[FAB-6275] Add Default GO SDK config

Change-Id: I338a8a59e586321930dc8b62ff0175c573b44995
Signed-off-by: Baha Shaaban <baha.shaaban@securekey.com>

Author: Baha Shaaban

README.md

@@ -134,6 +134,17 @@ cd $GOPATH/src/github.com/hyperledger/fabric-sdk-go/test/integration/
 go test
 ```
 
+#### Using default config
+
+Default SDK Go configurations are found in the code under /pkg/config/config.yaml
+
+To override the default in non Dev environment, set the default path in the following environment variable:
+
+**FABRIC_SDK_CONFIG_PATH**=/path/to/default/config yaml(without specifying the yaml file name)
+
+This path value must be a directory. It must contain a default 'config.yaml' file.
+Note that this default config is used only if environment configuration yaml file is missing to ensure all environment variables are created regardless of their values.
+
 #### Testing with Local Build of Fabric (Advanced)
 
 Alternatively you can build and run Fabric on your own box using the following commands:

pkg/config/config.go

@@ -18,6 +18,8 @@ import (
 	"strings"
 	"time"
 
+	"path/filepath"
+
 	"github.com/hyperledger/fabric-sdk-go/api/apiconfig"
 	bccspFactory "github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/bccsp/factory"
 	"github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/bccsp/pkcs11"
@@ -56,6 +58,10 @@ func InitConfigWithCmdRoot(configFile string, cmdRootPrefix string) (*Config, er
 	myViper.AutomaticEnv()
 	replacer := strings.NewReplacer(".", "_")
 	myViper.SetEnvKeyReplacer(replacer)
+	err := loadDefaultConfig()
+	if err != nil {
+		return nil, err
+	}
 	if configFile != "" {
 		// create new viper
 		myViper.SetConfigFile(configFile)
@@ -85,6 +91,23 @@ func InitConfigWithCmdRoot(configFile string, cmdRootPrefix string) (*Config, er
 	return &Config{tlsCertPool: x509.NewCertPool()}, nil
 }
 
+// load Default confid
+func loadDefaultConfig() error {
+	// get Environment Default Config Path
+	defaultPath := os.Getenv("FABRIC_SDK_CONFIG_PATH")
+	if defaultPath != "" { // if set, use it to load default config
+		myViper.AddConfigPath(strings.Replace(defaultPath, "$GOPATH", os.Getenv("GOPATH"), -1))
+	} else { // else fallback to default DEV path
+		devPath := filepath.Join(os.Getenv("GOPATH"), "src", "github.com", "hyperledger", "fabric-sdk-go", "pkg", "config")
+		myViper.AddConfigPath(devPath)
+	}
+	err := myViper.ReadInConfig() // Find and read the config file
+	if err != nil {               // Handle errors reading the config file
+		return fmt.Errorf("fatal error config file: %s", err)
+	}
+	return nil
+}
+
 // Client returns the Client config
 func (c *Config) Client() (*apiconfig.ClientConfig, error) {
 	config, err := c.NetworkConfig()

pkg/config/config.yaml

@@ -0,0 +1,239 @@
+#
+# Copyright SecureKey Technologies Inc. All Rights Reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+#
+# Default GO SDK Configuration
+#
+# The network connection profile provides client applications the information about the target
+# blockchain network that are necessary for the applications to interact with it. These are all
+# knowledge that must be acquired from out-of-band sources. This file provides such a source.
+#
+name: "default-network"
+
+#
+# Any properties with an "x-" prefix will be treated as application-specific, exactly like how naming
+# in HTTP headers or swagger properties work. The SDK will simply ignore these fields and leave
+# them for the applications to process. This is a mechanism for different components of an application
+# to exchange information that are not part of the standard schema described below. In particular,
+# the "x-type" property with the "hlfv1" value example below is used by Hyperledger Composer to
+# determine the type of Fabric networks (v0.6 vs. v1.0) it needs to work with.
+#
+x-type: "hlfv1"
+x-loggingLevel: info
+
+#
+# Describe what the target network is/does.
+#
+description: "The network description"
+
+#
+# Schema version of the content. Used by the SDK to apply the corresponding parsing rules.
+#
+version: 1.0.0
+
+#
+# The client section used by GO SDK.
+#
+client:
+  # Which organization does this application instance belong to? The value must be the name of an org
+  # defined under "organizations"
+  organization: match_value_with_one_of_organizations
+
+  logging:
+    level: info
+
+  # set connection timeouts for the peer and orderer for the client
+  connection:
+     timeout:
+      peer:
+       endorser: 3s
+       eventHub: 3s
+       eventReg: 3s
+      orderer: 3s
+
+  # Needed to load users crypto keys and certs.
+  cryptoconfig:
+    path: path/to/cryptoconfig
+
+  # enable/disable tls for the client
+  tls:
+    enabled: true
+
+  # Some SDKs support pluggable KV stores, the properties under "credentialStore"
+  # are implementation specific
+  credentialStore:
+    # [Optional]. Not used by Go SDK. Others SDKs may use it if using an alternative impl
+    # Could be used if SDK would require an object for properties like url, db name, etc.
+    path: unused/by/sdk/go
+
+    # [Optional]. Specific to the CryptoSuite implementation used by GO SDK. Software-based implementations
+    # requiring a key store. PKCS#11 based implementations does not.
+    cryptoStore:
+      # Specific to the underlying KeyValueStore that backs the crypto key store.
+      path: /usually/it/is/tmp/msp
+
+    # [Optional]. Specific to Composer environment. Not used by SDK Go.
+    wallet: wallet-name-unused-by-sdk-go
+
+   # BCCSP config for the client. Used by GO SDK.
+  BCCSP:
+    security:
+     enabled: true
+     default:
+      # provider: "SW"
+      provider: ""
+     # hashAlgorithm: "SHA2"
+     hashAlgorithm: ""
+     softVerify: true
+     ephemeral: false
+     level: 256
+     pin: "somepin"
+     label: "ForFabric"
+     #library: "/usr/lib/x86_64-linux-gnu/softhsm/libsofthsm2.so, /usr/lib/softhsm/libsofthsm2.so ,/usr/lib/s390x-linux-gnu/softhsm/libsofthsm2.so, /usr/lib/powerpc64le-linux-gnu/softhsm/libsofthsm2.so, /usr/local/Cellar/softhsm/2.1.0/lib/softhsm/libsofthsm2.so"
+     library: "add BCCSP library here"
+
+#
+# [Optional]. But most apps would have this section so that channel objects can be constructed
+# based on the content below. If an app is creating channels, then it likely will not need this
+# section.
+#
+channels:
+  # name of the channel
+#  mychannel:
+    # Required. list of orderers designated by the application to use for transactions on this
+    # channel. This list can be a result of access control ("org1" can only access "ordererA"), or
+    # operational decisions to share loads from applications among the orderers.  The values must
+    # be "names" of orgs defined under "organizations/peers"
+#    orderers:
+#      - orderer.example.com
+
+    # Required. list of peers from participating orgs
+#    peers:
+#      peer0.org1.example.com:
+        # [Optional]. will this peer be sent transaction proposals for endorsement? The peer must
+        # have the chaincode installed. The app can also use this property to decide which peers
+        # to send the chaincode install request. Default: true
+#        endorsingPeer: true
+
+        # [Optional]. will this peer be sent query proposals? The peer must have the chaincode
+        # installed. The app can also use this property to decide which peers to send the
+        # chaincode install request. Default: true
+#        chaincodeQuery: true
+
+        # [Optional]. will this peer be sent query proposals that do not require chaincodes, like
+        # queryBlock(), queryTransaction(), etc. Default: true
+#        ledgerQuery: true
+
+        # [Optional]. will this peer be the target of the SDK's listener registration? All peers can
+        # produce events but the app typically only needs to connect to one to listen to events.
+        # Default: true
+#        eventSource: true
+
+
+    # [Optional]. what chaincodes are expected to exist on this channel? The application can use
+    # this information to validate that the target peers are in the expected state by comparing
+    # this list with the query results of getInstalledChaincodes() and getInstantiatedChaincodes()
+#    chaincodes:
+      # the format follows the "canonical name" of chaincodes by fabric code
+#      - example02:v1
+#      - marbles:1.0
+
+#
+# list of participating organizations in this network
+#
+organizations:
+#  org1:
+#    mspid: Org1MSP
+
+#    peers:
+#      - peer0.org1.example.com
+
+    # [Optional]. Certificate Authorities issue certificates for identification purposes in a Fabric based
+    # network. Typically certificates provisioning is done in a separate process outside of the
+    # runtime network. Fabric-CA is a special certificate authority that provides a REST APIs for
+    # dynamic certificate management (enroll, revoke, re-enroll). The following section is only for
+    # Fabric-CA servers.
+#    certificateAuthorities:
+#      - ca-org1
+
+    # [Optional]. If the application is going to make requests that are reserved to organization
+    # administrators, including creating/updating channels, installing/instantiating chaincodes, it
+    # must have access to the admin identity represented by the private key and signing certificate.
+    # Both properties can be the PEM string or local path to the PEM file. Note that this is mainly for
+    # convenience in development mode, production systems should not expose sensitive information
+    # this way. The SDK should allow applications to set the org admin identity via APIs, and only use
+    # this route as an alternative when it exists.
+#    adminPrivateKey:
+#      pem: "-----BEGIN PRIVATE KEY----- <etc>"
+#    signedCert:
+#      path: "/tmp/somepath/signed-cert.pem"
+
+
+#
+# List of orderers to send transaction and channel create/update requests to. For the time
+# being only one orderer is needed. If more than one is defined, which one get used by the
+# SDK is implementation specific. Consult each SDK's documentation for its handling of orderers.
+#
+orderers:
+#  orderer.example.com:
+#    url: orderer.example.com:7050
+
+    # these are standard properties defined by the gRPC library
+    # they will be passed in as-is to gRPC client constructor
+#    grpcOptions:
+#      ssl-target-name-override: orderer.example.com
+#      grpc-max-send-message-length: 15
+
+#    tlsCACerts:
+      # Certificate location absolute path
+#      path: $GOPATH/src/github.com/hyperledger/fabric-sdk-go/test/fixtures/channel/crypto-config/ordererOrganizations/example.com/tlsca/tlsca.example.com-cert.pem
+
+#
+# List of peers to send various requests to, including endorsement, query
+# and event listener registration.
+#
+peers:
+#  peer0.org1.example.com:
+    # this URL is used to send endorsement and query requests
+#    url: peer0.org1.example.com:7051
+
+    # this URL is used to connect the EventHub and registering event listeners
+#    eventUrl: peer0.org1.example.com:7053
+
+#    grpcOptions:
+#      ssl-target-name-override: peer0.org1.example.com
+#      grpc.http2.keepalive_time: 15
+
+#    tlsCACerts:
+      # Certificate location absolute path
+#      path: path/to/tls/cert/for/peer0/org1
+
+#
+# Fabric-CA is a special kind of Certificate Authority provided by Hyperledger Fabric which allows
+# certificate management to be done via REST APIs. Application may choose to use a standard
+# Certificate Authority instead of Fabric-CA, in which case this section would not be specified.
+#
+certificateAuthorities:
+#  ca-org1:
+#    url: https://ca_peerOrg1:7054
+    # the properties specified under this object are passed to the 'http' client verbatim when
+    # making the request to the Fabric-CA server
+#    httpOptions:
+#      verify: true
+#    tlsCACerts:
+      # Comma-Separated list of paths
+#      path: path/to/tls/cert/for/ca-org1
+      # Client key and cert for SSL handshake with Fabric CA
+#      client:
+#       keyfile: path/to/client_fabric_client-key.pem
+#       certfile: path/to/client_fabric_client.pem
+
+    # Fabric-CA supports dynamic user enrollment via REST APIs. A "root" user, a.k.a registrar, is
+    # needed to enroll and invoke new users.
+#    registrar:
+#      enrollId: usualy-it-is_admin
+#      enrollSecret: adminpasswd
+    # [Optional] The optional name of the CA.
+#    caName: ca-org1