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dotpython/src/DotPython.Hosting/DotPythonHost.cs at main · kidoz/dotpython · GitHub
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DotPython.Hosting
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DotPythonHost.cs
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DotPython.Hosting
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DotPythonHost.cs
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using
System
.
Diagnostics
.
CodeAnalysis
;
using
DotPython
.
Contracts
;
using
DotPython
.
Runtime
.
Managed
;
namespace
DotPython
.
Hosting
;
/// <summary>
/// Owns a managed DotPython runtime and typed module clients for small applications.
/// </summary>
public
sealed
class
DotPythonHost
:
IAsyncDisposable
{
private
readonly
object
_gate
=
new
(
)
;
private
readonly
DotPythonModuleProvider
_provider
;
private
readonly
IDotPythonModuleRuntime
_runtime
;
private
readonly
List
<
DotPythonModuleSession
>
_sessions
=
[
]
;
private
Task
?
_disposeTask
;
private
bool
_disposed
;
internal
DotPythonHost
(
IDotPythonModuleRuntime
runtime
)
{
_runtime
=
runtime
;
_provider
=
new
DotPythonModuleProvider
(
runtime
)
;
}
/// <summary>Creates a host that owns a managed DotPython runtime.</summary>
[
SuppressMessage
(
"Reliability"
,
"CA2000:Dispose objects before losing scope"
,
Justification
=
"The returned host takes ownership of the managed runtime."
)
]
public
static
DotPythonHost
CreateManaged
(
)
=>
new
(
new
ManagedPythonModuleRuntime
(
)
)
;
/// <summary>
/// Creates a host that takes ownership of a backend-independent module runtime.
/// </summary>
public
static
DotPythonHost
Create
(
IDotPythonModuleRuntime
runtime
)
{
ArgumentNullException
.
ThrowIfNull
(
runtime
)
;
return
new
DotPythonHost
(
runtime
)
;
}
/// <summary>Creates a typed client for a per-runtime module.</summary>
public
TService
GetModule
<
TService
>
(
PythonModuleRegistration
<
TService
>
registration
)
where
TService
:
class
=>
GetModule
(
registration
,
static
_
=>
{
}
)
;
/// <summary>Creates a configured typed client for a per-runtime module.</summary>
public
TService
GetModule
<
TService
>
(
PythonModuleRegistration
<
TService
>
registration
,
Action
<
DotPythonModuleHostingOptions
>
configure
)
where
TService
:
class
{
ArgumentNullException
.
ThrowIfNull
(
registration
)
;
ArgumentNullException
.
ThrowIfNull
(
configure
)
;
if
(
registration
.
StatePolicy
!=
PythonModuleStatePolicy
.
PerRuntime
)
{
throw
new
InvalidOperationException
(
"Per-session modules must be resolved from a DotPythonModuleSession."
)
;
}
lock
(
_gate
)
{
ObjectDisposedException
.
ThrowIf
(
_disposed
,
this
)
;
ConfigureProvider
(
_provider
,
registration
.
Definition
,
configure
)
;
return
registration
.
CreateClient
(
_provider
)
;
}
}
/// <summary>Loads and validates a per-runtime module before its first invocation.</summary>
public
ValueTask
WarmUpAsync
<
TService
>
(
PythonModuleRegistration
<
TService
>
registration
,
CancellationToken
cancellationToken
=
default
)
where
TService
:
class
=>
WarmUpAsync
(
registration
,
static
_
=>
{
}
,
cancellationToken
)
;
/// <summary>Loads and validates a configured per-runtime module.</summary>
public
ValueTask
WarmUpAsync
<
TService
>
(
PythonModuleRegistration
<
TService
>
registration
,
Action
<
DotPythonModuleHostingOptions
>
configure
,
CancellationToken
cancellationToken
=
default
)
where
TService
:
class
{
ArgumentNullException
.
ThrowIfNull
(
registration
)
;
ArgumentNullException
.
ThrowIfNull
(
configure
)
;
if
(
registration
.
StatePolicy
!=
PythonModuleStatePolicy
.
PerRuntime
)
{
throw
new
InvalidOperationException
(
"Per-session modules must be warmed within a DotPythonModuleSession."
)
;
}
lock
(
_gate
)
{
ObjectDisposedException
.
ThrowIf
(
_disposed
,
this
)
;
ConfigureProvider
(
_provider
,
registration
.
Definition
,
configure
)
;
return
_provider
.
WarmUpAsync
(
registration
.
Definition
,
cancellationToken
)
;
}
}
/// <summary>
/// Creates a logical state scope for per-session modules. This is not a security boundary.
/// </summary>
public
DotPythonModuleSession
CreateSession
(
)
{
lock
(
_gate
)
{
ObjectDisposedException
.
ThrowIf
(
_disposed
,
this
)
;
var
session
=
new
DotPythonModuleSession
(
_runtime
,
RemoveSession
)
;
_sessions
.
Add
(
session
)
;
return
session
;
}
}
/// <inheritdoc />
public
ValueTask
DisposeAsync
(
)
{
lock
(
_gate
)
{
if
(
_disposeTask
is
not
null
)
{
return
new
ValueTask
(
_disposeTask
)
;
}
_disposed
=
true
;
_disposeTask
=
DisposeCoreAsync
(
_sessions
.
AsEnumerable
(
)
.
Reverse
(
)
.
ToArray
(
)
)
;
return
new
ValueTask
(
_disposeTask
)
;
}
}
private
async
Task
DisposeCoreAsync
(
IReadOnlyList
<
DotPythonModuleSession
>
sessions
)
{
try
{
foreach
(
var
session
in
sessions
)
{
await
session
.
DisposeFromHostAsync
(
)
.
ConfigureAwait
(
false
)
;
}
}
finally
{
try
{
await
_provider
.
DisposeAsync
(
)
.
ConfigureAwait
(
false
)
;
}
finally
{
await
_runtime
.
DisposeAsync
(
)
.
ConfigureAwait
(
false
)
;
}
}
}
private
void
RemoveSession
(
DotPythonModuleSession
session
)
{
lock
(
_gate
)
{
_sessions
.
Remove
(
session
)
;
}
}
internal
static
void
ConfigureProvider
(
DotPythonModuleProvider
provider
,
PythonModuleDefinition
definition
,
Action
<
DotPythonModuleHostingOptions
>
configure
)
{
var
options
=
new
DotPythonModuleHostingOptions
(
)
;
configure
(
options
)
;
options
.
Validate
(
)
;
provider
.
ConfigureInitialization
(
definition
,
options
.
MaximumInitializationAttempts
)
;
}
}
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