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tarantool-etcd-828 iproto-impl: etcd_member_promote vs Cluster.MemberPromote Lined Up

status: open P3 task milestone:m4-iproto-parity
bd update tarantool-etcd-828 --claim bd close tarantool-etcd-828
Created byEugene Blikh
Ownerbigbes@gmail.com
Created2026-05-19T14:54:28Z
Updated2026-07-17T14:27:36Z
Description
Wrap the existing handler cluster.member_promote (already invoked by gRPC/JSON via defs.lua route etcdserverpb.Cluster.MemberPromote) as a Lua global etcd_member_promote callable via iproto CALL. Mechanical change in app/etcd/api.lua: add rawset(_G, 'etcd_member_promote', wrap('cluster', 'member_promote')) under the appropriate service block; append 'etcd_member_promote' to the funcs table so box.schema.func.create plus guest grant runs at role apply; document the wrapper in the module-level LDoc comment. If Cluster.MemberPromote returns UNIMPLEMENTED today, the wrapper still gets added so the iproto caller observes the same UNIMPLEMENTED error gRPC would return. Election.Observe is server-streaming over gRPC; iproto has no stream primitive, so propose a polling shape (observe_create/_pull/_cancel) mirroring the Watch precedent at api.lua:81-83.
Acceptance criteria
etcd_member_promote is callable from net.box:call('etcd_member_promote', {req}) with no Lua error before handler dispatch. Successful request shape produces same successful response shape as gRPC. box.schema.func.create plus guest grant idempotent on role re-apply.
Notes
Epic tarantool-etcd-w8q. Handler at app/etcd/cluster.lua.

Depends on

No outgoing dependencies.

Depended on by

  • tarantool-etcd-70j — iproto-verify: etcd_member_promote vs Cluster.MemberPromote blocks

No comments.

  • Eugene Blikh created the issue · 2026-05-19T17:54:27Z
  • Eugene Blikh tarantool-etcd-70j now depends on this · 2026-05-19T17:54:28Z
  • Eugene Blikh added label milestone:m4-iproto-parity · 2026-05-21T14:37:18Z
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issues 1 row
id tarantool-etcd-828
content_hash 07dec43fc47708505ca97b18aaf13e621ccca512a7a74fe5c56e9fc9f0feea68
title iproto-impl: etcd_member_promote vs Cluster.MemberPromote
description Wrap the existing handler cluster.member_promote (already invoked by gRPC/JSON via defs.lua route etcdserverpb.Cluster.MemberPromote) as a Lua global etcd_member_promote callable via iproto CALL. Mechanical change in app/etcd/api.lua: add rawset(_G, 'etcd_member_promote', wrap('cluster', 'member_promote')) under the appropriate service block; append 'etcd_member_promote' to the funcs table so box.schema.func.create plus guest grant runs at role apply; document the wrapper in the module-level LDoc comment. If Cluster.MemberPromote returns UNIMPLEMENTED today, the wrapper still gets added so the iproto caller observes the same UNIMPLEMENTED error gRPC would return. Election.Observe is server-streaming over gRPC; iproto has no stream primitive, so propose a polling shape (observe_create/_pull/_cancel) mirroring the Watch precedent at api.lua:81-83.
design
acceptance_criteria etcd_member_promote is callable from net.box:call('etcd_member_promote', {req}) with no Lua error before handler dispatch. Successful request shape produces same successful response shape as gRPC. box.schema.func.create plus guest grant idempotent on role re-apply.
notes Epic tarantool-etcd-w8q. Handler at app/etcd/cluster.lua.
status open
priority 3
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created_at 2026-05-19T14:54:28Z
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comment Added label: milestone:m4-iproto-parity
created_at 2026-05-21T14:37:18Z