influxql

package
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 Go to latest Published: Nov 30, 2015 License: MIT, MIT Imports: 14 Imported by: 0

Documentation ¶

Overview ¶

Package influxql implements a parser for the InfluxDB query language.

InfluxQL is a DML and DDL language for the InfluxDB time series database. It provides the ability to query for aggregate statistics as well as create and configure the InfluxDB server.

Selecting data ¶

The SELECT query is used for retrieving data from one or more series. It allows for a list of columns followed by a list of series to select from. 

SELECT value FROM cpu_load

You can also add a a conditional expression to limit the results of the query: 

SELECT value FROM cpu_load WHERE host = 'influxdb.com'

Two or more series can be combined into a single query and executed together: 

SELECT cpu0.value + cpu1.value
FROM cpu_load AS cpu0 INNER JOIN cpu_load cpu1 ON cpu0.host = cpu1.host

Limits and ordering can be set on selection queries as well: 

SELECT value FROM cpu_load LIMIT 100 ORDER DESC;

Removing data ¶

The DELETE query is available to remove time series data points from the database. This query will delete "cpu_load" values older than an hour: 

DELETE FROM cpu_load WHERE time < now() - 1h

Continuous Queries ¶

Queries can be run indefinitely on the server in order to generate new series. This is done by running a "SELECT INTO" query. For example, this query computes the hourly mean for cpu_load and stores it into a "cpu_load" series in the "daily" shard space. 

SELECT mean(value) AS value FROM cpu_load GROUP BY 1h
INTO daily.cpu_load

If there is existing data on the source series then this query will be run for all historic data. To only execute the query on new incoming data you can append "NO BACKFILL" to the end of the query: 

SELECT mean(value) AS value FROM cpu_load GROUP BY 1h
INTO daily.cpu_load NO BACKFILL

Continuous queries will return an id that can be used to remove them in the future. To remove a continous query, use the DROP CONTINUOUS QUERY statement: 

DROP CONTINUOUS QUERY 12

You can also list all continuous queries by running: 

LIST CONTINUOUS QUERIES

Index ¶

Constants ¶

View Source 
const (
	// Unknown primitive data type.
	Unknown DataType = 0
	// Float means the data type is a float
	Float = 1
	// Integer means the data type is a integer
	Integer = 2
	// Boolean means the data type is a boolean.
	Boolean = 3
	// String means the data type is a string of text.
	String = 4
	// Time means the data type is a time.
	Time = 5
	// Duration means the data type is a duration of time.
	Duration = 6
)
View Source 
const (
	// DateFormat represents the format for date literals.
	DateFormat = "2006-01-02"

	// DateTimeFormat represents the format for date time literals.
	DateTimeFormat = "2006-01-02 15:04:05.999999"
)

Variables ¶

View Source 
var ErrInvalidDuration = errors.New("invalid duration")

ErrInvalidDuration is returned when parsing a malformatted duration.

Functions ¶

func Eval ¶ 

func Eval(expr Expr, m map[string]interface{}) interface{}

Eval evaluates expr against a map.

func EvalBool ¶ added in v0.2.0 

func EvalBool(expr Expr, m map[string]interface{}) bool

EvalBool evaluates expr and returns true if result is a boolean true. Otherwise returns false.

func FormatDuration ¶ 

func FormatDuration(d time.Duration) string

FormatDuration formats a duration to a string.

func HasTimeExpr ¶ added in v0.2.0 

func HasTimeExpr(expr Expr) bool

HasTimeExpr returns true if the expression has a time term.

func IdentNeedsQuotes ¶ 

func IdentNeedsQuotes(ident string) bool

IdentNeedsQuotes returns true if the ident string given would require quotes.

func IsRegexOp ¶ 

func IsRegexOp(t Token) bool

IsRegexOp returns true if the operator accepts a regex operand.

func MatchSource ¶ 

func MatchSource(sources Sources, name string) string

MatchSource returns the source name that matches a field name. Returns a blank string if no sources match.

func OnlyTimeExpr ¶ added in v0.2.0 

func OnlyTimeExpr(expr Expr) bool

OnlyTimeExpr returns true if the expression only has time constraints.

func ParseDuration ¶ 

func ParseDuration(s string) (time.Duration, error)

ParseDuration parses a time duration from a string.

func QuoteIdent ¶ 

func QuoteIdent(segments ...string) string

QuoteIdent returns a quoted identifier from multiple bare identifiers.

func QuoteString ¶ 

func QuoteString(s string) string

QuoteString returns a quoted string.

func ScanBareIdent ¶ 

func ScanBareIdent(r io.RuneScanner) string

ScanBareIdent reads bare identifier from a rune reader.

func ScanDelimited ¶ 

func ScanDelimited(r io.RuneScanner, start, end rune, escapes map[rune]rune, escapesPassThru bool) ([]byte, error)

func ScanString ¶ 

func ScanString(r io.RuneScanner) (string, error)

ScanString reads a quoted string from a rune reader.

func TimeRange ¶ 

func TimeRange(expr Expr) (min, max time.Time)

TimeRange returns the minimum and maximum times specified by an expression. Returns zero times if there is no bound.

func TimeRangeAsEpochNano ¶ 

func TimeRangeAsEpochNano(expr Expr) (min, max int64)

TimeRange returns the minimum and maximum times, as epoch nano, specified by and expression. If there is no lower bound, the start of the epoch is returned for minimum. If there is no higher bound, now is returned for maximum.

func Walk ¶ 

func Walk(v Visitor, node Node)

Walk traverses a node hierarchy in depth-first order.

func WalkFunc ¶ 

func WalkFunc(node Node, fn func(Node))

WalkFunc traverses a node hierarchy in depth-first order.

Types ¶

type AlterRetentionPolicyStatement ¶ 

type AlterRetentionPolicyStatement struct {
	// Name of policy to alter.
	Name string

	// Name of the database this policy belongs to.
	Database string

	// Duration data written to this policy will be retained.
	Duration *time.Duration

	// Replication factor for data written to this policy.
	Replication *int

	// Should this policy be set as defalut for the database?
	Default bool
}

AlterRetentionPolicyStatement represents a command to alter an existing retention policy.

func (*AlterRetentionPolicyStatement) RequiredPrivileges ¶ 

func (s *AlterRetentionPolicyStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute an AlterRetentionPolicyStatement.

func (*AlterRetentionPolicyStatement) String ¶ 

func (s *AlterRetentionPolicyStatement) String() string

String returns a string representation of the alter retention policy statement.

type BinaryExpr ¶ 

type BinaryExpr struct {
	Op  Token
	LHS Expr
	RHS Expr
}

BinaryExpr represents an operation between two expressions.

func (*BinaryExpr) String ¶ 

func (e *BinaryExpr) String() string

String returns a string representation of the binary expression.

type BooleanLiteral ¶ 

type BooleanLiteral struct {
	Val bool
}

BooleanLiteral represents a boolean literal.

func (*BooleanLiteral) String ¶ 

func (l *BooleanLiteral) String() string

String returns a string representation of the literal.

type Call ¶ 

type Call struct {
	Name string
	Args []Expr
}

Call represents a function call.

func (*Call) Fields ¶ added in v0.2.0 

func (c *Call) Fields() []string

Fields will extract any field names from the call. Only specific calls support this.

func (*Call) String ¶ 

func (c *Call) String() string

String returns a string representation of the call.

type CreateContinuousQueryStatement ¶ 

type CreateContinuousQueryStatement struct {
	// Name of the continuous query to be created.
	Name string

	// Name of the database to create the continuous query on.
	Database string

	// Source of data (SELECT statement).
	Source *SelectStatement
}

CreateContinuousQueryStatement represents a command for creating a continuous query.

func (*CreateContinuousQueryStatement) DefaultDatabase ¶ 

func (s *CreateContinuousQueryStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*CreateContinuousQueryStatement) RequiredPrivileges ¶ 

func (s *CreateContinuousQueryStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateContinuousQueryStatement.

func (*CreateContinuousQueryStatement) String ¶ 

func (s *CreateContinuousQueryStatement) String() string

String returns a string representation of the statement.

type CreateDatabaseStatement ¶ 

type CreateDatabaseStatement struct {
	// Name of the database to be created.
	Name string

	// IfNotExists indicates whether to return without error if the database
	// already exists.
	IfNotExists bool
}

CreateDatabaseStatement represents a command for creating a new database.

func (*CreateDatabaseStatement) RequiredPrivileges ¶ 

func (s *CreateDatabaseStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateDatabaseStatement.

func (*CreateDatabaseStatement) String ¶ 

func (s *CreateDatabaseStatement) String() string

String returns a string representation of the create database statement.

type CreateRetentionPolicyStatement ¶ 

type CreateRetentionPolicyStatement struct {
	// Name of policy to create.
	Name string

	// Name of database this policy belongs to.
	Database string

	// Duration data written to this policy will be retained.
	Duration time.Duration

	// Replication factor for data written to this policy.
	Replication int

	// Should this policy be set as default for the database?
	Default bool
}

CreateRetentionPolicyStatement represents a command to create a retention policy.

func (*CreateRetentionPolicyStatement) RequiredPrivileges ¶ 

func (s *CreateRetentionPolicyStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateRetentionPolicyStatement.

func (*CreateRetentionPolicyStatement) String ¶ 

func (s *CreateRetentionPolicyStatement) String() string

String returns a string representation of the create retention policy.

type CreateSubscriptionStatement ¶ added in v0.2.0 

type CreateSubscriptionStatement struct {
	Name            string
	Database        string
	RetentionPolicy string
	Destinations    []string
	Mode            string
}

CreateSubscriptionStatement represents a command to add a subscription to the incoming data stream

func (*CreateSubscriptionStatement) RequiredPrivileges ¶ added in v0.2.0 

func (s *CreateSubscriptionStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateSubscriptionStatement

func (*CreateSubscriptionStatement) String ¶ added in v0.2.0 

func (s *CreateSubscriptionStatement) String() string

String returns a string representation of the CreateSubscriptionStatement.

type CreateUserStatement ¶ 

type CreateUserStatement struct {
	// Name of the user to be created.
	Name string

	// User's password.
	Password string

	// User's admin privilege.
	Admin bool
}

CreateUserStatement represents a command for creating a new user.

func (*CreateUserStatement) RequiredPrivileges ¶ 

func (s *CreateUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a CreateUserStatement.

func (*CreateUserStatement) String ¶ 

func (s *CreateUserStatement) String() string

String returns a string representation of the create user statement.

type DataType ¶ 

type DataType int

DataType represents the primitive data types available in InfluxQL.

func InspectDataType ¶ 

func InspectDataType(v interface{}) DataType

InspectDataType returns the data type of a given value.

func (DataType) String ¶ 

func (d DataType) String() string

type DeleteStatement ¶ 

type DeleteStatement struct {
	// Data source that values are removed from.
	Source Source

	// An expression evaluated on data point.
	Condition Expr
}

DeleteStatement represents a command for removing data from the database.

func (*DeleteStatement) RequiredPrivileges ¶ 

func (s *DeleteStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DeleteStatement.

func (*DeleteStatement) String ¶ 

func (s *DeleteStatement) String() string

String returns a string representation of the delete statement.

type Dimension ¶ 

type Dimension struct {
	Expr Expr
}

Dimension represents an expression that a select statement is grouped by.

func (*Dimension) String ¶ 

func (d *Dimension) String() string

String returns a string representation of the dimension.

type Dimensions ¶ 

type Dimensions []*Dimension

Dimensions represents a list of dimensions.

func (Dimensions) Normalize ¶ 

func (a Dimensions) Normalize() (time.Duration, []string)

Normalize returns the interval and tag dimensions separately. Returns 0 if no time interval is specified.

func (Dimensions) String ¶ 

func (a Dimensions) String() string

String returns a string representation of the dimensions.

type Distinct ¶ 

type Distinct struct {
	// Identifier following DISTINCT
	Val string
}

Distinct represents a DISTINCT expression.

func (*Distinct) NewCall ¶ 

func (d *Distinct) NewCall() *Call

NewCall returns a new call expression from this expressions.

func (*Distinct) String ¶ 

func (d *Distinct) String() string

String returns a string representation of the expression.

type DropContinuousQueryStatement ¶ 

type DropContinuousQueryStatement struct {
	Name     string
	Database string
}

DropContinuousQueryStatement represents a command for removing a continuous query.

func (*DropContinuousQueryStatement) RequiredPrivileges ¶ 

func (s *DropContinuousQueryStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a DropContinuousQueryStatement

func (*DropContinuousQueryStatement) String ¶ 

func (s *DropContinuousQueryStatement) String() string

String returns a string representation of the statement.

type DropDatabaseStatement ¶ 

type DropDatabaseStatement struct {
	// Name of the database to be dropped.
	Name string

	// IfExists indicates whether to return without error if the database
	// does not exists.
	IfExists bool
}

DropDatabaseStatement represents a command to drop a database.

func (*DropDatabaseStatement) RequiredPrivileges ¶ 

func (s *DropDatabaseStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropDatabaseStatement.

func (*DropDatabaseStatement) String ¶ 

func (s *DropDatabaseStatement) String() string

String returns a string representation of the drop database statement.

type DropMeasurementStatement ¶ 

type DropMeasurementStatement struct {
	// Name of the measurement to be dropped.
	Name string
}

DropMeasurementStatement represents a command to drop a measurement.

func (*DropMeasurementStatement) RequiredPrivileges ¶ 

func (s *DropMeasurementStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a DropMeasurementStatement

func (*DropMeasurementStatement) String ¶ 

func (s *DropMeasurementStatement) String() string

String returns a string representation of the drop measurement statement.

type DropRetentionPolicyStatement ¶ 

type DropRetentionPolicyStatement struct {
	// Name of the policy to drop.
	Name string

	// Name of the database to drop the policy from.
	Database string
}

DropRetentionPolicyStatement represents a command to drop a retention policy from a database.

func (*DropRetentionPolicyStatement) RequiredPrivileges ¶ 

func (s *DropRetentionPolicyStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropRetentionPolicyStatement.

func (*DropRetentionPolicyStatement) String ¶ 

func (s *DropRetentionPolicyStatement) String() string

String returns a string representation of the drop retention policy statement.

type DropSeriesStatement ¶ 

type DropSeriesStatement struct {
	// Data source that fields are extracted from (optional)
	Sources Sources

	// An expression evaluated on data point (optional)
	Condition Expr
}

DropSeriesStatement represents a command for removing a series from the database.

func (DropSeriesStatement) RequiredPrivileges ¶ 

func (s DropSeriesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropSeriesStatement.

func (*DropSeriesStatement) String ¶ 

func (s *DropSeriesStatement) String() string

String returns a string representation of the drop series statement.

type DropServerStatement ¶ added in v0.2.0 

type DropServerStatement struct {
	// ID of the node to be dropped.
	NodeID uint64
	// Force will force the server to drop even it it means losing data
	Force bool
}

DropServerStatement represents a command for removing a server from the cluster.

func (*DropServerStatement) RequiredPrivileges ¶ added in v0.2.0 

func (s *DropServerStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropServerStatement.

func (*DropServerStatement) String ¶ added in v0.2.0 

func (s *DropServerStatement) String() string

String returns a string representation of the drop series statement.

type DropSubscriptionStatement ¶ added in v0.2.0 

type DropSubscriptionStatement struct {
	Name            string
	Database        string
	RetentionPolicy string
}

DropSubscriptionStatement represents a command to drop a subscription to the incoming data stream.

func (*DropSubscriptionStatement) RequiredPrivileges ¶ added in v0.2.0 

func (s *DropSubscriptionStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropSubscriptionStatement

func (*DropSubscriptionStatement) String ¶ added in v0.2.0 

func (s *DropSubscriptionStatement) String() string

String returns a string representation of the DropSubscriptionStatement.

type DropUserStatement ¶ 

type DropUserStatement struct {
	// Name of the user to drop.
	Name string
}

DropUserStatement represents a command for dropping a user.

func (*DropUserStatement) RequiredPrivileges ¶ 

func (s *DropUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a DropUserStatement.

func (*DropUserStatement) String ¶ 

func (s *DropUserStatement) String() string

String returns a string representation of the drop user statement.

type DurationLiteral ¶ 

type DurationLiteral struct {
	Val time.Duration
}

DurationLiteral represents a duration literal.

func (*DurationLiteral) String ¶ 

func (l *DurationLiteral) String() string

String returns a string representation of the literal.

type ExecutionPrivilege ¶ 

type ExecutionPrivilege struct {
	// Admin privilege required.
	Admin bool

	// Name of the database.
	Name string

	// Database privilege required.
	Privilege Privilege
}

ExecutionPrivilege is a privilege required for a user to execute a statement on a database or resource.

type ExecutionPrivileges ¶ 

type ExecutionPrivileges []ExecutionPrivilege

ExecutionPrivileges is a list of privileges required to execute a statement.

type Expr ¶ 

type Expr interface {
	Node
	// contains filtered or unexported methods
}

Expr represents an expression that can be evaluated to a value.

func CloneExpr ¶ 

func CloneExpr(expr Expr) Expr

CloneExpr returns a deep copy of the expression.

func ParseExpr ¶ 

func ParseExpr(s string) (Expr, error)

ParseExpr parses an expression string and returns its AST representation.

func Reduce ¶ 

func Reduce(expr Expr, valuer Valuer) Expr

Reduce evaluates expr using the available values in valuer. References that don't exist in valuer are ignored.

type Field ¶ 

type Field struct {
	Expr  Expr
	Alias string
}

Field represents an expression retrieved from a select statement.

func (*Field) Name ¶ 

func (f *Field) Name() string

Name returns the name of the field. Returns alias, if set. Otherwise uses the function name or variable name.

func (*Field) String ¶ 

func (f *Field) String() string

String returns a string representation of the field.

type Fields ¶ 

type Fields []*Field

Fields represents a list of fields.

func (Fields) AliasNames ¶ added in v0.1.6 

func (a Fields) AliasNames() []string

AliasNames returns a list of calculated field names in order of alias, function name, then field.

func (Fields) Len ¶ 

func (f Fields) Len() int

Sort Interface for Fields

func (Fields) Less ¶ 

func (f Fields) Less(i, j int) bool

func (Fields) Names ¶ added in v0.1.6 

func (a Fields) Names() []string

Names returns a list of raw field names.

func (Fields) String ¶ 

func (a Fields) String() string

String returns a string representation of the fields.

func (Fields) Swap ¶ 

func (f Fields) Swap(i, j int)

type FillOption ¶ 

type FillOption int
const (
	// NullFill means that empty aggregate windows will just have null values.
	NullFill FillOption = iota
	// NoFill means that empty aggregate windows will be purged from the result.
	NoFill
	// NumberFill means that empty aggregate windows will be filled with the given number
	NumberFill
	// PreviousFill means that empty aggregate windows will be filled with whatever the previous aggregate window had
	PreviousFill
)

type GrantAdminStatement ¶ 

type GrantAdminStatement struct {
	// Who to grant the privilege to.
	User string
}

GrantAdminStatement represents a command for granting admin privilege.

func (*GrantAdminStatement) RequiredPrivileges ¶ 

func (s *GrantAdminStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a GrantAdminStatement.

func (*GrantAdminStatement) String ¶ 

func (s *GrantAdminStatement) String() string

String returns a string representation of the grant admin statement.

type GrantStatement ¶ 

type GrantStatement struct {
	// The privilege to be granted.
	Privilege Privilege

	// Database to grant the privilege to.
	On string

	// Who to grant the privilege to.
	User string
}

GrantStatement represents a command for granting a privilege.

func (*GrantStatement) RequiredPrivileges ¶ 

func (s *GrantStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a GrantStatement.

func (*GrantStatement) String ¶ 

func (s *GrantStatement) String() string

String returns a string representation of the grant statement.

type HasDefaultDatabase ¶ 

type HasDefaultDatabase interface {
	Node

	DefaultDatabase() string
	// contains filtered or unexported methods
}

HasDefaultDatabase provides an interface to get the default database from a Statement.

type Measurement ¶ 

type Measurement struct {
	Database        string
	RetentionPolicy string
	Name            string
	Regex           *RegexLiteral
	IsTarget        bool
}

Measurement represents a single measurement used as a datasource.

func (*Measurement) String ¶ 

func (m *Measurement) String() string

String returns a string representation of the measurement.

type Measurements ¶ 

type Measurements []*Measurement

Measurements represents a list of measurements.

func (Measurements) String ¶ 

func (a Measurements) String() string

String returns a string representation of the measurements.

type Node ¶ 

type Node interface {
	String() string
	// contains filtered or unexported methods
}

Node represents a node in the InfluxDB abstract syntax tree.

func Rewrite ¶ 

func Rewrite(r Rewriter, node Node) Node

Rewrite recursively invokes the rewriter to replace each node. Nodes are traversed depth-first and rewritten from leaf to root.

func RewriteFunc ¶ 

func RewriteFunc(node Node, fn func(Node) Node) Node

RewriteFunc rewrites a node hierarchy.

type NowValuer ¶ 

type NowValuer struct {
	Now time.Time
}

nowValuer returns only the value for "now()".

func (*NowValuer) Value ¶ 

func (v *NowValuer) Value(key string) (interface{}, bool)

type NumberLiteral ¶ 

type NumberLiteral struct {
	Val float64
}

NumberLiteral represents a numeric literal.

func (*NumberLiteral) String ¶ 

func (l *NumberLiteral) String() string

String returns a string representation of the literal.

type ParenExpr ¶ 

type ParenExpr struct {
	Expr Expr
}

ParenExpr represents a parenthesized expression.

func (*ParenExpr) String ¶ 

func (e *ParenExpr) String() string

String returns a string representation of the parenthesized expression.

type ParseError ¶ 

type ParseError struct {
	Message  string
	Found    string
	Expected []string
	Pos      Pos
}

ParseError represents an error that occurred during parsing.

func (*ParseError) Error ¶ 

func (e *ParseError) Error() string

Error returns the string representation of the error.

type Parser ¶ 

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

Parser represents an InfluxQL parser.

func NewParser ¶ 

func NewParser(r io.Reader) *Parser

NewParser returns a new instance of Parser.

func (*Parser) ParseExpr ¶ 

func (p *Parser) ParseExpr() (Expr, error)

ParseExpr parses an expression.

func (*Parser) ParseQuery ¶ 

func (p *Parser) ParseQuery() (*Query, error)

ParseQuery parses an InfluxQL string and returns a Query AST object.

func (*Parser) ParseStatement ¶ 

func (p *Parser) ParseStatement() (Statement, error)

ParseStatement parses an InfluxQL string and returns a Statement AST object.

type Pos ¶ 

type Pos struct {
	Line int
	Char int
}

Pos specifies the line and character position of a token. The Char and Line are both zero-based indexes.

type Privilege ¶ 

type Privilege int

Privilege is a type of action a user can be granted the right to use. 

const (
	// NoPrivileges means no privileges required / granted / revoked.
	NoPrivileges Privilege = iota
	// ReadPrivilege means read privilege required / granted / revoked.
	ReadPrivilege
	// WritePrivilege means write privilege required / granted / revoked.
	WritePrivilege
	// AllPrivileges means all privileges required / granted / revoked.
	AllPrivileges
)

func NewPrivilege ¶ 

func NewPrivilege(p Privilege) *Privilege

NewPrivilege returns an initialized *Privilege.

func (Privilege) String ¶ 

func (p Privilege) String() string

String returns a string representation of a Privilege.

type Processor ¶ 

type Processor func(values []interface{}) interface{}

func GetProcessor ¶ 

func GetProcessor(expr Expr, startIndex int) (Processor, int)

type Query ¶ 

type Query struct {
	Statements Statements
}

Query represents a collection of ordered statements.

func ParseQuery ¶ 

func ParseQuery(s string) (*Query, error)

ParseQuery parses a query string and returns its AST representation.

func (*Query) String ¶ 

func (q *Query) String() string

String returns a string representation of the query.

type RegexLiteral ¶ 

type RegexLiteral struct {
	Val *regexp.Regexp
}

RegexLiteral represents a regular expression.

func CloneRegexLiteral ¶ 

func CloneRegexLiteral(r *RegexLiteral) *RegexLiteral

CloneRegexLiteral returns a clone of the RegexLiteral.

func (*RegexLiteral) String ¶ 

func (r *RegexLiteral) String() string

String returns a string representation of the literal.

type Result ¶ 

type Result struct {
	// StatementID is just the statement's position in the query. It's used
	// to combine statement results if they're being buffered in memory.
	StatementID int `json:"-"`
	Series      models.Rows
	Err         error
}

Rows represents a list of rows that can be sorted consistently by name/tag. Result represents a resultset returned from a single statement.

func (*Result) MarshalJSON ¶ 

func (r *Result) MarshalJSON() ([]byte, error)

MarshalJSON encodes the result into JSON.

func (*Result) UnmarshalJSON ¶ 

func (r *Result) UnmarshalJSON(b []byte) error

UnmarshalJSON decodes the data into the Result struct

type RevokeAdminStatement ¶ 

type RevokeAdminStatement struct {
	// Who to revoke admin privilege from.
	User string
}

RevokeAdminStatement represents a command to revoke admin privilege from a user.

func (*RevokeAdminStatement) RequiredPrivileges ¶ 

func (s *RevokeAdminStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a RevokeAdminStatement.

func (*RevokeAdminStatement) String ¶ 

func (s *RevokeAdminStatement) String() string

String returns a string representation of the revoke admin statement.

type RevokeStatement ¶ 

type RevokeStatement struct {
	// The privilege to be revoked.
	Privilege Privilege

	// Database to revoke the privilege from.
	On string

	// Who to revoke privilege from.
	User string
}

RevokeStatement represents a command to revoke a privilege from a user.

func (*RevokeStatement) RequiredPrivileges ¶ 

func (s *RevokeStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a RevokeStatement.

func (*RevokeStatement) String ¶ 

func (s *RevokeStatement) String() string

String returns a string representation of the revoke statement.

type Rewriter ¶ 

type Rewriter interface {
	Rewrite(Node) Node
}

Rewriter can be called by Rewrite to replace nodes in the AST hierarchy. The Rewrite() function is called once per node.

type Scanner ¶ 

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

Scanner represents a lexical scanner for InfluxQL.

func NewScanner ¶ 

func NewScanner(r io.Reader) *Scanner

NewScanner returns a new instance of Scanner.

func (*Scanner) Scan ¶ 

func (s *Scanner) Scan() (tok Token, pos Pos, lit string)

Scan returns the next token and position from the underlying reader. Also returns the literal text read for strings, numbers, and duration tokens since these token types can have different literal representations.

func (*Scanner) ScanRegex ¶ 

func (s *Scanner) ScanRegex() (tok Token, pos Pos, lit string)

type SelectStatement ¶ 

type SelectStatement struct {
	// Expressions returned from the selection.
	Fields Fields

	// Target (destination) for the result of the select.
	Target *Target

	// Expressions used for grouping the selection.
	Dimensions Dimensions

	// Data sources that fields are extracted from.
	Sources Sources

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned. Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int

	// Maxiumum number of series to be returned. Unlimited if zero.
	SLimit int

	// Returns series starting at an offset from the first one.
	SOffset int

	// if it's a query for raw data values (i.e. not an aggregate)
	IsRawQuery bool

	// What fill option the select statement uses, if any
	Fill FillOption

	// The value to fill empty aggregate buckets with, if any
	FillValue interface{}
	// contains filtered or unexported fields
}

SelectStatement represents a command for extracting data from the database.

func (*SelectStatement) Clone ¶ 

func (s *SelectStatement) Clone() *SelectStatement

Clone returns a deep copy of the statement.

func (*SelectStatement) ColumnNames ¶ added in v0.2.0 

func (s *SelectStatement) ColumnNames() []string

ColumnNames will walk all fields and functions and return the appropriate field names for the select statement while maintaining order of the field names

func (*SelectStatement) FunctionCalls ¶ 

func (s *SelectStatement) FunctionCalls() []*Call

FunctionCalls returns the Call objects from the query

func (*SelectStatement) FunctionCallsByPosition ¶ added in v0.2.0 

func (s *SelectStatement) FunctionCallsByPosition() [][]*Call

FunctionCallsByPosition returns the Call objects from the query in the order they appear in the select statement

func (*SelectStatement) GroupByInterval ¶ 

func (s *SelectStatement) GroupByInterval() (time.Duration, error)

GroupByIterval extracts the time interval, if specified.

func (*SelectStatement) HasCountDistinct ¶ 

func (s *SelectStatement) HasCountDistinct() bool

func (*SelectStatement) HasDerivative ¶ 

func (s *SelectStatement) HasDerivative() bool

HasDerivative returns true if one of the function calls in the statement is a derivative aggregate

func (*SelectStatement) HasDimensionWildcard ¶ added in v0.1.6 

func (s *SelectStatement) HasDimensionWildcard() bool

HasDimensionWildcard returns whether or not the select statement has at least 1 wildcard in the dimensions aka `GROUP BY`

func (*SelectStatement) HasDistinct ¶ 

func (s *SelectStatement) HasDistinct() bool

func (*SelectStatement) HasFieldWildcard ¶ added in v0.1.6 

func (s *SelectStatement) HasFieldWildcard() bool

HasFieldWildcard returns whether or not the select statement has at least 1 wildcard in the fields

func (*SelectStatement) HasTimeFieldSpecified ¶ added in v0.2.0 

func (s *SelectStatement) HasTimeFieldSpecified() bool

HasTimeFieldSpecified will walk all fields and determine if the user explicitly asked for time This is needed to determine re-write behaviors for functions like TOP and BOTTOM

func (*SelectStatement) HasWildcard ¶ 

func (s *SelectStatement) HasWildcard() bool

HasWildcard returns whether or not the select statement has at least 1 wildcard

func (*SelectStatement) IsSimpleDerivative ¶ 

func (s *SelectStatement) IsSimpleDerivative() bool

IsSimpleDerivative return true if one of the function call is a derivative function with a variable ref as the first arg

func (*SelectStatement) LimitTagSets ¶ added in v0.2.0 

func (s *SelectStatement) LimitTagSets(a []*TagSet) []*TagSet

LimitTagSets returns a tag set list with SLIMIT and SOFFSET applied.

func (*SelectStatement) NamesInDimension ¶ added in v0.1.6 

func (s *SelectStatement) NamesInDimension() []string

NamesInDimension returns the field and tag names (idents) in the group by

func (*SelectStatement) NamesInSelect ¶ 

func (s *SelectStatement) NamesInSelect() []string

NamesInSelect returns the field and tag names (idents) in the select clause

func (*SelectStatement) NamesInWhere ¶ 

func (s *SelectStatement) NamesInWhere() []string

NamesInWhere returns the field and tag names (idents) referenced in the where clause

func (*SelectStatement) RequiredPrivileges ¶ 

func (s *SelectStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute the SelectStatement.

func (*SelectStatement) RewriteDistinct ¶ 

func (s *SelectStatement) RewriteDistinct()

RewriteDistinct rewrites the expression to be a call for map/reduce to work correctly This method assumes all validation has passed

func (*SelectStatement) RewriteWildcards ¶ 

func (s *SelectStatement) RewriteWildcards(fields Fields, dimensions Dimensions) *SelectStatement

RewriteWildcards returns the re-written form of the select statement. Any wildcard query fields are replaced with the supplied fields, and any wildcard GROUP BY fields are replaced with the supplied dimensions.

func (*SelectStatement) SetTimeRange ¶ 

func (s *SelectStatement) SetTimeRange(start, end time.Time) error

SetTimeRange sets the start and end time of the select statement to [start, end). i.e. start inclusive, end exclusive. This is used commonly for continuous queries so the start and end are in buckets.

func (*SelectStatement) SourceNames ¶ added in v0.2.0 

func (s *SelectStatement) SourceNames() []string

SourceNames returns a list of source names.

func (*SelectStatement) String ¶ 

func (s *SelectStatement) String() string

String returns a string representation of the select statement.

func (*SelectStatement) Substatement ¶ 

func (s *SelectStatement) Substatement(ref *VarRef) (*SelectStatement, error)

Substatement returns a single-series statement for a given variable reference.

func (*SelectStatement) TimeAscending ¶ added in v0.2.0 

func (s *SelectStatement) TimeAscending() bool

TimeAscending returns true if the time field is sorted in chronological order.

type SetPasswordUserStatement ¶ 

type SetPasswordUserStatement struct {
	// Plain Password
	Password string

	// Who to grant the privilege to.
	Name string
}

SetPasswordUserStatement represents a command for changing user password.

func (*SetPasswordUserStatement) RequiredPrivileges ¶ 

func (s *SetPasswordUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a SetPasswordUserStatement.

func (*SetPasswordUserStatement) String ¶ 

func (s *SetPasswordUserStatement) String() string

String returns a string representation of the set password statement.

type ShowContinuousQueriesStatement ¶ 

type ShowContinuousQueriesStatement struct{}

ShowContinuousQueriesStatement represents a command for listing continuous queries.

func (*ShowContinuousQueriesStatement) RequiredPrivileges ¶ 

func (s *ShowContinuousQueriesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowContinuousQueriesStatement.

func (*ShowContinuousQueriesStatement) String ¶ 

func (s *ShowContinuousQueriesStatement) String() string

String returns a string representation of the list continuous queries statement.

type ShowDatabasesStatement ¶ 

type ShowDatabasesStatement struct{}

ShowDatabasesStatement represents a command for listing all databases in the cluster.

func (*ShowDatabasesStatement) RequiredPrivileges ¶ 

func (s *ShowDatabasesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowDatabasesStatement

func (*ShowDatabasesStatement) String ¶ 

func (s *ShowDatabasesStatement) String() string

String returns a string representation of the list databases command.

type ShowDiagnosticsStatement ¶ 

type ShowDiagnosticsStatement struct {
	// Module
	Module string
}

ShowDiagnosticsStatement represents a command for show node diagnostics.

func (*ShowDiagnosticsStatement) RequiredPrivileges ¶ 

func (s *ShowDiagnosticsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowDiagnosticsStatement

func (*ShowDiagnosticsStatement) String ¶ 

func (s *ShowDiagnosticsStatement) String() string

String returns a string representation of the ShowDiagnosticsStatement.

type ShowFieldKeysStatement ¶ 

type ShowFieldKeysStatement struct {
	// Data sources that fields are extracted from.
	Sources Sources

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowFieldKeysStatement represents a command for listing field keys.

func (*ShowFieldKeysStatement) RequiredPrivileges ¶ 

func (s *ShowFieldKeysStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowFieldKeysStatement

func (*ShowFieldKeysStatement) String ¶ 

func (s *ShowFieldKeysStatement) String() string

String returns a string representation of the statement.

type ShowGrantsForUserStatement ¶ 

type ShowGrantsForUserStatement struct {
	// Name of the user to display privileges.
	Name string
}

ShowGrantsForUserStatement represents a command for listing user privileges.

func (*ShowGrantsForUserStatement) RequiredPrivileges ¶ 

func (s *ShowGrantsForUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowGrantsForUserStatement

func (*ShowGrantsForUserStatement) String ¶ 

func (s *ShowGrantsForUserStatement) String() string

String returns a string representation of the show grants for user.

type ShowMeasurementsStatement ¶ 

type ShowMeasurementsStatement struct {
	// Measurement name or regex.
	Source Source

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowMeasurementsStatement represents a command for listing measurements.

func (*ShowMeasurementsStatement) RequiredPrivileges ¶ 

func (s *ShowMeasurementsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowMeasurementsStatement

func (*ShowMeasurementsStatement) String ¶ 

func (s *ShowMeasurementsStatement) String() string

String returns a string representation of the statement.

type ShowRetentionPoliciesStatement ¶ 

type ShowRetentionPoliciesStatement struct {
	// Name of the database to list policies for.
	Database string
}

ShowRetentionPoliciesStatement represents a command for listing retention policies.

func (*ShowRetentionPoliciesStatement) RequiredPrivileges ¶ 

func (s *ShowRetentionPoliciesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowRetentionPoliciesStatement

func (*ShowRetentionPoliciesStatement) String ¶ 

func (s *ShowRetentionPoliciesStatement) String() string

String returns a string representation of a ShowRetentionPoliciesStatement.

type ShowSeriesStatement ¶ 

type ShowSeriesStatement struct {
	// Measurement(s) the series are listed for.
	Sources Sources

	// An expression evaluated on a series name or tag.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowSeriesStatement represents a command for listing series in the database.

func (*ShowSeriesStatement) RequiredPrivileges ¶ 

func (s *ShowSeriesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowSeriesStatement.

func (*ShowSeriesStatement) String ¶ 

func (s *ShowSeriesStatement) String() string

String returns a string representation of the list series statement.

type ShowServersStatement ¶ 

type ShowServersStatement struct{}

ShowServersStatement represents a command for listing all servers.

func (*ShowServersStatement) RequiredPrivileges ¶ 

func (s *ShowServersStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowServersStatement

func (*ShowServersStatement) String ¶ 

func (s *ShowServersStatement) String() string

String returns a string representation of the show servers command.

type ShowShardsStatement ¶ added in v0.2.0 

type ShowShardsStatement struct{}

ShowShardsStatement represents a command for displaying shards in the cluster.

func (*ShowShardsStatement) RequiredPrivileges ¶ added in v0.2.0 

func (s *ShowShardsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privileges required to execute the statement.

func (*ShowShardsStatement) String ¶ added in v0.2.0 

func (s *ShowShardsStatement) String() string

String returns a string representation.

type ShowStatsStatement ¶ 

type ShowStatsStatement struct {
	// Module
	Module string
}

ShowStats statement displays statistics for a given module.

func (*ShowStatsStatement) RequiredPrivileges ¶ 

func (s *ShowStatsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowStatsStatement

func (*ShowStatsStatement) String ¶ 

func (s *ShowStatsStatement) String() string

String returns a string representation of a ShowStatsStatement.

type ShowSubscriptionsStatement ¶ added in v0.2.0 

type ShowSubscriptionsStatement struct {
}

ShowSubscriptionsStatement represents a command to show a list of subscriptions.

func (*ShowSubscriptionsStatement) RequiredPrivileges ¶ added in v0.2.0 

func (s *ShowSubscriptionsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowSubscriptionStatement

func (*ShowSubscriptionsStatement) String ¶ added in v0.2.0 

func (s *ShowSubscriptionsStatement) String() string

String returns a string representation of the ShowSubscriptionStatement.

type ShowTagKeysStatement ¶ 

type ShowTagKeysStatement struct {
	// Data sources that fields are extracted from.
	Sources Sources

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of tag keys per measurement. Unlimited if zero.
	Limit int

	// Returns tag keys starting at an offset from the first row.
	Offset int

	// Maxiumum number of series to be returned. Unlimited if zero.
	SLimit int

	// Returns series starting at an offset from the first one.
	SOffset int
}

ShowTagKeysStatement represents a command for listing tag keys.

func (*ShowTagKeysStatement) RequiredPrivileges ¶ 

func (s *ShowTagKeysStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowTagKeysStatement

func (*ShowTagKeysStatement) String ¶ 

func (s *ShowTagKeysStatement) String() string

String returns a string representation of the statement.

type ShowTagValuesStatement ¶ 

type ShowTagValuesStatement struct {
	// Data source that fields are extracted from.
	Sources Sources

	// Tag key(s) to pull values from.
	TagKeys []string

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowTagValuesStatement represents a command for listing tag values.

func (*ShowTagValuesStatement) RequiredPrivileges ¶ 

func (s *ShowTagValuesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowTagValuesStatement

func (*ShowTagValuesStatement) String ¶ 

func (s *ShowTagValuesStatement) String() string

String returns a string representation of the statement.

type ShowUsersStatement ¶ 

type ShowUsersStatement struct{}

ShowUsersStatement represents a command for listing users.

func (*ShowUsersStatement) RequiredPrivileges ¶ 

func (s *ShowUsersStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowUsersStatement

func (*ShowUsersStatement) String ¶ 

func (s *ShowUsersStatement) String() string

String returns a string representation of the ShowUsersStatement.

type SortField ¶ 

type SortField struct {
	// Name of the field
	Name string

	// Sort order.
	Ascending bool
}

SortField represents a field to sort results by.

func (*SortField) String ¶ 

func (field *SortField) String() string

String returns a string representation of a sort field

type SortFields ¶ 

type SortFields []*SortField

SortFields represents an ordered list of ORDER BY fields

func (SortFields) String ¶ 

func (a SortFields) String() string

String returns a string representation of sort fields

type Source ¶ 

type Source interface {
	Node
	// contains filtered or unexported methods
}

Source represents a source of data for a statement.

type Sources ¶ 

type Sources []Source

Sources represents a list of sources.

func (Sources) String ¶ 

func (a Sources) String() string

String returns a string representation of a Sources array.

type Statement ¶ 

type Statement interface {
	Node

	RequiredPrivileges() ExecutionPrivileges
	// contains filtered or unexported methods
}

Statement represents a single command in InfluxQL.

func MustParseStatement ¶ 

func MustParseStatement(s string) Statement

MustParseStatement parses a statement string and returns its AST. Panic on error.

func ParseStatement ¶ 

func ParseStatement(s string) (Statement, error)

ParseStatement parses a statement string and returns its AST representation.

type Statements ¶ 

type Statements []Statement

Statements represents a list of statements.

func (Statements) String ¶ 

func (a Statements) String() string

String returns a string representation of the statements.

type StringLiteral ¶ 

type StringLiteral struct {
	Val string
}

StringLiteral represents a string literal.

func (*StringLiteral) String ¶ 

func (l *StringLiteral) String() string

String returns a string representation of the literal.

type TagSet ¶ 

type TagSet struct {
	Tags       map[string]string
	Filters    []Expr
	SeriesKeys []string
	Key        []byte
}

TagSet is a fundamental concept within the query system. It represents a composite series, composed of multiple individual series that share a set of tag attributes.

func (*TagSet) AddFilter ¶ 

func (t *TagSet) AddFilter(key string, filter Expr)

AddFilter adds a series-level filter to the Tagset.

type Target ¶ 

type Target struct {
	// Measurement to write into.
	Measurement *Measurement
}

Target represents a target (destination) policy, measurement, and DB.

func (*Target) String ¶ 

func (t *Target) String() string

String returns a string representation of the Target.

type TimeLiteral ¶ 

type TimeLiteral struct {
	Val time.Time
}

TimeLiteral represents a point-in-time literal.

func (*TimeLiteral) String ¶ 

func (l *TimeLiteral) String() string

String returns a string representation of the literal.

type Token ¶ 

type Token int

Token is a lexical token of the InfluxQL language. 

const (
	// Special tokens
	ILLEGAL Token = iota
	EOF
	WS

	// Literals
	IDENT        // main
	NUMBER       // 12345.67
	DURATION_VAL // 13h
	STRING       // "abc"
	BADSTRING    // "abc
	BADESCAPE    // \q
	TRUE         // true
	FALSE        // false
	REGEX        // Regular expressions
	BADREGEX     // `.*

	// Operators
	ADD // +
	SUB // -
	MUL // *
	DIV // /

	AND // AND
	OR  // OR

	EQ       // =
	NEQ      // !=
	EQREGEX  // =~
	NEQREGEX // !~
	LT       // <
	LTE      // <=
	GT       // >
	GTE      // >=

	LPAREN    // (
	RPAREN    // )
	COMMA     // ,
	COLON     // :
	SEMICOLON // ;
	DOT       // .

	// Keywords
	ALL
	ALTER
	ANY
	AS
	ASC
	BEGIN
	BY
	CREATE
	CONTINUOUS
	DATABASE
	DATABASES
	DEFAULT
	DELETE
	DESC
	DESTINATIONS
	DIAGNOSTICS
	DISTINCT
	DROP
	DURATION
	END
	EXISTS
	EXPLAIN
	FIELD
	FOR
	FORCE
	FROM
	GRANT
	GRANTS
	GROUP
	IF
	IN
	INF
	INNER
	INSERT
	INTO
	KEY
	KEYS
	LIMIT
	MEASUREMENT
	MEASUREMENTS
	NOT
	OFFSET
	ON
	ORDER
	PASSWORD
	POLICY
	POLICIES
	PRIVILEGES
	QUERIES
	QUERY
	READ
	REPLICATION
	RETENTION
	REVOKE
	SELECT
	SERIES
	SERVER
	SERVERS
	SET
	SHOW
	SHARDS
	SLIMIT
	SOFFSET
	STATS
	SUBSCRIPTION
	SUBSCRIPTIONS
	TAG
	TO
	USER
	USERS
	VALUES
	WHERE
	WITH
	WRITE
)

func Lookup ¶ 

func Lookup(ident string) Token

Lookup returns the token associated with a given string.

func (Token) Precedence ¶ 

func (tok Token) Precedence() int

Precedence returns the operator precedence of the binary operator token.

func (Token) String ¶ 

func (tok Token) String() string

String returns the string representation of the token.

type Valuer ¶ 

type Valuer interface {
	Value(key string) (interface{}, bool)
}

Valuer is the interface that wraps the Value() method.

Value returns the value and existence flag for a given key.

type VarRef ¶ 

type VarRef struct {
	Val string
}

VarRef represents a reference to a variable.

func (*VarRef) String ¶ 

func (r *VarRef) String() string

String returns a string representation of the variable reference.

type Visitor ¶ 

type Visitor interface {
	Visit(Node) Visitor
}

Visitor can be called by Walk to traverse an AST hierarchy. The Visit() function is called once per node.

type Wildcard ¶ 

type Wildcard struct{}

Wildcard represents a wild card expression.

func (*Wildcard) String ¶ 

func (e *Wildcard) String() string

String returns a string representation of the wildcard.

Source Files ¶

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