executor

Documentation

Index

• func CreateScalarSource(ID parser.NodeID, params ScalarParams, options transform.Options) (parser.Source, *transform.Controller)
• func CreateSource(ID parser.NodeID, params SourceParams, storage storage.Storage, ...) (parser.Source, *transform.Controller)
• func CreateTransform(ID parser.NodeID, params transform.Params, options transform.Options) (transform.OpNode, *transform.Controller)
• type Engine
  • func NewEngine(store storage.Storage, scope tally.Scope, lookbackDuration time.Duration) *Engine
  • func (e *Engine) Close() error
  • func (e *Engine) Execute(ctx context.Context, query *storage.FetchQuery, opts *EngineOptions, ...)
  • func (e *Engine) ExecuteExpr(ctx context.Context, parser parser.Parser, opts *EngineOptions, ...)
• type EngineOptions
• type ExecutionState
  • func GenerateExecutionState(pplan plan.PhysicalPlan, storage storage.Storage) (*ExecutionState, error)
  • func (s *ExecutionState) Execute(ctx context.Context) error
  • func (s *ExecutionState) String() string
• type Query
• type Request
• type Result
• type ResultChan
• type ResultNode
  • func (r *ResultNode) Process(ID parser.NodeID, block block.Block) error
  • func (r *ResultNode) ResultChan() chan ResultChan
• type ScalarParams
• type SourceParams
• type State
  • func (s State) String() string

Functions

func CreateScalarSource

func CreateScalarSource(
	ID parser.NodeID,
	params ScalarParams,
	options transform.Options,
) (parser.Source, *transform.Controller)

CreateScalarSource creates a scalar source node

func CreateSource

func CreateSource(
	ID parser.NodeID,
	params SourceParams, storage storage.Storage,
	options transform.Options,
) (parser.Source, *transform.Controller)

CreateSource creates a source node

func CreateTransform

func CreateTransform(
	ID parser.NodeID,
	params transform.Params,
	options transform.Options,
) (transform.OpNode, *transform.Controller)

CreateTransform creates a transform node which works on functions and contains state

Types

type Engine

type Engine struct {
	// contains filtered or unexported fields
}

Engine executes a Query.

func NewEngine

func NewEngine(store storage.Storage, scope tally.Scope, lookbackDuration time.Duration) *Engine

NewEngine returns a new instance of QueryExecutor.

func (*Engine) Close

func (e *Engine) Close() error

Close kills all running queries and prevents new queries from being attached.

func (*Engine) Execute

func (e *Engine) Execute(
	ctx context.Context,
	query *storage.FetchQuery,
	opts *EngineOptions,
	results chan *storage.QueryResult,
)

Execute runs the query and closes the results channel once done

func (*Engine) ExecuteExpr

func (e *Engine) ExecuteExpr(
	ctx context.Context,
	parser parser.Parser,
	opts *EngineOptions,
	params models.RequestParams,
	results chan Query,
)

ExecuteExpr runs the query DAG and closes the results channel once done nolint: unparam

type EngineOptions

type EngineOptions struct {
}

EngineOptions can be used to pass custom flags to engine

type ExecutionState

type ExecutionState struct {
	// contains filtered or unexported fields
}

ExecutionState represents the execution hierarchy

func GenerateExecutionState

func GenerateExecutionState(
	pplan plan.PhysicalPlan,
	storage storage.Storage,
) (*ExecutionState, error)

GenerateExecutionState creates an execution state from the physical plan

func (*ExecutionState) Execute

func (s *ExecutionState) Execute(ctx context.Context) error

Execute the sources in parallel and return the first error

func (*ExecutionState) String

func (s *ExecutionState) String() string

String representation of the state

type Query

type Query struct {
	Err    error
	Result Result
}

Query is the result after execution

type Request

type Request struct {
	// contains filtered or unexported fields
}

Request represents a single request.

type Result

type Result interface {
	ResultChan() chan ResultChan
	// contains filtered or unexported methods
}

Result provides the execution results

type ResultChan

type ResultChan struct {
	Block block.Block
	Err   error
}

ResultChan has the result from a block

type ResultNode

type ResultNode struct {
	// contains filtered or unexported fields
}

ResultNode is used to provide the results to the caller from the query execution

func (*ResultNode) Process

func (r *ResultNode) Process(ID parser.NodeID, block block.Block) error

Process the block

func (*ResultNode) ResultChan

func (r *ResultNode) ResultChan() chan ResultChan

ResultChan return a channel to stream back resultChan to the client

type ScalarParams

type ScalarParams interface {
	parser.Params
	Node(
		controller *transform.Controller,
		options transform.Options,
	) parser.Source
}

ScalarParams are defined by sources

type SourceParams

type SourceParams interface {
	parser.Params
	Node(
		controller *transform.Controller,
		storage storage.Storage,
		options transform.Options,
	) parser.Source
}

SourceParams are defined by sources

type State

type State int

State is the request state.

func (State) String

func (s State) String() string