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vendor: remove github.com/hashicorp/scada-client

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Frank Schroeder 2017-05-22 06:29:27 +02:00 committed by Frank Schröder
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363
vendor/github.com/hashicorp/scada-client/LICENSE generated vendored
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@ -1,363 +0,0 @@
Mozilla Public License, version 2.0
1. Definitions
1.1. "Contributor"
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. "Incompatible With Secondary Licenses"
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the terms of
a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in a
separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible, whether
at the time of the initial grant or subsequently, any and all of the
rights conveyed by this License.
1.10. "Modifications"
means any of the following:
a. any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the License,
by the making, using, selling, offering for sale, having made, import,
or transfer of either its Contributions or its Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, "control" means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights to
grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter the
recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty, or
limitations of liability) contained within the Source Code Form of the
Covered Software, except that You may alter any license notices to the
extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute,
judicial order, or regulation then You must: (a) comply with the terms of
this License to the maximum extent possible; and (b) describe the
limitations and the code they affect. Such description must be placed in a
text file included with all distributions of the Covered Software under
this License. Except to the extent prohibited by statute or regulation,
such description must be sufficiently detailed for a recipient of ordinary
skill to be able to understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing
basis, if such Contributor fails to notify You of the non-compliance by
some reasonable means prior to 60 days after You have come back into
compliance. Moreover, Your grants from a particular Contributor are
reinstated on an ongoing basis if such Contributor notifies You of the
non-compliance by some reasonable means, this is the first time You have
received notice of non-compliance with this License from such
Contributor, and You become compliant prior to 30 days after Your receipt
of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an "as is" basis,
without warranty of any kind, either expressed, implied, or statutory,
including, without limitation, warranties that the Covered Software is free
of defects, merchantable, fit for a particular purpose or non-infringing.
The entire risk as to the quality and performance of the Covered Software
is with You. Should any Covered Software prove defective in any respect,
You (not any Contributor) assume the cost of any necessary servicing,
repair, or correction. This disclaimer of warranty constitutes an essential
part of this License. No use of any Covered Software is authorized under
this License except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from
such party's negligence to the extent applicable law prohibits such
limitation. Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages, so this exclusion and limitation may
not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts
of a jurisdiction where the defendant maintains its principal place of
business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions. Nothing
in this Section shall prevent a party's ability to bring cross-claims or
counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides that
the language of a contract shall be construed against the drafter shall not
be used to construe this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses If You choose to distribute Source Code Form that is
Incompatible With Secondary Licenses under the terms of this version of
the License, the notice described in Exhibit B of this License must be
attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file,
then You may include the notice in a location (such as a LICENSE file in a
relevant directory) where a recipient would be likely to look for such a
notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
This Source Code Form is "Incompatible
With Secondary Licenses", as defined by
the Mozilla Public License, v. 2.0.

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# SCADA Client
This library provides a Golang client for the [HashiCorp SCADA service](http://scada.hashicorp.com).
SCADA stands for Supervisory Control And Data Acquisition, and as the name implies it allows
[Atlas](https://atlas.hashicorp.com) to provide control functions and request data from the tools that integrate.
The technical details about how SCADA works are fairly simple. Clients first open a connection to
the SCADA service at scada.hashicorp.com on port 7223. This connection is secured by TLS, allowing
clients to verify the identity of the servers and to encrypt all communications. Once connected, a
handshake is performed where a client provides it's Atlas API credentials so that Atlas can verify
the client identity. Once complete, clients keep the connection open in an idle state waiting for
commands to be received. Commands map to APIs exposed by the product, and are subject to any ACLs,
authentication or authorization mechanisms of the client.
This library is used in various HashiCorp products to integrate with the SCADA system.
## Environmental Variables
This library respects the following environment variables:
* ATLAS_TOKEN: The Atlas token to use for authentication
* SCADA_ENDPOINT: Overrides the default SCADA endpoint

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vendor/github.com/hashicorp/scada-client/client.go generated vendored
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package client
import (
"crypto/tls"
"fmt"
"io"
"net"
"sync"
"time"
"github.com/hashicorp/net-rpc-msgpackrpc"
"github.com/hashicorp/yamux"
)
const (
// clientPreamble is the preamble to send before upgrading
// the connection into a SCADA version 1 connection.
clientPreamble = "SCADA 1\n"
// rpcTimeout is how long of a read deadline we provide
rpcTimeout = 10 * time.Second
)
// Opts is used to parameterize a Dial
type Opts struct {
// Addr is the dial address
Addr string
// TLS controls if TLS is used
TLS bool
// TLSConfig or nil for default
TLSConfig *tls.Config
// Modifies the log output
LogOutput io.Writer
}
// Client is a SCADA compatible client. This is a bare bones client that
// only handles the framing and RPC protocol. Higher-level clients should
// be prefered.
type Client struct {
conn net.Conn
client *yamux.Session
closed bool
closedLock sync.Mutex
}
// Dial is used to establish a new connection over TCP
func Dial(addr string) (*Client, error) {
opts := Opts{Addr: addr, TLS: false}
return DialOpts(&opts)
}
// DialTLS is used to establish a new connection using TLS/TCP
func DialTLS(addr string, tlsConf *tls.Config) (*Client, error) {
opts := Opts{Addr: addr, TLS: true, TLSConfig: tlsConf}
return DialOpts(&opts)
}
// DialOpts is a parameterized Dial
func DialOpts(opts *Opts) (*Client, error) {
var conn net.Conn
var err error
if opts.TLS {
conn, err = tls.Dial("tcp", opts.Addr, opts.TLSConfig)
} else {
conn, err = net.DialTimeout("tcp", opts.Addr, 10*time.Second)
}
if err != nil {
return nil, err
}
return initClient(conn, opts)
}
// initClient does the common initialization
func initClient(conn net.Conn, opts *Opts) (*Client, error) {
// Send the preamble
_, err := conn.Write([]byte(clientPreamble))
if err != nil {
return nil, fmt.Errorf("preamble write failed: %v", err)
}
// Wrap the connection in yamux for multiplexing
ymConf := yamux.DefaultConfig()
if opts.LogOutput != nil {
ymConf.LogOutput = opts.LogOutput
}
client, _ := yamux.Client(conn, ymConf)
// Create the client
c := &Client{
conn: conn,
client: client,
}
return c, nil
}
// Close is used to terminate the client connection
func (c *Client) Close() error {
c.closedLock.Lock()
defer c.closedLock.Unlock()
if c.closed {
return nil
}
c.closed = true
c.client.GoAway() // Notify the other side of the close
return c.client.Close()
}
// RPC is used to perform an RPC
func (c *Client) RPC(method string, args interface{}, resp interface{}) error {
// Get a stream
stream, err := c.Open()
if err != nil {
return fmt.Errorf("failed to open stream: %v", err)
}
defer stream.Close()
stream.SetDeadline(time.Now().Add(rpcTimeout))
// Create the RPC client
cc := msgpackrpc.NewCodec(true, true, stream)
return msgpackrpc.CallWithCodec(cc, method, args, resp)
}
// Accept is used to accept an incoming connection
func (c *Client) Accept() (net.Conn, error) {
return c.client.Accept()
}
// Open is used to open an outgoing connection
func (c *Client) Open() (net.Conn, error) {
return c.client.Open()
}
// Addr is so that client can act like a net.Listener
func (c *Client) Addr() net.Addr {
return c.client.LocalAddr()
}
// NumStreams returns the number of open streams on the client
func (c *Client) NumStreams() int {
return c.client.NumStreams()
}

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vendor/github.com/hashicorp/scada-client/provider.go generated vendored
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package client
import (
"crypto/tls"
"fmt"
"io"
"log"
"math/rand"
"net"
"net/rpc"
"os"
"strings"
"sync"
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/net-rpc-msgpackrpc"
)
const (
// DefaultEndpoint is the endpoint used if none is provided
DefaultEndpoint = "scada.hashicorp.com:7223"
// DefaultBackoff is the amount of time we back off if we encounter
// and error, and no specific backoff is available.
DefaultBackoff = 120 * time.Second
// DisconnectDelay is how long we delay the disconnect to allow
// the RPC to complete.
DisconnectDelay = time.Second
)
// CapabilityProvider is used to provide a given capability
// when requested remotely. They must return a connection
// that is bridged or an error.
type CapabilityProvider func(capability string, meta map[string]string, conn io.ReadWriteCloser) error
// ProviderService is the service being exposed
type ProviderService struct {
Service string
ServiceVersion string
Capabilities map[string]int
Meta map[string]string
ResourceType string
}
// ProviderConfig is used to parameterize a provider
type ProviderConfig struct {
// Endpoint is the SCADA endpoint, defaults to DefaultEndpoint
Endpoint string
// Service is the service to expose
Service *ProviderService
// Handlers are invoked to provide the named capability
Handlers map[string]CapabilityProvider
// ResourceGroup is the named group e.g. "hashicorp/prod"
ResourceGroup string
// Token is the Atlas authentication token
Token string
// Optional TLS configuration, defaults used otherwise
TLSConfig *tls.Config
// LogOutput is to control the log output
LogOutput io.Writer
}
// Provider is a high-level interface to SCADA by which
// clients declare themselves as a service providing capabilities.
// Provider manages the client/server interactions required,
// making it simpler to integrate.
type Provider struct {
config *ProviderConfig
logger *log.Logger
client *Client
clientLock sync.Mutex
noRetry bool // set when the server instructs us to not retry
backoff time.Duration // set when the server provides a longer backoff
backoffLock sync.Mutex
sessionID string
sessionAuth bool
sessionLock sync.RWMutex
shutdown bool
shutdownCh chan struct{}
shutdownLock sync.Mutex
}
// validateConfig is used to sanity check the configuration
func validateConfig(config *ProviderConfig) error {
// Validate the inputs
if config == nil {
return fmt.Errorf("missing config")
}
if config.Service == nil {
return fmt.Errorf("missing service")
}
if config.Service.Service == "" {
return fmt.Errorf("missing service name")
}
if config.Service.ServiceVersion == "" {
return fmt.Errorf("missing service version")
}
if config.Service.ResourceType == "" {
return fmt.Errorf("missing service resource type")
}
if config.Handlers == nil && len(config.Service.Capabilities) != 0 {
return fmt.Errorf("missing handlers")
}
for c := range config.Service.Capabilities {
if _, ok := config.Handlers[c]; !ok {
return fmt.Errorf("missing handler for '%s' capability", c)
}
}
if config.ResourceGroup == "" {
return fmt.Errorf("missing resource group")
}
if config.Token == "" {
config.Token = os.Getenv("ATLAS_TOKEN")
}
if config.Token == "" {
return fmt.Errorf("missing token")
}
// Default the endpoint
if config.Endpoint == "" {
config.Endpoint = DefaultEndpoint
if end := os.Getenv("SCADA_ENDPOINT"); end != "" {
config.Endpoint = end
}
}
return nil
}
// NewProvider is used to create a new provider
func NewProvider(config *ProviderConfig) (*Provider, error) {
if err := validateConfig(config); err != nil {
return nil, err
}
// Create logger
if config.LogOutput == nil {
config.LogOutput = os.Stderr
}
logger := log.New(config.LogOutput, "", log.LstdFlags)
p := &Provider{
config: config,
logger: logger,
shutdownCh: make(chan struct{}),
}
go p.run()
return p, nil
}
// Shutdown is used to close the provider
func (p *Provider) Shutdown() {
p.shutdownLock.Lock()
p.shutdownLock.Unlock()
if p.shutdown {
return
}
p.shutdown = true
close(p.shutdownCh)
}
// IsShutdown checks if we have been shutdown
func (p *Provider) IsShutdown() bool {
select {
case <-p.shutdownCh:
return true
default:
return false
}
}
// backoffDuration is used to compute the next backoff duration
func (p *Provider) backoffDuration() time.Duration {
// Use the default backoff
backoff := DefaultBackoff
// Check for a server specified backoff
p.backoffLock.Lock()
if p.backoff != 0 {
backoff = p.backoff
}
if p.noRetry {
backoff = 0
}
p.backoffLock.Unlock()
return backoff
}
// wait is used to delay dialing on an error
func (p *Provider) wait() {
// Compute the backoff time
backoff := p.backoffDuration()
// Setup a wait timer
var wait <-chan time.Time
if backoff > 0 {
jitter := time.Duration(rand.Uint32()) % backoff
wait = time.After(backoff + jitter)
}
// Wait until timer or shutdown
select {
case <-wait:
case <-p.shutdownCh:
}
}
// run is a long running routine to manage the provider
func (p *Provider) run() {
for !p.IsShutdown() {
// Setup a new connection
client, err := p.clientSetup()
if err != nil {
p.wait()
continue
}
// Handle the session
doneCh := make(chan struct{})
go p.handleSession(client, doneCh)
// Wait for session termination or shutdown
select {
case <-doneCh:
p.wait()
case <-p.shutdownCh:
p.clientLock.Lock()
client.Close()
p.clientLock.Unlock()
return
}
}
}
// handleSession is used to handle an established session
func (p *Provider) handleSession(list net.Listener, doneCh chan struct{}) {
defer close(doneCh)
defer list.Close()
// Accept new connections
for !p.IsShutdown() {
conn, err := list.Accept()
if err != nil {
p.logger.Printf("[ERR] scada-client: failed to accept connection: %v", err)
return
}
p.logger.Printf("[DEBUG] scada-client: accepted connection")
go p.handleConnection(conn)
}
}
// handleConnection handles an incoming connection
func (p *Provider) handleConnection(conn net.Conn) {
// Create an RPC server to handle inbound
pe := &providerEndpoint{p: p}
rpcServer := rpc.NewServer()
rpcServer.RegisterName("Client", pe)
rpcCodec := msgpackrpc.NewCodec(false, false, conn)
defer func() {
if !pe.hijacked() {
conn.Close()
}
}()
for !p.IsShutdown() {
if err := rpcServer.ServeRequest(rpcCodec); err != nil {
if err != io.EOF && !strings.Contains(err.Error(), "closed") {
p.logger.Printf("[ERR] scada-client: RPC error: %v", err)
}
return
}
// Handle potential hijack in Client.Connect
if pe.hijacked() {
cb := pe.getHijack()
cb(conn)
return
}
}
}
// clientSetup is used to setup a new connection
func (p *Provider) clientSetup() (*Client, error) {
defer metrics.MeasureSince([]string{"scada", "setup"}, time.Now())
// Reset the previous backoff
p.backoffLock.Lock()
p.noRetry = false
p.backoff = 0
p.backoffLock.Unlock()
// Dial a new connection
opts := Opts{
Addr: p.config.Endpoint,
TLS: true,
TLSConfig: p.config.TLSConfig,
LogOutput: p.config.LogOutput,
}
client, err := DialOpts(&opts)
if err != nil {
p.logger.Printf("[ERR] scada-client: failed to dial: %v", err)
return nil, err
}
// Perform a handshake
resp, err := p.handshake(client)
if err != nil {
p.logger.Printf("[ERR] scada-client: failed to handshake: %v", err)
client.Close()
return nil, err
}
if resp != nil && resp.SessionID != "" {
p.logger.Printf("[DEBUG] scada-client: assigned session '%s'", resp.SessionID)
}
if resp != nil && !resp.Authenticated {
p.logger.Printf("[WARN] scada-client: authentication failed: %v", resp.Reason)
}
// Set the new client
p.clientLock.Lock()
if p.client != nil {
p.client.Close()
}
p.client = client
p.clientLock.Unlock()
p.sessionLock.Lock()
p.sessionID = resp.SessionID
p.sessionAuth = resp.Authenticated
p.sessionLock.Unlock()
return client, nil
}
// SessionID provides the current session ID
func (p *Provider) SessionID() string {
p.sessionLock.RLock()
defer p.sessionLock.RUnlock()
return p.sessionID
}
// SessionAuth checks if the current session is authenticated
func (p *Provider) SessionAuthenticated() bool {
p.sessionLock.RLock()
defer p.sessionLock.RUnlock()
return p.sessionAuth
}
// handshake does the initial handshake
func (p *Provider) handshake(client *Client) (*HandshakeResponse, error) {
defer metrics.MeasureSince([]string{"scada", "handshake"}, time.Now())
req := HandshakeRequest{
Service: p.config.Service.Service,
ServiceVersion: p.config.Service.ServiceVersion,
Capabilities: p.config.Service.Capabilities,
Meta: p.config.Service.Meta,
ResourceType: p.config.Service.ResourceType,
ResourceGroup: p.config.ResourceGroup,
Token: p.config.Token,
}
resp := new(HandshakeResponse)
if err := client.RPC("Session.Handshake", &req, resp); err != nil {
return nil, err
}
return resp, nil
}
type HijackFunc func(io.ReadWriteCloser)
// providerEndpoint is used to implement the Client.* RPC endpoints
// as part of the provider.
type providerEndpoint struct {
p *Provider
hijack HijackFunc
}
// Hijacked is used to check if the connection has been hijacked
func (pe *providerEndpoint) hijacked() bool {
return pe.hijack != nil
}
// GetHijack returns the hijack function
func (pe *providerEndpoint) getHijack() HijackFunc {
return pe.hijack
}
// Hijack is used to take over the yamux stream for Client.Connect
func (pe *providerEndpoint) setHijack(cb HijackFunc) {
pe.hijack = cb
}
// Connect is invoked by the broker to connect to a capability
func (pe *providerEndpoint) Connect(args *ConnectRequest, resp *ConnectResponse) error {
defer metrics.IncrCounter([]string{"scada", "connect", args.Capability}, 1)
pe.p.logger.Printf("[INFO] scada-client: connect requested (capability: %s)",
args.Capability)
// Handle potential flash
if args.Severity != "" && args.Message != "" {
pe.p.logger.Printf("[%s] scada-client: %s", args.Severity, args.Message)
}
// Look for the handler
handler := pe.p.config.Handlers[args.Capability]
if handler == nil {
pe.p.logger.Printf("[WARN] scada-client: requested capability '%s' not available",
args.Capability)
return fmt.Errorf("invalid capability")
}
// Hijack the connection
pe.setHijack(func(a io.ReadWriteCloser) {
if err := handler(args.Capability, args.Meta, a); err != nil {
pe.p.logger.Printf("[ERR] scada-client: '%s' handler error: %v",
args.Capability, err)
}
})
resp.Success = true
return nil
}
// Disconnect is invoked by the broker to ask us to backoff
func (pe *providerEndpoint) Disconnect(args *DisconnectRequest, resp *DisconnectResponse) error {
defer metrics.IncrCounter([]string{"scada", "disconnect"}, 1)
if args.Reason == "" {
args.Reason = "<no reason provided>"
}
pe.p.logger.Printf("[INFO] scada-client: disconnect requested (retry: %v, backoff: %v): %v",
!args.NoRetry, args.Backoff, args.Reason)
// Use the backoff information
pe.p.backoffLock.Lock()
pe.p.noRetry = args.NoRetry
pe.p.backoff = args.Backoff
pe.p.backoffLock.Unlock()
// Clear the session information
pe.p.sessionLock.Lock()
pe.p.sessionID = ""
pe.p.sessionAuth = false
pe.p.sessionLock.Unlock()
// Force the disconnect
time.AfterFunc(DisconnectDelay, func() {
pe.p.clientLock.Lock()
if pe.p.client != nil {
pe.p.client.Close()
}
pe.p.clientLock.Unlock()
})
return nil
}
// Flash is invoked by the broker log a message
func (pe *providerEndpoint) Flash(args *FlashRequest, resp *FlashResponse) error {
defer metrics.IncrCounter([]string{"scada", "flash"}, 1)
if args.Severity != "" && args.Message != "" {
pe.p.logger.Printf("[%s] scada-client: %s", args.Severity, args.Message)
}
return nil
}

49
vendor/github.com/hashicorp/scada-client/structs.go generated vendored
View file

@ -1,49 +0,0 @@
package client
import "time"
// HandshakeRequest is used to authenticate the session
type HandshakeRequest struct {
Service string
ServiceVersion string
Capabilities map[string]int
Meta map[string]string
ResourceType string
ResourceGroup string
Token string
}
type HandshakeResponse struct {
Authenticated bool
SessionID string
Reason string
}
type ConnectRequest struct {
Capability string
Meta map[string]string
Severity string
Message string
}
type ConnectResponse struct {
Success bool
}
type DisconnectRequest struct {
NoRetry bool // Should the client retry
Backoff time.Duration // Minimum backoff
Reason string
}
type DisconnectResponse struct {
}
type FlashRequest struct {
Severity string
Message string
}
type FlashResponse struct {
}

6
vendor/vendor.json vendored
View file

@ -625,12 +625,6 @@
"revision": "d1e82c1ec3f15ee991f7cc7ffd5b67ff6f5bbaee", "revision": "d1e82c1ec3f15ee991f7cc7ffd5b67ff6f5bbaee",
"revisionTime": "2015-02-01T20:08:39Z" "revisionTime": "2015-02-01T20:08:39Z"
}, },
{
"checksumSHA1": "u9qHbpIgMZ7/fjO0gFfds2m/1ck=",
"path": "github.com/hashicorp/scada-client",
"revision": "6e896784f66f82cdc6f17e00052db91699dc277d",
"revisionTime": "2016-06-01T22:40:23Z"
},
{ {
"checksumSHA1": "E3Xcanc9ouQwL+CZGOUyA/+giLg=", "checksumSHA1": "E3Xcanc9ouQwL+CZGOUyA/+giLg=",
"comment": "v0.7.0-66-g6c4672d", "comment": "v0.7.0-66-g6c4672d",