types

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 Go to latest Published: Nov 11, 2023 License: Apache-2.0 Imports: 1 Imported by: 0

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Constants

This section is empty.

Variables

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var (
	// ErrorStatusNotFound means not found for various hostcalls.
	ErrorStatusNotFound = errors.New("error status returned by host: not found")
	// ErrorStatusBadArgument means the arguments for a hostcall are invalid.
	ErrorStatusBadArgument = errors.New("error status returned by host: bad argument")
	// ErrorStatusEmpty means the target queue of DequeueSharedQueue call is empty.
	ErrorStatusEmpty = errors.New("error status returned by host: empty")
	// ErrorStatusCasMismatch means the CAS value provided to the SetSharedData
	// does not match the current value. It indicates that other Wasm VMs
	// have already set a value for the same key, and the current CAS
	// for the key gets incremented.
	// Having retry logic in the face of this error is recommended.
	ErrorStatusCasMismatch = errors.New("error status returned by host: cas mismatch")
	// ErrorInternalFailure indicates an internal failure in hosts.
	// When this error occurs, there's nothing we could do in the Wasm VM.
	// Abort or panic after this error is recommended.
	ErrorInternalFailure = errors.New("error status returned by host: internal failure")
	// ErrorUnimplemented indicates the API is not implemented in the host yet.
	ErrorUnimplemented = errors.New("error status returned by host: unimplemented")
)

Functions

This section is empty.

Types

type Action 

type Action uint32

Action represents the action which Wasm contexts expects hosts to take. 

const (
	// ActionContinue means that the host continues the processing.
	ActionContinue Action = 0
	// ActionPause means that the host pauses the processing.
	ActionPause Action = 1
)

type DefaultHttpContext 

type DefaultHttpContext struct{}

DefaultHttpContext provides the no-op implementation of the HttpContext interface.

func (*DefaultHttpContext) OnHttpRequestBody 

func (*DefaultHttpContext) OnHttpRequestBody(int, bool) Action

func (*DefaultHttpContext) OnHttpRequestHeaders 

func (*DefaultHttpContext) OnHttpRequestHeaders(int, bool) Action

func (*DefaultHttpContext) OnHttpRequestTrailers 

func (*DefaultHttpContext) OnHttpRequestTrailers(int) Action

func (*DefaultHttpContext) OnHttpResponseBody 

func (*DefaultHttpContext) OnHttpResponseBody(int, bool) Action

func (*DefaultHttpContext) OnHttpResponseHeaders 

func (*DefaultHttpContext) OnHttpResponseHeaders(int, bool) Action

func (*DefaultHttpContext) OnHttpResponseTrailers 

func (*DefaultHttpContext) OnHttpResponseTrailers(int) Action

func (*DefaultHttpContext) OnHttpStreamDone 

func (*DefaultHttpContext) OnHttpStreamDone()

type DefaultPluginContext 

type DefaultPluginContext struct{}

DefaultPluginContext provides the no-op implementation of the PluginContext interface.

func (*DefaultPluginContext) NewHttpContext 

func (*DefaultPluginContext) NewHttpContext(uint32) HttpContext

func (*DefaultPluginContext) NewTcpContext 

func (*DefaultPluginContext) NewTcpContext(uint32) TcpContext

func (*DefaultPluginContext) OnPluginDone 

func (*DefaultPluginContext) OnPluginDone() bool

func (*DefaultPluginContext) OnPluginStart 

func (*DefaultPluginContext) OnPluginStart(int) OnPluginStartStatus

func (*DefaultPluginContext) OnQueueReady 

func (*DefaultPluginContext) OnQueueReady(uint32)

func (*DefaultPluginContext) OnTick 

func (*DefaultPluginContext) OnTick()

type DefaultTcpContext 

type DefaultTcpContext struct{}

DefaultTcpContext provides the no-op implementation of the TcpContext interface.

func (*DefaultTcpContext) OnDownstreamClose 

func (*DefaultTcpContext) OnDownstreamClose(PeerType)

func (*DefaultTcpContext) OnDownstreamData 

func (*DefaultTcpContext) OnDownstreamData(int, bool) Action

func (*DefaultTcpContext) OnNewConnection 

func (*DefaultTcpContext) OnNewConnection() Action

func (*DefaultTcpContext) OnStreamDone 

func (*DefaultTcpContext) OnStreamDone()

func (*DefaultTcpContext) OnUpstreamClose 

func (*DefaultTcpContext) OnUpstreamClose(PeerType)

func (*DefaultTcpContext) OnUpstreamData 

func (*DefaultTcpContext) OnUpstreamData(int, bool) Action

type DefaultVMContext 

type DefaultVMContext struct{}

DefaultVMContext provides the no-op implementation of the VMContext interface.

func (*DefaultVMContext) NewPluginContext 

func (*DefaultVMContext) NewPluginContext(contextID uint32) PluginContext

func (*DefaultVMContext) OnVMStart 

func (*DefaultVMContext) OnVMStart(vmConfigurationSize int) OnVMStartStatus

type HttpContext 

type HttpContext interface {
	// OnHttpRequestHeaders is called when request headers arrive.
	// Return types.ActionPause if you want to stop sending headers to the upstream.
	OnHttpRequestHeaders(numHeaders int, endOfStream bool) Action

	// OnHttpRequestBody is called when a request body *frame* arrives.
	// Note that this is potentially called multiple times until we see end_of_stream = true.
	// Return types.ActionPause if you want to buffer the body and stop sending body to the upstream.
	// Even after returning types.ActionPause, this will be called when an unseen frame arrives.
	OnHttpRequestBody(bodySize int, endOfStream bool) Action

	// OnHttpRequestTrailers is called when request trailers arrive.
	// Return types.ActionPause if you want to stop sending trailers to the upstream.
	OnHttpRequestTrailers(numTrailers int) Action

	// OnHttpResponseHeaders is called when response headers arrive.
	// Return types.ActionPause if you want to stop sending headers to downstream.
	OnHttpResponseHeaders(numHeaders int, endOfStream bool) Action

	// OnHttpResponseBody is called when a response body *frame* arrives.
	// Note that this is potentially called multiple times until we see end_of_stream = true.
	// Return types.ActionPause if you want to buffer the body and stop sending body to the downtream.
	// Even after returning types.ActionPause, this will be called when an unseen frame arrives.
	OnHttpResponseBody(bodySize int, endOfStream bool) Action

	// OnHttpResponseTrailers is called when response trailers arrive.
	// Return types.ActionPause if you want to stop sending trailers to the downstream.
	OnHttpResponseTrailers(numTrailers int) Action

	// OnHttpStreamDone is called before the host deletes this context.
	// You can retrieve the HTTP request/response information (such as headers, etc.) during this call.
	// This can be used to implement logging features.
	OnHttpStreamDone()
}

HttpContext corresponds to each Http stream and is created by PluginContext via NewHttpContext.

type OnPluginStartStatus 

type OnPluginStartStatus bool

OnPluginStartStatus is the type of status returned by OnPluginStart 

const (
	// OnPluginStartStatusOK indicates that PluginContext.OnPluginStart succeeded.
	OnPluginStartStatusOK OnPluginStartStatus = true
	// OnPluginStartStatusFailed indicates that PluginContext.OnPluginStart failed.
	// Further processing for this plugin context never happens.
	OnPluginStartStatusFailed OnPluginStartStatus = false
)

type OnVMStartStatus 

type OnVMStartStatus bool

OnVMStartStatus is the type of status returned by OnVMStart 

const (
	// OnVMStartStatusOK indicates that VMContext.OnVMStartStatus succeeded.
	OnVMStartStatusOK OnVMStartStatus = true
	// OnVMStartStatusFailed indicates that VMContext.OnVMStartStatus failed.
	// Further processing for this VM never happens, and hosts would
	// delete this VM.
	OnVMStartStatusFailed OnVMStartStatus = false
)

type PeerType 

type PeerType uint32

PeerType represents the type of a peer of a connection. 

const (
	// PeerTypeUnknown means the type of a peer is unknown
	PeerTypeUnknown PeerType = 0
	// PeerTypeLocal means the type of a peer is local (i.e. proxy)
	PeerTypeLocal PeerType = 1
	// PeerTypeRemote means the type of a peer is remote (i.e. remote client)
	PeerTypeRemote PeerType = 2
)

type PluginContext 

type PluginContext interface {
	// OnPluginStart is called for all plugin contexts (after OnVmStart if this is the VM context).
	// During this call, GetPluginConfiguration is available and can be used to
	// retrieve the configuration set at config.configuration in the host configuration.
	OnPluginStart(pluginConfigurationSize int) OnPluginStartStatus

	// OnPluginDone is called right before the plugin contexts are deleted by hosts.
	// Return false to indicate plugin is in a pending state and there's more work left.
	// In that case you must call PluginDone() function once the work is completed to indicate that
	// hosts can kill this context.
	OnPluginDone() bool

	// OnQueueReady is called when the queue is ready after calling the RegisterQueue hostcall.
	// Note that the queue might be dequeued by another VM running in another thread, so it's
	// possible queue will be empty during the OnQueueReady even if it is not dequeued by this VM.
	OnQueueReady(queueID uint32)

	// OnTick is called when SetTickPeriodMilliSeconds hostcall is called by this plugin context.
	// This can be used to do asynchronous tasks in parallel to the stream processing.
	OnTick()

	// NewTcpContext is used for creating TcpContext for each Tcp stream.
	// Return nil to indicate this PluginContext is not for TcpContext.
	NewTcpContext(contextID uint32) TcpContext

	// NewHttpContext is used for creating HttpContext for each Http stream.
	// Return nil to indicate this PluginContext is not for HttpContext.
	NewHttpContext(contextID uint32) HttpContext
}

PluginContext corresponds to different plugin configurations (config.configuration). Each configuration is typically given at the HTTP/TCP filter in a listener in the hosts. PluginContext is responsible for creating the "filter instances" for each TCP/HTTP stream on the listener.

type TcpContext 

type TcpContext interface {
	// OnNewConnection is called when the Tcp connection is established between downstream and upstream.
	OnNewConnection() Action

	// OnDownstreamData is called when a data frame arrives from the downstream connection.
	OnDownstreamData(dataSize int, endOfStream bool) Action

	// OnDownstreamClose is called when the downstream connection is closed.
	OnDownstreamClose(peerType PeerType)

	// OnUpstreamData is called when a data frame arrives from the upstream connection.
	OnUpstreamData(dataSize int, endOfStream bool) Action

	// OnUpstreamClose is called when the upstream connection is closed.
	OnUpstreamClose(peerType PeerType)

	// OnStreamDone is called before the host deletes this context.
	// You can retrieve the stream information (such as remote addresses, etc.) during this call.
	// This can be used to implement logging features.
	OnStreamDone()
}

TcpContext corresponds to each Tcp stream and is created by PluginContext via NewTcpContext.

type VMContext 

type VMContext interface {
	// OnVMStart is called after the VM is created and main function is called.
	// During this call, GetVMConfiguration hostcall is available and can be used to
	// retrieve the configuration set at vm_config.configuration in the host configuration.
	// This is mainly used for doing Wasm VM-wide initialization.
	OnVMStart(vmConfigurationSize int) OnVMStartStatus

	// NewPluginContext is used for creating PluginContext for each plugin configuration.
	NewPluginContext(contextID uint32) PluginContext
}

VMContext corresponds to a Wasm VM machine and its configuration. It's the entrypoint for extending the network proxy. Its lifetime matches the Wasm Virtual Machines on the host.

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