Hyperledger Fabric's chain code interface finishing

The 1.Chaincode interface must be implemented by all the code on the chain, and the fabric runs the transaction by invoking these specified functions

Call the INIT function to allow code on the chain to initialize internal data after the container has established a connection and then deploys the transaction

Init (stub chaincodestubinterface, function string, args []string) ([]byte, error)

Each call to the transaction invokes the Invoke interface. The code on the chain may change the state variable

Invoke (stub chaincodestubinterface, function string, args []string) ([]byte, error)

Invokes the query interface when querying transactions. The code on the chain simply reads (rather than modifies) its state variable and returns the result

Query (stub chaincodestubinterface, function string, args []string) ([]byte, error)

}

2. Chaincodestubinterface is used to deploy chained code apps to access and modify their ledger

Type Chaincodestubinterface Interface {

Get The arguments to the stub call as a 2D byte array

Gets the parameter of the stub call to act as a 2-D byte array

Getargs () [][]byte

Get The arguments to the stub call as a string array

Gets the parameter of the stub call to be used as a character array

Getstringargs () []string

Get the ID of the transaction

Gettxid () string

Invokechaincode locally invokes the specified chain code, ' invoke ' uses the same trade, and says the chain code is called

The code on the chain does not create a new trade message

Invokechaincode (Chaincodename string, args [][]byte) ([]byte, error)

Invokechaincode calls the specified chain code locally, ' Query ' uses the same trade, and it says the chain code is called

The code on the chain does not create a new trade message

Querychaincode (Chaincodename string, args [][]byte) ([]byte, error)

GetState to return specific values of an array by key

GetState (Key String) ([]byte, error)

Putstate write specific keys and values to the ledger

Putstate (key string, value []byte) error

Delstate remove the specified key and value from the Ledger

Delstate (key String) error

The Rangequerystate function can be used to query for keys in the state range through Chaincode. Suppose Startkey and EndKey

In the dictionary, an iterator is returned that can be used to traverse all the keys between Startkey and EndKey.

The order of the iterator return keys is random.

Rangequerystate (Startkey, EndKey string) (Staterangequeryiteratorinterface, error)

CreateTable Create a new table, give the table name and the column definition

CreateTable (name string, columndefinitions []*columndefinition) error

GetTable If a table exists, returns the specified table if the table does not exist Errtablenotfound error

GetTable (TableName string) (*table, error)

Deletetable Delete all rows related to the table and entity

Deletetable (TableName String) error

InsertRow insert a new line into the specified table

Returns

Returns true if the row successfully inserted and no error

Returns false and no error if a given row already exists

Returns FALSE if the specified table name does not exist and Tablenotfounderror

Returns false and error if an unexpected error condition occurs

InsertRow (TableName string, row row) (bool, error)

Replacerow updates the row in the specified table.

Returns

Returns false and no error if the row is updated successfully

Returns false and no error if the given row does not have a corresponding key

Returns FALSE if the specified table name does not exist and Tablenotfounderror

Returns false and error if an unexpected error condition occurs

Replacerow (TableName string, row row) (bool, error)

Fetching rows from a specified table by key

GetRow (TableName string, key []column) (Row, error)

Returns multiple rows based on a specific key. For example, give a table | A | B | C | D |,a,c and D are keys, you can use [A,c] to call GetRows to return all with a,

C and any D-value rows as their keys. GetRows can also use a call to return all rows with a and C and D as their key values.

GetRows (TableName string, key []column) (<-chan Row, error)

DeleteRow deletes a specific row from the specified table by key

DeleteRow (TableName string, key []column) error

Readcertattribute used to read the specified attribute from the transaction certificate

*attributename* is the entry for this function.

For example:

  attrvalue,error:=stub. Readcertattribute ("position")

Readcertattribute (AttributeName string) ([]byte, error)

Verifyattribute is used to verify that the transaction certificate has a property named * Attribute name * and value * AttributeValue *.

AttributeName and AttributeValue are input parameters that are received by this function

For example:

    containsattr, Error: = Stub. Verifyattribute ("position", "software Engineer")

Verifyattribute (AttributeName string, AttributeValue []byte) (bool, error)

Verifyattributes is the same as Verifyattribute, but it examines the list of attributes and their corresponding values instead of a single property/value pair

For example:

    Containsattrs, error:= stub. Verifyattributes (&attr. attribute{"position",  "Software Engineer"}, &attr. Attribute{"Company", "Acompany"})

Verifyattributes (Attrs ... *attr. Attribute) (bool, error)

VerifySignature Verify the signature of the transaction, or return False if True is returned correctly

VerifySignature (certificate, signature, message []byte) (bool, error)

Getcallercertificate Return Caller Certificate

Getcallercertificate () ([]byte, error)

Getcallermetadata Returning caller metadata

Getcallermetadata () ([]byte, error)

Getbinding return Trade Bundle

Getbinding () ([]byte, error)

Getpayload returns the payload of the transaction, payload is a definition in Fabric/protos/chaincode.proto

Chaincodespecwhich in the

Getpayload () ([]byte,