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28 lines
1.1 KiB
Markdown
28 lines
1.1 KiB
Markdown
# Content-script
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this script is intended to inject the `ethereum provider` into dapp's page.
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Although `content-script` share the same dom with `dapp`, but the context is different.
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`content-script` will inject the `provider` with a inline script element at `document_start`.
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`content-script` also generate a random value as the `broadcastChannel`(_broadcastChannelMessage.ts_) name, to establish channel between `content-script` and `ethereum provider`.
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## message pass
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### from dapp
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when dapp use the provider function, like `ethereum.request`, the `provider` will send a message to `content-script` with `broadcastChannel`.
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### to background
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the `content-script` will connect `background` in the start through `runtime.connect()`.(_portMessage.ts_)
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after `content-script` receive the message from dapp, it will send the message to background, using the `runtime channel`.
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in a nutshell, the extension can only handle **one** request at the same time for each page. before the request solved, other requests are queued to send.
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## request queue
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the request will be queued in the `provider` when dapp page's `visibility === hidden`.
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