aws-0.24.2: Amazon Web Services (AWS) for Haskell
CopyrightSoostone Inc Chris Allen
LicenseBSD3
MaintainerOzgun Ataman <ozgun.ataman@soostone.com>
Stabilityexperimental
Safe HaskellNone
LanguageHaskell2010

Aws.DynamoDb.Core

Description

Shared types and utilities for DyanmoDb functionality.

Synopsis

Configuration and Regions

data Region #

Constructors

Region 

Instances

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Read Region # 
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Show Region # 
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Eq Region # 
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Methods

(==) :: Region -> Region -> Bool #

(/=) :: Region -> Region -> Bool #

ddbLocal :: Region #

DynamoDb local connection (for development)

data DdbConfiguration qt #

Constructors

DdbConfiguration 

Fields

DynamoDB values

data DValue #

Value types natively recognized by DynamoDb. We pretty much exactly reflect the AWS API onto Haskell types.

Constructors

DNull 
DNum Scientific 
DString Text 
DBinary ByteString

Binary data will automatically be base64 marshalled.

DNumSet (Set Scientific) 
DStringSet (Set Text) 
DBinSet (Set ByteString)

Binary data will automatically be base64 marshalled.

DBool Bool 
DBoolSet (Set Bool)

Composite data

DList (Vector DValue) 
DMap (Map Text DValue) 

Instances

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FromJSON DValue # 
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ToJSON DValue # 
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DynData DValue # 
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DynSize DValue # 
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dynSize :: DValue -> Int #

DynSize Item # 
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dynSize :: Item -> Int #

DynVal DValue # 
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Associated Types

type DynRep DValue 
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FromDynItem Item # 
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parseItem :: Item -> Parser Item #

ToDynItem Item # 
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toItem :: Item -> Item #

IsString DValue # 
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fromString :: String -> DValue #

Read DValue # 
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Show DValue # 
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Eq DValue # 
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(==) :: DValue -> DValue -> Bool #

(/=) :: DValue -> DValue -> Bool #

Ord DValue # 
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ListResponse QueryResponse Item # 
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ListResponse ScanResponse Item # 
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type DynRep DValue # 
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Converting to/from DValue

class DynData (DynRep a) => DynVal a where #

Class of Haskell types that can be represented as DynamoDb values.

This is the conversion layer; instantiate this class for your own types and then use the toValue and fromValue combinators to convert in application code.

Each Haskell type instantiated with this class will map to a DynamoDb-supported type that most naturally represents it.

Associated Types

type DynRep a #

Which of the DynData instances does this data type directly map to?

Methods

toRep :: a -> DynRep a #

Convert to representation

fromRep :: DynRep a -> Maybe a #

Convert from representation

Instances

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DynVal DValue # 
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type DynRep DValue 
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DynVal OldBool # 
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type DynRep OldBool 
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DynVal Int16 # 
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type DynRep Int16 
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DynVal Int32 # 
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type DynRep Int32 
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DynVal Int64 # 
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type DynRep Int64 
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DynVal Int8 # 
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type DynRep Int8 
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DynVal Word16 # 
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type DynRep Word16 
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DynVal Word32 # 
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type DynRep Word32 
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DynVal Word64 # 
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type DynRep Word64 
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DynVal Word8 # 
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type DynRep Word8 
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DynVal ByteString # 
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type DynRep ByteString 
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DynVal Text # 
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type DynRep Text 
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DynVal Day #

Encoded as number of days

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type DynRep Day 
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DynVal UTCTime #

Losslessly encoded via Integer picoseconds

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type DynRep UTCTime 
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DynVal Integer # 
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type DynRep Integer 
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DynVal Bool # 
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type DynRep Bool 
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DynVal Double # 
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type DynRep Double 
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DynVal Int # 
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type DynRep Int 
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Serialize a => DynVal (Bin a) # 
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type DynRep (Bin a) 
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type DynRep (Bin a) = DynBinary

Methods

toRep :: Bin a -> DynRep (Bin a) #

fromRep :: DynRep (Bin a) -> Maybe (Bin a) #

(DynData (DynRep (Set a)), DynVal a, Ord a) => DynVal (Set a) #

Any singular DynVal can be upgraded to a Set.

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type DynRep (Set a) 
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type DynRep (Set a) = Set (DynRep a)

Methods

toRep :: Set a -> DynRep (Set a) #

fromRep :: DynRep (Set a) -> Maybe (Set a) #

(DynData (DynRep [a]), DynVal a) => DynVal [a] #

Any singular DynVal can be upgraded to a list.

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type DynRep [a] 
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type DynRep [a] = Set (DynRep a)

Methods

toRep :: [a] -> DynRep [a] #

fromRep :: DynRep [a] -> Maybe [a] #

toValue :: DynVal a => a -> DValue #

Encode a Haskell value.

fromValue :: DynVal a => DValue -> Maybe a #

Decode a Haskell value.

newtype Bin a #

Type wrapper for binary data to be written to DynamoDB. Wrap any Serialize instance in there and DynVal will know how to automatically handle conversions in binary form.

Constructors

Bin 

Fields

Instances

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Serialize a => DynVal (Bin a) # 
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type DynRep (Bin a) 
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type DynRep (Bin a) = DynBinary

Methods

toRep :: Bin a -> DynRep (Bin a) #

fromRep :: DynRep (Bin a) -> Maybe (Bin a) #

Enum a => Enum (Bin a) # 
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Methods

succ :: Bin a -> Bin a #

pred :: Bin a -> Bin a #

toEnum :: Int -> Bin a #

fromEnum :: Bin a -> Int #

enumFrom :: Bin a -> [Bin a] #

enumFromThen :: Bin a -> Bin a -> [Bin a] #

enumFromTo :: Bin a -> Bin a -> [Bin a] #

enumFromThenTo :: Bin a -> Bin a -> Bin a -> [Bin a] #

Read a => Read (Bin a) # 
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Show a => Show (Bin a) # 
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showsPrec :: Int -> Bin a -> ShowS #

show :: Bin a -> String #

showList :: [Bin a] -> ShowS #

Eq a => Eq (Bin a) # 
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Methods

(==) :: Bin a -> Bin a -> Bool #

(/=) :: Bin a -> Bin a -> Bool #

Ord a => Ord (Bin a) # 
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Methods

compare :: Bin a -> Bin a -> Ordering #

(<) :: Bin a -> Bin a -> Bool #

(<=) :: Bin a -> Bin a -> Bool #

(>) :: Bin a -> Bin a -> Bool #

(>=) :: Bin a -> Bin a -> Bool #

max :: Bin a -> Bin a -> Bin a #

min :: Bin a -> Bin a -> Bin a #

type DynRep (Bin a) # 
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type DynRep (Bin a) = DynBinary

newtype OldBool #

Constructors

OldBool Bool 

Instances

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DynVal OldBool # 
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type DynRep OldBool 
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type DynRep OldBool # 
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Defining new DynVal instances

class Ord a => DynData a where #

An internally used closed typeclass for values that have direct DynamoDb representations. Based on AWS API, this is basically numbers, strings and binary blobs.

This is here so that any DynVal haskell value can automatically be lifted to a list or a Set without any instance code duplication.

Do not try to create your own instances.

Methods

fromData :: a -> DValue #

toData :: DValue -> Maybe a #

Instances

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DynData DValue # 
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DynData DynBinary # 
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DynData DynBool # 
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DynData DynNumber # 
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DynData DynString # 
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DynData (Set DynBinary) # 
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DynData (Set DynBool) # 
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DynData (Set DynNumber) # 
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DynData (Set DynString) # 
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newtype DynBinary #

Binary values stored in DynamoDb. Only used in defining new DynVal instances.

Constructors

DynBinary 

Instances

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DynData DynBinary # 
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Read DynBinary # 
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Show DynBinary # 
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Eq DynBinary # 
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Ord DynBinary # 
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DynData (Set DynBinary) # 
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newtype DynNumber #

Numeric values stored in DynamoDb. Only used in defining new DynVal instances.

Constructors

DynNumber 

Instances

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DynData DynNumber # 
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Read DynNumber # 
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Show DynNumber # 
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Eq DynNumber # 
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Ord DynNumber # 
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DynData (Set DynNumber) # 
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newtype DynString #

String values stored in DynamoDb. Only used in defining new DynVal instances.

Constructors

DynString 

Fields

Instances

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DynData DynString # 
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Read DynString # 
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Show DynString # 
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Eq DynString # 
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Ord DynString # 
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DynData (Set DynString) # 
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newtype DynBool #

Boolean values stored in DynamoDb. Only used in defining new DynVal instances.

Constructors

DynBool 

Fields

Instances

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DynData DynBool # 
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Read DynBool # 
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Show DynBool # 
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Eq DynBool # 
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(==) :: DynBool -> DynBool -> Bool #

(/=) :: DynBool -> DynBool -> Bool #

Ord DynBool # 
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DynData (Set DynBool) # 
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Working with key/value pairs

data Attribute #

A key-value pair

Constructors

Attribute 

Fields

parseAttributeJson :: Value -> Parser [Attribute] #

Parse a JSON object that contains attributes

attributeJson :: Attribute -> Pair #

Convert into JSON pair

attributesJson :: [Attribute] -> Value #

Convert into JSON object for AWS.

attrTuple :: Attribute -> (Text, DValue) #

Convert attribute to a tuple representation

attr :: DynVal a => Text -> a -> Attribute #

Convenience function for constructing key-value pairs

attrAs :: DynVal a => Proxy a -> Text -> a -> Attribute #

attr with type witness to help with cases where you're manually supplying values in code.

> item [ attrAs text "name" "john" ]

text :: Proxy Text #

Type witness for Text. See attrAs.

int :: Proxy Integer #

Type witness for Integer. See attrAs.

double :: Proxy Double #

Type witness for Double. See attrAs.

data PrimaryKey #

Primary keys consist of either just a Hash key (mandatory) or a hash key and a range key (optional).

Constructors

PrimaryKey 

hk :: Text -> DValue -> PrimaryKey #

Construct a hash-only primary key.

>>> hk "user-id" "ABCD"
>>> hk "user-id" (mkVal 23)

hrk #

Arguments

:: Text

Hash key name

-> DValue

Hash key value

-> Text

Range key name

-> DValue

Range key value

-> PrimaryKey 

Construct a hash-and-range primary key.

Working with objects (attribute collections)

type Item = Map Text DValue #

A DynamoDb object is simply a key-value dictionary.

item :: [Attribute] -> Item #

Pack a list of attributes into an Item.

attributes :: Map Text DValue -> [Attribute] #

Unpack an Item into a list of attributes.

class ToDynItem a where #

Types convertible to DynamoDb Item collections.

Use attr and attrAs combinators to conveniently define instances.

Methods

toItem :: a -> Item #

Instances

Instances details
ToDynItem Item # 
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toItem :: Item -> Item #

DynVal a => ToDynItem [(Text, a)] # 
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Methods

toItem :: [(Text, a)] -> Item #

DynVal a => ToDynItem (Map Text a) # 
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Methods

toItem :: Map Text a -> Item #

class FromDynItem a where #

Types parseable from DynamoDb Item collections.

User getAttr family of functions to applicatively or monadically parse into your custom types.

Methods

parseItem :: Item -> Parser a #

Instances

Instances details
FromDynItem Item # 
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parseItem :: Item -> Parser Item #

(Typeable a, DynVal a) => FromDynItem [(Text, a)] # 
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parseItem :: Item -> Parser [(Text, a)] #

(Typeable a, DynVal a) => FromDynItem (Map Text a) # 
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Methods

parseItem :: Item -> Parser (Map Text a) #

fromItem :: FromDynItem a => Item -> Either String a #

Parse an Item into target type using the FromDynItem instance.

newtype Parser a #

A continuation-based parser type.

Constructors

Parser 

Fields

Instances

Instances details
MonadFail Parser # 
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Methods

fail :: String -> Parser a #

Alternative Parser # 
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Methods

empty :: Parser a #

(<|>) :: Parser a -> Parser a -> Parser a #

some :: Parser a -> Parser [a] #

many :: Parser a -> Parser [a] #

Applicative Parser # 
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pure :: a -> Parser a #

(<*>) :: Parser (a -> b) -> Parser a -> Parser b #

liftA2 :: (a -> b -> c) -> Parser a -> Parser b -> Parser c #

(*>) :: Parser a -> Parser b -> Parser b #

(<*) :: Parser a -> Parser b -> Parser a #

Functor Parser # 
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fmap :: (a -> b) -> Parser a -> Parser b #

(<$) :: a -> Parser b -> Parser a #

Monad Parser # 
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(>>=) :: Parser a -> (a -> Parser b) -> Parser b #

(>>) :: Parser a -> Parser b -> Parser b #

return :: a -> Parser a #

MonadPlus Parser # 
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Methods

mzero :: Parser a #

mplus :: Parser a -> Parser a -> Parser a #

Monoid (Parser a) # 
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Methods

mempty :: Parser a #

mappend :: Parser a -> Parser a -> Parser a #

mconcat :: [Parser a] -> Parser a #

Semigroup (Parser a) # 
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Methods

(<>) :: Parser a -> Parser a -> Parser a #

sconcat :: NonEmpty (Parser a) -> Parser a #

stimes :: Integral b => b -> Parser a -> Parser a #

getAttr #

Arguments

:: (Typeable a, DynVal a) 
=> Text

Attribute name

-> Item

Item from DynamoDb

-> Parser a 

Convenience combinator for parsing fields from an Item returned by DynamoDb.

getAttr' #

Arguments

:: DynVal a 
=> Text

Attribute name

-> Item

Item from DynamoDb

-> Parser (Maybe a) 

Parse attribute if it's present in the Item. Fail if attribute is present but conversion fails.

parseAttr #

Arguments

:: FromDynItem a 
=> Text

Attribute name

-> Item

Item from DynamoDb

-> Parser a 

Combinator for parsing an attribute into a FromDynItem.

Common types used by operations

data Conditions #

Conditions used by mutation operations (PutItem, UpdateItem, etc.). The default def instance is empty (no condition).

conditionsJson :: Text -> Conditions -> [Pair] #

JSON encoding of conditions parameter in various contexts.

data Condition #

A condition used by mutation operations (PutItem, UpdateItem, etc.).

Constructors

Condition 

Fields

data CondOp #

Conditional operation to perform on a field.

Instances

Instances details
ToJSON CondOp # 
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Read CondOp # 
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Show CondOp # 
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Eq CondOp # 
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(==) :: CondOp -> CondOp -> Bool #

(/=) :: CondOp -> CondOp -> Bool #

Ord CondOp # 
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data CondMerge #

How to merge multiple conditions.

Constructors

CondAnd 
CondOr 

data ConsumedCapacity #

The standard response metrics on capacity consumption.

data ReturnConsumption #

Constructors

RCIndexes 
RCTotal 
RCNone 

Instances

Instances details
ToJSON ReturnConsumption # 
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Read ReturnConsumption # 
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Show ReturnConsumption # 
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Default ReturnConsumption # 
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Eq ReturnConsumption # 
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Ord ReturnConsumption # 
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data ItemCollectionMetrics #

Constructors

ItemCollectionMetrics 

Fields

Instances

Instances details
FromJSON ItemCollectionMetrics # 
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Read ItemCollectionMetrics # 
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Show ItemCollectionMetrics # 
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Eq ItemCollectionMetrics # 
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Ord ItemCollectionMetrics # 
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data ReturnItemCollectionMetrics #

Constructors

RICMSize 
RICMNone 

Instances

Instances details
ToJSON ReturnItemCollectionMetrics # 
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Read ReturnItemCollectionMetrics # 
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Show ReturnItemCollectionMetrics # 
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Default ReturnItemCollectionMetrics # 
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Eq ReturnItemCollectionMetrics # 
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Ord ReturnItemCollectionMetrics # 
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data UpdateReturn #

What to return from the current update operation

Constructors

URNone

Return nothing

URAllOld

Return old values

URUpdatedOld

Return old values with a newer replacement

URAllNew

Return new values

URUpdatedNew

Return new values that were replacements

data QuerySelect #

What to return from a Query or Scan query.

Constructors

SelectSpecific [Text]

Only return selected attributes

SelectCount

Return counts instead of attributes

SelectProjected

Return index-projected attributes

SelectAll

Default. Return everything.

Size estimation

class DynSize a where #

A class to help predict DynamoDb size of values, attributes and entire items. The result is given in number of bytes.

Methods

dynSize :: a -> Int #

Instances

Instances details
DynSize AttributeUpdate # 
Instance details

Defined in Aws.DynamoDb.Commands.UpdateItem

DynSize Attribute # 
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Methods

dynSize :: Attribute -> Int #

DynSize DValue # 
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Methods

dynSize :: DValue -> Int #

DynSize Item # 
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Methods

dynSize :: Item -> Int #

DynSize a => DynSize (Maybe a) # 
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Methods

dynSize :: Maybe a -> Int #

DynSize a => DynSize [a] # 
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Methods

dynSize :: [a] -> Int #

(DynSize a, DynSize b) => DynSize (Either a b) # 
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Methods

dynSize :: Either a b -> Int #

nullAttr :: Attribute -> Bool #

Will an attribute be considered empty by DynamoDb?

A PutItem (or similar) with empty attributes will be rejected with a ValidationException.

Responses & Errors

data DdbResponse #

Response metadata that is present in every DynamoDB response.

Constructors

DdbResponse 

Instances

Instances details
Loggable DdbResponse # 
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Monoid DdbResponse # 
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Semigroup DdbResponse # 
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shouldRetry :: DdbErrCode -> Bool #

Whether the action should be retried based on the received error.

data DdbError #

Potential errors raised by DynamoDB

Constructors

DdbError 

Fields

Instances

Instances details
Exception DdbError # 
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Show DdbError # 
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Eq DdbError # 
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Internal Helpers

data AmazonError #

Constructors

AmazonError 

Fields

Instances

Instances details
FromJSON AmazonError # 
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