open-consul/api/connect_intention.go

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package api
import (
"bytes"
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"fmt"
"io"
"time"
)
// Intention defines an intention for the Connect Service Graph. This defines
// the allowed or denied behavior of a connection between two services using
// Connect.
type Intention struct {
// ID is the UUID-based ID for the intention, always generated by Consul.
ID string
// Description is a human-friendly description of this intention.
// It is opaque to Consul and is only stored and transferred in API
// requests.
Description string
// SourceNS, SourceName are the namespace and name, respectively, of
// the source service. Either of these may be the wildcard "*", but only
// the full value can be a wildcard. Partial wildcards are not allowed.
// The source may also be a non-Consul service, as specified by SourceType.
//
// DestinationNS, DestinationName is the same, but for the destination
// service. The same rules apply. The destination is always a Consul
// service.
SourceNS, SourceName string
DestinationNS, DestinationName string
// SourceType is the type of the value for the source.
SourceType IntentionSourceType
// Action is whether this is a whitelist or blacklist intention.
Action IntentionAction
// DefaultAddr, DefaultPort of the local listening proxy (if any) to
// make this connection.
DefaultAddr string
DefaultPort int
// Meta is arbitrary metadata associated with the intention. This is
// opaque to Consul but is served in API responses.
Meta map[string]string
// Precedence is the order that the intention will be applied, with
// larger numbers being applied first. This is a read-only field, on
// any intention update it is updated.
Precedence int
// CreatedAt and UpdatedAt keep track of when this record was created
// or modified.
CreatedAt, UpdatedAt time.Time
// Hash of the contents of the intention
//
// This is needed mainly for replication purposes. When replicating from
// one DC to another keeping the content Hash will allow us to detect
// content changes more efficiently than checking every single field
Hash []byte
CreateIndex uint64
ModifyIndex uint64
}
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// String returns human-friendly output describing ths intention.
func (i *Intention) String() string {
return fmt.Sprintf("%s => %s (%s)",
i.SourceString(),
i.DestinationString(),
i.Action)
}
// SourceString returns the namespace/name format for the source, or
// just "name" if the namespace is the default namespace.
func (i *Intention) SourceString() string {
return i.partString(i.SourceNS, i.SourceName)
}
// DestinationString returns the namespace/name format for the source, or
// just "name" if the namespace is the default namespace.
func (i *Intention) DestinationString() string {
return i.partString(i.DestinationNS, i.DestinationName)
}
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func (i *Intention) partString(ns, n string) string {
// For now we omit the default namespace from the output. In the future
// we might want to look at this and show this in a multi-namespace world.
if ns != "" && ns != IntentionDefaultNamespace {
n = ns + "/" + n
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}
return n
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}
// IntentionDefaultNamespace is the default namespace value.
const IntentionDefaultNamespace = "default"
// IntentionAction is the action that the intention represents. This
// can be "allow" or "deny" to whitelist or blacklist intentions.
type IntentionAction string
const (
IntentionActionAllow IntentionAction = "allow"
IntentionActionDeny IntentionAction = "deny"
)
// IntentionSourceType is the type of the source within an intention.
type IntentionSourceType string
const (
// IntentionSourceConsul is a service within the Consul catalog.
IntentionSourceConsul IntentionSourceType = "consul"
)
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// IntentionMatch are the arguments for the intention match API.
type IntentionMatch struct {
By IntentionMatchType
Names []string
}
// IntentionMatchType is the target for a match request. For example,
// matching by source will look for all intentions that match the given
// source value.
type IntentionMatchType string
const (
IntentionMatchSource IntentionMatchType = "source"
IntentionMatchDestination IntentionMatchType = "destination"
)
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// IntentionCheck are the arguments for the intention check API. For
// more documentation see the IntentionCheck function.
type IntentionCheck struct {
// Source and Destination are the source and destination values to
// check. The destination is always a Consul service, but the source
// may be other values as defined by the SourceType.
Source, Destination string
// SourceType is the type of the value for the source.
SourceType IntentionSourceType
}
// Intentions returns the list of intentions.
func (h *Connect) Intentions(q *QueryOptions) ([]*Intention, *QueryMeta, error) {
r := h.c.newRequest("GET", "/v1/connect/intentions")
r.setQueryOptions(q)
rtt, resp, err := requireOK(h.c.doRequest(r))
if err != nil {
return nil, nil, err
}
defer resp.Body.Close()
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
var out []*Intention
if err := decodeBody(resp, &out); err != nil {
return nil, nil, err
}
return out, qm, nil
}
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// IntentionGet retrieves a single intention.
func (h *Connect) IntentionGet(id string, q *QueryOptions) (*Intention, *QueryMeta, error) {
r := h.c.newRequest("GET", "/v1/connect/intentions/"+id)
r.setQueryOptions(q)
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rtt, resp, err := h.c.doRequest(r)
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if err != nil {
return nil, nil, err
}
defer resp.Body.Close()
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
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if resp.StatusCode == 404 {
return nil, qm, nil
} else if resp.StatusCode != 200 {
var buf bytes.Buffer
io.Copy(&buf, resp.Body)
return nil, nil, fmt.Errorf(
"Unexpected response %d: %s", resp.StatusCode, buf.String())
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}
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var out Intention
if err := decodeBody(resp, &out); err != nil {
return nil, nil, err
}
return &out, qm, nil
}
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// IntentionDelete deletes a single intention.
func (h *Connect) IntentionDelete(id string, q *WriteOptions) (*WriteMeta, error) {
r := h.c.newRequest("DELETE", "/v1/connect/intentions/"+id)
r.setWriteOptions(q)
rtt, resp, err := requireOK(h.c.doRequest(r))
if err != nil {
return nil, err
}
defer resp.Body.Close()
qm := &WriteMeta{}
qm.RequestTime = rtt
return qm, nil
}
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// IntentionMatch returns the list of intentions that match a given source
// or destination. The returned intentions are ordered by precedence where
// result[0] is the highest precedence (if that matches, then that rule overrides
// all other rules).
//
// Matching can be done for multiple names at the same time. The resulting
// map is keyed by the given names. Casing is preserved.
func (h *Connect) IntentionMatch(args *IntentionMatch, q *QueryOptions) (map[string][]*Intention, *QueryMeta, error) {
r := h.c.newRequest("GET", "/v1/connect/intentions/match")
r.setQueryOptions(q)
r.params.Set("by", string(args.By))
for _, name := range args.Names {
r.params.Add("name", name)
}
rtt, resp, err := requireOK(h.c.doRequest(r))
if err != nil {
return nil, nil, err
}
defer resp.Body.Close()
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
var out map[string][]*Intention
if err := decodeBody(resp, &out); err != nil {
return nil, nil, err
}
return out, qm, nil
}
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// IntentionCheck returns whether a given source/destination would be allowed
// or not given the current set of intentions and the configuration of Consul.
func (h *Connect) IntentionCheck(args *IntentionCheck, q *QueryOptions) (bool, *QueryMeta, error) {
r := h.c.newRequest("GET", "/v1/connect/intentions/check")
r.setQueryOptions(q)
r.params.Set("source", args.Source)
r.params.Set("destination", args.Destination)
if args.SourceType != "" {
r.params.Set("source-type", string(args.SourceType))
}
rtt, resp, err := requireOK(h.c.doRequest(r))
if err != nil {
return false, nil, err
}
defer resp.Body.Close()
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
var out struct{ Allowed bool }
if err := decodeBody(resp, &out); err != nil {
return false, nil, err
}
return out.Allowed, qm, nil
}
// IntentionCreate will create a new intention. The ID in the given
// structure must be empty and a generate ID will be returned on
// success.
func (c *Connect) IntentionCreate(ixn *Intention, q *WriteOptions) (string, *WriteMeta, error) {
r := c.c.newRequest("POST", "/v1/connect/intentions")
r.setWriteOptions(q)
r.obj = ixn
rtt, resp, err := requireOK(c.c.doRequest(r))
if err != nil {
return "", nil, err
}
defer resp.Body.Close()
wm := &WriteMeta{}
wm.RequestTime = rtt
var out struct{ ID string }
if err := decodeBody(resp, &out); err != nil {
return "", nil, err
}
return out.ID, wm, nil
}
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// IntentionUpdate will update an existing intention. The ID in the given
// structure must be non-empty.
func (c *Connect) IntentionUpdate(ixn *Intention, q *WriteOptions) (*WriteMeta, error) {
r := c.c.newRequest("PUT", "/v1/connect/intentions/"+ixn.ID)
r.setWriteOptions(q)
r.obj = ixn
rtt, resp, err := requireOK(c.c.doRequest(r))
if err != nil {
return nil, err
}
defer resp.Body.Close()
wm := &WriteMeta{}
wm.RequestTime = rtt
return wm, nil
}