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api.go
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package api
import (
"bytes"
"compress/gzip"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"os"
"strconv"
"strings"
"time"
"github.com/gorilla/websocket"
cleanhttp "github.com/hashicorp/go-cleanhttp"
rootcerts "github.com/hashicorp/go-rootcerts"
)
var (
// ClientConnTimeout is the timeout applied when attempting to contact a
// client directly before switching to a connection through the Nomad
// server.
ClientConnTimeout = 1 * time.Second
)
// QueryOptions are used to parametrize a query
type QueryOptions struct {
// Providing a datacenter overwrites the region provided
// by the Config
Region string
// Namespace is the target namespace for the query.
Namespace string
// AllowStale allows any Nomad server (non-leader) to service
// a read. This allows for lower latency and higher throughput
AllowStale bool
// WaitIndex is used to enable a blocking query. Waits
// until the timeout or the next index is reached
WaitIndex uint64
// WaitTime is used to bound the duration of a wait.
// Defaults to that of the Config, but can be overridden.
WaitTime time.Duration
// If set, used as prefix for resource list searches
Prefix string
// Set HTTP parameters on the query.
Params map[string]string
// AuthToken is the secret ID of an ACL token
AuthToken string
}
// WriteOptions are used to parametrize a write
type WriteOptions struct {
// Providing a datacenter overwrites the region provided
// by the Config
Region string
// Namespace is the target namespace for the write.
Namespace string
// AuthToken is the secret ID of an ACL token
AuthToken string
}
// QueryMeta is used to return meta data about a query
type QueryMeta struct {
// LastIndex. This can be used as a WaitIndex to perform
// a blocking query
LastIndex uint64
// Time of last contact from the leader for the
// server servicing the request
LastContact time.Duration
// Is there a known leader
KnownLeader bool
// How long did the request take
RequestTime time.Duration
}
// WriteMeta is used to return meta data about a write
type WriteMeta struct {
// LastIndex. This can be used as a WaitIndex to perform
// a blocking query
LastIndex uint64
// How long did the request take
RequestTime time.Duration
}
// HttpBasicAuth is used to authenticate http client with HTTP Basic Authentication
type HttpBasicAuth struct {
// Username to use for HTTP Basic Authentication
Username string
// Password to use for HTTP Basic Authentication
Password string
}
// Config is used to configure the creation of a client
type Config struct {
// Address is the address of the Nomad agent
Address string
// Region to use. If not provided, the default agent region is used.
Region string
// SecretID to use. This can be overwritten per request.
SecretID string
// Namespace to use. If not provided the default namespace is used.
Namespace string
// HttpClient is the client to use. Default will be used if not provided.
//
// If set, it expected to be configured for tls already, and TLSConfig is ignored.
// You may use ConfigureTLS() function to aid with initialization.
HttpClient *http.Client
// HttpAuth is the auth info to use for http access.
HttpAuth *HttpBasicAuth
// WaitTime limits how long a Watch will block. If not provided,
// the agent default values will be used.
WaitTime time.Duration
// TLSConfig provides the various TLS related configurations for the http
// client.
//
// TLSConfig is ignored if HttpClient is set.
TLSConfig *TLSConfig
}
// ClientConfig copies the configuration with a new client address, region, and
// whether the client has TLS enabled.
func (c *Config) ClientConfig(region, address string, tlsEnabled bool) *Config {
scheme := "http"
if tlsEnabled {
scheme = "https"
}
config := &Config{
Address: fmt.Sprintf("%s://%s", scheme, address),
Region: region,
Namespace: c.Namespace,
HttpClient: c.HttpClient,
SecretID: c.SecretID,
HttpAuth: c.HttpAuth,
WaitTime: c.WaitTime,
TLSConfig: c.TLSConfig.Copy(),
}
// Update the tls server name for connecting to a client
if tlsEnabled && config.TLSConfig != nil {
config.TLSConfig.TLSServerName = fmt.Sprintf("client.%s.nomad", region)
}
return config
}
// TLSConfig contains the parameters needed to configure TLS on the HTTP client
// used to communicate with Nomad.
type TLSConfig struct {
// CACert is the path to a PEM-encoded CA cert file to use to verify the
// Nomad server SSL certificate.
CACert string
// CAPath is the path to a directory of PEM-encoded CA cert files to verify
// the Nomad server SSL certificate.
CAPath string
// CACertPem is the PEM-encoded CA cert to use to verify the Nomad server
// SSL certificate.
CACertPEM []byte
// ClientCert is the path to the certificate for Nomad communication
ClientCert string
// ClientCertPEM is the PEM-encoded certificate for Nomad communication
ClientCertPEM []byte
// ClientKey is the path to the private key for Nomad communication
ClientKey string
// ClientKeyPEM is the PEM-encoded private key for Nomad communication
ClientKeyPEM []byte
// TLSServerName, if set, is used to set the SNI host when connecting via
// TLS.
TLSServerName string
// Insecure enables or disables SSL verification
Insecure bool
}
func (t *TLSConfig) Copy() *TLSConfig {
if t == nil {
return nil
}
nt := new(TLSConfig)
*nt = *t
return nt
}
func defaultHttpClient() *http.Client {
httpClient := cleanhttp.DefaultClient()
transport := httpClient.Transport.(*http.Transport)
transport.TLSHandshakeTimeout = 10 * time.Second
transport.TLSClientConfig = &tls.Config{
MinVersion: tls.VersionTLS12,
}
return httpClient
}
// DefaultConfig returns a default configuration for the client
func DefaultConfig() *Config {
config := &Config{
Address: "http://127.0.0.1:4646",
TLSConfig: &TLSConfig{},
}
if addr := os.Getenv("NOMAD_ADDR"); addr != "" {
config.Address = addr
}
if v := os.Getenv("NOMAD_REGION"); v != "" {
config.Region = v
}
if v := os.Getenv("NOMAD_NAMESPACE"); v != "" {
config.Namespace = v
}
if auth := os.Getenv("NOMAD_HTTP_AUTH"); auth != "" {
var username, password string
if strings.Contains(auth, ":") {
split := strings.SplitN(auth, ":", 2)
username = split[0]
password = split[1]
} else {
username = auth
}
config.HttpAuth = &HttpBasicAuth{
Username: username,
Password: password,
}
}
// Read TLS specific env vars
if v := os.Getenv("NOMAD_CACERT"); v != "" {
config.TLSConfig.CACert = v
}
if v := os.Getenv("NOMAD_CAPATH"); v != "" {
config.TLSConfig.CAPath = v
}
if v := os.Getenv("NOMAD_CLIENT_CERT"); v != "" {
config.TLSConfig.ClientCert = v
}
if v := os.Getenv("NOMAD_CLIENT_KEY"); v != "" {
config.TLSConfig.ClientKey = v
}
if v := os.Getenv("NOMAD_TLS_SERVER_NAME"); v != "" {
config.TLSConfig.TLSServerName = v
}
if v := os.Getenv("NOMAD_SKIP_VERIFY"); v != "" {
if insecure, err := strconv.ParseBool(v); err == nil {
config.TLSConfig.Insecure = insecure
}
}
if v := os.Getenv("NOMAD_TOKEN"); v != "" {
config.SecretID = v
}
return config
}
// cloneWithTimeout returns a cloned httpClient with set timeout if positive;
// otherwise, returns the same client
func cloneWithTimeout(httpClient *http.Client, t time.Duration) (*http.Client, error) {
if httpClient == nil {
return nil, fmt.Errorf("nil HTTP client")
} else if httpClient.Transport == nil {
return nil, fmt.Errorf("nil HTTP client transport")
}
if t.Nanoseconds() < 0 {
return httpClient, nil
}
tr, ok := httpClient.Transport.(*http.Transport)
if !ok {
return nil, fmt.Errorf("unexpected HTTP transport: %T", httpClient.Transport)
}
// copy all public fields, to avoid copying transient state and locks
ntr := &http.Transport{
Proxy: tr.Proxy,
DialContext: tr.DialContext,
Dial: tr.Dial,
DialTLS: tr.DialTLS,
TLSClientConfig: tr.TLSClientConfig,
TLSHandshakeTimeout: tr.TLSHandshakeTimeout,
DisableKeepAlives: tr.DisableKeepAlives,
DisableCompression: tr.DisableCompression,
MaxIdleConns: tr.MaxIdleConns,
MaxIdleConnsPerHost: tr.MaxIdleConnsPerHost,
MaxConnsPerHost: tr.MaxConnsPerHost,
IdleConnTimeout: tr.IdleConnTimeout,
ResponseHeaderTimeout: tr.ResponseHeaderTimeout,
ExpectContinueTimeout: tr.ExpectContinueTimeout,
TLSNextProto: tr.TLSNextProto,
ProxyConnectHeader: tr.ProxyConnectHeader,
MaxResponseHeaderBytes: tr.MaxResponseHeaderBytes,
}
// apply timeout
ntr.DialContext = (&net.Dialer{
Timeout: t,
KeepAlive: 30 * time.Second,
}).DialContext
// clone http client with new transport
nc := *httpClient
nc.Transport = ntr
return &nc, nil
}
// ConfigureTLS applies a set of TLS configurations to the the HTTP client.
func ConfigureTLS(httpClient *http.Client, tlsConfig *TLSConfig) error {
if tlsConfig == nil {
return nil
}
if httpClient == nil {
return fmt.Errorf("config HTTP Client must be set")
}
var clientCert tls.Certificate
foundClientCert := false
if tlsConfig.ClientCert != "" || tlsConfig.ClientKey != "" {
if tlsConfig.ClientCert != "" && tlsConfig.ClientKey != "" {
var err error
clientCert, err = tls.LoadX509KeyPair(tlsConfig.ClientCert, tlsConfig.ClientKey)
if err != nil {
return err
}
foundClientCert = true
} else {
return fmt.Errorf("Both client cert and client key must be provided")
}
} else if len(tlsConfig.ClientCertPEM) != 0 || len(tlsConfig.ClientKeyPEM) != 0 {
if len(tlsConfig.ClientCertPEM) != 0 && len(tlsConfig.ClientKeyPEM) != 0 {
var err error
clientCert, err = tls.X509KeyPair(tlsConfig.ClientCertPEM, tlsConfig.ClientKeyPEM)
if err != nil {
return err
}
foundClientCert = true
} else {
return fmt.Errorf("Both client cert and client key must be provided")
}
}
clientTLSConfig := httpClient.Transport.(*http.Transport).TLSClientConfig
rootConfig := &rootcerts.Config{
CAFile: tlsConfig.CACert,
CAPath: tlsConfig.CAPath,
CACertificate: tlsConfig.CACertPEM,
}
if err := rootcerts.ConfigureTLS(clientTLSConfig, rootConfig); err != nil {
return err
}
clientTLSConfig.InsecureSkipVerify = tlsConfig.Insecure
if foundClientCert {
clientTLSConfig.Certificates = []tls.Certificate{clientCert}
}
if tlsConfig.TLSServerName != "" {
clientTLSConfig.ServerName = tlsConfig.TLSServerName
}
return nil
}
// Client provides a client to the Nomad API
type Client struct {
httpClient *http.Client
config Config
}
// NewClient returns a new client
func NewClient(config *Config) (*Client, error) {
// bootstrap the config
defConfig := DefaultConfig()
if config.Address == "" {
config.Address = defConfig.Address
} else if _, err := url.Parse(config.Address); err != nil {
return nil, fmt.Errorf("invalid address '%s': %v", config.Address, err)
}
httpClient := config.HttpClient
if httpClient == nil {
httpClient = defaultHttpClient()
if err := ConfigureTLS(httpClient, config.TLSConfig); err != nil {
return nil, err
}
}
client := &Client{
config: *config,
httpClient: httpClient,
}
return client, nil
}
// Address return the address of the Nomad agent
func (c *Client) Address() string {
return c.config.Address
}
// SetRegion sets the region to forward API requests to.
func (c *Client) SetRegion(region string) {
c.config.Region = region
}
// SetNamespace sets the namespace to forward API requests to.
func (c *Client) SetNamespace(namespace string) {
c.config.Namespace = namespace
}
// GetNodeClient returns a new Client that will dial the specified node. If the
// QueryOptions is set, its region will be used.
func (c *Client) GetNodeClient(nodeID string, q *QueryOptions) (*Client, error) {
return c.getNodeClientImpl(nodeID, -1, q, c.Nodes().Info)
}
// GetNodeClientWithTimeout returns a new Client that will dial the specified
// node using the specified timeout. If the QueryOptions is set, its region will
// be used.
func (c *Client) GetNodeClientWithTimeout(
nodeID string, timeout time.Duration, q *QueryOptions) (*Client, error) {
return c.getNodeClientImpl(nodeID, timeout, q, c.Nodes().Info)
}
// nodeLookup is the definition of a function used to lookup a node. This is
// largely used to mock the lookup in tests.
type nodeLookup func(nodeID string, q *QueryOptions) (*Node, *QueryMeta, error)
// getNodeClientImpl is the implementation of creating a API client for
// contacting a node. It takes a function to lookup the node such that it can be
// mocked during tests.
func (c *Client) getNodeClientImpl(nodeID string, timeout time.Duration, q *QueryOptions, lookup nodeLookup) (*Client, error) {
node, _, err := lookup(nodeID, q)
if err != nil {
return nil, err
}
if node.Status == "down" {
return nil, NodeDownErr
}
if node.HTTPAddr == "" {
return nil, fmt.Errorf("http addr of node %q (%s) is not advertised", node.Name, nodeID)
}
var region string
switch {
case q != nil && q.Region != "":
// Prefer the region set in the query parameter
region = q.Region
case c.config.Region != "":
// If the client is configured for a particular region use that
region = c.config.Region
default:
// No region information is given so use GlobalRegion as the default.
region = GlobalRegion
}
// Get an API client for the node
conf := c.config.ClientConfig(region, node.HTTPAddr, node.TLSEnabled)
// set timeout - preserve old behavior where errors are ignored and use untimed one
httpClient, err := cloneWithTimeout(c.httpClient, timeout)
// on error, fallback to using current http client
if err != nil {
httpClient = c.httpClient
}
conf.HttpClient = httpClient
return NewClient(conf)
}
// SetSecretID sets the ACL token secret for API requests.
func (c *Client) SetSecretID(secretID string) {
c.config.SecretID = secretID
}
// request is used to help build up a request
type request struct {
config *Config
method string
url *url.URL
params url.Values
token string
body io.Reader
obj interface{}
}
// setQueryOptions is used to annotate the request with
// additional query options
func (r *request) setQueryOptions(q *QueryOptions) {
if q == nil {
return
}
if q.Region != "" {
r.params.Set("region", q.Region)
}
if q.Namespace != "" {
r.params.Set("namespace", q.Namespace)
}
if q.AuthToken != "" {
r.token = q.AuthToken
}
if q.AllowStale {
r.params.Set("stale", "")
}
if q.WaitIndex != 0 {
r.params.Set("index", strconv.FormatUint(q.WaitIndex, 10))
}
if q.WaitTime != 0 {
r.params.Set("wait", durToMsec(q.WaitTime))
}
if q.Prefix != "" {
r.params.Set("prefix", q.Prefix)
}
for k, v := range q.Params {
r.params.Set(k, v)
}
}
// durToMsec converts a duration to a millisecond specified string
func durToMsec(dur time.Duration) string {
return fmt.Sprintf("%dms", dur/time.Millisecond)
}
// setWriteOptions is used to annotate the request with
// additional write options
func (r *request) setWriteOptions(q *WriteOptions) {
if q == nil {
return
}
if q.Region != "" {
r.params.Set("region", q.Region)
}
if q.Namespace != "" {
r.params.Set("namespace", q.Namespace)
}
if q.AuthToken != "" {
r.token = q.AuthToken
}
}
// toHTTP converts the request to an HTTP request
func (r *request) toHTTP() (*http.Request, error) {
// Encode the query parameters
r.url.RawQuery = r.params.Encode()
// Check if we should encode the body
if r.body == nil && r.obj != nil {
if b, err := encodeBody(r.obj); err != nil {
return nil, err
} else {
r.body = b
}
}
// Create the HTTP request
req, err := http.NewRequest(r.method, r.url.RequestURI(), r.body)
if err != nil {
return nil, err
}
// Optionally configure HTTP basic authentication
if r.url.User != nil {
username := r.url.User.Username()
password, _ := r.url.User.Password()
req.SetBasicAuth(username, password)
} else if r.config.HttpAuth != nil {
req.SetBasicAuth(r.config.HttpAuth.Username, r.config.HttpAuth.Password)
}
req.Header.Add("Accept-Encoding", "gzip")
if r.token != "" {
req.Header.Set("X-Nomad-Token", r.token)
}
req.URL.Host = r.url.Host
req.URL.Scheme = r.url.Scheme
req.Host = r.url.Host
return req, nil
}
// newRequest is used to create a new request
func (c *Client) newRequest(method, path string) (*request, error) {
base, _ := url.Parse(c.config.Address)
u, err := url.Parse(path)
if err != nil {
return nil, err
}
r := &request{
config: &c.config,
method: method,
url: &url.URL{
Scheme: base.Scheme,
User: base.User,
Host: base.Host,
Path: u.Path,
RawPath: u.RawPath,
},
params: make(map[string][]string),
}
if c.config.Region != "" {
r.params.Set("region", c.config.Region)
}
if c.config.Namespace != "" {
r.params.Set("namespace", c.config.Namespace)
}
if c.config.WaitTime != 0 {
r.params.Set("wait", durToMsec(r.config.WaitTime))
}
if c.config.SecretID != "" {
r.token = r.config.SecretID
}
// Add in the query parameters, if any
for key, values := range u.Query() {
for _, value := range values {
r.params.Add(key, value)
}
}
return r, nil
}
// multiCloser is to wrap a ReadCloser such that when close is called, multiple
// Closes occur.
type multiCloser struct {
reader io.Reader
inorderClose []io.Closer
}
func (m *multiCloser) Close() error {
for _, c := range m.inorderClose {
if err := c.Close(); err != nil {
return err
}
}
return nil
}
func (m *multiCloser) Read(p []byte) (int, error) {
return m.reader.Read(p)
}
// doRequest runs a request with our client
func (c *Client) doRequest(r *request) (time.Duration, *http.Response, error) {
req, err := r.toHTTP()
if err != nil {
return 0, nil, err
}
start := time.Now()
resp, err := c.httpClient.Do(req)
diff := time.Now().Sub(start)
// If the response is compressed, we swap the body's reader.
if resp != nil && resp.Header != nil {
var reader io.ReadCloser
switch resp.Header.Get("Content-Encoding") {
case "gzip":
greader, err := gzip.NewReader(resp.Body)
if err != nil {
return 0, nil, err
}
// The gzip reader doesn't close the wrapped reader so we use
// multiCloser.
reader = &multiCloser{
reader: greader,
inorderClose: []io.Closer{greader, resp.Body},
}
default:
reader = resp.Body
}
resp.Body = reader
}
return diff, resp, err
}
// rawQuery makes a GET request to the specified endpoint but returns just the
// response body.
func (c *Client) rawQuery(endpoint string, q *QueryOptions) (io.ReadCloser, error) {
r, err := c.newRequest("GET", endpoint)
if err != nil {
return nil, err
}
r.setQueryOptions(q)
_, resp, err := requireOK(c.doRequest(r))
if err != nil {
return nil, err
}
return resp.Body, nil
}
// websocket makes a websocket request to the specific endpoint
func (c *Client) websocket(endpoint string, q *QueryOptions) (*websocket.Conn, *http.Response, error) {
transport, ok := c.httpClient.Transport.(*http.Transport)
if !ok {
return nil, nil, fmt.Errorf("unsupported transport")
}
dialer := websocket.Dialer{
ReadBufferSize: 4096,
WriteBufferSize: 4096,
HandshakeTimeout: c.httpClient.Timeout,
// values to inherit from http client configuration
NetDial: transport.Dial,
NetDialContext: transport.DialContext,
Proxy: transport.Proxy,
TLSClientConfig: transport.TLSClientConfig,
}
// build request object for header and parameters
r, err := c.newRequest("GET", endpoint)
if err != nil {
return nil, nil, err
}
r.setQueryOptions(q)
rhttp, err := r.toHTTP()
if err != nil {
return nil, nil, err
}
// convert scheme
wsScheme := ""
switch rhttp.URL.Scheme {
case "http":
wsScheme = "ws"
case "https":
wsScheme = "wss"
default:
return nil, nil, fmt.Errorf("unsupported scheme: %v", rhttp.URL.Scheme)
}
rhttp.URL.Scheme = wsScheme
conn, resp, err := dialer.Dial(rhttp.URL.String(), rhttp.Header)
// check resp status code, as it's more informative than handshake error we get from ws library
if resp != nil && resp.StatusCode != 101 {
var buf bytes.Buffer
if resp.Header.Get("Content-Encoding") == "gzip" {
greader, err := gzip.NewReader(resp.Body)
if err != nil {
return nil, nil, fmt.Errorf("Unexpected response code: %d", resp.StatusCode)
}
io.Copy(&buf, greader)
} else {
io.Copy(&buf, resp.Body)
}
resp.Body.Close()
return nil, nil, fmt.Errorf("Unexpected response code: %d (%s)", resp.StatusCode, buf.Bytes())
}
return conn, resp, err
}
// query is used to do a GET request against an endpoint
// and deserialize the response into an interface using
// standard Nomad conventions.
func (c *Client) query(endpoint string, out interface{}, q *QueryOptions) (*QueryMeta, error) {
r, err := c.newRequest("GET", endpoint)
if err != nil {
return nil, err
}
r.setQueryOptions(q)
rtt, resp, err := requireOK(c.doRequest(r))
if err != nil {
return nil, err
}
defer resp.Body.Close()
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
if err := decodeBody(resp, out); err != nil {
return nil, err
}
return qm, nil
}
// putQuery is used to do a PUT request when doing a read against an endpoint
// and deserialize the response into an interface using standard Nomad
// conventions.
func (c *Client) putQuery(endpoint string, in, out interface{}, q *QueryOptions) (*QueryMeta, error) {
r, err := c.newRequest("PUT", endpoint)
if err != nil {
return nil, err
}
r.setQueryOptions(q)
r.obj = in
rtt, resp, err := requireOK(c.doRequest(r))
if err != nil {
return nil, err
}
defer resp.Body.Close()
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
if err := decodeBody(resp, out); err != nil {
return nil, err
}
return qm, nil
}
// write is used to do a PUT request against an endpoint
// and serialize/deserialized using the standard Nomad conventions.
func (c *Client) write(endpoint string, in, out interface{}, q *WriteOptions) (*WriteMeta, error) {
r, err := c.newRequest("PUT", endpoint)
if err != nil {
return nil, err
}
r.setWriteOptions(q)
r.obj = in
rtt, resp, err := requireOK(c.doRequest(r))
if err != nil {
return nil, err
}
defer resp.Body.Close()
wm := &WriteMeta{RequestTime: rtt}
parseWriteMeta(resp, wm)
if out != nil {
if err := decodeBody(resp, &out); err != nil {
return nil, err
}
}
return wm, nil
}
// delete is used to do a DELETE request against an endpoint
// and serialize/deserialized using the standard Nomad conventions.
func (c *Client) delete(endpoint string, out interface{}, q *WriteOptions) (*WriteMeta, error) {
r, err := c.newRequest("DELETE", endpoint)
if err != nil {
return nil, err
}
r.setWriteOptions(q)
rtt, resp, err := requireOK(c.doRequest(r))
if err != nil {
return nil, err
}
defer resp.Body.Close()
wm := &WriteMeta{RequestTime: rtt}
parseWriteMeta(resp, wm)
if out != nil {
if err := decodeBody(resp, &out); err != nil {
return nil, err
}
}
return wm, nil
}
// parseQueryMeta is used to help parse query meta-data
func parseQueryMeta(resp *http.Response, q *QueryMeta) error {
header := resp.Header
// Parse the X-Nomad-Index
index, err := strconv.ParseUint(header.Get("X-Nomad-Index"), 10, 64)
if err != nil {
return fmt.Errorf("Failed to parse X-Nomad-Index: %v", err)
}
q.LastIndex = index
// Parse the X-Nomad-LastContact
last, err := strconv.ParseUint(header.Get("X-Nomad-LastContact"), 10, 64)
if err != nil {
return fmt.Errorf("Failed to parse X-Nomad-LastContact: %v", err)
}
q.LastContact = time.Duration(last) * time.Millisecond
// Parse the X-Nomad-KnownLeader
switch header.Get("X-Nomad-KnownLeader") {
case "true":
q.KnownLeader = true
default:
q.KnownLeader = false
}
return nil
}
// parseWriteMeta is used to help parse write meta-data
func parseWriteMeta(resp *http.Response, q *WriteMeta) error {
header := resp.Header
// Parse the X-Nomad-Index
index, err := strconv.ParseUint(header.Get("X-Nomad-Index"), 10, 64)
if err != nil {
return fmt.Errorf("Failed to parse X-Nomad-Index: %v", err)
}
q.LastIndex = index
return nil
}
// decodeBody is used to JSON decode a body
func decodeBody(resp *http.Response, out interface{}) error {
switch resp.ContentLength {
case 0:
if out == nil {
return nil
}
return errors.New("Got 0 byte response with non-nil decode object")
default:
dec := json.NewDecoder(resp.Body)
return dec.Decode(out)
}
}
// encodeBody is used to encode a request body
func encodeBody(obj interface{}) (io.Reader, error) {
buf := bytes.NewBuffer(nil)
enc := json.NewEncoder(buf)
if err := enc.Encode(obj); err != nil {
return nil, err
}
return buf, nil
}
// requireOK is used to wrap doRequest and check for a 200
func requireOK(d time.Duration, resp *http.Response, e error) (time.Duration, *http.Response, error) {
if e != nil {
if resp != nil {
resp.Body.Close()
}
return d, nil, e
}
if resp.StatusCode != 200 {
var buf bytes.Buffer
io.Copy(&buf, resp.Body)
resp.Body.Close()
return d, nil, fmt.Errorf("Unexpected response code: %d (%s)", resp.StatusCode, buf.Bytes())
}
return d, resp, nil
}