250 lines
8.3 KiB
Markdown
250 lines
8.3 KiB
Markdown
# triton-go
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`triton-go` is a client SDK for Go applications using Joyent's Triton Compute
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and Object Storage (Manta) APIs.
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[](https://travis-ci.org/joyent/triton-go) [](https://goreportcard.com/report/github.com/joyent/triton-go)
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The Triton Go SDK is used in the following open source projects.
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- [Consul](https://www.consul.io/docs/agent/cloud-auto-join.html#joyent-triton)
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- [Packer](http://github.com/hashicorp/packer)
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- [Vault](http://github.com/hashicorp/vault)
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- [Terraform](http://github.com/hashicorp/terraform)
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- [Terraform Triton Provider](https://github.com/terraform-providers/terraform-provider-triton)
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- [Docker Machine](https://github.com/joyent/docker-machine-driver-triton)
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- [Triton Kubernetes](https://github.com/joyent/triton-kubernetes)
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- [HashiCorp go-discover](https://github.com/hashicorp/go-discover)
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## Usage
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Triton uses [HTTP Signature][4] to sign the Date header in each HTTP request
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made to the Triton API. Currently, requests can be signed using either a private
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key file loaded from disk (using an [`authentication.PrivateKeySigner`][5]), or
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using a key stored with the local SSH Agent (using an [`SSHAgentSigner`][6].
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To construct a Signer, use the `New*` range of methods in the `authentication`
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package. In the case of `authentication.NewSSHAgentSigner`, the parameters are
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the fingerprint of the key with which to sign, and the account name (normally
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stored in the `TRITON_ACCOUNT` environment variable). There is also support for
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passing in a username, this will allow you to use an account other than the main
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Triton account. For example:
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```go
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input := authentication.SSHAgentSignerInput{
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KeyID: "a4:c6:f3:75:80:27:e0:03:a9:98:79:ef:c5:0a:06:11",
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AccountName: "AccountName",
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Username: "Username",
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}
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sshKeySigner, err := authentication.NewSSHAgentSigner(input)
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if err != nil {
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log.Fatalf("NewSSHAgentSigner: %s", err)
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}
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```
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An appropriate key fingerprint can be generated using `ssh-keygen`.
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```
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ssh-keygen -Emd5 -lf ~/.ssh/id_rsa.pub | cut -d " " -f 2 | sed 's/MD5://'
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```
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Each top level package, `account`, `compute`, `identity`, `network`, all have
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their own separate client. In order to initialize a package client, simply pass
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the global `triton.ClientConfig` struct into the client's constructor function.
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```go
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config := &triton.ClientConfig{
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TritonURL: os.Getenv("TRITON_URL"),
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MantaURL: os.Getenv("MANTA_URL"),
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AccountName: accountName,
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Username: os.Getenv("TRITON_USER"),
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Signers: []authentication.Signer{sshKeySigner},
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}
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c, err := compute.NewClient(config)
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if err != nil {
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log.Fatalf("compute.NewClient: %s", err)
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}
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```
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Constructing `compute.Client` returns an interface which exposes `compute` API
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resources. The same goes for all other packages. Reference their unique
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documentation for more information.
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The same `triton.ClientConfig` will initialize the Manta `storage` client as
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well...
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```go
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c, err := storage.NewClient(config)
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if err != nil {
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log.Fatalf("storage.NewClient: %s", err)
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}
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```
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## Error Handling
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If an error is returned by the HTTP API, the `error` returned from the function
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will contain an instance of `errors.APIError` in the chain. Error wrapping
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is performed using the [pkg/errors][7] library.
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## Acceptance Tests
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Acceptance Tests run directly against the Triton API, so you will need either a
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local installation of Triton or an account with Joyent's Public Cloud offering
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in order to run them. The tests create real resources (and thus cost real
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money)!
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In order to run acceptance tests, the following environment variables must be
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set:
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- `TRITON_TEST` - must be set to any value in order to indicate desire to create
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resources
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- `TRITON_URL` - the base endpoint for the Triton API
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- `TRITON_ACCOUNT` - the account name for the Triton API
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- `TRITON_KEY_ID` - the fingerprint of the SSH key identifying the key
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Additionally, you may set `TRITON_KEY_MATERIAL` to the contents of an unencrypted
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private key. If this is set, the PrivateKeySigner (see above) will be used - if
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not the SSHAgentSigner will be used. You can also set `TRITON_USER` to run the tests
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against an account other than the main Triton account
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### Example Run
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The verbose output has been removed for brevity here.
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```
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$ HTTP_PROXY=http://localhost:8888 \
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TRITON_TEST=1 \
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TRITON_URL=https://us-sw-1.api.joyent.com \
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TRITON_ACCOUNT=AccountName \
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TRITON_KEY_ID=a4:c6:f3:75:80:27:e0:03:a9:98:79:ef:c5:0a:06:11 \
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go test -v -run "TestAccKey"
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=== RUN TestAccKey_Create
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--- PASS: TestAccKey_Create (12.46s)
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=== RUN TestAccKey_Get
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--- PASS: TestAccKey_Get (4.30s)
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=== RUN TestAccKey_Delete
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--- PASS: TestAccKey_Delete (15.08s)
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PASS
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ok github.com/joyent/triton-go 31.861s
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```
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## Example API
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There's an `examples/` directory available with sample code setup for many of
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the APIs within this library. Most of these can be run using `go run` and
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referencing your SSH key file use by your active `triton` CLI profile.
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```sh
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$ eval "$(triton env us-sw-1)"
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$ TRITON_KEY_FILE=~/.ssh/triton-id_rsa go run examples/compute/instances.go
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```
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The following is a complete example of how to initialize the `compute` package
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client and list all instances under an account. More detailed usage of this
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library follows.
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```go
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package main
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import (
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"context"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"time"
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triton "github.com/joyent/triton-go"
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"github.com/joyent/triton-go/authentication"
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"github.com/joyent/triton-go/compute"
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)
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func main() {
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keyID := os.Getenv("TRITON_KEY_ID")
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accountName := os.Getenv("TRITON_ACCOUNT")
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keyMaterial := os.Getenv("TRITON_KEY_MATERIAL")
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userName := os.Getenv("TRITON_USER")
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var signer authentication.Signer
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var err error
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if keyMaterial == "" {
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input := authentication.SSHAgentSignerInput{
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KeyID: keyID,
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AccountName: accountName,
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Username: userName,
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}
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signer, err = authentication.NewSSHAgentSigner(input)
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if err != nil {
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log.Fatalf("Error Creating SSH Agent Signer: {{err}}", err)
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}
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} else {
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var keyBytes []byte
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if _, err = os.Stat(keyMaterial); err == nil {
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keyBytes, err = ioutil.ReadFile(keyMaterial)
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if err != nil {
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log.Fatalf("Error reading key material from %s: %s",
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keyMaterial, err)
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}
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block, _ := pem.Decode(keyBytes)
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if block == nil {
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log.Fatalf(
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"Failed to read key material '%s': no key found", keyMaterial)
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}
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if block.Headers["Proc-Type"] == "4,ENCRYPTED" {
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log.Fatalf(
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"Failed to read key '%s': password protected keys are\n"+
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"not currently supported. Please decrypt the key prior to use.", keyMaterial)
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}
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} else {
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keyBytes = []byte(keyMaterial)
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}
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input := authentication.PrivateKeySignerInput{
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KeyID: keyID,
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PrivateKeyMaterial: keyBytes,
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AccountName: accountName,
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Username: userName,
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}
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signer, err = authentication.NewPrivateKeySigner(input)
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if err != nil {
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log.Fatalf("Error Creating SSH Private Key Signer: {{err}}", err)
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}
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}
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config := &triton.ClientConfig{
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TritonURL: os.Getenv("TRITON_URL"),
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AccountName: accountName,
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Username: userName,
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Signers: []authentication.Signer{signer},
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}
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c, err := compute.NewClient(config)
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if err != nil {
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log.Fatalf("compute.NewClient: %s", err)
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}
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listInput := &compute.ListInstancesInput{}
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instances, err := c.Instances().List(context.Background(), listInput)
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if err != nil {
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log.Fatalf("compute.Instances.List: %v", err)
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}
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numInstances := 0
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for _, instance := range instances {
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numInstances++
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fmt.Println(fmt.Sprintf("-- Instance: %v", instance.Name))
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}
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}
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```
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[4]: https://github.com/joyent/node-http-signature/blob/master/http_signing.md
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[5]: https://godoc.org/github.com/joyent/triton-go/authentication
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[6]: https://godoc.org/github.com/joyent/triton-go/authentication
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[7]: https://github.com/pkg/errors
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