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+package gerritevents
+
+// These types are taken from https://cl.tvl.fyi/Documentation/json.html.
+
+// Account is a Gerrit account (or just a Git name+email pair).
+type Account struct {
+	Name     string `json:"name"`
+	Email    string `json:"email"`
+	Username string `json:"username"`
+}
+
+// ChangeStatus represents the states a change can be in.
+type ChangeStatus string
+
+const (
+	// ChangeStatusNew is the state a change is in during review.
+	ChangeStatusNew ChangeStatus = "NEW"
+
+	// ChangeStatusMerged indicates a change was merged to the target branch.
+	ChangeStatusMerged ChangeStatus = "MERGED"
+
+	// ChangeStatusAbandoned indicates a change was marked as abandoned.
+	ChangeStatusAbandoned ChangeStatus = "ABANDONED"
+)
+
+// Message is a message left by a reviewer.
+type Message struct {
+	Timestamp Time    `json:"timestamp"`
+	Reviewer  Account `json:"reviewer"`
+	Message   string  `json:"message"`
+}
+
+// TrackingID allows storing identifiers from external systems, i.e. bug trackers.
+type TrackingID struct {
+	System string `json:"system"`
+	ID     string `json:"id"`
+}
+
+// ChangeKind indicates the different changes that can be made to a change.
+type ChangeKind string
+
+const (
+	// ChangeKindRework indicates a non-trivial content change.
+	ChangeKindRework ChangeKind = "REWORK"
+
+	// ChangeKindTrivialRebase indicates a conflict-free merge between the new parent and the prior patch set.
+	ChangeKindTrivialRebase ChangeKind = "TRIVIAL_REBASE"
+
+	// ChangeKindMergeFirstParentUpdate indicates a conflict-free change of the first parent of a merge commit.
+	ChangeKindMergeFirstParentUpdate ChangeKind = "MERGE_FIRST_PARENT_UPDATE"
+
+	// ChangeKindNoCodeChange indicates no code change (the tree and parent trees are unchanged) - commit message probably changed.
+	ChangeKindNoCodeChange ChangeKind = "NO_CODE_CHANGE"
+
+	// ChangeKindNoChange indicates nothing changes: the commit message, tree, and parent tree are unchanged.
+	ChangeKindNoChange ChangeKind = "NO_CHANGE"
+)
+
+// Approval represents the current and past state of an approval label.
+type Approval struct {
+	Type        string   `json:"type"`
+	Description string   `json:"description"`
+	Value       string   `json:"value"`
+	OldValue    *string  `json:"oldValue"`
+	GrantedOn   *Time    `json:"grantedOn"`
+	By          *Account `json:"by"`
+}
+
+// PatchSetComment is a single comment left on a patchset.
+type PatchSetComment struct {
+	File     string  `json:"file"`
+	Line     int     `json:"line"`
+	Reviewer Account `json:"reviewer"`
+	Message  string  `json:"message"`
+}
+
+// FilePatchType represents the different modifications that can be made to a file by a patchset.
+type FilePatchType string
+
+const (
+	// FilePatchTypeAdded indicates the file did not exist, and this patchset adds it to the tree.
+	FilePatchTypeAdded FilePatchType = "ADDED"
+
+	// FilePatchTypeModified indicates the file exists before and after this patchset.
+	FilePatchTypeModified FilePatchType = "MODIFIED"
+
+	// FilePatchTypeDeleted indicates the file is removed by this patchset.
+	FilePatchTypeDeleted FilePatchType = "DELETED"
+
+	// FilePatchTypeRenamed indicates the file has a different name before this patchset than after.
+	FilePatchTypeRenamed FilePatchType = "RENAMED"
+
+	// FilePatchTypeCopied indicates the file was copied from a different file.
+	FilePatchTypeCopied FilePatchType = "COPIED"
+
+	// FilePatchTypeRewrite indicates the file had a significant quantity of content changed.
+	FilePatchTypeRewrite FilePatchType = "REWRITE"
+)
+
+// File represents a file in a patchset as well as how it is being modified.
+type File struct {
+	File    string        `json:"file"`
+	FileOld string        `json:"fileOld"`
+	Type    FilePatchType `json:"type"`
+}
+
+// PatchSet represents a single patchset within a change.
+type PatchSet struct {
+	Number         int               `json:"number"`
+	Revision       string            `json:"revision"`
+	Parents        []string          `json:"parents"`
+	Ref            string            `json:"ref"`
+	Uploader       Account           `json:"uploader"`
+	Author         Account           `json:"author"`
+	CreatedOn      Time              `json:"createdOn"`
+	Kind           ChangeKind        `json:"kind"`
+	Approvals      []Approval        `json:"approvals"`
+	Comments       []PatchSetComment `json:"comments"`
+	Files          []File            `json:"file"`
+	SizeInsertions int               `json:"sizeInsertions"`
+	SizeDeletions  int               `json:"sizeDeletions"`
+}
+
+// Dependency represents a change on which this change is dependent.
+type Dependency struct {
+	ID                string `json:"id"`
+	Number            int    `json:"number"`
+	Revision          string `json:"revision"`
+	Ref               string `json:"ref"`
+	IsCurrentPatchSet bool   `json:"isCurrentPatchSet"`
+}
+
+// SubmitStatus indicates whether this change has met the submit conditions and is ready to submit.
+type SubmitStatus string
+
+const (
+	// SubmitStatusOK indicates this change is ready to submit - all submit requirements are met.
+	SubmitStatusOK SubmitStatus = "OK"
+
+	// SubmitStatusNotReady indicates this change cannot yet be submitted.
+	SubmitStatusNotReady SubmitStatus = "NOT_READY"
+
+	// SubmitStatusRuleError indicates the submit rules could not be evaluted. Administrator intervention is required.
+	SubmitStatusRuleError SubmitStatus = "RULE_ERROR"
+)
+
+// LabelStatus indicates whether this label permits submission and if the label can be granted by anyone.
+type LabelStatus string
+
+const (
+	// LabelStatusOK indicates that this label provides what is necessary for submission (e.g. CR+2).
+	LabelStatusOK LabelStatus = "OK"
+
+	// LabelStatusReject indicates this label prevents submission (e.g. CR-2).
+	LabelStatusReject LabelStatus = "REJECT"
+
+	// LabelStatusNeed indicates this label is required for submission, but has not been satisfied (e.g. CR0).
+	LabelStatusNeed LabelStatus = "NEED"
+
+	// LabelStatusMay indicates this label is not required for submission. It may or may not be set.
+	LabelStatusMay LabelStatus = "MAY"
+
+	// LabelStatusImpossible indicates this label is required for submission, but cannot be satisfied. The ACLs on this label may be set incorrectly.
+	LabelStatusImpossible LabelStatus = "IMPOSSIBLE"
+)
+
+// Label represents the status of a particular label.
+type Label struct {
+	Label  string      `json:"label"`
+	Status LabelStatus `json:"status"`
+	By     Account     `json:"by"`
+}
+
+// Requirement represents a submit requirement.
+type Requirement struct {
+	FallbackText string `json:"fallbackText"`
+	Type         string `json:"type"`
+	// TODO(lukegb): data
+}
+
+// SubmitRecord represents the current submission state of a change.
+type SubmitRecord struct {
+	Status       SubmitStatus  `json:"status"`
+	Labels       []Label       `json:"labels"`
+	Requirements []Requirement `json:"requirements"`
+}
+
+// Change represents a Gerrit CL.
+type Change struct {
+	Project         string         `json:"project"`
+	Branch          string         `json:"branch"`
+	Topic           string         `json:"topic"`
+	ID              string         `json:"id"`
+	Number          int            `json:"number"`
+	Subject         string         `json:"subject"`
+	Owner           Account        `json:"owner"`
+	URL             string         `json:"url"`
+	CommitMessage   string         `json:"commitMessage"`
+	CreatedOn       Time           `json:"createdOn"`
+	LastUpdated     *Time          `json:"lastUpdated"`
+	Open            bool           `json:"open"`
+	Status          ChangeStatus   `json:"status"`
+	Private         bool           `json:"private"`
+	WIP             bool           `json:"wip"`
+	Comments        []Message      `json:"comments"`
+	TrackingIDs     []TrackingID   `json:"trackingIds"`
+	CurrentPatchSet *PatchSet      `json:"currentPatchSet"`
+	PatchSets       []PatchSet     `json:"patchSets"`
+	DependsOn       []Dependency   `json:"dependsOn"`
+	NeededBy        []Dependency   `json:"neededBy"`
+	SubmitRecords   []SubmitRecord `json:"submitRecord"`
+	AllReviewers    []Account      `json:"allReviewers"`
+}
+
+// RefUpdate represents a change in a ref.
+type RefUpdate struct {
+	OldRev  string `json:"oldRev"`
+	NewRev  string `json:"newRev"`
+	RefName string `json:"refName"`
+	Project string `json:"project"`
+}