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107 lines
4.5 KiB
Go
Vendored
107 lines
4.5 KiB
Go
Vendored
package couchbase
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/*
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The goal here is to map a hostname:port combination to another hostname:port
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combination. The original hostname:port gives the name and regular KV port
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of a couchbase server. We want to determine the corresponding SSL KV port.
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To do this, we have a pool services structure, as obtained from
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the /pools/default/nodeServices API.
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For a fully configured two-node system, the structure may look like this:
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{"rev":32,"nodesExt":[
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{"services":{"mgmt":8091,"mgmtSSL":18091,"fts":8094,"ftsSSL":18094,"indexAdmin":9100,"indexScan":9101,"indexHttp":9102,"indexStreamInit":9103,"indexStreamCatchup":9104,"indexStreamMaint":9105,"indexHttps":19102,"capiSSL":18092,"capi":8092,"kvSSL":11207,"projector":9999,"kv":11210,"moxi":11211},"hostname":"172.23.123.101"},
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{"services":{"mgmt":8091,"mgmtSSL":18091,"indexAdmin":9100,"indexScan":9101,"indexHttp":9102,"indexStreamInit":9103,"indexStreamCatchup":9104,"indexStreamMaint":9105,"indexHttps":19102,"capiSSL":18092,"capi":8092,"kvSSL":11207,"projector":9999,"kv":11210,"moxi":11211,"n1ql":8093,"n1qlSSL":18093},"thisNode":true,"hostname":"172.23.123.102"}]}
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In this case, note the "hostname" fields, and the "kv" and "kvSSL" fields.
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For a single-node system, perhaps brought up for testing, the structure may look like this:
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{"rev":66,"nodesExt":[
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{"services":{"mgmt":8091,"mgmtSSL":18091,"indexAdmin":9100,"indexScan":9101,"indexHttp":9102,"indexStreamInit":9103,"indexStreamCatchup":9104,"indexStreamMaint":9105,"indexHttps":19102,"kv":11210,"kvSSL":11207,"capi":8092,"capiSSL":18092,"projector":9999,"n1ql":8093,"n1qlSSL":18093},"thisNode":true}],"clusterCapabilitiesVer":[1,0],"clusterCapabilities":{"n1ql":["enhancedPreparedStatements"]}}
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Here, note that there is only a single entry in the "nodeExt" array and that it does not have a "hostname" field.
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We will assume that either hostname fields are present, or there is only a single node.
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*/
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import (
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"encoding/json"
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"fmt"
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"net"
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"strconv"
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)
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func ParsePoolServices(jsonInput string) (*PoolServices, error) {
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ps := &PoolServices{}
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err := json.Unmarshal([]byte(jsonInput), ps)
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return ps, err
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}
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// Accepts a "host:port" string representing the KV TCP port and the pools
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// nodeServices payload and returns a host:port string representing the KV
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// TLS port on the same node as the KV TCP port.
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// Returns the original host:port if in case of local communication (services
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// on the same node as source)
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func MapKVtoSSL(hostport string, ps *PoolServices) (string, bool, error) {
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return MapKVtoSSLExt(hostport, ps, false)
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}
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func MapKVtoSSLExt(hostport string, ps *PoolServices, force bool) (string, bool, error) {
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host, port, err := net.SplitHostPort(hostport)
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if err != nil {
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return "", false, fmt.Errorf("Unable to split hostport %s: %v", hostport, err)
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}
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portInt, err := strconv.Atoi(port)
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if err != nil {
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return "", false, fmt.Errorf("Unable to parse host/port combination %s: %v", hostport, err)
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}
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var ns *NodeServices
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for i := range ps.NodesExt {
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hostname := ps.NodesExt[i].Hostname
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if len(hostname) != 0 && hostname != host {
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/* If the hostname is the empty string, it means the node (and by extension
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the cluster) is configured on the loopback. Further, it means that the client
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should use whatever hostname it used to get the nodeServices information in
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the first place to access the cluster. Thus, when the hostname is empty in
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the nodeService entry we can assume that client will use the hostname it used
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to access the KV TCP endpoint - and thus that it automatically "matches".
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If hostname is not empty and doesn't match then we move to the next entry.
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*/
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continue
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}
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kvPort, found := ps.NodesExt[i].Services["kv"]
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if !found {
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/* not a node with a KV service */
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continue
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}
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if kvPort == portInt {
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ns = &(ps.NodesExt[i])
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break
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}
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}
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if ns == nil {
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return "", false, fmt.Errorf("Unable to parse host/port combination %s: no matching node found among %d", hostport, len(ps.NodesExt))
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}
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kvSSL, found := ns.Services["kvSSL"]
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if !found {
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return "", false, fmt.Errorf("Unable to map host/port combination %s: target host has no kvSSL port listed", hostport)
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}
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//Don't encrypt for communication between local nodes
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if !force && (len(ns.Hostname) == 0 || ns.ThisNode) {
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return hostport, false, nil
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}
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ip := net.ParseIP(host)
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if ip != nil && ip.To4() == nil && ip.To16() != nil { // IPv6 and not a FQDN
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// Prefix and suffix square brackets as SplitHostPort removes them,
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// see: https://golang.org/pkg/net/#SplitHostPort
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host = "[" + host + "]"
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}
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return fmt.Sprintf("%s:%d", host, kvSSL), true, nil
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}
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