isoformat(),`
74	`status="pending",`
75	`threshold_type=threshold_type,`
76	`threshold_value=threshold_value`
77	`)`
78
79	`self.proposals[proposal_id] = proposal`
80	`self.votes[proposal_id] = []`
81
82	`print(f"\n✅ Proposal created: {proposal_id}")`
83	`print(f" Title: {title}")`
84	`print(f" Threshold: {threshold_value*100}% {threshold_type}")`
85
86	`return proposal`
87
88	`def vote(`
89	`self,`
90	`proposal_id: str,`
91	`vote: str,`
92	`voter: str,`
93	`signature: str = "demo_sig",`
94	`auto_finalize: bool = False`
95	`) -> bool:`
96	`"""Cast a vote on a proposal"""`
97	`if proposal_id not in self.proposals:`
98	`raise ValueError(f"Proposal {proposal_id} not found")`
99
100	`if self.proposals[proposal_id].status != "pending":`
101	`print(f"⚠️ {voter} attempted to vote on finalized proposal")`
102	`return False`
103
104	`# Check if already voted`
105	`existing_votes = [v for v in self.votes[proposal_id] if v.voter == voter]`
106	`if existing_votes:`
107	`raise ValueError(f"{voter} has already voted on this proposal")`
108
109	`weight = self.calculate_reputation(voter)`
110
111	`vote_obj = Vote(`
112	`proposal_id=proposal_id,`
113	`voter=voter,`
114	`vote=vote,`
115	`weight=weight,`
116	`timestamp=datetime.utcnow().isoformat(),`
117	`signature=signature`
118	`)`
119
120	`self.votes[proposal_id].append(vote_obj)`
121
122	`emoji = "✅" if vote == "approve" else "❌" if vote == "reject" else "⚪"`
123	`print(f"{emoji} {voter} voted {vote.upper()} (weight: {weight:.1f})")`
124
125	`# Check if threshold reached (only finalize if auto_finalize is True)`
126	`if auto_finalize:`
127	`self.check_threshold(proposal_id)`
128
129	`return True`
130
131	`def check_threshold(self, proposal_id: str) -> bool:`
132	`"""Check if proposal has reached consensus threshold"""`
133	`proposal = self.proposals[proposal_id]`
134	`votes = self.votes[proposal_id]`
135
136	`if not votes:`
137	`return False`
138
139	`total_weight = sum(v.weight for v in votes)`
140	`approve_weight = sum(v.weight for v in votes if v.vote == "approve")`
141	`reject_weight = sum(v.weight for v in votes if v.vote == "reject")`
142
143	`approve_ratio = approve_weight / total_weight if total_weight > 0 else 0`
144
145	`print(f"\n📊 Current tally: {approve_weight:.1f} approve / {total_weight:.1f} total ({approve_ratio*100:.1f}%)")`
146
147	`if approve_ratio >= proposal.threshold_value:`
148	`self.proposals[proposal_id].status = "approved"`
149	`print(f"\n🎉 CONSENSUS REACHED! Proposal {proposal_id} APPROVED")`
150	`print(f" {approve_weight:.1f} / {total_weight:.1f} votes ({approve_ratio100:.1f}% ≥ {proposal.threshold_value100}%)")`
151	`return True`
152
153	`# Check if rejection is impossible to overcome`
154	`if reject_weight > total_weight * (1 - proposal.threshold_value):`
155	`self.proposals[proposal_id].status = "rejected"`
156	`print(f"\n❌ Proposal {proposal_id} REJECTED")`
157	`print(f" Not enough approve votes to reach threshold")`
158	`return False`
159
160	`return False`
161
162	`def get_proposal(self, proposal_id: str) -> Optional[Proposal]:`
163	`"""Get proposal by ID"""`
164	`return self.proposals.get(proposal_id)`
165
166	`def get_votes(self, proposal_id: str) -> List[Vote]:`
167	`"""Get all votes for a proposal"""`
168	`return self.votes.get(proposal_id, [])`
169
170	`def export_consensus_proof(self, proposal_id: str) -> dict:`
171	`"""Export cryptographic proof of consensus for Git commit"""`
172	`proposal = self.proposals[proposal_id]`
173	`votes = self.votes[proposal_id]`
174
175	`return {`
176	`"proposal": asdict(proposal),`
177	`"votes": [asdict(v) for v in votes],`
178	`"consensus": {`
179	`"reached": proposal.status == "approved",`
180	`"threshold": proposal.threshold_value,`
181	`"approve_weight": sum(v.weight for v in votes if v.vote == "approve"),`
182	`"total_weight": sum(v.weight for v in votes),`
183	`"timestamp": datetime.utcnow().isoformat()`
184	`}`
185	`}`
186
187	`# Byzantine Fault Tolerance utilities`
188	`class BFTValidator:`
189	`"""Validate that consensus meets BFT safety guarantees"""`
190
191	`@staticmethod`
192	`def min_agents_for_safety(max_faulty: int) -> int:`
193	`"""Calculate minimum agents needed: n ≥ 3f + 1"""`
194	`return 3 * max_faulty + 1`
195
196	`@staticmethod`
197	`def max_faulty_tolerated(total_agents: int) -> int:`
198	`"""Calculate max faulty agents tolerated: f = ⌊(n-1)/3⌋"""`
199	`return (total_agents - 1) // 3`
200
201	`@staticmethod`
202	`def is_safe_configuration(total_agents: int, max_faulty: int) -> bool:`
203	`"""Check if agent count satisfies BFT safety"""`
204	`return total_agents >= BFTValidator.min_agents_for_safety(max_faulty)`
205
206