Free calls update

README.md

@@ -147,29 +147,53 @@ visit the [Payment](#payment) section.
 
 ## Payment
 
-### Free call 
+When creating a service client, you can select a payment strategy using the `payment_strategy_type` parameter:
 
-If you want to use the free calls you will need to pass these arguments to the `create_service_client()` method:
+```python
+from snet.sdk import PaymentStrategyType
 
-```python    
-free_call_auth_token_bin = "f2548d27ffd319b9c05918eeac15ebab934e5cfcd68e1ec3db2b92765",
-free_call_token_expiry_block = 172800,
-email = "test@test.com" # which using in AI marketplace account
+payment_strategy_type = PaymentStrategyType.<NAME>
 ```
 
-You can receive these for a given service from the [Dapp](https://beta.singularitynet.io/)
+These are four payment strategies:
+
+- `PaymentStrategyType.DEFAULT`
+- `PaymentStrategyType.FREE_CALL`
+- `PaymentStrategyType.PAID_CALL`
+- `PaymentStrategyType.PREPAID_CALL`
+
+The default payment strategy selects one of the other three each time the service is called, depending on the 
+availability of free calls, as well as the presence of parameters required for concurrent calls. While choosing 
+a specific payment strategy will not allow you to switch to another. This is especially convenient when you want 
+to use free calls without accidentally spending money.
 
+> Note: If you don't specify еру `payment_strategy_type` parameter, the default payment strategy will be used.
+
+### Free call 
+
+If you want to use the free calls you will need to choose `PaymentStrategyType.FREE_CALL` as the payment strategy type.
 Creating a service client with free calls included would look like this:
+
 ```python
 service_client = snet_sdk.create_service_client(org_id="26072b8b6a0e448180f8c0e702ab6d2f", 
-                                                service_id="Exampleservice"
-                                                free_call_auth_token_bin="f2548d27ffd319b9c05918eeac15ebab934e5cfcd68e1ec3db2b92765",
-                                                free_call_token_expiry_block=172800,
-                                                email="test@mail.com")
+                                                service_id="Exampleservice",
+                                                payment_strategy_type = PaymentStrategyType.FREE_CALL)
 ```
 
 ### Paid call
 
+If you want to use regular paid calls you will need to choose `PaymentStrategyType.PAID_CALL` as the payment strategy type.
+Creating a service client with paid calls would look like this:
+
+```python
+service_client = snet_sdk.create_service_client(org_id="26072b8b6a0e448180f8c0e702ab6d2f", 
+                                                service_id="Exampleservice",
+                                                payment_strategy_type = PaymentStrategyType.PAID_CALL)
+```
+
+There is no need to call functions for interacting with payment channels, because they are automatically 
+managed by the SDK. But anyway you can use them if you want.
+
 #### Open channel with the specified amount of funds and expiration
 
 `open_channel()`[[1]](#1-this-method-uses-a-call-to-a-paid-smart-contract-function) opens a payment channel with the specified amount of AGIX tokens in cogs and expiration time. 
@@ -209,15 +233,20 @@ payment_channel.extend_and_add_funds(amount=123456, expiration=33333)
 
 ### Concurrent (Prepaid) call
 
-Concurrent (prepaid) calls allow you to prepay for a batch of service calls in advance. This off-chain strategy is ideal for scenarios requiring high throughput and low latency. Unlike regular paid calls, the payment is done once upfront, and the SDK automatically manages the channel during usage.
+Concurrent (prepaid) calls allow you to prepay for a batch of service calls in advance. This off-chain strategy 
+is ideal for scenarios requiring high throughput and low latency. Unlike regular paid calls, the payment is done 
+once upfront, and the SDK automatically manages the channel during usage.
 
-To use concurrent prepaid calls, specify the `concurrent_calls` parameter when creating a service client:
+If you want to use prepaid calls you will need to choose `PaymentStrategyType.PREPAID_CALL` as the payment strategy type
+as well as pass the number of concurrent calls as the `concurrent_calls` parameter. Creating a service client with 
+prepaid calls would look like this:
 
 ```python
 service_client = snet_sdk.create_service_client(
     org_id="26072b8b6a0e448180f8c0e702ab6d2f",
     service_id="Exampleservice",
     group_name="default_group",
+    payment_strategy_type=PaymentStrategyType.PREPAID_CALL,
     concurrent_calls=5  # Number of prepaid calls to allocate
 )
 ```

docs/main/init.md

@@ -3,7 +3,8 @@
 [Link](https://github.com/singnet/snet-sdk-python/blob/master/snet/sdk/__init__.py) to GitHub
 
 Entities:
-1. [SnetSDK](#class-snetsdk)
+1. [PaymentStrategyType](#class-paymentstrategytype)
+2. [SnetSDK](#class-snetsdk)
    - [\_\_init\_\_](#__init__)
    - [create_service_client](#create_service_client)
    - [get_service_stub](#get_service_stub)
@@ -15,6 +16,24 @@ Entities:
    - [get_organization_list](#get_organization_list)
    - [get_services_list](#get_services_list)
 
+### Class `PaymentStrategyType`
+
+extends: `Enum`
+
+is extended by: -
+
+#### description
+
+This is an `enum` that represents the available payment strategies. It is used to determine which payment 
+strategy to use when initializing the SDK.
+
+#### members
+
+- `DEFAULT`
+- `FREE_CALL`
+- `PAID_CALL`
+- `PREPAID_CALL`
+
 ### Class `SnetSDK`
 
 extends: -
@@ -73,8 +92,8 @@ of the `ServiceClient` class with all the required parameters, which is then ret
 - `service_id` (str): The ID of the service.
 - `group_name` (str): The name of the payment group. Defaults to _None_.
 - `payment_strategy` (PaymentStrategy): The payment channel management strategy. Defaults to _None_.
-- `free_call_auth_token_bin` (str): The free call authentication token in binary format. Defaults to _None_.
-- `free_call_token_expiry_block` (int): The block number when the free call token expires. Defaults to _None_.
+- `payment_strategy_type` (PaymentStrategyType): The type of payment management strategy. 
+Defaults to `PaymentStrategyType.DEFAULT`.
 - `options` (dict): Additional options for the service client. Defaults to _None_.
 - `concurrent_calls` (int): The number of concurrent calls allowed. Defaults to 1.
 

docs/payment_strategies/freecall_payment_strategy.md

@@ -4,9 +4,10 @@
 
 Entities:
 1. [FreeCallPaymentStrategy](#class-freecallpaymentstrategy)
-   - [is_free_call_available](#is_free_call_available)
+   - [get_free_calls_available](#get_free_calls_available)
    - [get_payment_metadata](#get_payment_metadata)
    - [generate_signature](#generate_signature)
+   - [get_free_call_token_details](#get_free_call_token_details)
 
 ### Class `FreeCallPaymentStrategy`
 
@@ -17,28 +18,29 @@ is extended by: -
 #### description
 
 The `FreeCallPaymentStrategy` class is a concrete implementation of the `PaymentStrategy` interface.
-It allows you to use free calls (which can be received from the [Dapp](https://beta.singularitynet.io/)) to 
+It allows you to use free calls (which can be received from the daemon) to 
 call services. 
 
 #### methods
 
-#### `is_free_call_available`
+#### `get_free_calls_available`
 
-Checks if a free call is available for a given service client.
+Using grpc calls to the daemon, it gets a free call token, and also gets and returns the number of free calls 
+available.
 
 ###### args:
 
 - `service_client` (ServiceClient): The service client instance.
 
 ###### returns:
 
-- True if a free call is available, False otherwise. (bool)
+- Amount of free calls available. (int)
 
 ###### raises:
 
 -  Exception: If an error occurs while checking the free call availability.
 
-_Note_: If any exception occurs during the process, it returns False.
+_Note_: If an error occurs specifically during the grpc call to `GetFreeCallsAvailable`, 0 will be returned.
 
 #### `get_payment_metadata`
 
@@ -60,6 +62,8 @@ Generates a signature for the given service client using the provided free call
 ###### args:
 
 - `service_client` (ServiceClient): The service client instance.
+- `current_block_number` (int, optional): The current block number. Defaults to _None_.
+- `with_token` (bool, optional): Whether to include the free call token in the signature. Defaults to _True_.
 
 ###### returns:
 
@@ -68,3 +72,20 @@ Generates a signature for the given service client using the provided free call
 ###### raises:
 
 - Exception: If any of the required parameters for the free call strategy are missing.
+
+#### `get_free_call_token_details`
+
+Sends a request to the daemon and receives a free call token and its details.
+
+###### args:
+
+- `service_client` (ServiceClient): The service client instance.
+- `current_block_number` (int, optional): The current block number. Defaults to _None_.
+
+###### returns:
+
+- A tuple containing the free call token and the token expiration block number. (tuple[str, int])
+
+###### raises:
+
+- Exception: If an error occurred while receiving the token.

requirements.txt

@@ -1,22 +1,12 @@
-protobuf==4.21.6
-grpcio-tools==1.59.0
-wheel==0.41.2
-jsonrpcclient==4.0.3
-eth-hash==0.5.2
-rlp==3.0.0
-eth-rlp==0.3.0
-web3==6.11.1
-mnemonic==0.20
-pycoin==0.92.20230326
-pyyaml==6.0.1
-ipfshttpclient==0.4.13.2
-rfc3986==2.0.0
-pymultihash==0.8.2
-base58==2.1.1
-argcomplete==3.1.2
-grpcio-health-checking==1.59.0
-jsonschema==4.0.0
-eth-account==0.9.0
-snet-contracts==1.0.0
-lighthouseweb3==0.1.4
-zipp>=3.19.1
+protobuf==5.*
+grpcio-tools>=1.71.0
+wheel>=0.45.0
+rlp>=4.1.0
+web3==7.*
+ipfshttpclient==0.4.13
+rfc3986>=2.0.0
+base58>=2.1.1
+grpcio-health-checking>=1.71.0
+snet-contracts==1.0.1
+lighthouseweb3>=0.1.4
+pymultihash==0.*

snet/sdk/__init__.py

@@ -2,6 +2,7 @@
 import os
 import sys
 import warnings
+from enum import Enum
 
 import google.protobuf.internal.api_implementation
 
@@ -26,18 +27,28 @@
 from snet.sdk.client_lib_generator import ClientLibGenerator
 from snet.sdk.mpe.mpe_contract import MPEContract
 from snet.sdk.mpe.payment_channel_provider import PaymentChannelProvider
-from snet.sdk.payment_strategies.default_payment_strategy import DefaultPaymentStrategy as PaymentStrategy
+from snet.sdk.payment_strategies.default_payment_strategy import *
 from snet.sdk.service_client import ServiceClient
 from snet.sdk.storage_provider.storage_provider import StorageProvider
 from snet.sdk.custom_typing import ModuleName, ServiceStub
-from snet.sdk.utils.utils import (bytes32_to_str, find_file_by_keyword,
-                                  type_converter)
+from snet.sdk.utils.utils import (
+    bytes32_to_str,
+    find_file_by_keyword,
+    type_converter
+)
 
 google.protobuf.internal.api_implementation.Type = lambda: 'python'
 _sym_db = _symbol_database.Default()
 _sym_db.RegisterMessage = lambda x: None
 
 
+class PaymentStrategyType(Enum):
+    PAID_CALL = PaidCallPaymentStrategy
+    FREE_CALL = FreeCallPaymentStrategy
+    PREPAID_CALL = PrePaidPaymentStrategy
+    DEFAULT = DefaultPaymentStrategy
+
+
 class SnetSDK:
     """Base Snet SDK"""
 
@@ -91,11 +102,9 @@ def __init__(self, sdk_config: Config, metadata_provider=None):
     def create_service_client(self,
                               org_id: str,
                               service_id: str,
-                              group_name=None,
-                              payment_strategy=None,
-                              free_call_auth_token_bin=None,
-                              free_call_token_expiry_block=None,
-                              email=None,
+                              group_name: str=None,
+                              payment_strategy: PaymentStrategy = None,
+                              payment_strategy_type: PaymentStrategyType=PaymentStrategyType.DEFAULT,
                               options=None,
                               concurrent_calls: int = 1):
 
@@ -120,22 +129,13 @@ def create_service_client(self,
                 print("Generating client library...")
                 self.lib_generator.generate_client_library()
 
-        if payment_strategy is None:
-            payment_strategy = PaymentStrategy(
-                concurrent_calls=concurrent_calls
-            )
-
         if options is None:
             options = dict()
-        options['free_call_auth_token-bin'] = (
-            bytes.fromhex(free_call_auth_token_bin) if
-            free_call_token_expiry_block else ""
-        )
-        options['free-call-token-expiry-block'] = (
-            free_call_token_expiry_block if free_call_token_expiry_block else 0
-        )
-        options['email'] = email if email else ""
         options['concurrency'] = self._sdk_config.get("concurrency", True)
+        options['concurrent_calls'] = concurrent_calls
+
+        if payment_strategy is None:
+            payment_strategy = payment_strategy_type.value()
 
         service_metadata = self._metadata_provider.enhance_service_metadata(
             org_id, service_id
@@ -146,7 +146,8 @@ def create_service_client(self,
 
         pb2_module = self.get_module_by_keyword(keyword="pb2.py")
         _service_client = ServiceClient(org_id, service_id, service_metadata,
-                                        group, service_stubs, payment_strategy,
+                                        group, service_stubs,
+                                        payment_strategy,
                                         options, self.mpe_contract,
                                         self.account, self.web3, pb2_module,
                                         self.payment_channel_provider,

snet/sdk/account.py

@@ -84,7 +84,7 @@ def _send_signed_transaction(self, contract_fn, *args):
         signed_txn = self.web3.eth.account.sign_transaction(
             transaction, private_key=self.private_key)
         return self.web3.to_hex(
-            self.web3.eth.send_raw_transaction(signed_txn.rawTransaction)
+            self.web3.eth.send_raw_transaction(signed_txn.raw_transaction)
         )
 
     def send_transaction(self, contract_fn, *args):

snet/sdk/concurrency_manager.py

@@ -3,12 +3,11 @@
 import grpc
 import web3
 
-from snet.sdk.service_client import ServiceClient
 from snet.sdk.utils.utils import RESOURCES_PATH, add_to_path
 
 
 class ConcurrencyManager:
-    def __init__(self, concurrent_calls: int):
+    def __init__(self, concurrent_calls: int=1):
         self.__concurrent_calls: int = concurrent_calls
         self.__token: str = ''
         self.__planned_amount: int = 0
@@ -18,14 +17,18 @@ def __init__(self, concurrent_calls: int):
     def concurrent_calls(self) -> int:
         return self.__concurrent_calls
 
+    @concurrent_calls.setter
+    def concurrent_calls(self, concurrent_calls: int):
+        self.__concurrent_calls = concurrent_calls
+
     def get_token(self, service_client, channel, service_call_price):
         if len(self.__token) == 0:
             self.__token = self.__get_token(service_client, channel, service_call_price)
         elif self.__used_amount >= self.__planned_amount:
             self.__token = self.__get_token(service_client, channel, service_call_price, new_token=True)
         return self.__token
 
-    def __get_token(self, service_client: ServiceClient, channel, service_call_price, new_token=False):
+    def __get_token(self, service_client, channel, service_call_price, new_token=False):
         if not new_token:
             amount = channel.state["last_signed_amount"]
             if amount != 0:
@@ -47,13 +50,13 @@ def __get_token(self, service_client: ServiceClient, channel, service_call_price
         self.__planned_amount = token_reply.planned_amount
         return token_reply.token
 
-    def __get_stub_for_get_token(self, service_client: ServiceClient):
+    def __get_stub_for_get_token(self, service_client):
         grpc_channel = service_client.get_grpc_base_channel()
         with add_to_path(str(RESOURCES_PATH.joinpath("proto"))):
             token_service_pb2_grpc = importlib.import_module("token_service_pb2_grpc")
         return token_service_pb2_grpc.TokenServiceStub(grpc_channel)
 
-    def __get_token_for_amount(self, service_client: ServiceClient, channel, amount):
+    def __get_token_for_amount(self, service_client, channel, amount):
         nonce = channel.state["nonce"]
         stub = self.__get_stub_for_get_token(service_client)
         with add_to_path(str(RESOURCES_PATH.joinpath("proto"))):