`no method matching length(::Nothing)` in `get_engine` when engine does not exist

[msagarpatel]

The following error occurs in get_engine():

julia> get_engine(ctx, "sagar-2022-11-12")
ERROR: MethodError: no method matching length(::Nothing)
Closest candidates are:
  length(::Union{Base.KeySet, Base.ValueIterator}) at abstractdict.jl:58
  length(::Union{LinearAlgebra.Adjoint{T, S}, LinearAlgebra.Transpose{T, S}} where {T, S}) at /Applications/Julia-1.8.app/Contents/Resources/julia/share/julia/stdlib/v1.8/LinearAlgebra/src/adjtrans.jl:172
  length(::Union{Tables.AbstractColumns, Tables.AbstractRow}) at ~/.julia/packages/Tables/T7rHm/src/Tables.jl:180
  ...
Stacktrace:
 [1] get_engine(ctx::Context, engine::String; kw::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ RAI ~/.julia/packages/RAI/RbjsZ/src/api.jl:262
 [2] get_engine(ctx::Context, engine::String)
   @ RAI ~/.julia/packages/RAI/RbjsZ/src/api.jl:259
 [3] top-level scope
   @ REPL[3]:1

This occurs when the engine does not exist, when it is in the PROVISIONING state, or when it has been deleted. The error does not occur in the PROVISIONED state. It's unclear whether the error occurs in the DELETE_REQUESTED state.

Based BWA logs, I believe this error started occurring some time between Wed, 09 Nov 2022 08:04:44 GMT and Fri, 11 Nov 2022 03:48:32 GMT.

@vilterp also observed this error.

[geokollias]

It should be fixed by https://github.com/RelationalAI/raicloud-control-plane/pull/4169. Feel free to close once confirmed.

[msagarpatel]

Thank you, @geokollias! I think that did the trick.

Does not exist

julia> r = get_engine(ctx, "does-not-exsti")
ERROR: 404 Not Found

Stacktrace:
 [1] get_engine(ctx::Context, engine::String; kw::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ RAI ~/.julia/packages/RAI/RbjsZ/src/api.jl:262
 [2] get_engine(ctx::Context, engine::String)
   @ RAI ~/.julia/packages/RAI/RbjsZ/src/api.jl:259
 [3] top-level scope
   @ REPL[19]:1

Was deleted

julia> r = create_engine(ctx, "will-exist-soon", size="S")
JSON3.Object{Vector{UInt8}, Vector{UInt64}} with 1 entry:
  :compute => {…

julia> r = get_engine(ctx, "will-exist-soon")
JSON3.Object{Vector{UInt8}, SubArray{UInt64, 1, Vector{UInt64}, Tuple{UnitRange{Int64}}, true}} with 9 entries:
...
  :state        => "PROVISIONED"
...


julia> r = delete_engine(ctx, "will-exist-soon")
JSON3.Object{Vector{UInt8}, Vector{UInt64}} with 1 entry:
  :status => {…

julia> println(r)
{
   "status": {
                   "name": "will-exist-soon",
                  "state": "DELETING",
                "message": "engine \"will-exist-soon\" deleted successfully"
             }
}

julia> r = get_engine(ctx, "will-exist-soon")
ERROR: 404 Not Found

Stacktrace:
 [1] get_engine(ctx::Context, engine::String; kw::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ RAI ~/.julia/packages/RAI/RbjsZ/src/api.jl:262
 [2] get_engine(ctx::Context, engine::String)
   @ RAI ~/.julia/packages/RAI/RbjsZ/src/api.jl:259
 [3] top-level scope
   @ REPL[24]:1

[billscheidel-rai]

Note: This issue has been migrated to https://relationalai.atlassian.net/browse/RAI-7922.

This link is only accessible to employees of RelationalAI.