error.jl
# This file is a part of Julia. License is MIT: https://julialang.org/license
# for curmod_str
include("testenv.jl")
@testset "ExponentialBackOff" begin
@test length(ExponentialBackOff(n=10)) == 10
@test collect(ExponentialBackOff(n=10, first_delay=0.01))[1] == 0.01
@test maximum(ExponentialBackOff(n=10, max_delay=0.06)) == 0.06
ratio(x) = x[2:end]./x[1:end-1]
@test all(x->x ≈ 10.0, ratio(collect(ExponentialBackOff(n=10, max_delay=Inf, factor=10, jitter=0.0))))
Libc.srand(12345)
x = ratio(collect(ExponentialBackOff(n=100, max_delay=Inf, factor=1, jitter=0.1)))
xm = sum(x) / length(x)
@test abs(xm - 1.0) < 0.01
Libc.srand()
end
@testset "retrying after errors" begin
function foo_error(c, n)
c[1] += 1
if c[1] <= n
error("foo")
end
return 7
end
# Success on first attempt
c = [0]
@test retry(foo_error)(c,0) == 7
@test c[1] == 1
# Success on second attempt
c = [0]
@test retry(foo_error)(c,1) == 7
@test c[1] == 2
# 2 failed retry attempts, so exception is raised
c = [0]
ex = try retry(foo_error, delays=ExponentialBackOff(n=2))(c,3) catch e; e end
@test ex.msg == "foo"
@test c[1] == 3
c = [0]
ex = try retry(foo_error, check=(s,e)->(s,isa(e, ErrorException)))(c,2) catch e; e end
@test typeof(ex) == ErrorException
@test ex.msg == "foo"
@test c[1] == 2
c = [0]
ex = try retry(foo_error, check=(s,e)->(s,e.msg == "foo"))(c,2) catch e; e end
@test typeof(ex) == ErrorException
@test ex.msg == "foo"
@test c[1] == 2
# No retry if condition does not match
c = [0]
ex = try retry(foo_error, check=(s,e)->(s,e.msg == "bar"))(c,2) catch e; e end
@test typeof(ex) == ErrorException
@test ex.msg == "foo"
@test c[1] == 1
c = [0]
ex = try retry(foo_error, check=(s,e)->(s,try e.http_status_code == "503"; catch; end != true))(c,2) catch e; e end
@test typeof(ex) == ErrorException
@test ex.msg == "foo"
@test c[1] == 2
c = [0]
ex = try retry(foo_error, check=(s,e)->(s,isa(e,SystemError)))(c,2) catch e; e end
@test typeof(ex) == ErrorException
@test ex.msg == "foo"
@test c[1] == 1
# Test example in docstring where the check function doesn't return the state.
c = [0]
@test retry(foo_error, check=(s,e)->e.msg == "foo")(c,1) == 7
@test c[1] == 2
# Functions with keyword arguments
foo_kwargs(x; y=5) = x + y
@test retry(foo_kwargs)(3) == 8
@test retry(foo_kwargs)(3; y=4) == 7
# non-Functions
@test retry(Float64)(1) === 1.0
end
@testset "SystemError initialization" begin
e = SystemError("fail")
@test e.extrainfo === nothing
end
@testset "MethodError for methods without line numbers" begin
try
eval(Expr(:function, :(f44319()), 0))
f44319(1)
catch e
s = sprint(showerror, e)
@test s == """MethodError: no method matching f44319(::Int$(Sys.WORD_SIZE))
The function `f44319` exists, but no method is defined for this combination of argument types.
Closest candidates are:\n f44319()\n @ $curmod_str none:0
"""
end
end
@testset "All types ending with Exception or Error subtype Exception" begin
function test_exceptions(mod, visited=Set{Module}())
if mod ∉ visited
push!(visited, mod)
for name in names(mod, all=true)
isdefined(mod, name) || continue
value = getfield(mod, name)
if value isa Module
test_exceptions(value, visited)
elseif value isa Type
str = string(value)
if endswith(str, "Exception") || endswith(str, "Error")
@test value <: Exception
end
end
end
end
visited
end
visited = test_exceptions(Base)
test_exceptions(Core, visited)
end