fix(sdk): deterministic session IDs across server instances#8
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johannmachemer merged 2 commits intomainfrom Feb 27, 2026
Merged
fix(sdk): deterministic session IDs across server instances#8johannmachemer merged 2 commits intomainfrom
johannmachemer merged 2 commits intomainfrom
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Replace the in-memory globalSessionMap with deterministic session ID derivation using SHA-256 hashing of the MCP session key. This ensures that different server instances processing the same MCP session produce the same Yavio session ID without requiring shared state. - Add deriveSessionId() to ids.ts (SHA-256 → base64url, truncated to 21 chars) - Remove globalSessionMap, MAX_SESSION_MAP_SIZE, and LRU eviction logic - Simplify getSession() → resolveSession() (direct derivation, no map lookup) - Rename _resetSessionMap → _resetGlobalState (only clears dedup sets) - Replace eviction test with cross-instance stability test
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Summary
globalSessionMapwith deterministic session ID derivation using SHA-256 hashing of the MCP session key — any server instance processing the same MCP session now produces the same Yavio session ID without shared statederiveSessionId()toids.ts(SHA-256 → base64url, truncated to 21 chars, matchingses_prefix format)globalSessionMap,MAX_SESSION_MAP_SIZE, and LRU eviction logic that only worked within a single processgetSession()→resolveSession()— direct derivation instead of map lookupTest plan
deriveSessionIdunit tests (prefix, length, determinism, uniqueness, URL-safe chars)